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Frye WS, Greenberg B. Exploring quality of life in postural orthostatic tachycardia syndrome: A conceptual analysis. Auton Neurosci 2024; 252:103157. [PMID: 38364354 DOI: 10.1016/j.autneu.2024.103157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/27/2023] [Accepted: 02/10/2024] [Indexed: 02/18/2024]
Abstract
Postural Orthostatic Tachycardia Syndrome (POTS) is a complex autonomic disorder characterized by an abnormal increase in heart rate upon orthostatic change. While primarily described in its effect on the autonomic and cardiovascular system, it can cause significant functional impairment, leading to a diminished quality of life (QoL). This review paper aims to delve into the multifaceted dimensions of QoL in individuals with POTS by providing a conceptual model to discuss factors influencing QoL. Current QoL assessments used in the POTS population and their findings are described for each domain in this conceptual model. Limitations to this body of research include the literature having no consensus in the most appropriate measure of QoL to use for individuals with POTS, the absence of a POTS-specific measure of QoL, and current measures not assessing concerns germane to this population. The authors emphasize the necessity of a POTS-specific measure to be developed to improve our assessment and understanding of how living with POTS impacts QoL.
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Affiliation(s)
- William S Frye
- Department of Psychology, Johns Hopkins All Children's Hospital, St. Petersburg, FL, USA.
| | - Brooke Greenberg
- Department of Clinical and School Psychology, Nova Southeastern University, Fort Lauderdale, FL, USA
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McGeoch CLB, Steinberg RS, Bortfeld KS, Almuwaqqat Z, Rheudasil JM, Bhatia NK, Cutchins AC. Radiofrequency venous ablation for symptomatic relief in postural orthostatic tachycardia syndrome: a case series. Eur Heart J Case Rep 2024; 8:ytae029. [PMID: 38328599 PMCID: PMC10849078 DOI: 10.1093/ehjcr/ytae029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 01/08/2024] [Accepted: 01/19/2024] [Indexed: 02/09/2024]
Abstract
Background Hypovolemic postural orthostatic tachycardia syndrome (POTS) is thought to be caused by dysregulated circulating blood volume. Management is mainly limited to symptom-targeted lifestyle changes. Radiofrequency venous ablation (RFA) represents a minimally invasive method of increasing circulating blood volume. The following case series describes a novel application of RFA to successfully target POTS symptoms in patients demonstrating venous insufficiency. The use of RFA in alleviating POTS symptoms has not previously been reported. Case summary We describe four patients with either a well-established historical POTS diagnosis or dysautonomia symptoms refractory to both medical management and lifestyle modifications. They all demonstrated venous reflux on lower extremity venous ultrasound testing. Upon vascular surgery referral, all underwent great and small saphenous vein RFA. They each subsequently reported subjective improvement in their dysautonomia symptoms and quality-of-life. Two with symptom recurrence years later were found to have new-onset pelvic venous congestion and are being evaluated for pelvic venous insufficiency interventions. Discussion Lower extremity venous pooling can exacerbate dysautonomia symptoms in POTS patients. Patients refractory to conventional treatment strategies should undergo venous insufficiency workup, and if positive, should be referred for venous pooling intervention evaluation. The success of RFA at treating refractory POTS symptoms in these four patients with lower extremity venous reflux, including no surgical intervention and no adverse effects, are compelling grounds to further explore this therapy and to quantify and standardize symptom improvement assessment in a larger patient population. Future directions include a demonstration of quality-of-life improvement in randomized clinical trials.
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Affiliation(s)
| | - Rebecca S Steinberg
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Kristina S Bortfeld
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Zakaria Almuwaqqat
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | - J Mark Rheudasil
- Department of Surgery, Division of Vascular Surgery and Endovascular Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Neal K Bhatia
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | - Alexis C Cutchins
- Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
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Oyewunmi OA, Lei LY, Laurin JKH, Morillo CA, Sheldon RS, Raj SR. Hemodynamic Effects of the Osmopressor Response: A Systematic Review and Meta-Analysis. J Am Heart Assoc 2023; 12:e029645. [PMID: 37929748 PMCID: PMC10727389 DOI: 10.1161/jaha.122.029645] [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: 02/02/2023] [Accepted: 09/27/2023] [Indexed: 11/07/2023]
Abstract
Background Rapidly consuming water may offer practical orthostatic hypotension therapy. However, its efficacy across disorders remains uncertain. This study aims to assess the impact of rapid 350- to 500-mL water intake on systolic and diastolic blood pressure (BP) and heart rate (HR) through a systematic review and meta-analysis. Methods and Results We systematically reviewed MEDLINE and Embase up to June 2023, including randomized controlled trials and prospective cohort studies. Using random-effects meta-analysis, we calculated pooled mean differences (MDs) for maximum hemodynamic effects of rapid 350- to 500-mL water bolus consumption. Participants with orthostatic hypotension experienced increased systolic BP (MD, 24.18 [95% CI, 15.48-32.88]) and diastolic BP (MD, 11.98 [95% CI, 8.87-15.09]) with decreased HR (MD, -3.46 [95% CI, -5.21 to -1.71]). Similar results were observed in multiple system atrophy and pure autonomic failure subgroup analysis. Healthy participants showed modest increases in systolic BP (MD, 2.33 [95% CI, 1.02-3.64]) and diastolic BP (MD, 2.73 [95% CI, 1.15-4.30]), but HR changes were not significant (MD, -2.06 [95% CI, -5.25 to 1.13]). Water had no significant hemodynamic effects in patients with seated or supine postural tachycardia syndrome, although standing effects were unassessed. Our data do not exclude water's potential standing effect in postural tachycardia syndrome. Conclusions In patients with orthostatic hypotension, rapid water intake elevated short-term systolic BP and diastolic BP, with mild HR reduction when seated or supine. Healthy participants exhibited similar but milder effects. However, patients with postural tachycardia syndrome did not experience these changes in seated or supine positions. Further research is needed to evaluate the promising impact of rapid water ingestion on patients with postural tachycardia syndrome in a standing position, which was not addressed in our study.
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Affiliation(s)
- Oyebimbola A. Oyewunmi
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
| | - Lucy Y. Lei
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
| | - Jill K. H. Laurin
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
| | - Carlos A. Morillo
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
| | - Robert S. Sheldon
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
| | - Satish R. Raj
- Department of Cardiac SciencesLibin Cardiovascular Institute, Cumming School of Medicine, University of CalgaryABCanada
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Maier A, Schopen L, Thiel JC, Müller K, Fimm B, Schulz JB. Cognitive functioning in postural orthostatic tachycardia syndrome among different body positions: a prospective pilot study (POTSKog study). Clin Auton Res 2023; 33:459-468. [PMID: 37261636 PMCID: PMC10439038 DOI: 10.1007/s10286-023-00950-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 04/29/2023] [Indexed: 06/02/2023]
Abstract
PURPOSE Approximately 96% of patients with postural orthostatic tachycardia syndrome (PoTS) report cognitive complaints. We investigated whether cognitive function is impaired during sitting and active standing in 30 patients with PoTS compared with 30 healthy controls (HCs) and whether it will improve with the counter manoeuvre of leg crossing. METHODS In this prospective pilot study, patients with PoTS were compared to HCs matched for age, sex, and educational level. Baseline data included norepinephrine plasma levels, autonomic testing and baseline cognitive function in a seated position [the Montreal Cognitive Assessment, the Leistungsprüfsystem (LPS) subtests 1 and 2, and the Test of Attentional Performance (TAP)]. Cognitive functioning was examined in a randomized order in supine, upright and upright legs crossed position. The primary outcomes were the cognitive test scores between HCs and patients with PoTS at baseline testing, and among the different body positions. RESULTS Patients with PoTS had impaired attention (TAP median reaction time) in the seated position and impaired executive functioning (Stroop) while standing compared with HC. Stroop was influenced by position (supine versus upright versus upright legs crossed) only in the PoTS group. Leg crossing did not result in an improvement in executive function. In patients with PoTS, there was a negative correlation of Stroop with norepinephrine plasma levels while standing. CONCLUSION Compared with HCs, PoTS participants showed impaired cognitive attention and executive function in the upright position that did not improve in the legs crossed position. Data provide further evidence for orthostatic cognitive deterioration in patients with PoTS. TRIAL REGISTRATION INFORMATION The study was registered at ClinicalTrials.gov (NCT03681080).
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Affiliation(s)
- Andrea Maier
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany.
| | - Lena Schopen
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany
| | - Joana C Thiel
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany
| | - Katharina Müller
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany
- Department of Gynaecology, Medical Faculty RWTH Aachen University, Aachen, Germany
| | - Bruno Fimm
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany
| | - Jörg B Schulz
- Department of Neurology, Medical Faculty RWTH Aachen University, Aachen, Germany
- JARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, Jülich Research Center GmbH and RWTH Aachen University, Aachen, Germany
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Rodriguez B, Hochstrasser A, Eugster PJ, Grouzmann E, Müri RM, Z’Graggen WJ. Brain fog in neuropathic postural tachycardia syndrome may be associated with autonomic hyperarousal and improves after water drinking. Front Neurosci 2022; 16:968725. [PMID: 35992935 PMCID: PMC9388780 DOI: 10.3389/fnins.2022.968725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 07/19/2022] [Indexed: 11/18/2022] Open
Abstract
Background Brain fog is a common and highly disturbing symptom for patients with neuropathic postural tachycardia syndrome (POTS). Cognitive deficits have been measured exclusively in the upright body position and mainly comprised impairments of higher cognitive functions. The cause of brain fog is still unclear today. This study aimed to investigate whether increased autonomic activation might be an underlying mechanism for the occurrence of brain fog in neuropathic POTS. We therefore investigated cognitive function in patients with neuropathic POTS and a healthy control group depending on body position and in relation to catecholamine release as a sensitive indicator of acute stress. The second aim was to test the effect of water intake on cardiovascular regulation, orthostatic symptoms, cognitive function and catecholamine release. Methods Thirteen patients with neuropathic POTS and 15 healthy control subjects were included. All participants completed a total of four rounds of cognitive testing: two before and two after the intake of 500 ml still water, each first in the supine position and then during head-up tilt. At the end of each cognitive test, a blood sample was collected for determination of plasma catecholamines. After each head-up tilt phase participants were asked to rate their current symptoms on a visual analogue scale. Results Working memory performance in the upright body position was impaired in patients, which was associated with self-reported symptom severity. Patients had elevated plasma norepinephrine independent of body position and water intake that increased excessively in the upright body position. The excessive increase of plasma norepinephrine was related to heart rate and symptom severity. Water intake in patients decreased norepinephrine concentrations and heart rate, and improved symptoms as well as cognitive performance. Conclusion Brain fog and symptom severity in neuropathic POTS are paralleled by an excessive norepinephrine secretion. Bolus water drinking down-regulates norepinephrine secretion and improves general symptom severity including brain fog.
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Affiliation(s)
- Belén Rodriguez
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Annie Hochstrasser
- Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Philippe J. Eugster
- Service of Clinical Pharmacology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Eric Grouzmann
- Service of Clinical Pharmacology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - René M. Müri
- Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- Gerontechnology and Rehabilitation Group, ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Werner J. Z’Graggen
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- Department of Neurology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- *Correspondence: Werner J. Z’Graggen,
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Parsons IT, Hockin BCD, Taha OM, Heeney ND, Williams EL, Lucci VEM, Lee RHY, Stacey MJ, Gall N, Chowienczyk P, Woods DR, Claydon VE. The effect of water temperature on orthostatic tolerance: a randomised crossover trial. Clin Auton Res 2022; 32:131-141. [PMID: 35461434 PMCID: PMC9064858 DOI: 10.1007/s10286-022-00860-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 02/17/2022] [Indexed: 11/04/2022]
Abstract
Purpose Bolus water drinking, at room temperature, has been shown to improve orthostatic tolerance (OT), probably via sympathetic activation; however, it is not clear whether the temperature of the water bolus modifies the effect on OT or the cardiovascular responses to orthostatic stress. The aim of this study was to assess whether differing water temperature of the water bolus would alter time to presyncope and/or cardiovascular parameters during incremental orthostatic stress. Methods Fourteen participants underwent three head-up tilt (HUT) tests with graded lower body negative pressure (LBNP) continued until presyncope. Fifteen minutes prior to each HUT, participants drank a 500 mL bolus of water which was randomised, in single-blind crossover fashion, to either room temperature water (20 °C) (ROOM), ice-cold water (0–3 °C) (COLD) or warm water (45 °C) (WARM). Cardiovascular parameters were monitored continuously. Results There was no significant difference in OT in the COLD (33 ± 3 min; p = 0.3321) and WARM (32 ± 3 min; p = 0.6764) conditions in comparison to the ROOM condition (31 ± 3 min). During the HUT tests, heart rate and cardiac output were significantly reduced (p < 0.0073), with significantly increased systolic blood pressure, stroke volume, cerebral blood flow velocity and total peripheral resistance (p < 0.0054), in the COLD compared to ROOM conditions. Conclusions In healthy controls, bolus cold water drinking results in favourable orthostatic cardiovascular responses during HUT/LBNP without significantly altering OT. Using a cold water bolus may result in additional benefits in patients with orthostatic intolerance above those conferred by bolus water at room temperature (by ameliorating orthostatic tachycardia and enhancing vascular resistance responses). Further research in patients with orthostatic intolerance is warranted.
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Jost K, Rodriguez B, Söll N, Hoepner R, Z'Graggen WJ. Tolerability of COVID-19 mRNA vaccines in patients with postural tachycardia syndrome: a cross-sectional study. F1000Res 2022; 11:215. [PMID: 37822957 PMCID: PMC10562791 DOI: 10.12688/f1000research.109373.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/16/2022] [Indexed: 10/13/2023] Open
Abstract
Background: Postural tachycardia syndrome (POTS) is a form of autonomic dysregulation. There is increasing evidence that the etiology may be immune-mediated in a subgroup of patients. Patients with POTS often experience an exacerbation of their symptoms associated with (viral) infections and often fear the same symptom aggravation after vaccination. In this report we describe the tolerability of messenger ribonucleic acid (mRNA) vaccines against coronavirus disease 19 (COVID-19) and the consequences of a COVID-19 infection on POTS symptoms in our cohort of patients with neuropathic POTS. Methods: We conducted a standardized, checklist-based interview with 23 patients and recorded the acute side effects of mRNA vaccination, acute symptoms of COVID-19 infection as well as the effects of vaccination and COVID-19 infection on POTS symptoms. Results: Of all included patients, 20 patients received two mRNA vaccines without having had a previous COVID-19 infection, and five patients in total had suffered a COVID-19 infection. Of these, three had COVID-19 without and two after being vaccinated. No increased frequency of side effects after both doses of mRNA vaccines was observed. Six patients reported a mild and short-term aggravation of their POTS symptoms beyond the duration of acute vaccine side effects. All five patients who suffered a COVID-19 infection subsequently reported a pronounced and persistent exacerbation of POTS symptoms. Conclusions: Our observations suggest that mRNA vaccines are not associated with a higher frequency of acute side effects in patients with POTS. Symptom exacerbation as a consequence of mRNA vaccination seems to be less frequent and of shorter duration compared to patients who suffered a COVID-19 infection.
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Affiliation(s)
- Karin Jost
- Department of Neurology, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
| | - Belén Rodriguez
- Department of Neurosurgery, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
| | - Nicole Söll
- Department of Neurosurgery, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
| | - Robert Hoepner
- Department of Neurology, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
| | - Werner J. Z'Graggen
- Department of Neurology, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
- Department of Neurosurgery, Inselspital, University Hospital Bern, Bern, Bern, 3010, Switzerland
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Hockin BCD, Heeney ND, Whitehurst DGT, Claydon VE. Evaluating the Impact of Orthostatic Syncope and Presyncope on Quality of Life: A Systematic Review and Meta-Analysis. Front Cardiovasc Med 2022; 9:834879. [PMID: 35224062 PMCID: PMC8866568 DOI: 10.3389/fcvm.2022.834879] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 01/17/2022] [Indexed: 12/29/2022] Open
Abstract
Purpose Syncope (transient loss of consciousness and postural tone) and presyncope are common manifestations of autonomic dysfunction that are usually triggered by orthostasis. The global impact of syncope on quality of life (QoL) is unclear. In this systematic review, we report evidence on the impact of syncope and presyncope on QoL and QoL domains, identify key factors influencing QoL in patients with syncopal disorders, and combine available data to compare QoL between syncopal disorders and to population normative data. Methods A comprehensive literature search of academic databases (MEDLINE (PubMed), Web of Science, CINAHL, PsycINFO, and Embase) was conducted (February 2021) to identify peer-reviewed publications that evaluated the impact of vasovagal syncope (VVS), postural orthostatic tachycardia syndrome (POTS), or orthostatic hypotension (OH) on QoL. Two team members independently screened records for inclusion and extracted data relevant to the study objectives. Results From 12,258 unique records identified by the search, 36 studies met the inclusion criteria (VVS: n = 20; POTS: n = 13; VVS and POTS: n = 1; OH: n = 2); 12 distinct QoL instruments were used. Comparisons of QoL scores between patients with syncope/presyncope and a control group were performed in 16 studies; significant QoL impairments in patients with syncope/presyncope were observed in all studies. Increased syncopal event frequency, increased autonomic symptom severity, and the presence of mental health disorders and/or comorbidities were associated with lower QoL scores. Conclusion This review synthesizes the negative impact of syncope/presyncope on QoL and identifies research priorities to reduce the burden of these debilitating disorders and improve patient QoL.
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Affiliation(s)
- Brooke C. D. Hockin
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
- International Collaboration on Repair and Discoveries (ICORD), University of British Columbia, Vancouver, BC, Canada
| | - Natalie D. Heeney
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
- International Collaboration on Repair and Discoveries (ICORD), University of British Columbia, Vancouver, BC, Canada
| | - David G. T. Whitehurst
- International Collaboration on Repair and Discoveries (ICORD), University of British Columbia, Vancouver, BC, Canada
- Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada
| | - Victoria E. Claydon
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
- International Collaboration on Repair and Discoveries (ICORD), University of British Columbia, Vancouver, BC, Canada
- *Correspondence: Victoria E. Claydon
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Eftekhari H, Maddock H, Pearce G, Raza S, Kavi L, Lim PB, Osman F, Hayat SA. Understanding the future research needs in Postural Orthostatic Tachycardia Syndrome (POTS): Evidence mapping the POTS adult literature. Auton Neurosci 2021; 233:102808. [PMID: 33901811 DOI: 10.1016/j.autneu.2021.102808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 03/15/2021] [Accepted: 03/27/2021] [Indexed: 01/01/2023]
Abstract
POTS is under diagnosed with an estimated prevalence of 0.2%. North American and Australian researchers, as well as patient groups have called for more research into POTS. However, there has been no comprehensive appraisal of the current POTS evidence base. AIM To map the POTS evidence base. METHODS Two reviewers systematically searched 12 databases until July 1st 2019 using the search term "Postural Tachycardia Syndrome" (n = 7280) and categorised the literature. Inclusion criteria included all adult published literature with no language restrictions. 779 papers are analysed and mapped. RESULTS Seven themes were identified: symptomology and quality of life 16.8% (n = 132), biomedical topics 16.5% (n = 130), co-morbidities 10.3% (n = 81), non-pharmacological management 9.8% (n = 77), aetiologies 6.9% (n = 53), pharmacological management 6.7% (n = 53), and clinical management 6.6% (n = 52). There 45 subthemes. Quality appraisal of the research studies (n = 233) evaluated design, sample size, outcome measures, data analysis and research biases. 74.8% (n = 175) were observational designs and 25.2% (n = 59) were experimental designs (16 using a randomised controlled design, 11 of which had a sample size greater than 21). 47.4% (n = 111) of studies only measured duration of effect for <1 day. 11.5% (n = 27) of studies reported outcomes using an unvalidated subjective measurement tool. CONCLUSION The volume of adult POTS literature is small and the validity and reliability of the research lacks rigour. The evidence map methodology provides POTS researchers with a benchmark for research thus far. This paper adds an in-depth research appraisal to the broad calls for action, highlighting the pressing need for multicentre, good quality research in POTS, to support guidelines and consensus development in the future.
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Affiliation(s)
- H Eftekhari
- University Hospitals Coventry & Warwickshire NHS Trust, United Kingdom of Great Britain and Northern Ireland.
| | - H Maddock
- Faculty of Health and Life Sciences, Coventry University, United Kingdom of Great Britain and Northern Ireland.
| | - G Pearce
- Faculty of Health and Life Sciences, Coventry University, United Kingdom of Great Britain and Northern Ireland.
| | - S Raza
- Biomedical Sciences, Coventry University, United Kingdom of Great Britain and Northern Ireland.
| | - L Kavi
- PoTS UK, United Kingdom of Great Britain and Northern Ireland.
| | - P B Lim
- Imperial College NHS Healthcare Trust, United Kingdom of Great Britain and Northern Ireland.
| | - F Osman
- University Hospitals Coventry & Warwickshire NHS Trust, United Kingdom of Great Britain and Northern Ireland; Warwick Medical School, University of Warwick, Coventry, United Kingdom of Great Britain and Northern Ireland.
| | - S A Hayat
- Heart Hospital, Hamad Medical Corporation, Doha, Qatar.
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Miglis MG, Muppidi S. Do astronauts get postural tachycardia syndrome? And other updates on recent autonomic research. Clin Auton Res 2019; 29:263-265. [PMID: 31089931 DOI: 10.1007/s10286-019-00613-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 05/07/2019] [Indexed: 12/01/2022]
Affiliation(s)
- Mitchell G Miglis
- Stanford Neurosciences Health Center, 213 Quarry Road, 2nd Floor, Palo Alto, CA, 94304, USA
| | - Srikanth Muppidi
- Stanford Neurosciences Health Center, 213 Quarry Road, 2nd Floor, Palo Alto, CA, 94304, USA.
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