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Wang H, Ma W, Jin M, Li B, Sun S. Value of catecholamine levels in the differential diagnosis of vasovagal syncope and psychogenic pseudosyncope in children. Front Pediatr 2024; 12:1281196. [PMID: 38884104 PMCID: PMC11176470 DOI: 10.3389/fped.2024.1281196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 05/20/2024] [Indexed: 06/18/2024] Open
Abstract
Background and purpose Vasovagal syncope (VVS) and psychogenic pseudosyncope (PPS) can be difficult to distinguish, given their similar clinical presentations. This study was conducted to explore the clinical value of catecholamine levels in the differential diagnosis of VVS and PPS in children. Methods This retrospective case-control study was conducted with data from children with VVS and PPS who underwent head-up tilt tests (HUTTs) at the Children's Hospital of Hebei Province between March 2021 and March 2023. The data collected were baseline clinical characteristics, HUTT results, serum catecholamine levels in the supine and upright positions, and 24 h urinary catecholamine concentrations. These variables were compared between the VVS and PPS groups. Results From 328 potentially eligible cases, 54 (16.46%) cases of VVS and 24 (7.32%) cases of PPS were included in the analysis. No significant difference in age, sex, body mass index, or syncope frequency was observed between the VVS and PPS groups. The main predisposing factors for syncope were body position changes in the VSS group (83.33%) and emotional changes in the PPS group (41.67%). The episode duration was significantly shorter in the VSS group than in the PPS group (4.01 ± 1.20 vs. 24.06 ± 5.56 min, p < 0.05). The recovery time was also shorter in the VVS group than in the PPS group (1.91 ± 0.85 vs. 8.62 ± 2.55 min, p < 0.05). Relative to patients with PPS, those with VVS had significantly higher serum epinephrine (EP) levels in the upright position [199.35 (102.88, 575.00) vs. 147.40 (103.55, 227.25), p < 0.05] and lower serum epinephrine levels in the supine position [72.70 (42.92, 122.85) vs. 114.50 (66.57, 227.50), p < 0.05]. Conclusions Serum EP levels have potential value in the differential diagnosis of VVS and PPS.
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Affiliation(s)
- Hua Wang
- Department of Pediatrics, Hebei Medical University, Shijiazhuang, China
- Department of Pediatric Cardiology, Children's Hospital of Hebei Province, Shijiazhuang, China
- Hebei Provincial Key Laboratory of Pediatric Cardiovascular Disease, Shijiazhuang, China
| | - Wandong Ma
- Department of Neurosurgery, Hebei General Hospital, Shijiazhuang, China
| | - Mei Jin
- Department of Pediatric Neurology, Children's Hospital of Hebei Province, Shijiazhuang, China
| | - Bo Li
- Department of Pediatric Cardiology, Children's Hospital of Hebei Province, Shijiazhuang, China
- Hebei Provincial Key Laboratory of Pediatric Cardiovascular Disease, Shijiazhuang, China
| | - Suzhen Sun
- Department of Pediatrics, Hebei Medical University, Shijiazhuang, China
- Department of Pediatric Neurology, Children's Hospital of Hebei Province, Shijiazhuang, China
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2
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Chang L, Peng L, Liu J, Wang M, Li M, Kong Q, Zhao H, Zhao C. Predictive analysis of catecholamines and electrolytes for recurrence of orthostatic intolerance in children. Front Pediatr 2023; 11:1220990. [PMID: 37705599 PMCID: PMC10495584 DOI: 10.3389/fped.2023.1220990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 08/08/2023] [Indexed: 09/15/2023] Open
Abstract
Background Orthostatic intolerance (OI) is usually mediated by the autonomic nerve and most often happens in the upright position. However, it can also occur in other positions and can be relieved by lying down while likely to have another attack after relief. In the current study, we aim to evaluate the predictive effect of catecholamines and electrolytes on the recurrence of OI in children. Materials and methods Children who were diagnosed with vasovagal syncope (VVS), postural tachycardia syndrome (POTS), and VVS combined with POTS were enrolled in this retrospective study and were followed up after 1-year physical treatment. Catecholamines in urine collected within 24 h, renin, angiotensin II, aldosterone in plasma, and electrolytes in both blood and urine collected in the morning were tested. A multivariate analysis and a receiver operating characteristic curve were used to validate the prediction effect. Results In the VVS cohort, the 24 h urine adrenaline (AD) and norepinephrine (NE) levels of the non-recurrence group were lower than the 24 h urine AD and NE levels of the recurrence group, with a significant difference of P < 0.05. A different content can also be witnessed in the POTS cohort that the urine of the non-recurrence group contained lower sodium and chlorine. As for the VVS + POTS cohort, the non-recurrence group has lower AD and NE levels and higher potassium and phosphorus levels in urine, the difference of which proved prominent as well. Conclusion The study provides further evidence that AD, NE, and electrolytes in urine are promising factors that are closely related to the recurrence of OI in children. The integrated evaluation system merging AD and NE may have better predictive ability.
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Affiliation(s)
| | | | | | | | | | | | | | - Cuifen Zhao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, China
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3
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Longo S, Legramante JM, Rizza S, Federici M. Vasovagal syncope: An overview of pathophysiological mechanisms. Eur J Intern Med 2023; 112:6-14. [PMID: 37030995 DOI: 10.1016/j.ejim.2023.03.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 03/09/2023] [Accepted: 03/23/2023] [Indexed: 04/10/2023]
Abstract
Syncope is a short-term transient loss of consciousness, characterized by rapid onset and complete spontaneous recovery. According to the 2018 European Society of Cardiology guidelines, three different types of syncope have been identified. However, all forms of syncope share a common final pathophysiological event, global cerebral hypoperfusion, which results from the inability of the circulatory system to maintain blood pressure at the level required to efficiently supply blood to the brain. The vasovagal syncope (VVS) is the most common form of syncope. Although, VVS is generally harmless, its frequent occurrence can negatively affect quality of life and increase the risk of adverse events. The pathophysiological mechanisms underlying VVS remain obscure. The multifaceted nature of VVS presents a veritable challenge to understanding this condition and developing preventative strategies. Thus, the aim of this review was to discuss the factors contributing to the pathogenesis of VVS and provide guidance for future research.
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Affiliation(s)
- Susanna Longo
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, Rome 00133 ITALY
| | - Jacopo M Legramante
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, Rome 00133 ITALY
| | - Stefano Rizza
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, Rome 00133 ITALY
| | - Massimo Federici
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, Rome 00133 ITALY.
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4
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Sardu C, Massimo Massetti M, Rambaldi P, Gatta G, Cappabianca S, Sasso FC, Santamaria M, Volpicelli M, Ducceschi V, Signoriello G, Paolisso G, Marfella R. SGLT2-inhibitors reduce the cardiac autonomic neuropathy dysfunction and vaso-vagal syncope recurrence in patients with type 2 diabetes mellitus: the SCAN study. Metabolism 2022; 137:155243. [PMID: 35732222 DOI: 10.1016/j.metabol.2022.155243] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/02/2022] [Accepted: 06/16/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND In patients with type 2 diabetes mellitus (T2DM) the vaso-vagal syncope (VVS) recurrence could be due to the alteration of autonomic system function, evaluated by heart rate variability (HRV), and by 123I-metaiodobenzylguanidine (123I-mIBG) myocardial scintigraphy indexes: Heart to Mediastinum ratio (H/Mlate), and Washout rate (WR). The SGLT2-I could modulate/reduce autonomic dysfunction in T2DM patients with VVS. This effect could reduce the VVS recurrence in T2DM patients. METHODS In a prospective multicenter study, after propensity score matching, we studied a population of 324 T2DM patients with VVS, divided into 161 SGLT2-I-users vs. 163 Non-SGLT2-I users. In these patients as SGLT2-I-users vs. Non-SGLT2-I users, we investigated the HRV and 123I-MIBG modifications and VVS recurrence at 12 months of follow-up. RESULTS At follow-up end, the SGLT2-I-users vs. Non-SGLT2-I users had best glucose homeostasis and lower values of inflammatory markers, and resting heart rate (p < 0.05). The SGLT2-I-users vs. Non-SGLT2-I users evidenced the lowest low frequency/high frequency ratio (LF/HFr), a significant difference for all the indexes of autonomic dysfunction via ECG Holter analysis, and higher values of H/Mlate (p < 0.05). Finally, comparing SGLT2-I-users vs. Non-SGLT2-I users, we found a higher rate of VVS recurrence events, specifically of the vasodepressor VVS recurrence at 1-year follow-up (p < 0.05). We did not find a significant difference of mixed and cardio-inhibitory VVS recurrence events at 1 year of follow-up in the study cohorts (p > 0.05). At the Cox regression analysis H/Mlate (0.710, [0.481-0.985]), and SGLT2-I therapy (0.550, [0.324-0.934]) predicted all causes of syncope recurrence at 1 year of follow-up. CONCLUSIONS Non-SGLT2-I users vs. SGLT2-I-users had alterations of the autonomic nervous system, with a higher rate of VVS recurrence at 1 year of follow-up. The indexes of cardiac denervation predicted the VVS recurrence, while the SGLT2-I reduced the risk of VVS recurrence. CLINICAL TRIAL REGISTRATION NUMBER NCT03717207.
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Affiliation(s)
- Celestino Sardu
- Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - M Massimo Massetti
- Cardiovascular and Arrhythmias Department "Gemelli Molise", Campobasso, Italy; Department of Cardiovascular and Thoracic Sciences, Catholic University of the Sacred Heart, Rome, Italy
| | - Pietro Rambaldi
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - Gianluca Gatta
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - Salvatore Cappabianca
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - Ferdinando Carlo Sasso
- Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - Matteo Santamaria
- Cardiovascular and Arrhythmias Department "Gemelli Molise", Campobasso, Italy.
| | - Mario Volpicelli
- Cardiovascular Diseases and Electrophysiology Unit, "S. Maria della Pietà Hospital", Naples, Italy
| | - Valentino Ducceschi
- Cardiovascular Diseases and Electrophysiology Unit, "Vecchio Pellegrini Hospital", Naples, Italy
| | - Giuseppe Signoriello
- Department of Mental Health, University of Campania "Luigi Vanvitelli", Naples, Italy.
| | - Giuseppe Paolisso
- Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy; "Mediterranea Cardiocentro", Naples, Italy.
| | - Raffaele Marfella
- Department of Advanced Medical and Surgical Sciences, University of Campania "Luigi Vanvitelli", Naples, Italy; "Mediterranea Cardiocentro", Naples, Italy.
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Miranda CM, da Silva RMFL, Peruhybe-Magalhães V, Brugada J. Vasoactive Biomarkers in Patients With Vasovagal Syncope During Head-Up Tilt Test: A Case-Control Study. CLINICAL MEDICINE INSIGHTS-CARDIOLOGY 2022; 16:11795468221116848. [PMID: 36046183 PMCID: PMC9421056 DOI: 10.1177/11795468221116848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 06/15/2022] [Indexed: 11/25/2022]
Abstract
Background: Vasovagal syncope (VVS) is the most common cause of syncope. Some stages of its pathophysiological mechanisms remain unclear. Vasoactive substances such as nitric oxide metabolites (NOx) and endothelin (ET) may be involved during acute orthostatic stress. Objective: To analyze plasma changes in NOx and ET and heart rate variability (HRV) in the supine positions (T1) and during the head-up tilt test (HUTT) (T2), in patients with VVS (case group) and control group. Methods: Thirty-seven patients (17 in the case group and 20 in the control group), matched for age and sex (mean aged 31.8 years) underwent HUTT with simultaneous HRV recording and venipuncture. Blood samples were collected during phases T1 and T2 and the analysis was performed without knowledge of the HUTT result. Results: In the total sample, there was an increase in NOx values (P = .014), however there was no increase in ET values from phase T1 to phase T2. Patients with VVS tended to increase plasma NOx values (P = .057) and had significantly higher plasma values compared to ET (P = .033) between phases T1 to T2. In the control group, there was no significant change in the values of these vasoactive substances. Regarding HRV, there were a decrease in the component HF (high frequency) and increased of the LF (low frequency)/HF ratio during HUTT. Conclusions: There was an increase in ET during HUTT occurred only in the case group. These patients are more likely to have an imbalance between antagonistic vasoactive biomarkers during orthostatic stress.
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Affiliation(s)
- Cláudia Madeira Miranda
- Faculty of Medicine, Federal University of Minas Gerais, Brazil.,Madre Teresa Hospital, Minas Gerais, Brazil
| | | | | | - Josep Brugada
- Institut Clínic Cardiovascular, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
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6
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Diaz-Canestro C, Sehgal A, Pentz B, Montero D. Sex specificity in orthostatic tolerance: the integration of haematological, cardiac, and endocrine factors. Eur J Prev Cardiol 2021; 29:e246-e248. [PMID: 34935030 DOI: 10.1093/eurjpc/zwab223] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Candela Diaz-Canestro
- Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada
| | - Arshia Sehgal
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
| | - Brandon Pentz
- Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
| | - David Montero
- Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada.,Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.,Department of Cardiac Sciences, Cumming School of Medicine, Calgary, AB, Canada
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7
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Goldstein DS. Stress and the "extended" autonomic system. Auton Neurosci 2021; 236:102889. [PMID: 34656967 PMCID: PMC10699409 DOI: 10.1016/j.autneu.2021.102889] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 09/06/2021] [Accepted: 09/28/2021] [Indexed: 12/22/2022]
Abstract
This review updates three key concepts of autonomic neuroscience-stress, the autonomic nervous system (ANS), and homeostasis. Hans Selye popularized stress as a scientific idea. He defined stress variously as a stereotyped response pattern, a state that evokes this pattern, or a stimulus that evokes the state. According to the "homeostat" theory stress is a condition where a comparator senses a discrepancy between sensed afferent input and a response algorithm, the integrated error signal eliciting specific patterns of altered effector outflows. Scientific advances since Langley's definition of the ANS have incited the proposal here of the "extended autonomic system," or EAS, for three reasons. (1) Several neuroendocrine systems are bound inextricably to Langley's ANS. The first to be described, by Cannon in the early 1900s, involves the hormone adrenaline, the main effector chemical of the sympathetic adrenergic system. Other neuroendocrine systems are the hypothalamic-pituitary-adrenocortical system, the arginine vasopressin system, and the renin-angiotensin-aldosterone system. (2) An evolving body of research links the ANS complexly with inflammatory/immune systems, including vagal anti-inflammatory and catecholamine-related inflammasomal components. (3) A hierarchical network of brain centers (the central autonomic network, CAN) regulates ANS outflows. Embedded within the CAN is the central stress system conceptualized by Chrousos and Gold. According to the allostasis concept, homeostatic input-output curves can be altered in an anticipatory, feed-forward manner; and prolonged or inappropriate allostatic adjustments increase wear-and-tear (allostatic load), resulting in chronic, stress-related, multi-system disorders. This review concludes with sections on clinical and therapeutic implications of the updated concepts offered here.
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Affiliation(s)
- David S Goldstein
- Autonomic Medicine Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA; Autonomic Medicine Section, CNP/DIR/NINDS/NIH, 9000 Rockville Pike MSC-1620, Building 10 Room 8N260, Bethesda, MD 20892-1620, USA..
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8
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Cerebral blood flow remains reduced after tilt testing in myalgic encephalomyelitis/chronic fatigue syndrome patients. Clin Neurophysiol Pract 2021; 6:245-255. [PMID: 34667909 PMCID: PMC8505270 DOI: 10.1016/j.cnp.2021.09.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 07/16/2021] [Accepted: 09/05/2021] [Indexed: 01/06/2023] Open
Abstract
Cerebral blood flow in ME/CFS patients remains abnormal 5 min post-tilt test. Post cerebral blood flow abnormalities do not depend on hemodynamic results and on end-tidal carbon dioxide pressures during the tilt-test. Post cerebral blood flow abnormalities are most severe in more severely diseased ME/CFS patients.
Objective Orthostatic symptoms in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) may be caused by an abnormal reduction in cerebral blood flow. An abnormal cerebral blood flow reduction was shown in previous studies, without information on the recovery pace of cerebral blood flow. This study examined the prevalence and risk factors for delayed recovery of cerebral blood flow in ME/CFS patients. Methods 60 ME/CFS adults were studied: 30 patients had a normal heart rate and blood pressure response during the tilt test, 4 developed delayed orthostatic hypotension, and 26 developed postural orthostatic tachycardia syndrome (POTS) during the tilt. Cerebral blood flow measurements, using extracranial Doppler, were made in the supine position pre-tilt, at end-tilt, and in the supine position at 5 min post-tilt. Also, cardiac index measurements were performed, using suprasternal Doppler imaging, as well as end-tidal PCO2 measurements. The change in cerebral blood flow from supine to end-tilt was expressed as a percent reduction with mean and (SD). Disease severity was scored as mild (approximately 50% reduction in activity), moderate (mostly housebound), or severe (mostly bedbound). Results End-tilt cerebral blood flow reduction was −29 (6)%, improving to −16 (7)% at post-tilt. No differences in either end-tilt or post-tilt measurements were found when patients with a normal heart rate and blood pressure were compared to those with POTS, or between patients with normocapnia (end-tidal PCO2 ≥ 30 mmHg) versus hypocapnia (end-tidal PCO2 < 30 mmHg) at end-tilt. A significant difference was found in the degree of abnormal cerebral blood flow reduction in the supine post-test in mild, moderate, and severe ME/CFS: mild: cerebral blood flow: −7 (2)%, moderate: −16 (3)%, and severe :-25 (4)% (p all < 0.0001). Cardiac index declined significantly during the tilt test in all 3 severity groups, with no significant differences between the groups. In the supine post-test cardiac index returned to normal in all patients. Conclusions During tilt testing, extracranial Doppler measurements show that cerebral blood flow is reduced in ME/CFS patients and recovery to normal supine values is incomplete, despite cardiac index returning to pre-tilt values. The delayed recovery of cerebral blood flow was independent of the hemodynamic findings of the tilt test (normal heart rate and blood pressure response, POTS, or delayed orthostatic hypotension), or the presence/absence of hypocapnia, and was only related to clinical ME/CFS severity grading. We observed a significantly slower recovery in cerebral blood flow in the most severely ill ME/CFS patients. Significance The finding that orthostatic stress elicits a post-stress cerebral blood flow reduction and that disease severity greatly influences the cerebral blood flow reduction may have implications on the advice of energy management after a stressor and on the advice of lying down after a stressor in these ME/CFS patients.
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Key Words
- BMI, Body Mass Index
- BSA, Body Surface Area
- CBF, Cerebral blood flow
- CI, Cardiac Index
- Cardiac Index
- Cerebral blood flow
- DBP, Diastolic Blood pressure
- Extracranial Doppler echography
- HR, Heart rate
- ICC, International Consensus Criteria
- ME/CFS
- ME/CFS, Myalgic encephalomyelitis/chronic fatigue syndrome
- NormHRBP, normal heart rate and blood pressure response
- Normal heart rate and blood pressure response
- Orthostatic intolerance
- PET, end-tidal pressure
- POTS, Postural orthostatic tachycardia syndrome
- Post exertional malaise
- Postural Orthostatic Tachycardia Syndrome
- Recovery
- SBP, Systolic Blood pressure
- Tilt table testing
- VTI, Time velocity integral
- dOH, delayed orthostatic hypotension
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Benditt DG, van Dijk JG, Krishnappa D, Adkisson WO, Sakaguchi S. Neurohormones in the Pathophysiology of Vasovagal Syncope in Adults. Front Cardiovasc Med 2020; 7:76. [PMID: 32478097 PMCID: PMC7232538 DOI: 10.3389/fcvm.2020.00076] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 04/14/2020] [Indexed: 02/02/2023] Open
Abstract
Vasovagal syncope (VVS) is the most common cause of syncope across all age groups. Nonetheless, despite its clinical importance and considerable research effort over many years, the pathophysiology of VVS remains incompletely understood. In this regard, numerous studies have been undertaken in an attempt to improve insight into the evolution of VVS episodes and many of these studies have examined neurohormonal changes that occur during the progression of VVS events primarily using the head-up tilt table testing model. In this regard, the most consistent finding is a marked increase in epinephrine (Epi) spillover into the circulation beginning at an early stage as VVS evolves. Reported alterations of circulating norepinephrine (NE), on the other hand, have been more variable. Plasma concentrations of other vasoactive agents have been reported to exhibit more variable changes during a VVS event, and for the most part change somewhat later, but in some instances the changes are quite marked. The neurohormones that have drawn the most attention include arginine vasopressin [AVP], adrenomedullin, to a lesser extent brain and atrial natriuretic peptides (BNP, ANP), opioids, endothelin-1 (ET-1) and serotonin. However, whether some or all of these diverse agents contribute directly to VVS pathophysiology or are principally a compensatory response to an evolving hemodynamic crisis is as yet uncertain. The goal of this communication is to summarize key reported neurohumoral findings in VVS, and endeavor to ascertain how they may contribute to observed hemodynamic alterations during VVS.
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Affiliation(s)
- David G Benditt
- Cardiovascular Division, Department of Medicine, Cardiac Arrhythmia and Syncope Center, University of Minnesota Medical School, Minneapolis, MN, United States
| | - J Gert van Dijk
- Department of Neurology, Leiden University Medical Center, Leiden, Netherlands
| | - Darshan Krishnappa
- Cardiovascular Division, Department of Medicine, Cardiac Arrhythmia and Syncope Center, University of Minnesota Medical School, Minneapolis, MN, United States
| | - Wayne O Adkisson
- Cardiovascular Division, Department of Medicine, Cardiac Arrhythmia and Syncope Center, University of Minnesota Medical School, Minneapolis, MN, United States
| | - Scott Sakaguchi
- Cardiovascular Division, Department of Medicine, Cardiac Arrhythmia and Syncope Center, University of Minnesota Medical School, Minneapolis, MN, United States
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10
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Lindenberger M, Fedorowski A, Melander O, Gallo W, Engvall J, Skoog J. Cardiovascular biomarkers and echocardiographic findings at rest and during graded hypovolemic stress in women with recurrent vasovagal syncope. J Cardiovasc Electrophysiol 2019; 30:2936-2943. [DOI: 10.1111/jce.14207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 09/19/2019] [Accepted: 09/26/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Marcus Lindenberger
- Department of CardiologyLinköping University HospitalLinköping Sweden
- Department of Medical and Health SciencesLinköping UniversityLinköping Sweden
| | - Arthur Fedorowski
- Department of Clinical SciencesLund UniversityMalmö Sweden
- Department of CardiologySkåne University HospitalMalmö Sweden
| | - Olle Melander
- Department of Clinical SciencesLund UniversityMalmö Sweden
| | - Widet Gallo
- Department of Clinical SciencesLund UniversityMalmö Sweden
| | - Jan Engvall
- Department of Medical and Health SciencesLinköping UniversityLinköping Sweden
| | - Johan Skoog
- Department of Medical and Health SciencesLinköping UniversityLinköping Sweden
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11
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Torabi P, Ricci F, Hamrefors V, Melander O, Sutton R, Benditt DG, Fedorowski A. Impact of Cardiovascular Neurohormones on Onset of Vasovagal Syncope Induced by Head-up Tilt. J Am Heart Assoc 2019; 8:e012559. [PMID: 31208249 PMCID: PMC6645642 DOI: 10.1161/jaha.119.012559] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Background Vasovagal reflex is the most common form of syncope, but the pathophysiological mechanisms that initiate the reflex are not well understood. We aimed to study supine and early orthostatic levels of the neurohormones involved in control of circulatory homeostasis in relation to the onset of tilt‐induced vasovagal syncope (VVS). Methods and Results A total of 827 patients who were investigated for unexplained syncope with head‐up tilt test (HUT) and optional nitroglycerin provocation (Italian protocol) had blood samples collected while supine and after 3‐minutes of HUT. Of these, 173 (20.9%) patients developed VVS during drug‐free HUT, 161 of whom (males 44.7%; age 45±21 years) had complete data. We analyzed levels of epinephrine, norepinephrine, C‐terminal pro–arginine vasopressin, C‐terminal endothelin‐1, and midregional fragments of pro–atrial natriuretic peptide and pro‐adrenomedullin in relation to time from tilt‐up to onset of VVS. We applied a linear regression model adjusted for age and sex. The mean time to syncope was 11±7 minutes. Older age (β=0.13; SE=0.03, P<0.001), higher supine systolic blood pressure (β=0.06; SE=0.03, P=0.02), and higher supine midregional fragment of pro‐adrenomedullin predicted longer time to syncope (β=2.31; SE=0.77, P=0.003), whereas supine levels of other neurohormones were not associated with time to syncope. Among 151 patients who developed VVS later than 3 minutes of HUT, increase in epinephrine (β=−3.24; SE=0.78, P<0.001) and C‐terminal pro–arginine vasopressin (β=−2.07; SE=0.61, P=0.001) at 3 minutes of HUT were related to shorter time to syncope. Conclusions Older age, higher blood pressure, and higher level of pro‐adrenomedullin are associated with later onset of VVS during tilt testing, whereas greater increase of tilt‐induced epinephrine and vasopressin release correlate with shorter time to syncope. See Editorial Williford et al
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Affiliation(s)
- Parisa Torabi
- 1 Department of Clinical Sciences Lund University Malmö Sweden.,2 Department of Clinical Physiology Skåne University Hospital Malmö Sweden
| | - Fabrizio Ricci
- 1 Department of Clinical Sciences Lund University Malmö Sweden.,3 Department of Neuroscience, Imaging and Clinical Sciences "G. d'Annunzio" University Chieti Italy.,4 Fondazione Villa Serena per la Ricerca Città Sant'Angelo Italy
| | - Viktor Hamrefors
- 1 Department of Clinical Sciences Lund University Malmö Sweden.,5 Department of Internal Medicine Skåne University Hospital Malmö Sweden
| | - Olle Melander
- 1 Department of Clinical Sciences Lund University Malmö Sweden.,5 Department of Internal Medicine Skåne University Hospital Malmö Sweden
| | - Richard Sutton
- 6 National Heart and Lung Institute Imperial College Hammersmith Hospital Campus London United Kingdom
| | - David G Benditt
- 7 Cardiac Arrhythmia Center Cardiovascular Division University of Minnesota Minneapolis MN
| | - Artur Fedorowski
- 1 Department of Clinical Sciences Lund University Malmö Sweden.,8 Department of Cardiology Skåne University Hospital Malmö Sweden
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12
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Abstract
See Article Torabi et al
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Affiliation(s)
- Noah N Williford
- 1 University of Iowa Hospitals & Clinics the Veterans Affairs Medical Center Iowa City IA
| | - Mark W Chapleau
- 1 University of Iowa Hospitals & Clinics the Veterans Affairs Medical Center Iowa City IA
| | - Brian Olshansky
- 1 University of Iowa Hospitals & Clinics the Veterans Affairs Medical Center Iowa City IA
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13
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Kohno R, Detloff BL, Chen LY, Norby FL, Benditt DG. Epinephrine rise concept. J Cardiovasc Electrophysiol 2019; 30:1396-1397. [PMID: 30950548 DOI: 10.1111/jce.13921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 03/07/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Ritsuko Kohno
- Cardiovascular Division, Cardiac Arrhythmia Center, University of Minnesota Medical Center, Minneapolis, Minnesota
| | - Barry Ls Detloff
- Cardiovascular Division, Cardiac Arrhythmia Center, University of Minnesota Medical Center, Minneapolis, Minnesota
| | - Lin Yee Chen
- Cardiovascular Division, Cardiac Arrhythmia Center, University of Minnesota Medical Center, Minneapolis, Minnesota
| | - Faye L Norby
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - David G Benditt
- Cardiovascular Division, Cardiac Arrhythmia Center, University of Minnesota Medical Center, Minneapolis, Minnesota
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14
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Clinical features of prolonged tilt-induced hypotension with an apparent vasovagal mechanism, but without syncope. Auton Neurosci 2019; 218:87-93. [PMID: 30879926 DOI: 10.1016/j.autneu.2019.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 03/08/2019] [Accepted: 03/08/2019] [Indexed: 11/24/2022]
Abstract
BACKGROUND A previous study of electroencephalography (EEG) changes with syncope led to a finding that some young patients develop prolonged periods of tilt-induced hypotension, but they do not lose consciousness. The present study aim was to compare patterns of hemodynamic changes, measures of duration, and sweating between these patients and patients with tilt-induced vasovagal syncope. METHODS In an observational study, qualitative changes in hemodynamic parameters were compared between patients with prolonged hypotension (n = 30) and with syncope (n = 30). To demonstrate that periods of hypotension far-exceed the typical presyncope period, several parameters were used to compare the durations of events between groups. Differences in sweating patterns were explored. RESULTS Parallels in hemodynamic changes were present in both groups suggesting similar vasovagal mechanisms. Patients with prolonged hypotension had longer durations of hypotension (165 ± 44 versus 57 ± 13 s, p < 0.001), diminished cardiac output (109 ± 38 versus 32 ± 9 s, p < 0.001), and EEG slowing (85 ± 31 versus 9 ± 4 s, p < 0.001) compared to patients with syncope. While all patients generated an increase in sweat rate, those with hypotension only developed a robust sweat response that always preceded the plateau in hypotension compared to 14 (47%) patients with syncope who developed an increase in sweating prior to syncope, p < 0.001. CONCLUSIONS Similarities are present among hemodynamic changes with prolonged hypotension and with tilt-induced vasovagal syncope, suggesting a possible vasovagal mechanism for prolonged hypotension. If true, understanding why some individuals develop a vasovagal response that does not culminate in rapid syncope may help to elucidate the physiologic underpinnings of the vasovagal reflex.
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15
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Kohno R, Detloff BLS, Chen LY, Norby FL, Benditt DG. Greater early epinephrine rise with head-up posture: A marker of increased syncope susceptibility in vasovagal fainters. J Cardiovasc Electrophysiol 2019; 30:289-296. [PMID: 30431678 PMCID: PMC6422744 DOI: 10.1111/jce.13792] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/27/2018] [Accepted: 11/13/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND Head-up tilt (HUT) is widely used for diagnostic evaluation of patients with suspected vasovagal syncope (VVS), but also offers an opportunity to study VVS pathophysiology. In this regard, it is known that plasma epinephrine (Epi) levels and Epi/norepinephrine (NE) ratio are markedly increased from baseline at the time of HUT-induced VVS. However, whether these changes contribute to VVS susceptibility remains uncertain. OBJECTIVE We hypothesized that if catecholamines contributed to VVS directly, then a greater increase of plasma Epi and Epi/NE ratio early during HUT would be associated with shorter time to syncope. METHODS The patient population comprised 33 individuals (14 men, 43 ± 2 years) with suspected VVS in whom 70° HUT reproduced symptoms. Arterial Epi and NE concentrations were collected at baseline (supine) and 2 minutes of HUT. Linear, exponential, and multiple regression were used to access the association between changing catecholamine levels and time to syncope. RESULTS Mean ± SD time to positive HUT was 11 (7.6) minutes. Higher plasma Epi levels (pg/mL) both at baseline and at 2 minutes upright correlated with shorter time to syncope (baseline, R = -0.35, P = 0.048; and 2 minutes, R = -0.58, P = 0.001). Similarly, a greater Epi/NE ratio at 2 minutes head-up correlated with earlier time to syncope (R = -0.49, P = 0.007). These relationships remained significant after adjusting for age and sex (P = 0.006 and 0.02, respectively). CONCLUSION Greater Epi levels and Epi/NE ratio early during HUT were associated with shorter time to VVS, suggesting a possible contribution to VVS susceptibility.
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Affiliation(s)
- Ritsuko Kohno
- Cardiac Arrhythmia Center, Cardiovascular Division, University of Minnesota, Minneapolis, Minnesota
| | - Barry L S Detloff
- Cardiac Arrhythmia Center, Cardiovascular Division, University of Minnesota, Minneapolis, Minnesota
| | - Lin Yee Chen
- Cardiac Arrhythmia Center, Cardiovascular Division, University of Minnesota, Minneapolis, Minnesota
| | - Faye L Norby
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota
| | - David G Benditt
- Cardiac Arrhythmia Center, Cardiovascular Division, University of Minnesota, Minneapolis, Minnesota
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16
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Fedorowski A, Sutton R. Understanding vasovagal syncope akin to the philosopher's stone? J Cardiovasc Electrophysiol 2018; 30:297-298. [PMID: 30536536 DOI: 10.1111/jce.13810] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 12/07/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Artur Fedorowski
- Department of Cardiology, Lund University and Skåne University Hospital, Malmö, Sweden
| | - Richard Sutton
- Department of Cardiology, National Heart and Lung Institute, Imperial College, Hammersmith Hospital, London, UK
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17
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Li H, Liao Y, Han Z, Wang Y, Liu P, Zhang C, Tang C, Du J, Jin H. Head-up tilt test provokes dynamic alterations in total peripheral resistance and cardiac output in children with vasovagal syncope. Acta Paediatr 2018; 107:1786-1791. [PMID: 29603793 DOI: 10.1111/apa.14342] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/26/2018] [Accepted: 03/22/2018] [Indexed: 11/29/2022]
Abstract
AIM This study examined the total peripheral vascular resistance (TPVR) and cardiac output changes due to the head-up tilt test (HUTT) in children with vasovagal syncope (VVS). METHODS From December 2013 to January 2016, we recruited 77 children diagnosed with VVS group at Peking University First Hospital, China, and 28 children without VVS provided the control group. Heart rate, blood pressure, TPVR, cardiac output and baroreflex sensitivity were monitored during the HUTT. RESULTS In the supine position, TPVR and baroreflex sensitivity were higher in the patients with VVS than the controls, but cardiac output did not differ between the two groups. There were obvious increases in the VVS patients from TPVR in the supine position to the prepositive response period (p < 0.05), then the positive response period (p < 0.01). However, we noted the opposite trend in cardiac output, from the supine position to the prepositive response period (p < 0.01) then the positive response period (p < 0.01). CONCLUSION During HUTT, children with VVS demonstrated increases in TPVR but decreases in cardiac output, during the transition from the supine position to the positive response. This response might be involved in the pathogenesis of VVS.
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Affiliation(s)
- Hongxia Li
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | - Ying Liao
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | | | - Yuli Wang
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | - Ping Liu
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | - Chunyu Zhang
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | - Chaoshu Tang
- Department of Physiology and Pathophysiology; Peking University Health Sciences Centre; Beijing China
| | - Junbao Du
- Department of Pediatrics; Peking University First Hospital; Beijing China
| | - Hongfang Jin
- Department of Pediatrics; Peking University First Hospital; Beijing China
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18
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Heyer GL, Boles LH, Harvey RA, Cismowski MJ. Gastric myoelectrical and neurohormonal changes associated with nausea during tilt-induced syncope. Neurogastroenterol Motil 2018; 30. [PMID: 28960795 DOI: 10.1111/nmo.13220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 09/07/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Nausea is a common prodromal symptom of neurally mediated syncope, but the biological factors linking nausea with syncope have not been studied. We aimed to characterize nausea during tilt-induced syncope by exploring related changes in gastric myoelectrical activity and plasma epinephrine, norepinephrine, and vasopressin concentrations across study phases of recumbency, tilt, syncope, and recovery. METHODS Electrogastrographic and plasma hormone changes were compared between patients with tilt-induced syncope and nausea (n = 18) and control subjects (n = 6) without symptoms or hemodynamic changes during tilt-table testing. KEY RESULTS Over a 4-minute period preceding syncope, sequential electrogastrography epochs demonstrated an increase over time in bradygastria (P = .003) and tachygastria (P = .014) power ratios, while the dominant frequency (P < .001) and the percent normogastria (P = .004) decreased. Syncope led to significant differences between cases and controls in electrogastrographic power ratios in each frequency range: bradygastria (P = .001), tachygastria (P = .005), and normogastria (P = .03). Nausea always followed electrogastrographic changes, and nausea resolution always preceded electrogastrographic normalization. Plasma vasopressin (676.5 ± 122.8 vs 91.2 ± 15.3 pg/mL, P = .012) and epinephrine (434 ± 91.3 vs 48.7 ± 2.5 pg/mL, P = .03), but not norepinephrine (P > .05), also differed with syncope between cases and controls. CONCLUSIONS AND INFERENCES The nausea related to tilt-induced syncope is temporally associated with changes in gastric myoelectrical activity and increases in plasma vasopressin and epinephrine. The biological mechanisms that induce syncope are physiologically distinct from other experimental models of nausea such as illusory self-motion, yet nausea with syncope appears to have similarly associated electrogastrographic and hormone changes. Thus, tilt-induced syncope could serve as an informative experimental model for nausea research.
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Affiliation(s)
- G L Heyer
- Division of Pediatric Neurology, Nationwide Children's Hospital, Columbus, OH, USA.,Department of Pediatrics, Nationwide Children's Hospital, Columbus, OH, USA
| | - L H Boles
- Department of Medicine, The Ohio State University, Columbus, OH, USA
| | - R A Harvey
- Department of Pediatrics, Nationwide Children's Hospital, Columbus, OH, USA
| | - M J Cismowski
- Department of Pediatrics, Nationwide Children's Hospital, Columbus, OH, USA.,Center for Cardiovascular Research, Nationwide Children's Hospital, Columbus, OH, USA
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Badertscher P, Nestelberger T, de Lavallaz JDF, Than M, Morawiec B, Kawecki D, Miró Ò, López B, Martin-Sanchez FJ, Bustamante J, Geigy N, Christ M, Di Somma S, Peacock WF, Cullen L, Sarasin F, Flores D, Tschuck M, Boeddinghaus J, Twerenbold R, Wildi K, Sabti Z, Puelacher C, Rubini Giménez M, Kozhuharov N, Shrestha S, Strebel I, Rentsch K, Keller DI, Poepping I, Buser A, Kloos W, Lohrmann J, Kuehne M, Osswald S, Reichlin T, Mueller C. Prohormones in the Early Diagnosis of Cardiac Syncope. J Am Heart Assoc 2017; 6:JAHA.117.006592. [PMID: 29426039 PMCID: PMC5779001 DOI: 10.1161/jaha.117.006592] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Background The early detection of cardiac syncope is challenging. We aimed to evaluate the diagnostic value of 4 novel prohormones, quantifying different neurohumoral pathways, possibly involved in the pathophysiological features of cardiac syncope: midregional–pro‐A‐type natriuretic peptide (MRproANP), C‐terminal proendothelin 1, copeptin, and midregional‐proadrenomedullin. Methods and Results We prospectively enrolled unselected patients presenting with syncope to the emergency department (ED) in a diagnostic multicenter study. ED probability of cardiac syncope was quantified by the treating ED physician using a visual analogue scale. Prohormones were measured in a blinded manner. Two independent cardiologists adjudicated the final diagnosis on the basis of all clinical information, including 1‐year follow‐up. Among 689 patients, cardiac syncope was the adjudicated final diagnosis in 125 (18%). Plasma concentrations of MRproANP, C‐terminal proendothelin 1, copeptin, and midregional‐proadrenomedullin were all significantly higher in patients with cardiac syncope compared with patients with other causes (P<0.001). The diagnostic accuracies for cardiac syncope, as quantified by the area under the curve, were 0.80 (95% confidence interval [CI], 0.76–0.84), 0.69 (95% CI, 0.64–0.74), 0.58 (95% CI, 0.52–0.63), and 0.68 (95% CI, 0.63–0.73), respectively. In conjunction with the ED probability (0.86; 95% CI, 0.82–0.90), MRproANP, but not the other prohormone, improved the area under the curve to 0.90 (95% CI, 0.87–0.93), which was significantly higher than for the ED probability alone (P=0.003). An algorithm to rule out cardiac syncope combining an MRproANP level of <77 pmol/L and an ED probability of <20% had a sensitivity and a negative predictive value of 99%. Conclusions The use of MRproANP significantly improves the early detection of cardiac syncope among unselected patients presenting to the ED with syncope. Clinical Trial Registration URL: http://www.clinicaltrials.gov. Unique identifier: NCT01548352.
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Affiliation(s)
- Patrick Badertscher
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Thomas Nestelberger
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,Department of Internal Medicine, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Jeanne du Fay de Lavallaz
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Martin Than
- GREAT Network, Rome, Italy.,Christchurch Hospital, Christchurch, New Zealand
| | - Beata Morawiec
- GREAT Network, Rome, Italy.,2nd Department of Cardiology, Medical University of Silesia, Zabrze, Poland
| | - Damian Kawecki
- GREAT Network, Rome, Italy.,2nd Department of Cardiology, Medical University of Silesia, Zabrze, Poland
| | - Òscar Miró
- GREAT Network, Rome, Italy.,Emergency Department, Hospital Clinic, Barcelona, Catalonia, Spain
| | - Beatriz López
- GREAT Network, Rome, Italy.,Emergency Department, Hospital Clinic, Barcelona, Catalonia, Spain
| | - F Javier Martin-Sanchez
- GREAT Network, Rome, Italy.,Emergency Department, Hospital Clínico San Carlos, Madrid, Spain
| | - José Bustamante
- GREAT Network, Rome, Italy.,Emergency Department, Hospital Clínico San Carlos, Madrid, Spain
| | - Nicolas Geigy
- Department of Emergency Medicine, Hospital of Liestal, Switzerland
| | - Michael Christ
- GREAT Network, Rome, Italy.,Department of Emergency Care, Lucerne General Hospital, Lucerne, Switzerland
| | - Salvatore Di Somma
- GREAT Network, Rome, Italy.,Emergency Medicine, Department of Medical-Surgery Sciences and Translational Medicine, Sant'Andrea Hospital University Sapienza Rome, Rome, Italy
| | - W Frank Peacock
- GREAT Network, Rome, Italy.,Department of Emergency Medicine, Baylor College of Medicine, Houston, TX
| | - Louise Cullen
- GREAT Network, Rome, Italy.,Royal Brisbane and Women's Hospital, Herston, Australia
| | - François Sarasin
- Emergency Department, Hôpitaux Universitaires de Genève, Switzerland
| | - Dayana Flores
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Michael Tschuck
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Jasper Boeddinghaus
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,Department of Internal Medicine, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Raphael Twerenbold
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy.,Department of General and Interventional Cardiology, Hamburg University Heart Center, Hamburg, Germany
| | - Karin Wildi
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Zaid Sabti
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Christian Puelacher
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Maria Rubini Giménez
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Nikola Kozhuharov
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Samyut Shrestha
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Ivo Strebel
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Katharina Rentsch
- Laboratory Medicine, University Hospital Basel University of Basel, Switzerland
| | - Dagmar I Keller
- Emergency Department, University Hospital Zurich, Zurich, Switzerland
| | - Imke Poepping
- Department of Internal Medicine, Hospital of Lachen, Switzerland
| | - Andreas Buser
- Department of Hematology, University Hospital Basel University of Basel, Switzerland.,Blood Transfusion Centre, Swiss Red Cross, Basel, Switzerland
| | - Wanda Kloos
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland
| | - Jens Lohrmann
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland
| | - Michael Kuehne
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland
| | - Stefan Osswald
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland
| | - Tobias Reichlin
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland.,GREAT Network, Rome, Italy
| | - Christian Mueller
- Cardiovascular Research Institute Basel and Department of Cardiology, University Hospital Basel University of Basel, Switzerland .,GREAT Network, Rome, Italy
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Jardine DL, Wieling W, Brignole M, Lenders JWM, Sutton R, Stewart J. The pathophysiology of the vasovagal response. Heart Rhythm 2017; 15:921-929. [PMID: 29246828 DOI: 10.1016/j.hrthm.2017.12.013] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Indexed: 10/18/2022]
Abstract
In part I of this study, we found that the classical studies on vasovagal syncope, conducted in fit young subjects, overstated vasodilatation as the dominant hypotensive mechanism. Since 1980, blood pressure and cardiac output have been measured continuously using noninvasive methods during tilt, mainly in patients with recurrent syncope, including women and the elderly. This has allowed us to analyze in more detail the complex sequence of hemodynamic changes leading up to syncope in the laboratory. All tilt-sensitive patients appear to progress through 4 phases: (1) early stabilization, (2) circulatory instability, (3) terminal hypotension, and (4) recovery. The physiology responsible for each phase is discussed. Although the order of phases is consistent, the time spent in each phase may vary. In teenagers and young adults, progressive hypotension during phases 2 and 3 can be driven by vasodilatation or falling cardiac output. The fall in cardiac output is secondary to a progressive decrease in stroke volume because blood is pooled in the splanchnic veins. In adults a fall in cardiac output is the dominant hypotensive mechanism because systemic vascular resistance always remains above baseline levels.
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Affiliation(s)
- David L Jardine
- Department of General Medicine, Christchurch Hospital, University of Otago, Christchurch, New Zealand.
| | - Wouter Wieling
- Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Michele Brignole
- Department of Cardiology, Arrhythmologic Centre, Ospedali del Tigullio, Lavagna, Italy
| | - Jacques W M Lenders
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands; Department of Internal Medicine III, Technical University Dresden, Dresden, Germany
| | - Richard Sutton
- National Heart and Lung institute, Imperial College, London, United Kingdom
| | - Julian Stewart
- Departments of Pediatrics, Physiology, and Medicine, New York Medical College, Valhalla, New York
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21
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Flevari P, Leftheriotis D, Kroupis C, Antonakos G, Lekakis J, Dima K. Copeptin levels in patients with vasovagal syncope. Int J Cardiol 2017; 230:642-645. [DOI: 10.1016/j.ijcard.2017.01.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 12/31/2016] [Accepted: 01/03/2017] [Indexed: 12/25/2022]
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22
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Rowe PC, Underhill RA, Friedman KJ, Gurwitt A, Medow MS, Schwartz MS, Speight N, Stewart JM, Vallings R, Rowe KS. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Diagnosis and Management in Young People: A Primer. Front Pediatr 2017; 5:121. [PMID: 28674681 PMCID: PMC5474682 DOI: 10.3389/fped.2017.00121] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/08/2017] [Indexed: 02/02/2023] Open
Abstract
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex disease that affects children and adolescents as well as adults. The etiology has not been established. While many pediatricians and other health-care providers are aware of ME/CFS, they often lack essential knowledge that is necessary for diagnosis and treatment. Many young patients experience symptoms for years before receiving a diagnosis. This primer, written by the International Writing Group for Pediatric ME/CFS, provides information necessary to understand, diagnose, and manage the symptoms of ME/CFS in children and adolescents. ME/CFS is characterized by overwhelming fatigue with a substantial loss of physical and mental stamina. Cardinal features are malaise and a worsening of symptoms following minimal physical or mental exertion. These post-exertional symptoms can persist for hours, days, or weeks and are not relieved by rest or sleep. Other symptoms include cognitive problems, unrefreshing or disturbed sleep, generalized or localized pain, lightheadedness, and additional symptoms in multiple organ systems. While some young patients can attend school, on a full or part-time basis, many others are wheelchair dependent, housebound, or bedbound. Prevalence estimates for pediatric ME/CFS vary from 0.1 to 0.5%. Because there is no diagnostic test for ME/CFS, diagnosis is purely clinical, based on the history and the exclusion of other fatiguing illnesses by physical examination and medical testing. Co-existing medical conditions including orthostatic intolerance (OI) are common. Successful management is based on determining the optimum balance of rest and activity to help prevent post-exertional symptom worsening. Medications are helpful to treat pain, insomnia, OI and other symptoms. The published literature on ME/CFS and specifically that describing the diagnosis and management of pediatric ME/CFS is very limited. Where published studies are lacking, recommendations are based on the clinical observations and practices of the authors.
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Affiliation(s)
- Peter C Rowe
- Division of General Pediatrics and Adolescent Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | | | - Kenneth J Friedman
- Pharmacology and Physiology, New Jersey Medical School, Newark, NJ, United States
| | - Alan Gurwitt
- Yale Child Study Center, Harvard Medical School, University of Connecticut School of Medicine, Newton Highlands, MA, United States
| | - Marvin S Medow
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, New York Medical College, Valhalla, NY, United States
| | | | | | - Julian M Stewart
- Division of Pediatric Cardiology, New York Medical College, Valhalla, NY, United States
| | - Rosamund Vallings
- Primary Care/Chronic Fatigue Syndrome Clinic, Howick Health and Medical, Auckland, New Zealand
| | - Katherine S Rowe
- Department of General Medicine, Royal Children's Hospital, Murdoch Children's Research Institute, Melbourne, VIC, Australia
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Wagoner AL, Shaltout HA, Fortunato JE, Diz DI. Distinct neurohumoral biomarker profiles in children with hemodynamically defined orthostatic intolerance may predict treatment options. Am J Physiol Heart Circ Physiol 2016; 310:H416-25. [PMID: 26608337 PMCID: PMC4888538 DOI: 10.1152/ajpheart.00583.2015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 11/23/2015] [Indexed: 12/31/2022]
Abstract
Studies of adults with orthostatic intolerance (OI) have revealed altered neurohumoral responses to orthostasis, which provide mechanistic insights into the dysregulation of blood pressure control. Similar studies in children with OI providing a thorough neurohumoral profile are lacking. The objective of the present study was to determine the cardiovascular and neurohumoral profile in adolescent subjects presenting with OI. Subjects at 10-18 yr of age were prospectively recruited if they exhibited two or more traditional OI symptoms and were referred for head-up tilt (HUT) testing. Circulating catecholamines, vasopressin, aldosterone, renin, and angiotensins were measured in the supine position and after 15 min of 70° tilt. Heart rate and blood pressure were continuously measured. Of the 48 patients, 30 patients had an abnormal tilt. Subjects with an abnormal tilt had lower systolic, diastolic, and mean arterial blood pressures during tilt, significantly higher levels of vasopressin during HUT, and relatively higher catecholamines and ANG II during HUT than subjects with a normal tilt. Distinct neurohumoral profiles were observed when OI subjects were placed into the following groups defined by the hemodynamic response: postural orthostatic tachycardia syndrome (POTS), orthostatic hypotension (OH), syncope, and POTS/syncope. Key characteristics included higher HUT-induced norepinephrine in POTS subjects, higher vasopressin in OH and syncope subjects, and higher supine and HUT aldosterone in OH subjects. In conclusion, children with OI and an abnormal response to tilt exhibit distinct neurohumoral profiles associated with the type of the hemodynamic response during orthostatic challenge. Elevated arginine vasopressin levels in syncope and OH groups are likely an exaggerated response to decreased blood flow not compensated by higher norepinephrine levels, as observed in POTS subjects. These different compensatory mechanisms support the role of measuring neurohumoral profiles toward the goal of selecting more focused and mechanistic-based treatment options for pediatric patients with OI.
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Affiliation(s)
- Ashley L Wagoner
- Neuroscience Graduate Program, Wake Forest Graduate School of Arts and Sciences, Winston-Salem, North Carolina; Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Hossam A Shaltout
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, North Carolina; Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - John E Fortunato
- Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, North Carolina; Department of General Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina; and Department of Pediatrics, Virginia Commonwealth University School of Medicine, Richmond, Virginia
| | - Debra I Diz
- Neuroscience Graduate Program, Wake Forest Graduate School of Arts and Sciences, Winston-Salem, North Carolina; Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, North Carolina; Department of General Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
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Rash A, McRae M, Fatehi J, Richie D, Solbiati M, Pillay N, Ulke-Lemée A, MacDonald J, Sheldon R. Assessment of endothelin and copeptin as biomarkers for vasovagal syncope. Eur J Clin Invest 2016; 46:141-5. [PMID: 26641207 DOI: 10.1111/eci.12576] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 11/26/2015] [Indexed: 01/13/2023]
Abstract
BACKGROUND The diagnosis of vasovagal syncope continues to be difficult despite the use of accurate histories, tilt testing and implantable loop recorders. A circulating biomarker might be useful to facilitate diagnoses. Both endothelin-1 and vasopressin are increased during positive tilt tests resulting in syncope. Copeptin is a stable cleavage product of vasopressin formation. We conducted a pilot study to assess the utility of endothelin-1 and copeptin as circulating biomarkers of vasovagal syncope. METHODS Three populations were studied: syncope patients, epilepsy patients and controls. Vasovagal syncope diagnosis was ascertained with the Calgary Syncope Score and epilepsy diagnosis was confirmed with EEG. Plasma levels of endothelin-1 were measured using by ELISA and copeptin levels were determined using an EIA kit. RESULTS Asymptomatic control subjects had mean age 35 ± 11 years (7/22 male); epileptic subjects had mean age 32 ± 7 years (4/15 male); and syncope subjects had mean age 33 ± 16 years (4 of 21 male). Circulating plasma levels of endothelin-1 and copeptin were no different among the three groups. Mean concentrations of endothelin-1 were as follows: syncope, 23 ± 32 pg/mL; controls, 21 ± 17 pg/mL; and epileptics, 18 ± 12 pg/mL. Mean concentrations of copeptin were as follows: syncope, 1·29 ± 0·79 ng/mL; controls, 1·25 ± 0·79 ng/mL; and seizures, 1·23 ± 0·45 ng/mL. There were no significant correlations between syncope frequency and copeptin or endothelin-1 levels. CONCLUSION Circulating plasma endothelin-1 and copeptin levels are not significantly different among populations of controls, syncope patients and seizure patients.
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Affiliation(s)
- Arjun Rash
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Maureen McRae
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Jaleh Fatehi
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Deborah Richie
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Monica Solbiati
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Neelan Pillay
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Annegret Ulke-Lemée
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Justin MacDonald
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
| | - Robert Sheldon
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada
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Carter JR, Goldstein DS. Sympathoneural and adrenomedullary responses to mental stress. Compr Physiol 2015; 5:119-46. [PMID: 25589266 DOI: 10.1002/cphy.c140030] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This concept-based review provides historical perspectives and updates about sympathetic noradrenergic and sympathetic adrenergic responses to mental stress. The topic of this review has incited perennial debate, because of disagreements over definitions, controversial inferences, and limited availability of relevant measurement tools. The discussion begins appropriately with Cannon's "homeostasis" and his pioneering work in the area. This is followed by mental stress as a scientific idea and the relatively new notions of allostasis and allostatic load. Experimental models of mental stress in rodents and humans are discussed, with particular attention to ethical constraints in humans. Sections follow on sympathoneural responses to mental stress, reactivity of catecholamine systems, clinical pathophysiologic states, and the cardiovascular reactivity hypothesis. Future advancement of the field will require integrative approaches and coordinated efforts between physiologists and psychologists on this interdisciplinary topic.
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Affiliation(s)
- Jason R Carter
- Department of Kinesiology and Integrative Physiology, Michigan Technological University, Houghton, Michigan Clinical Neurocardiology Section, Clinical Neurosciences Program, Division of Intramural Research, National Institutes of Health, Bethesda, Maryland
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Orthostatic Changes in Hemodynamics and Cardiovascular Biomarkers in Dysautonomic Patients. PLoS One 2015; 10:e0128962. [PMID: 26053073 PMCID: PMC4460014 DOI: 10.1371/journal.pone.0128962] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 05/04/2015] [Indexed: 01/24/2023] Open
Abstract
Background Impaired autonomic control of postural homeostasis results in orthostatic intolerance. However, the role of neurohormones in orthostatic intolerance has not been explained. Methods Six-hundred-and-seventy-one patients (299 males; 55±22 years) with unexplained syncope underwent head-up tilt (HUT) with serial blood sampling. Systolic blood pressure (SBP) and heart rate (HR) supine, after 3min, and lowest BP/highest HR during HUT were recorded. Plasma levels of epinephrine, norepinephrine, renin, C-terminal-pro-arginine-vasopressin (CT-proAVP), C-terminal- endothelin-1 (CT-proET-1), and mid-regional-fragment of pro-atrial-natriuretic-peptide (MR-proANP) were determined at supine and 3min of HUT. Multivariate-adjusted logistic regression model was applied to compare 1st (reference) with 4th quartile of 3 min and maximal ΔSBP/ΔHR (i.e. pronounced hypotension or tachycardia) vs. changes in neuroendocrine biomarkers, respectively. Results Higher resting CT-proET-1 predicted BP fall at 3min (Odds ratio (OR) per 1 SD: 1.62, 95%CI 1.18–2.22; p = 0.003), and max BP fall during HUT (1.82, 1.28–2.61; p = 0.001). Higher resting CT-proAVP predicted BP fall at 3min (1.33, 1.03–1.73; p = 0.03), which was also associated with increase in CT-proAVP (1.86, 1.38–2.51; p = 0.00005) and epinephrine (1.47, 1.12–1.92; p = 0.05) during HUT. Lower resting MR-proANP predicted tachycardia at 3min (0.37, 0.24–0.59; p = 0.00003), and max tachycardia during HUT (0.47, 0.29–0.77; p = 0.002). Further, tachycardia during HUT was associated with increase in epinephrine (1.60, 1.15–2.21; p = 0.005), and norepinephrine (1.87, 1.38–2.53; p = 0.005). Conclusions Resting CT-proET-1 and CT-proAVP are increased in orthostatic hypotension, while resting MR-proANP is decreased in postural tachycardia. Moreover, early BP fall during orthostasis evokes increase in CT-proAVP and epinephrine, while postural tachycardia is associated with increase in norepinephrine and epinephrine.
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Goldstein DS. Concepts of scientific integrative medicine applied to the physiology and pathophysiology of catecholamine systems. Compr Physiol 2014; 3:1569-610. [PMID: 24265239 DOI: 10.1002/cphy.c130006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review presents concepts of scientific integrative medicine and relates them to the physiology of catecholamine systems and to the pathophysiology of catecholamine-related disorders. The applications to catecholamine systems exemplify how scientific integrative medicine links systems biology with integrative physiology. Concepts of scientific integrative medicine include (i) negative feedback regulation, maintaining stability of the body's monitored variables; (ii) homeostats, which compare information about monitored variables with algorithms for responding; (iii) multiple effectors, enabling compensatory activation of alternative effectors and primitive specificity of stress response patterns; (iv) effector sharing, accounting for interactions among homeostats and phenomena such as hyperglycemia attending gastrointestinal bleeding and hyponatremia attending congestive heart failure; (v) stress, applying a definition as a state rather than as an environmental stimulus or stereotyped response; (vi) distress, using a noncircular definition that does not presume pathology; (vii) allostasis, corresponding to adaptive plasticity of feedback-regulated systems; and (viii) allostatic load, explaining chronic degenerative diseases in terms of effects of cumulative wear and tear. From computer models one can predict mathematically the effects of stress and allostatic load on the transition from wellness to symptomatic disease. The review describes acute and chronic clinical disorders involving catecholamine systems-especially Parkinson disease-and how these concepts relate to pathophysiology, early detection, and treatment and prevention strategies in the post-genome era.
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Affiliation(s)
- David S Goldstein
- Clinical Neurocardiology Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
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Wójtowicz J, Szczepański W, Bogdan A, Baran M, Szczurak J, Bossowski A. Natriuretic peptides in the evaluation of syncope in children and adolescents. Scandinavian Journal of Clinical and Laboratory Investigation 2014; 74:301-5. [PMID: 24564632 DOI: 10.3109/00365513.2014.883550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Natriuretic peptides have an increasing role in assessing cardiovascular conditions. The number of papers addressing their role in the evaluation of children with syncope of unclear etiology is sparse. The aim of this study was to determine whether measuring atrial natriuretic peptide (ANP) and the inactive form, N-terminal prohormone of brain natriuretic peptide (NT-proBNP) concentration in children admitted due to differential diagnosis of syncope can be helpful in establishing the most probable cause of this condition. METHODS The study included 88 patients between 9 and 18 years of age hospitalized due to syncope. The control group comprised 25 healthy children. In order to identify the cause of syncope, children with this condition were subjected to cardiologic and neurologic evaluation, and ANP and NT-proBNP concentrations were determined. RESULTS The syncope group and the controls did not differ significantly in terms of natriuretic peptides concentrations. Similarly, no significant intergroup differences in natriuretic peptide concentrations were documented between children representing various types of response to the tilt test, and between the subgroups of patients with syncope of various origins. CONCLUSION Analysis of natriuretic peptides concentrations in children with syncope does not result in unambiguous findings that would enable establishing accurate diagnosis.
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Affiliation(s)
- Jerzy Wójtowicz
- Department of Pediatrics, Endocrinology, Diabetology with Cardiology Division, Medical University of Bialystok , Bialystok , Poland
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Fedorowski A, Burri P, Struck J, Juul-Möller S, Melander O. Novel cardiovascular biomarkers in unexplained syncopal attacks: the SYSTEMA cohort. J Intern Med 2013; 273:359-67. [PMID: 23510366 DOI: 10.1111/joim.12043] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES The aim of the study was to investigate the resting levels of novel cardiovascular biomarkers in common types of noncardiac syncope. DESIGN AND SETTING An observational study was conducted including 255 patients (mean age 60 years, range 15-93; 45% men) with unexplained syncopal attacks. Subjects underwent an expanded head-up tilt test including carotid sinus massage, and nitroglycerin provocation if indicated. Using logistic regression, we explored the associations between specific diagnoses of syncope and resting levels of circulating biomarkers: C-terminal pro-arginine vasopressin (CT-proAVP), C-terminal endothelin-1 precursor fragment (CT-proET-1), midregional fragments of pro-atrial natriuretic peptide (MR-proANP) and pro-adrenomedullin (MR-proADM). RESULTS A total of 142 (56%) patients were diagnosed with vasovagal syncope (VVS), 85 (33%) with orthostatic hypotension (OH) and 47 (18%) with carotid sinus hypersensitivity (CSH); in addition, 74 (29%) patients had more than one diagnosis. Thirty-five patients (14%) demonstrated a cardioinhibitory reflex. The probability of VVS was highest in the first quartile of MR-proANP [Q1 vs. Q4: odds ratio (OR) 5.57, 95% confidence interval (CI) 1.86-16.74; P < 0.001] and CT-proET-1 (OR 7.17, 95% CI 2.43-21.13; P < 0.001). By contrast, the probability of OH was highest in the fourth quartile of CT-proET-1 (Q4 vs. Q1: OR 8.66, 95% CI 2.49-30.17; P < 0.001). Furthermore, CSH was most frequently observed in the first quartile of MR-proANP (Q1 vs. Q4: OR 6.57, 95% CI 1.62-26.62; P = 0.008) among those over 60 years of age, whereas the cardioinhibitory reflex was strongly associated with low CT-proET-1 levels (Q1 vs. Q4: OR 69.7, 95% CI 6.97-696.6; P < 0.001). Moreover, in patients with VVS, a high concentration of CT-proET-1 was predictive of OH (OR per 1 SD 2.4, 95% CI 1.15-5.02; P = 0.02), whereas low CT-proET-1 suggested involvement of the cardioinhibitory reflex (OR per 1SD 0.42, 95% CI 0.25-0.70; P = 0.001). CONCLUSIONS The levels of MR-proANP and CT-proET-1 are markedly changed in common forms of syncope, suggesting the involvement of novel neurohormonal mechanisms in syncopal attacks.
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Affiliation(s)
- A Fedorowski
- Department of Clinical Sciences, Lund University, Clinical Research Center, Malmö, Sweden.
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Abstract
The term "neurocardiology" refers to physiologic and pathophysiological interplays of the nervous and cardiovascular systems. This selective review provides an update about cardiovascular therapeutic implications of neurocardiology, with emphasis on disorders involving primary or secondary abnormalities of catecholamine systems. Concepts of scientific integrative medicine help understand these disorders. Scientific integrative medicine is not a treatment method or discipline but a way of thinking that applies systems concepts to acute and chronic disorders of regulation. Some of these concepts include stability by negative feedback regulation, multiple effectors, effector sharing, instability by positive feedback loops, allostasis, and allostatic load. Scientific integrative medicine builds on systems biology but is also distinct in several ways. A large variety of drugs and non-drug treatments are now available or under study for neurocardiologic disorders in which catecholamine systems are hyperfunctional or hypofunctional. The future of therapeutics in neurocardiology is not so much in new curative drugs as in applying scientific integrative medical ideas that take into account concurrent chronic degenerative disorders and interactions of multiple drug and non-drug treatments with each other and with those disorders.
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Affiliation(s)
- David S Goldstein
- Clinical Neurocardiology Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
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Hinghofer-Szalkay H, Lackner HK, Rössler A, Narath B, Jantscher A, Goswami N. Hormonal and plasma volume changes after presyncope. Eur J Clin Invest 2011; 41:1180-5. [PMID: 21434895 DOI: 10.1111/j.1365-2362.2011.02523.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Aim of this study was to test the hypothesis that after presyncope, some blood hormone pools increase while others decrease. MATERIALS AND METHODS In twelve healthy male adults, we determined plasma volume changes with plasma mass densitometry and hormone levels. The following were compared: supine rest, presyncope and 20-min post-presyncopal supine rest. We determined plasma renin activity (PRA), aldosterone, adrenocorticotropic hormone (ACTH), adrenomedullin and vasopressin (AVP) from venous blood samples. RESULTS Using passive 4-min 70° head-up tilt followed by 4-min sequences of additional lower body negative pressure of increasing intensity (15 mmHg steps), presyncope occurred after 11·6 ± 2·8 min, at which time plasma volume was reduced by 15·5 ± 7·4%, aldosterone increased by 37%, ACTH by 75%, PRA by 187% and AVP about 16-fold in average (all P < 0·01); no significant changes in adrenomedullin were seen. Twenty-min post-presyncope, ACTH increased above presyncopal levels (+36%, P < 0·05), aldosterone by 35% (P = 0·07). PRA (-47%, P < 0·01) and AVP (-84%, P < 0·05) decreased below presyncopal but were still above supine control (P < 0·01); similarly, plasma density fell by 2·17 ± 0·97 g L(-1) below presyncopal (P < 0·01), but above supine control (P < 0·05), indicating rapid recovery (83% of initial plasma volume). CONCLUSIONS We conclude that during the 20-min supine post-syncopal period, plasma volume, PRA and AVP return closer to baseline but aldosterone and ACTH continue increasing. The magnitude of observed concentration changes cannot be explained by haemoconcentration/haemodilution, rather it appears that the observed changes are indicative of hormone-specific endocrine activation patterns in the recovery phase.
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Wieling W, Rozenberg J, Go-Schön IK, Karemaker JM, Westerhof BE, Jardine DL. Hemodynamic mechanisms underlying prolonged post-faint hypotension. Clin Auton Res 2011; 21:405-13. [PMID: 21796352 PMCID: PMC3210950 DOI: 10.1007/s10286-011-0134-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Accepted: 06/09/2011] [Indexed: 11/29/2022]
Abstract
OBJECTIVE During hypotension induced by tilt-table testing, low presyncopal blood pressure (BP) usually recovers within 1 min after tilt back. However, in some patients prolonged post faint hypotension (PPFH) is observed. We assessed the hemodynamics underlying PPFH in a retrospective study. METHODS Seven patients (2 females, aged 31-72 years) experiencing PPFH were studied. PPFH was defined as a systolic BP below 85 mmHg for at least 2 min after tilt back. In 6 out of 7 presyncope was provoked by 0.4 mg sublingual NTG, administered in the 60° head-up tilt position following head-up tilt for 20 min. Continuous BP was monitored and stroke volume (SV) was computed from pressure pulsations. Cardiac output (CO) was calculated from SV × heart rate (HR); and total peripheral resistance (TPR) from mean BP/CO. Left ventricular contractility was estimated by dP/dt (max) of finger pressure pulse. RESULTS Systolic BP (SYS), diastolic BP (DIAS) and HR during PPFH were lower compared to baseline: SYS 75 ± 14 versus 121 ± 18 mmHg, DIAS 49 ± 9 versus 71 ± 9 mmHg and HR 52 ± 14 versus 67 ± 12 beats/min (p < 0.05). Marked hypotension was associated with a 47% fall in CO 3.1 ± 0.6 versus 5.9 ± 1.3 L/min (p < 0.05) and decreases in dP/dt, 277 ± 77 versus 759 ± 160 mmHg/s (p < 0.05). The difference in TPR was not significant 1.1 ± 0.3 versus 1.0 ± 0.3 MU (p = 0.229). In four patients, we attempted to treat PPFH by 30° head-down tilt. This intervention increased SYS only slightly (to 89 ± 12 mmHg). INTERPRETATION PPFH seems to be mediated by severe cardiac depression.
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Affiliation(s)
- Wouter Wieling
- Department of Medicine, Academic Medical Centre, University of Amsterdam, The Netherlands.
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Olde Nordkamp LRA, Wieling W, Zwinderman AH, Wilde AAM, van Dijk N. Genetic aspects of vasovagal syncope: a systematic review of current evidence. Europace 2009; 11:414-20. [PMID: 19153089 DOI: 10.1093/europace/eun387] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Knowledge on the aetiology of vasovagal syncope (VVS) is of great importance to optimize its diagnostic and therapeutic options. To unravel the largely unknown pathophysiology, studies on genetic aspects of VVS can be of use. This systematic review on all available literature aims to provide an overview of the current knowledge of VVS genetics. The MEDLINE and EMBASE database were systematically searched for all studies discussing genetic factors as a cause of VVS. Hereditary aspects of VVS were studied in 19 studies. Six studies determined a positive family history in, respectively, 19-90% of the VVS patients. These numbers, however, are not higher than the cumulative incidence of VVS in the general population (35-39%). Four studies examined potential genetic polymorphisms associated with VVS. Only a Gly389 allele was more frequently present in VVS patients with a positive HUT test, although the significance level was set much higher than usual in genetic studies, and this result has not been replicated so far. Knowledge on genetic aspects of VVS could be very useful in clinical practice and research, but the current evidence that it has a genetic basis is not very strong.
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Eldadah BA, Pechnik SL, Holmes CS, Moak JP, Saleem AM, Goldstein DS. Failure of propranolol to prevent tilt-evoked systemic vasodilatation, adrenaline release and neurocardiogenic syncope. Clin Sci (Lond) 2007; 111:209-16. [PMID: 16634720 DOI: 10.1042/cs20060017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In patients with neurocardiogenic syncope, head-up tilt often evokes acute loss of consciousness accompanied by vasodilatation, increased plasma adrenaline and systemic hypotension. Since hypotension increases adrenaline levels and adrenaline can produce skeletal muscle vasodilatation by activating beta2 receptors, adrenaline might induce a positive feedback loop precipitating circulatory collapse. We hypothesized that propranolol, a non-selective beta-blocker, would prevent adrenaline-induced vasodilatation and thereby prevent syncope. Eight subjects with recurrent neurocardiogenic syncope and previously documented tilt-induced syncope with elevated plasma adrenaline levels participated in the present study. Subjects underwent tilt table testing after receiving oral propranolol or placebo in a double-blind randomized crossover fashion. Haemodynamic and neurochemical variables were measured using intra-arterial monitoring, impedance cardiography, arterial blood sampling and tracer kinetics of simultaneously infused [3H]noradrenaline and [3H]adrenaline. The occurrence of tilt-induced neurally mediated hypotension and syncope, duration of tilt tolerance, extent of the decrease in SVRI (systemic vascular resistance index) and magnitude of plasma adrenaline increases did not differ between the propranolol and placebo treatment phases. SVRI was inversely associated with fractional increase in plasma adrenaline during both phases. One subject did not faint when on propranolol; this subject's response is discussed in the context of central effects of propranolol. In this small, but tightly controlled, study, propranolol did not prevent tilt-induced vasodilatation, syncope or elevated plasma adrenaline.
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Affiliation(s)
- Basil A Eldadah
- Clinical Neurocardiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892-1620, USA.
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Mitro P, Hijová E. Myocardial Contractility and Cardiac Filling Measured by Impedance Cardiography in Patients with Nitroglycerine-Induced Vasovagal Syncope. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2006; 29:1-8. [PMID: 16441710 DOI: 10.1111/j.1540-8159.2006.00299.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Increased myocardial contractility and inadequate cardiac filling leading to activation of the Bezold-Jarisch reflex were proposed as possible triggering mechanisms of vasovagal syncope (VVS). In the present study noninvasive hemodynamic measurements were performed in order to examine the role of myocardial contractility and cardiac filling in pathogenesis of VVS. METHODS Hemodynamic parameters were measured during head-up tilt test (HUT) by impedance cardiography in 46 patients with unexplained syncope. Myocardial contractility was measured as index of contractility (IC), acceleration index (ACI), and ejection fraction (EF). Afterload was measured as systemic vascular resistance index (SVRI) and preload was expressed as end-diastolic index (EDI). Serial measurements were done 1 minute before HUT, during HUT at 1-minute intervals, and 1 minute after completion of HUT. RESULTS HUT was positive in 30 patients (10 men, 20 women, mean age 36 +/- 16 years) and negative in 16 patients (8 men, 8 women, mean age 31 +/- 14 years). No significant differences were observed between HUT(+) and HUT(-) groups in hemodynamic parameters at supine rest and during HUT until the development of syncope. SVRI was lower in HUT(+) than in HUT(-) group at syncope (122.7 + 66.3 vs 185.6 + 51.4 dyn sec cm(-5)/m2, P = 0.002) and after syncope (117.0 + 61.1 vs 198.0 + 95.7 dyn sec cm(-5)/m2, P = 0.007). ACI, IC, EF, and EDI did not differ between groups at syncope. After syncope EF was higher in HUT(+) group compared to HUT(-) group (59.2 + 6.1 vs 52.7 + 9.4%, P = 0.02). CONCLUSION The role of increased myocardial contractility and decreased cardiac filling is not confirmed in the present study.
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Affiliation(s)
- Peter Mitro
- Third Clinic of Internal Medicine, Kossice, Slovakia.
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Affiliation(s)
- Arnaud J J Aerts
- Department of Cardiology, Atrium Medisch Centrum Heerlen, the Netherlands.
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Bondanelli M, Alboni P, Margutti A, Franceschetti P, Dinelli M, Gruppillo P, Marchi P, degli Uberti EC. Plasma galanin response to head-up tilt in normal subjects and patients with recurrent vasovagal syncope. Metabolism 2003; 52:315-21. [PMID: 12647269 DOI: 10.1053/meta.2003.50051] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Neurohumoral factors may contribute to cardiovascular changes associated with vasovagal syncope (VVS). Galanin (GAL) is a neuropeptide, widely distributed in the central and peripheral nervous systems, that interacts with both sympathetic and vagal systems as well as with neurotransmitters, such as serotonin. We investigated the changes in plasma GAL and catecholamine levels during head-up tilt (HUT) test in patients with recurrent VVS. Twenty-two patients (11 women, aged 33.1 +/- 4.2 years) with a history of VVS and 10 healthy subjects (5 women, aged 38.0 +/- 5.8 years) underwent HUT test (60 degrees, 45 minutes). GAL and catecholamine plasma levels were measured in the supine position, during HUT and, in patients with positive response, at presyncope, syncope, and after recovery of consciousness. Thirteen patients developed syncope during HUT, whereas no healthy subjects had a positive response. In healthy subjects, GAL did not change during HUT. By contrast, in patients with a history of VVS and a negative response to tilting (no syncope), GAL significantly (P <.001) increased in response to tilting (supine, 10.2 +/- 0.6 pmol/L; tilting, 18.1 +/- 1.1 pmol/L at 45 minutes) and correlated positively with the increases in blood pressure (BP) and heart rate (HR). In patients with a positive response, GAL did not change either before the loss of consciousness or during syncope. In patients with a positive response, norepinephrine (NE) significantly (P <.001) increased during tilting and then remained practically unchanged during syncope, whereas epinephrine (E) significantly (P <.001) increased during tilting and then showed further significant increases at presyncope and syncope. In conclusion, this study shows that circulating GAL levels progressively increase in correlation with the cardiovascular parameters during a negative HUT in patients with a history of VVS, whereas they remain unchanged in healthy subjects. Moreover, in the patients with tilting-induced syncope GAL does not change either before or during loss of consciousness. These data suggest a role for endogenous GAL in the adaptive responses to acute orthostatic stress preventing syncope in susceptible individuals.
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Affiliation(s)
- Marta Bondanelli
- Department of Biomedical Sciences and Advanced Therapies, Section of Endocrinology, University of Ferrara, Ferrara, Italy
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Theopistou A, Gatzoulis K, Economou E, Sideris S, Hantzos K, Stefanadis C, Toutouzas P. Biochemical changes involved in the mechanism of vasovagal syncope. Am J Cardiol 2001; 88:376-81. [PMID: 11545757 DOI: 10.1016/s0002-9149(01)01682-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Vasovagal syncope elicits one of the most powerful transient vasodilatory responses in humans. Many studies have shown an altered neurohumoral response to tilting in patients with vasovagal syncope. Vasopressin (VP) has been of particular interest, but its exact role remains unclarified, whereas the possible role of the potent vasoactive end products of arachidonic acid metabolism has not yet been addressed. We determined the changes in plasma levels of VP, thromboxane (TXA2), and prostacyclin (PGI2) in 34 syncopal patients undergoing a standardized head-up tilt-table testing protocol and compared these changes between patients with positive and negative test results. Blood samples were collected at baseline, 15 minutes in the head-up position, and at the termination of the tilt test (the induction of syncope or the completion of a negative test). Sixteen patients had a positive test result, whereas 18 completed the test without developing any syncopal symptoms. In the tilt-positive group, VP levels presented a 20-fold increase at the time of syncope when compared with baseline levels (p = 0.0000), without any increase at earlier stages. No change was detected at any stage in the tilt-negative patients. We did not find any difference in the levels of PGI2 at any stage in any group of patients or between the 2 groups. TXA2 levels increased significantly at 15 minutes in the upright position in both tilt-positive and tilt-negative patients. No further increase was noticed at the time of syncope in the tilt-positive group, whereas in patients with a negative test result, there was a tendency to decline at the time of the test's completion. It is concluded that although VP is markedly increased during tilt-induced vasovagal syncope, vasoactive amines such as TXA2 and PGI2 play a minor role in the vasodilatory component of the response.
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Affiliation(s)
- A Theopistou
- Department of Cardiology, Hippokration Hospital, University of Athens, Athens, Greece.
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Takei A, Ohnishi Y, Yokoyama M. Elevated parasympathetic nerve tone in isoproterenol-induced neurally mediated syncope during head-up tilt testing. JAPANESE CIRCULATION JOURNAL 2001; 65:320-4. [PMID: 11316131 DOI: 10.1253/jcj.65.320] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To clarify the autonomic nerve mechanisms whereby isoproterenol induces vasovagal reaction, 32 patients with recurrent syncopal episodes of unknown origin underwent head-up tilt testing. Syncope was induced in 11 patients by a control tilt (control/+ group). The remaining 21 patients (control/- group) underwent the procedure during isoproterenol infusion. Syncope was induced in 13 (isoproterenol/+ group), but not in the remaining 8 patients (isoproterenol/- group). High-frequency component (HF) and low-frequency component (LF)/HF, which are indices of heart rate variability, were assessed for 2-min intervals at baseline (T1) during the initial phase (T2) and at the end (T3) of tilting in each test. The ratios of HF and LF/HF at T2/T1 and T3/T2 were calculated. The HF value at T3 in the control/+ group was greater than that in the control/- group (1.47+/-0.91 vs 0.75+/-0.34; p<0.05). The HF value at T3 in the isoproterenol/+ group was significantly greater than those in the isoproterenol/- group (1.19+/-1.04 vs 0.43+/-0.23; p<0.05). The HF value at T2 in the isoproterenol/+ tended to be greater than in the isoproterenol/- group (1.30+/-0.85 vs 0.66+/-0.53; p=0.07). The ratio of HF for T2/T1 in isoproterenol/+ was greater than in the other groups (2.04+/-1.26 in isoproterenol/+ vs 0.58+/-0.39 in control/-, 0.47+/-0.18 in control/+ and 0.71+/-0.45 in isoproterenol/-; p=0.0001), whereas that of HF for T3/T2 in the control/+ group was greater than in the other groups (1.48+/-0.62 in control/+ vs 0.97+/-0.33 in control/-; p<0.05, 0.79+/-0.35 in isoproterenol/- and 0.88+/-0.37 in isoproterenol/+; p<0.01). No difference was observed in either LF/HF or the ratio of LF/HF among the groups. The early and persistent increase in parasympathetic nerve tone provoked by isoproterenol plays an important role in enhancing the vasovagal reaction during head-up tilt testing.
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Affiliation(s)
- A Takei
- First Department of Internal Medicine, Kobe University School of Medicine, Japan
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Greenleaf JE, Petersen TW, Gabrielsen A, Pump B, Bie P, Christensen NJ, Warberg J, Videbaek R, Simonson SR, Norsk P. Low LBNP tolerance in men is associated with attenuated activation of the renin-angiotensin system. Am J Physiol Regul Integr Comp Physiol 2000; 279:R822-9. [PMID: 10956239 DOI: 10.1152/ajpregu.2000.279.3.r822] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Plasma vasoactive hormone concentrations [epinephrine (p(Epi)), norepinephrine (p(NE)), ANG II (p(ANG II)), vasopressin (p(VP)), endothelin-1 (p(ET-1))] and plasma renin activity (p(RA)) were measured periodically and compared during lower body negative pressure (LBNP) to test the hypothesis that responsiveness of the renin-angiotensin system, the latter being one of the most powerful vasoconstrictors in the body, is of major importance for LBNP tolerance. Healthy men on a controlled diet (2,822 cal/day, 2 mmol. kg(-1). day(-1) Na(+)) were exposed to 30 min of LBNP from -15 to -50 mmHg. LBNP was uneventful for seven men [25 +/- 2 yr, high-tolerance (HiTol) group], but eight men (26 +/- 3 yr) reached presyncope after 11 +/- 1 min [P < 0.001, low-tolerance (LoTol) group]. Mean arterial pressure (MAP) did not change measurably, but central venous pressure and left atrial diameter decreased similarly in both groups (5-6 mmHg, by approximately 30%, P < 0.05). Control (0 mmHg LBNP) hormone concentrations were similar between groups, however, p(RA) differed between them (LoTol 0.6 +/- 0.1, HiTol 1.2 +/- 0.1 ng ANG I. ml(-1). h(-1), P < 0.05). LBNP increased (P < 0. 05) p(RA) and p(ANG II), respectively, more in the HiTol group (9.9 +/- 2.2 ng ANG I. ml(-1). h(-1) and 58 +/- 12 pg/ml) than in LoTol subjects (4.3 +/- 0.9 ng ANG I. ml(-1). h(-1) and 28 +/- 6 pg/ml). In contrast, the increase in p(VP) was higher (P < 0.05) in the LoTol than in the HiTol group. The increases (P < 0.05) for p(NE) were nonsignificant between groups, and p(ET-1) remained unchanged. Thus there may be a causal relationship between attenuated activation of p(RA) and p(ANG II) and presyncope, with p(VP) being a possible cofactor. Measurement of resting p(RA) may be of predictive value for those with lower hypotensive tolerance.
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Affiliation(s)
- J E Greenleaf
- Danish Aerospace Medical Centre of Research and Clinic of Aviation Medicine, Rigshospitalet; DK-2200 Copenhagen, Denmark.
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Jardine DL, Melton IC, Bennett SI, Crozier IG, Donaldson IM, Ikram H. Baroreceptor denervation presenting as part of a vagal mononeuropathy. Clin Auton Res 2000; 10:69-75. [PMID: 10823338 DOI: 10.1007/bf02279894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A 48-year-old woman presented with a history of progressive cough, dysphonia, dysphagia, and postural symptoms. Subsequent neurological investigations were consistent with a bilateral vagal mononeuropathy, and neurosarcoidosis was diagnosed after scalene node biopsy. Autonomic investigations including microneurography, neurohormones, and heart rate variability demonstrated arterial and cardiopulmonary baroreflex failure. In addition, parasympathetic control of heart rate was absent and consistent with a bilateral, nonselective lesion in the proximal vagus.
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Affiliation(s)
- D L Jardine
- Cardiology Department, Christchurch Hospital, New Zealand.
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Ruiz GA, Madoery C, Arnaldo F, Menéndez C, Tentori MC. Frequency-domain analysis of heart rate variability during positive and negative head-up tilt test: importance of age. Pacing Clin Electrophysiol 2000; 23:325-32. [PMID: 10750132 DOI: 10.1111/j.1540-8159.2000.tb06757.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The study of autonomic behavior during a head-up tilt test (HUT) has been deemed important to understand the loss of consciousness mechanism. Though HRV in patients with HUT(+) and HUT(-) has been compared, few trials emphasized the importance of age. HRV in frequency domain was analyzed based on 5-minute samples in the supine position, and between 5 and 10 minutes during early tilt test (R1) in 102 patients with one or more episodes of syncope (mean age 44.3 +/- 20.8, range 15-85 years, 55 women). Two subgroups were selected afterwards: (1) young patients between 15 and 35 years of age (41 patients) and (2) elderly patients aged 60 or more (36 patients). The following parameters were taken into account: the sum of low (LF) and high frequency (HF) (LF and HF in absolute values and in normalized units), the LF/HF ratio (L/H ratio), and the percentage of change between baseline and R1 values. The HRV behavior in young and elderly patients with positive and negative HUT was established. We then analyzed the correlation between HRV and age and HUT outcome. A multiple regression analysis encompassing age, HUT outcome, gender, and number of syncope episodes was performed. In young patients, the LF and HF areas and the L/H ratio changed significantly between baseline and R1. The L/H ratio increases from baseline to R1. Conversely, these differences were not significant in the elderly. No differences between HUT(+) and HUT(-) within the same age group were observed. Age related significantly to practically all HRV parameters analyzed, whereas the tilt test outcome correlates poorly with HF normalized units and LF normalized units during R1, and the L/H ratio changes between baseline and R1. By means of a multivariate analysis, only age shows a significant correlation with the HRV values. Despite an all age triggering of vasovagal syncope during HUT, the young and elderly patients' autonomic behavior differs. The young considerably increase their sympathovagal balance during HUT, whereas the elderly have a mitigated autonomic response. No significant differences were observed during the first minutes of the test between those with a HUT(+) and those with a HUT(-) within the same age group. Age, and not the HUT response, is the major determinant of the autonomic behavior during early HUT.
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Affiliation(s)
- G A Ruiz
- Cardiology Division, Hospital de Agudos Juan A. Fernández, Buenos Aires, Argentina.
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Jardine DL, Ikram H, Frampton CM, Frethey R, Bennett SI, Crozier IG. Autonomic control of vasovagal syncope. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 274:H2110-5. [PMID: 9841538 DOI: 10.1152/ajpheart.1998.274.6.h2110] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the pathophysiological study of vasovagal syncope, the nature of the interaction between baroreceptor sensitivity (BS), sympathetic withdrawal, and parasympathetic activity has yet to be ascertained. Altered BS may predispose toward abnormal sympathetic and parasympathetic responses to orthostasis, causing hypotension that may progress to syncope if there is sympathetic withdrawal. To examine this hypothesis, we monitored blood pressure (BP), heart rate (HR), BS, forearm blood flow, and muscle nerve sympathetic activity (MNSA) continuously in 18 vasovagal patients during 60 degrees head-up tilt, syncope, and recovery. Results were compared with those of 17 patients who were able to tolerate tilt for 45 min. During early tilt, BP was maintained in both groups by an increase in HR and MNSA from baseline (P < 0.01), but BS decreased more in the syncopal group (P < 0.05). At the start of presyncope (mean 2.7 +/- 0.2 min before syncope and 15.2 +/- 12 min after tilt), when BP fell, HR and sympathetic activity remained increased from baseline (P < 0.01). Thereafter, BP and HR correlated directly with sympathetic activity and regressed in linear fashion until syncope (P < 0.001), whereas BS increased to baseline. At syncope, BP, HR, and sympathetic activity fell below baseline (P < 0.01, P < 0.05, and P < 0.01, respectively), but BS did not increase. During recovery, sympathetic activity increased to baseline and BS increased (P < 0.05), whereas HR and BP remained low (P < 0.01 and P < 0.05, respectively). The mechanism for the initiation of hypotension during presyncope remains unknown, but BS may contribute. Vasodilatation and bradycardia during presyncope appear to be more closely related to withdrawal of sympathetic activity than to increased parasympathetic cardiac activity.
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Affiliation(s)
- D L Jardine
- Department of Cardiology, Christchurch Hospital, Christchurch, New Zealand
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