1
|
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.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Cuifen Zhao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, China
| |
Collapse
|
2
|
Snapper H, Cheshire WP. Oral and intravenous hydration in the treatment of orthostatic hypotension and postural tachycardia syndrome. Auton Neurosci 2022; 238:102951. [PMID: 35123367 DOI: 10.1016/j.autneu.2022.102951] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 12/07/2021] [Accepted: 01/25/2022] [Indexed: 01/21/2023]
Abstract
Hydration with water and salt is the mainstay of treatment for autonomic nervous system disorders that impair orthostatic tolerance. The goal is to expand intravascular volume to compensate for the downward displacement of blood volume that occurs when standing and thereby sustain cerebral perfusion and restore quality of life. Despite strong consensus recommendations for salt supplementation as standard treatment of these disorders, published evidence of benefit is relatively weak, and no randomized clinical trials have occurred. This review summarizes the physiological rationale for hydration and evaluates the literature on oral and intravenous hydration in the treatment of neurogenic orthostatic hypotension, postural tachycardia syndrome, and recurrent vasovagal syncope. We conclude that oral salt replacement is indicated for treatment of neurogenic orthostatic hypotension because these patients have excessive renal sodium excretion, and for treatment of chronic orthostatic intolerance because these patients are often hypovolemic. As not all patients are able to tolerate sufficient oral hydration, there is also a role for intravenous volume-loading in severe cases of postural tachycardia syndrome. We offer guidance, based on review of the literature and the clinical judgment of a cardiologist and neurologist with experience treating autonomic disorders, regarding the option of ongoing intravenous hydration for treatment of severe, refractory cases of postural tachycardia syndrome.
Collapse
Affiliation(s)
- Howard Snapper
- Department of Cardiology, Wellstar Healthcare System, Marietta, GA 30060, USA.
| | - William P Cheshire
- Division of Autonomic Disorders, Department of Neurology, Mayo Clinic, Jacksonville, FL 32224, USA
| |
Collapse
|
3
|
Williams EL, Raj SR, Schondorf R, Shen WK, Wieling W, Claydon VE. Salt supplementation in the management of orthostatic intolerance: Vasovagal syncope and postural orthostatic tachycardia syndrome. Auton Neurosci 2021; 237:102906. [PMID: 34823150 DOI: 10.1016/j.autneu.2021.102906] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 09/23/2021] [Accepted: 11/06/2021] [Indexed: 02/07/2023]
Abstract
Salt supplementation is a common non-pharmacological approach to the management of recurrent orthostatic syncope or presyncope, particularly for patients with vasovagal syncope (VVS) or postural orthostatic tachycardia syndrome (POTS), although there is limited consensus on the optimal dosage, formulation and duration of treatment. Accordingly, we reviewed the evidence for the use of salt supplementation to reduce susceptibility to syncope or presyncope in patients with VVS and POTS. We found that short-term (~3 months) salt supplementation improves susceptibility to VVS and associated symptoms, with little effect on supine blood pressure. In patients with VVS, salt supplementation is associated with increases in plasma volume, and an increase in the time taken to provoke a syncopal event during orthostatic tolerance testing, with smaller orthostatic heart rate increases, enhanced peripheral vascular responses to orthostatic stress, and improved cerebral autoregulation. Responses were most pronounced in those with a baseline sodium excretion <170 mmol/day. Salt supplementation also improved symptoms, plasma volume, and orthostatic responses in patients with POTS. Salt supplementation should be considered for individuals with recurrent and troublesome episodes of VVS or POTS without cardiovascular comorbidities, particularly if their typical urinary sodium excretion is low, and their supine blood pressure is not elevated. The efficacy of the response, in terms of the improvement in subjective and objective markers of orthostatic intolerance, and any potential deleterious effect on supine blood pressure, should be routinely monitored in individuals on high salt regimes.
Collapse
Affiliation(s)
- E L Williams
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - S R Raj
- Department of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - R Schondorf
- Department of Neurology, Jewish General Hospital, McGill University, Montreal, Quebec, Canada
| | - W K Shen
- Department of Cardiovascular Diseases, Mayo Clinic Arizona, Phoenix, AZ, United States
| | - W Wieling
- Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - V E Claydon
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.
| |
Collapse
|
4
|
Ballantyne BA, Letourneau-Shesaf S, Raj SR. Management of vasovagal syncope. Auton Neurosci 2021; 236:102904. [PMID: 34763249 DOI: 10.1016/j.autneu.2021.102904] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/27/2021] [Accepted: 11/01/2021] [Indexed: 10/19/2022]
Abstract
Vasovagal syncope (VVS) is a very common form of fainting. Treatment begins with patient education about the mechanism of fainting, and the non-lethal nature of vasovagal syncope. In this article, we review several non-pharmacological approaches that form the foundation of our current treatments. These include increases in dietary salt and water intake, the use of compression garments, physical counter-maneuvers and tilt-training. When these approaches are inadequate, medications can sometimes be effective. While the evidence base for the pharmacological treatment of VVS is modest, recent trial data have found drugs to be useful in placebo-controlled randomized trials. For select patients, and those patients more refractory to medications, procedural treatments may be an option. In this review, we discuss the current state of evidence for the non-pharmacological and pharmacological treatments for VVS, as well as some novel, emerging therapies for VVS.
Collapse
Affiliation(s)
- Brennan A Ballantyne
- Department of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Sevan Letourneau-Shesaf
- Department of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Satish R Raj
- Department of Cardiac Sciences, Libin Cardiovascular Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada; Autonomic Dysfunction Center, Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
| |
Collapse
|
5
|
Wang Y, Wang Y, Li X, Du J, Zhang H, Jin H, Liao Y. Efficacy of Increased Salt and Water Intake on Pediatric Vasovagal Syncope: A Meta-Analysis Based on Global Published Data. Front Pediatr 2021; 9:663016. [PMID: 34055695 PMCID: PMC8155624 DOI: 10.3389/fped.2021.663016] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/12/2021] [Indexed: 11/23/2022] Open
Abstract
Objective: This study was designed to assess the efficacy of increased salt and water intake in the treatment of pediatric vasovagal syncope (VVS) based on a meta-analysis of global data. Methods: Following the established inclusion criteria, seven databases, Cochrane Library, EMBASE, PubMed, Web of Science, VIP, Wanfang, and China National Knowledge Infrastructure (CNKI), were searched using specific terms. The Cochrane Bias risk assessment tool was used as a quality assessment tool of the included studies, and publication bias was assessed by funnel plots. Review Manager 5.4 software was used to analyze the efficacy of the included studies, taking the negative changing rate of the head-up tilt test (HUTT) and recurrence rate of syncope or presyncope as therapeutic efficacy evaluations. Results: In total, 5 randomized controlled trials (RCTs) were finally obtained, using the negative changing rate of the HUTT as an efficacy evaluation, while in 4 of the studies, the recurrence rate of syncope or presyncope was also evaluated. A total of 233 children with VVS were included in the salt and water intervention group. The cases in the control group were treated with non-medicinal conventional therapy. The results revealed that the negative changing rate of the HUTT in the intervention group (144/233, 61.8%) was higher than that in the control group (48/179, 26.8%), and the difference was significant (P < 0.00001). The recurrence rate of syncope or presyncope in the intervention group (85/195, 43.6%) was lower than that in the control group (86/144, 59.7%), and the difference was significant (P = 0.002). Conclusion: The current findings suggest that increased salt and water intake may increase the negative changing rates of the HUTT and reduce syncope or presyncope recurrence rates in pediatric patients with VVS.
Collapse
Affiliation(s)
- Yaru Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Yuanyuan Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Xueying Li
- Department of Medical Statistics, Peking University First Hospital, Beijing, China
| | - Junbao Du
- Department of Pediatrics, Peking University First Hospital, Beijing, China
- Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education, Beijing, China
| | - Hao Zhang
- Department of Cardiothoracic Surgery, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hongfang Jin
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Ying Liao
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| |
Collapse
|
6
|
Loughlin EA, Judge CS, Gorey SE, Costello MM, Murphy RP, Waters RF, Hughes DS, Kenny RA, O'Donnell MJ, Canavan MD. Increased Salt Intake for Orthostatic Intolerance Syndromes: A Systematic Review and Meta-Analysis. Am J Med 2020; 133:1471-1478.e4. [PMID: 32603788 DOI: 10.1016/j.amjmed.2020.05.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 05/04/2020] [Accepted: 05/04/2020] [Indexed: 10/24/2022]
Abstract
BACKGROUND Guidelines recommend increased salt intake as a first-line recommendation in the management of symptomatic orthostatic hypotension and recurrent syncope. There have been no systematic reviews of this intervention. We sought to summarize the evidence for increased salt intake in patients with orthostatic intolerance syndromes. METHODS We conducted a systematic review and meta-analysis of studies in PubMed, EMBASE, and CINAHL. Interventional studies that increased salt intake in individuals with orthostatic intolerance syndromes were included. Primary outcome measures included incidence of falls and injuries, and rates of syncope and presyncope. Secondary outcome measures included other orthostatic intolerance symptoms, blood pressure, and heart rate. RESULTS A total of 14 studies were eligible, including participants with orthostatic hypotension, syncope, postural orthostatic tachycardia syndrome, and idiopathic orthostatic tachycardia (n = 391). Mean age was 35.6 (± 15) years. All studies were small and short-term (<60 mins-90 days). No study reported on the effect of increased salt intake on falls or injuries. Meta-analysis demonstrated that during head-up tilt, mean time to presyncope with salt intake increased by 1.57 minutes (95% confidence interval [CI], 1.26-1.88), mean systolic blood pressure increased by 12.27 mm Hg (95% CI, 10.86-13.68), and mean heart rate decreased by -3.97 beats per minute (95% CI, -4.08 to -3.86), compared with control. Increased salt increased supine blood pressure by 1.03 mm Hg (95% CI, 0.81 to 1.25). Increased salt intake resulted in an improvement or resolution of symptoms in 62.3% (95% CI, 51.6 to 72.6) of participants in short-term follow-up studies (mean follow-up of 44.3 days, 6 studies; n=91). Methodological quality of studies were low with high statistical heterogeneity in all meta-analyses. CONCLUSIONS Our meta-analysis provides low-quality evidence of a short-term improvement in orthostatic intolerance with increased salt intake. There were no clinical trials demonstrating the efficacy and safety of increased salt intake on long-term clinical outcomes. Overall, there is a paucity of clinical trial evidence to support a cornerstone recommendation in the management of orthostatic intolerance syndromes.
Collapse
Affiliation(s)
- Elaine A Loughlin
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland.
| | - Conor S Judge
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland; Wellcome Trust - HRB, Irish Clinical Academic Training, Dublin, Ireland
| | - Sarah E Gorey
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Maria M Costello
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Robert P Murphy
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Ruairi F Waters
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Diarmaid S Hughes
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Rose Ann Kenny
- Mercer's Institute for Successful Ageing, St. James's Hospital, Dubline, Ireland
| | - Martin J O'Donnell
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| | - Michelle D Canavan
- HRB-Clinical Research Facility, National University of Ireland Galway, Galway, Ireland; Galway University Hospital, Newcastle Road, Galway, Ireland
| |
Collapse
|
7
|
Treatment Updates in Postural Tachycardia Syndrome. Curr Treat Options Neurol 2020. [DOI: 10.1007/s11940-020-00643-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
Medow MS, Guber K, Chokshi S, Terilli C, Visintainer P, Stewart JM. The Benefits of Oral Rehydration on Orthostatic Intolerance in Children with Postural Tachycardia Syndrome. J Pediatr 2019; 214:96-102. [PMID: 31405524 PMCID: PMC6815702 DOI: 10.1016/j.jpeds.2019.07.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 07/11/2019] [Accepted: 07/15/2019] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To evaluate whether equal volumes of oral rehydration solution (ORS) or intravenous (IV) saline provide similar improvements in cardiovascular status during controlled orthostatic challenge when administered to subjects with postural tachycardia syndrome (POTS) with orthostatic intolerance. STUDY DESIGN We studied the neurovascular response to fluid loading during orthostatic stress using lower body negative pressure (LBNP) in 10 subjects with POTS with orthostatic intolerance and 15 controls, and on subsequent days before and 1 hour after IV saline infusion or ingestion of ORS. RESULTS Subjects with POTS exhibited reduced tolerance to LBNP (P < .0001) compared with controls (Orthostatic Index of 35 715 ± 3469 vs 93 980 ± 7977, respectively). In POTS, following ORS but not saline infusion, cerebral blood flow velocity (CBFv) was significantly higher than that with no treatment, at -45 mm Hg (P < .0005). Although fluid loading did not confer any advantage in controls, subjects with POTS experienced a significant improvement in orthostatic tolerance following both saline infusion (100 ± 9.7 vs 134.5 ± 17.4; P < .05) and ORS (100 ± 9.7 vs 155.6 ± 15.7; P < .001) when evaluated by normalized orthostatic index (P < .001, compared with untreated baseline). CONCLUSIONS Maintenance of CBFv may have resulted in the improved short-term orthostatic tolerance exhibited by the subjects with POTS following ORS administration. ORS is a convenient, safe, and effective therapy for short-term relief of orthostatic intolerance.
Collapse
Affiliation(s)
- Marvin S Medow
- Department of Pediatrics, New York Medical College, Valhalla, NY; Department of Physiology, New York Medical College, Valhalla, NY.
| | | | | | - Courtney Terilli
- Department of Pediatrics, New York Medical College, Valhalla, NY
| | - Paul Visintainer
- Department of Epidemiology and Biostatistics, Baystate Medical Center, University of Massachusetts School of Medicine, Worcester, MA
| | - Julian M Stewart
- Department of Pediatrics, New York Medical College, Valhalla, NY; Department of Physiology, New York Medical College, Valhalla, NY
| |
Collapse
|
9
|
Wells R, Elliott AD, Mahajan R, Page A, Iodice V, Sanders P, Lau DH. Efficacy of Therapies for Postural Tachycardia Syndrome: A Systematic Review and Meta-analysis. Mayo Clin Proc 2018; 93:1043-1053. [PMID: 29937049 DOI: 10.1016/j.mayocp.2018.01.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 01/04/2018] [Accepted: 01/16/2018] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To identify the evidence base and evaluate the efficacy of each treatment for postural tachycardia syndrome (POTS) in light of a recent consensus statement highlighting the lack of treatment options with clear benefit to risk ratios for this debilitating condition. METHODS The CENTRAL (Cochrane Central Register of Controlled Trials), PubMed, and Embase databases from inception to May 2017 were searched using the terms postural AND tachycardia AND syndrome. A total of 135 full-text publications were screened after excluding duplicates (n=681), conference abstracts (n=467), and records that did not relate to POTS therapy (n=876). We included 28 studies with at least 4 patients with POTS in which symptomatic response was reported after more than 4 weeks of therapy. This review was performed according to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) statement. Two investigators independently performed the data extraction and evaluated the quality of evidence. RESULTS This study comprised 25 case series and 3 small randomized controlled trials that evaluated 755 and 103 patients with POTS, respectively. Interventions directed at increasing intravascular volume, increasing peripheral or splanchnic vascular tone, controlling heart rate, and increasing exercise tolerance demonstrate moderate efficacy (range, 51%-72%). Few data exist on their comparative effectiveness. Significant heterogeneities were seen in terms of patient age, symptom severity, and the measures used to evaluate treatment efficacy. CONCLUSION The current evidence base to guide optimal management of patients with POTS is extremely limited. More high-quality collaborative research with standardized reporting of symptom response and treatment tolerability is urgently needed.
Collapse
Affiliation(s)
- Rachel Wells
- Centre for Heart Rhythm Disorders, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia; Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Adrian D Elliott
- Centre for Heart Rhythm Disorders, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia
| | - Rajiv Mahajan
- Centre for Heart Rhythm Disorders, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia; Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Amanda Page
- Centre for Nutrition and Gastrointestinal Diseases, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia
| | - Valeria Iodice
- University College London, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Prashanthan Sanders
- Centre for Heart Rhythm Disorders, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia; Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Dennis H Lau
- Centre for Heart Rhythm Disorders, University of Adelaide, Adelaide, South Australia, Australia; South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia; Royal Adelaide Hospital, Adelaide, South Australia, Australia.
| |
Collapse
|
10
|
Brignole M, Moya A, de Lange FJ, Deharo JC, Elliott PM, Fanciulli A, Fedorowski A, Furlan R, Kenny RA, Martín A, Probst V, Reed MJ, Rice CP, Sutton R, Ungar A, van Dijk JG. 2018 ESC Guidelines for the diagnosis and management of syncope. Eur Heart J 2018; 39:1883-1948. [PMID: 29562304 DOI: 10.1093/eurheartj/ehy037] [Citation(s) in RCA: 964] [Impact Index Per Article: 160.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
|
11
|
Hakim A, O'Callaghan C, De Wandele I, Stiles L, Pocinki A, Rowe P. Cardiovascular autonomic dysfunction in Ehlers-Danlos syndrome-Hypermobile type. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2017; 175:168-174. [PMID: 28160388 DOI: 10.1002/ajmg.c.31543] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Autonomic dysfunction contributes to health-related impairment of quality of life in the hypermobile type of Ehlers-Danlos syndrome (hEDS). Typical signs and symptoms include tachycardia, hypotension, gastrointestinal dysmotility, and disturbed bladder function and sweating regulation. Cardiovascular autonomic dysfunction may present as Orthostatic Intolerance, Orthostatic Hypotension, Postural Orthostatic Tachycardia Syndrome, or Neurally Mediated Hypotension. The incidence, prevalence, and natural history of these conditions remain unquantified, but observations from specialist clinics suggest they are frequently seen in hEDS. There is growing understanding of how hEDS-related physical and physiological pathology contributes to the development of these conditions. Evaluation of cardiovascular symptoms in hEDS should include a careful history and clinical examination. Tests of cardiovascular function range from clinic room observation to tilt-table assessment to other laboratory investigations such as supine and standing catecholamine levels. Non-pharmacologic treatments include education, managing the environment to reduce exposure to triggers, improving cardiovascular fitness, and maintaining hydration. Although there are limited clinical trials, the response to drug treatments in hEDS is supported by evidence from case and cohort observational data, and short-term physiological studies. Pharmacologic therapy is indicated for patients with moderate-severe impairment of daily function and who have inadequate response or tolerance to conservative treatment. Treatment in hEDS often requires a focus on functional maintenance. Also, the negative impact of cardiovascular symptoms on physical and psycho-social well-being may generate a need for a more general evaluation and on-going management and support. © 2017 Wiley Periodicals, Inc.
Collapse
|
12
|
Antroduodenal Manometry Is Abnormal in Children Presenting With Orthostatic Intolerance and Gastrointestinal Symptoms. J Pediatr Gastroenterol Nutr 2016; 63:329-35. [PMID: 26859090 DOI: 10.1097/mpg.0000000000001150] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVES Gastrointestinal (GI) symptoms of nausea, vomiting, and abdominal pain are common in patients with orthostatic intolerance (OI), including neurally mediated hypotension (NMH) and postural orthostatic tachycardia syndrome (POTS). Autonomic dysregulation is considered the underlying pathophysiology behind the cardiovascular symptoms of POTS. Because the autonomic nervous system also regulates GI motility, we hypothesized that patients with POTS and GI symptoms will have evidence of autonomic dysmotility of the upper GI tract. METHODS Thirty-five subjects with OI and GI symptoms were studied. All the subjects had a 24-hour antroduodenal manometry (ADM) study, in conjunction with pharmacologic challenge and autonomic and tilt table testing (TTT). RESULTS The mean subject age was 16.2 ± 2.8 years (range 10-23.8 years), and male to female ratio was 10:25. TTT was abnormal in all the 35 subjects, whereas Valsalva testing was abnormal (+40 mmHG) in 21 of 34 (62%) subjects, and corrected QT interval was ≥0.44 seconds in 19 of 35 (54%) subjects. During TTT, GI symptoms were reproduced in 31 of 35 (89%) studies. ADM was found to be abnormal at baseline, before the TTT in 5 of 35 (14%) subjects, whereas it became abnormal in 23 of 34 (68%) subjects during TTT. In addition, the expected response to the pharmacologic challenge was limited. Overall, ADM was abnormal in 26 of 35 (74%) patients either at baseline or during TTT in these subjects with OI. CONCLUSIONS ADM is frequently abnormal in children with OI and GI symptoms. Upper GI motility studies should be a part of the comprehensive evaluation in this population.
Collapse
|
13
|
Brignole M. Finally, a Drug Proves to Be Effective Against Vasovagal Syncope! J Am Coll Cardiol 2016; 68:10-2. [DOI: 10.1016/j.jacc.2016.03.595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 03/15/2016] [Indexed: 10/21/2022]
|
14
|
Moak JP, Leong D, Fabian R, Freedenberg V, Jarosz E, Toney C, Hanumanthaiah S, Darbari A. Intravenous Hydration for Management of Medication-Resistant Orthostatic Intolerance in the Adolescent and Young Adult. Pediatr Cardiol 2016; 37:278-82. [PMID: 26446285 DOI: 10.1007/s00246-015-1274-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Accepted: 09/23/2015] [Indexed: 10/23/2022]
Abstract
Orthostatic intolerance (OI) is common in teenagers (T) and young adults (A). Despite treatment with oral fluids, medication, and exercise, a significant number have symptoms from multiple organ systems and suffer low quality of life (QOL). Previous studies showed that acute intravenous (IV) hydration (IH) could help restore orthostatic tolerance; however, no data are available about the intermediate-term effects of IH. We therefore studied the efficacy of IH to improve QOL and manage medication-refractory OI patients. Our study population consisted of 39 patients (mean age = 16.1 ± 3.3) years; thirty-two were female. Average number of medications failed = 3.1. Average QOL score on self-reported OI questionnaire was 4.2 (normal QOL = 10). IV hydration consisted of normal saline (1-2 l/day, 3-7 days/week). 1) Orthostatic testing revealed Postural Orthostatic Tachycardia (24), Neurally Mediated Hypotension (14) or OI (1). 2) Average orthostatic change in heart rate was 48 ± 18 bpm. 3) IH was performed via intermittent IV access (10), PICC line (22), and Port (7). 4) Duration of IH varied from 1 week to 3.8 years (mean = 29 ± 47 weeks). 5) Overall, 79 % (n = 31) demonstrated clinically improved self-reported QOL. 6) Six patients who discontinued IH requested to restart treatment. (7) Complications consisted of upper extremity deep vein thrombosis (n = 3) and infection (n = 4). IH is an effective therapy to improve QOL in T&A with medication-resistant OI. Most patients continued to report improved QOL once IH was discontinued. IH should be considered a therapeutic option in medication-resistant OI patients with low QOL.
Collapse
Affiliation(s)
- Jeffrey P Moak
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA.
| | - Derek Leong
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Robin Fabian
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Vicki Freedenberg
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Elizabeth Jarosz
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Carol Toney
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Sridhar Hanumanthaiah
- Division of Cardiology, Children's National Medical Center, 111 Michigan Ave, NW, Washington, DC, 20010, USA
| | - Anil Darbari
- Division of Gastroenterology, Children's National Medical Center, Washington, DC, USA
| |
Collapse
|
15
|
ONISHI YOSHIMI, MINOURA YOSHINO, CHIBA YUTA, ONUKI TATSUYA, ITO HIROYUKI, ADACHI TARO, ASANO TAKU, KOBAYASHI YOUICHI. Daily Dysfunction of Autonomic Regulation Based on Ambulatory Blood Pressure Monitoring in Patients with Neurally Mediated Reflex Syncope. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2015; 38:997-1004. [DOI: 10.1111/pace.12661] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 05/01/2015] [Accepted: 05/08/2015] [Indexed: 11/30/2022]
Affiliation(s)
- YOSHIMI ONISHI
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - YOSHINO MINOURA
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - YUTA CHIBA
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - TATSUYA ONUKI
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - HIROYUKI ITO
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - TARO ADACHI
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - TAKU ASANO
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| | - YOUICHI KOBAYASHI
- Division of Cardiology, Department of Medicine; Showa University School of Medicine; Tokyo Japan
| |
Collapse
|
16
|
Abstract
Vasovagal syncope is a common disorder that affects at least 20% of people at some time in their lives. Probably half of these patients faint recurrently; for many this causes physical trauma, a substantial reduction in quality of life, and difficulties with driving, employment and education. The last 15 years have seen striking advances in diagnostic approaches and prognostic understanding. A number of physiological, pharmacological and electrical therapies have been developed and tested to various degrees in patients. These include counterpressure manoeuvres, salt and fluid recommendations, and attempted treatment with fludrocortisone, midodrine, beta-blockers, serotonin reuptake inhibitors, and permanent pacemakers. This review highlights the most important of these advances and suggests strategies for managing this often difficult problem.
Collapse
Affiliation(s)
- Robert Sheldon
- University of Calgary, Libin Cardiovascular Institute of Alberta, Faculty of Medicine, 3330 Hospital Drive NW Calgary, Alberta, T2N 4N1, Canada.
| | | | | |
Collapse
|
17
|
|
18
|
Allen PR. Chronic Fatigue Syndrome: Implications for Women and their Health Care Providers During the Childbearing Years. J Midwifery Womens Health 2010; 53:289-301; quiz 399. [DOI: 10.1016/j.jmwh.2007.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
19
|
Korsós A, Rudas L, Zöllei E. [A simple miracle of water]. Orv Hetil 2010; 151:1904-7. [PMID: 21044941 DOI: 10.1556/oh.2010.28957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Chronic orthostasis intolerance or postural tachycardia syndrome (POTS) is a common problem, which is related to the more severe forms of autonomic neuropathy. Upright posture regularly elicits uncomfortable symptoms in these patients, which impairs their quality of life. We present a typical case, where orthostatic hemodynamic response was significantly improved by ingestion of 500 ml tap water. This simple measure could be a potent, long-term therapeutic tool.
Collapse
Affiliation(s)
- Anita Korsós
- Szegedi Tudományegyetem, Általános Orvostudományi Kar, Aneszteziológiai és Intenzív Terápiás Intézet, Szeged
| | | | | |
Collapse
|
20
|
Leicht AS, Sinclair WH, Patterson MJ, Rudzki S, Tulppo MP, Fogarty AL, Winter S. Influence of postexercise cooling techniques on heart rate variability in men. Exp Physiol 2009; 94:695-703. [DOI: 10.1113/expphysiol.2009.046714] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Kuo DZ, Cheng TL, Rowe PC. Successful use of a primary care practice-specialty collaboration in the care of an adolescent with chronic fatigue syndrome. Pediatrics 2007; 120:e1536-9. [PMID: 18055669 DOI: 10.1542/peds.2007-0493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
We report on the successful collaborative care of an adolescent with chronic fatigue syndrome between a primary care pediatrician and an academic chronic fatigue syndrome specialist located in different cities. Regular telephone and e-mail communication and clearly defined patient-care roles allowed for timely management of symptoms and marked clinical improvement. We discuss ways to improve the collaboration of primary care and subspecialty physicians for patients with chronic fatigue syndrome and children with special health care needs.
Collapse
Affiliation(s)
- Dennis Z Kuo
- Maple Avenue Pediatrics, Fair Lawn, New Jersey, USA.
| | | | | |
Collapse
|
22
|
Iida H, Kurano M, Takano H, Kubota N, Morita T, Meguro K, Sato Y, Abe T, Yamazaki Y, Uno K, Takenaka K, Hirose K, Nakajima T. Hemodynamic and neurohumoral responses to the restriction of femoral blood flow by KAATSU in healthy subjects. Eur J Appl Physiol 2007; 100:275-85. [PMID: 17342543 DOI: 10.1007/s00421-007-0430-y] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2007] [Indexed: 10/23/2022]
Abstract
The application of an orthostatic stress such as lower body negative pressure (LBNP) has been proposed to minimize the effects of weightlessness on the cardiovascular system and subsequently to reduce the cardiovascular deconditioning. The KAATSU training is a novel method to induce muscle strength and hypertrophy with blood pooling in capacitance vessels by restricting venous return. Here, we studied the hemodynamic, autonomic nervous and hormonal responses to the restriction of femoral blood flow by KAATSU in healthy male subjects, using the ultrasonography and impedance cardiography. The pressurization on both thighs induced pooling of blood into the legs with pressure-dependent reduction of femoral arterial blood flow. The application of 200 mmHg KAATSU significantly decreased left ventricular diastolic dimension (LVDd), cardiac output (CO) and diameter of inferior vena cava (IVC). Similarly, 200 mmHg KAATSU also decreased stroke volume (SV), which was almost equal to the value in standing. Heart rate (HR) and total peripheral resistance (TPR) increased in a similar manner to standing with slight change of mean blood pressure (mBP). High-frequency power (HF(RR)) decreased during both 200 mmHg KAATSU and standing, while low-frequency/high-frequency power (LF(RR)/HF(RR)) increased significantly. During KAATSU and standing, the concentration of noradrenaline (NA) and vasopressin (ADH) and plasma renin activity (PRA) increased. These results indicate that KAATSU in supine subjects reproduces the effects of standing on HR, SV, TPR, etc., thus stimulating an orthostatic stimulus. And, KAATSU training appears to be a useful method for potential countermeasure like LBNP against orthostatic intolerance after spaceflight.
Collapse
Affiliation(s)
- Haruko Iida
- Department of Ischemic Circulatory Physiology, KAATSU Training, The University of Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Raj SR, Rose S, Ritchie D, Sheldon RS. The Second Prevention of Syncope Trial (POST II)--a randomized clinical trial of fludrocortisone for the prevention of neurally mediated syncope: rationale and study design. Am Heart J 2006; 151:1186.e11-7. [PMID: 16781217 DOI: 10.1016/j.ahj.2006.03.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2006] [Accepted: 03/20/2006] [Indexed: 11/25/2022]
Abstract
BACKGROUND Neurally mediated syncope is a common and frequently distressing problem. It is associated with a poor quality of life, which improves when the frequency of syncope is reduced. Few therapies for neurally mediated syncope have been proven effective. Fludrocortisone is commonly used to prevent recurrences of syncope but with little evidence to support its use. A placebo-controlled clinical trial of fludrocortisone for the prevention of neurally mediated syncope is needed. STRUCTURE OF STUDY POST II is a multicenter, international, randomized, placebo-controlled study of fludrocortisone in the prevention of neurally mediated syncope. The primary end point is the time to first recurrence of syncope. Patients will be randomized 1:1 to receive fludrocortisone 0.05 to 0.2 mg or matching placebo and followed for 1 year. Secondary end points include syncope frequency, presyncope, and quality of life. Primary analysis will be performed with an intention-to-treat approach, with a secondary on-treatment analysis. POWER CALCULATIONS Assuming a 40% risk of syncope in the control arm, a relative reduction of 40% by fludrocortisone, and a dropout rate of 20%, the enrollment of 310 patients will give an 80% power of reaching a positive conclusion about fludrocortisone therapy, with P = .05. REGISTRATION POST II is registered with both (ISRCTN 51802652) and (NCT00118482). IMPLICATIONS This study will be the first adequately powered trial to determine whether fludrocortisone is effective in preventing neurally mediated syncope. If it is effective, then fludrocortisone may become the first-line medical therapy for this condition.
Collapse
Affiliation(s)
- Satish R Raj
- Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University, Nashville, TN, USA
| | | | | | | |
Collapse
|
24
|
Sheldon RS, Sheldon AG, Connolly SJ, Morillo CA, Klingenheben T, Krahn AD, Koshman ML, Ritchie D. Age of first faint in patients with vasovagal syncope. J Cardiovasc Electrophysiol 2006; 17:49-54. [PMID: 16426400 DOI: 10.1111/j.1540-8167.2005.00267.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Understanding whether vasovagal syncope is a lifelong disorder might shed insight into its physiology and affect management strategies. Accordingly, we determined the age of the first syncopal spell in adult patients who sought care for syncope. METHODS AND RESULTS Patients were 42 +/- 18 years old with 64% women. They had had a median 8 syncope spells (interquartile range [IQR]: 4, 20) with a median frequency of 1.0 syncopal spells per year. The range of syncopal spells was 1-3,375, and the range of duration of history of syncope was 0.003-70 years. The first syncopal spell occurred at ages 0-81 in a skewed distribution, with a marked mode age of 13 years, a median age of 18 years (IQR 12, 37), and a mean age of 26 +/- 20 years. The distributions were statistically indistinguishable across countries (P = 0.50), among Canadian regions (P = 0.69), and between the studies (P = 0.49). The same modal values were seen in males and females, and in patients <40 and > or =40 years old. However, patients > or =40 years had median ages of onset older than patients <40 years (36 +/- 23 vs 17 +/- 8 years). Patients had a recalled history of syncopal spells of median duration of 10 years (IQR: 2, 23), with a range of 0.003-70 years. An age of onset <44 years was 86% accurate for vasovagal syncope. CONCLUSION The most common age at which vasovagal syncope first presents is 13 years, and patients remain at risk of syncope for many years. Lifelong coping strategies may be desirable.
Collapse
Affiliation(s)
- Robert S Sheldon
- Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada.
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Iida H, Kurano M, Takano H, Oonuma H, Imuta H, Kubota N, Morita T, Meguro K, Sato Y, Abe T, Yamazaki T, Nakajima T. Can KAATSU be used for an orthostatic stress in astronauts?: A case study. ACTA ACUST UNITED AC 2006. [DOI: 10.3806/ijktr.2.45] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
26
|
Iida H, Takano H, Meguro K, Asada K, Oonuma H, Morita T, Kurano M, Sakagami F, Uno K, Hirose K, Nagata T, Takenaka K, Suzuki J, Hirata Y, Furuichi T, Eto F, Nagai R, Sato Y, Nakajima T. Hemodynamic and autonomic nervous responses to the restriction of femoral blood flow by KAATSU. ACTA ACUST UNITED AC 2005. [DOI: 10.3806/ijktr.1.57] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
27
|
Moak JP, Bailey JJ, Makhlouf FT. Simultaneous heart rate and blood pressure variability analysis. Insight into mechanisms underlying neurally mediated cardiac syncope in children. J Am Coll Cardiol 2002; 40:1466-74. [PMID: 12392838 DOI: 10.1016/s0735-1097(02)02273-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The purpose of our investigation was to examine serial changes in autonomic nervous system activity along with measurements of hemodynamics and cardiac contractility, in assessing the mechanism(s) that underlie neurally mediated cardiac syncope (NMCS) in children. BACKGROUND Previous research that used heart rate variability analysis alone to understand changes in autonomic activity that result in NMCS has provided conflicting results. We performed simultaneous heart rate and blood pressure variability analyses to characterize dynamic alterations in sympathetic and vagal tone during tilt-table testing in 23 children with a history of syncope or frequent dizziness. METHODS Power spectra of heart rate and blood pressure variability were analyzed using autoregressive modeling. Maximum dP/dT of systolic blood pressure and the electrical-mechanical activation time were used to assess cardiac contractility. RESULTS Tilt-table testing was positive in 12 children and negative in 11. Syncope was associated with decreased heart rate, blood pressure and low-frequency (LF) power. Before episodes of syncope, systolic blood pressure dP/dT decreased, and the electrical-mechanical activation time was prolonged. The decrease in blood pressure LF power exceeded and occurred before the decrease in heart rate LF power. Despite similar early increases in LF power to the initial stress of upright tilting, no significant decline in LF power (heart rate or blood pressure) was observed during negative tilt-table tests. CONCLUSIONS All of these changes considered in total provide evidence supporting the hypothesis of sympathetic withdrawal/failure, resulting in a decrease in peripheral vascular tone and cardiac contractility, which results in profound hypotension in children with NMCS.
Collapse
Affiliation(s)
- Jeffrey P Moak
- Department of Cardiology, Children's National Medical Center, Washington, DC 20010, USA.
| | | | | |
Collapse
|
28
|
Abstract
This study examined the potential clinical contribution of noninvasive brain and skeletal muscle oximetry as a diagnostic aid in neurally mediated syncope. Tilt table testing was performed in 15 patients with a history of syncope and 9 healthy volunteers. Spatially resolved reflectance near-infrared spectroscopy was used to examine regional oxyhemoglobin saturation in the frontal cerebral cortex and pectoral muscle. During upright tilt, syncope occurred in four patients. Each episode was associated with bradycardia, hypotension, and brain oxygen desaturation of > 20% from the supine reference baseline, while the largest desaturation in nonsyncopal patients was 13%. In two syncopal patients, a sudden increase in pectoral oxygen saturation preceded cerebral oxygen desaturation and unconsciousness, suggesting a sudden loss of peripheral sympathetic tone. Simultaneous desaturation in both tissues in the other two patients appeared to be in response to a diminished cardiac output. The muscle and brain oxygen saturation ratio increased by 75% with apparent sympathetic dysfunction, but never changed by > 25% in the other patients, and varied by < 15% in the volunteers. These results suggest that during tilt table testing, simultaneous assessment of brain and skeletal muscle oxygenation may provide a simple, objective aid for the identification of contributory sympathetic dysfunction.
Collapse
Affiliation(s)
- I Singer
- Division of Cardiology, Department of Medicine, University of Louisville Hospital, Ambulatory Care Bldg., 530 S. Jackson, Third Floor, Louisville, KY 40292, USA.
| | | |
Collapse
|