Open research questions in Cardiovascular Syncope and Autonomic Disorders
209 gap statements mined from Cardiovascular Syncope and Autonomic Disorders papers in our 7.9M-paper local library, which holds 882 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.
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What the literature leaves open
Establishing minimum and optimal standards for staffing, equipment, and interdisciplinary collaboration is a challenge. Ensuring that ANS technicians and nurses receive appropriate training to understand and perform ANS tests is a challenge. The lack of widespread use of pupillometry in ANS practice is a challenge.
Setting up an autonomic unit within the neurological department: a position statement of the European Federation of Autonomic Societies · 2026 · DOIThe study faced challenges in recruiting patients and controls, with a limited sample size of 32 patients and 15 controls. The study had to control for variables such as age and sex, which can affect heart rate increments. The study had to establish a diagnostic cutoff value for postural tachycardia during active standing, which required careful analysis of the data.
The pediatric cutoff values for postural tachycardia during active standing have not been established using a proper validation. The current diagnostic criteria for POTS are based on passive head-up tilt or active standing tests, but the criteria for adolescents are not well established.
The patient's symptoms worsened upon discontinuation of semaglutide, highlighting the need for ongoing treatment. The potential for GLP-1 RAs to improve POTS symptoms is promising, but further research is needed to fully understand their therapeutic effects.
Significant improvement of postural orthostatic tachycardia syndrome (POTS) with semaglutide: a case report · 2026 · DOIThe published definition of cOH comprises a measurement, i.e. a threshold of an upright BP fall, but does not mention signs or symptoms. The relation between blood pressure fall and symptoms is not well understood. The attribution of symptoms to cOH poses multiple clinical challenges.
There is a lack of understanding of the broader physiological implications of modulating natriuretic peptide signaling in POTS. The long-term metabolic implications of NPR1 inhibition are not well understood. Disease heterogeneity complicates individualized therapeutic decision-making.
Natriuretic peptide signaling as a therapeutic target in POTS: physiological opportunities and caveats · 2026 · DOIThe paper identifies technical challenges, such as the scarcity of autonomic specialists and limited access to autonomic testing. It also notes domain challenges, such as the lack of specificity in distinguishing POTS from other autonomic disorders.
One challenge is the limited understanding of the relationship between hEDS and cognitive deficits. Another challenge is the lack of comprehensive assessments of cognitive performance in patients with hEDS. The study also faced challenges in recruiting participants and controlling for comorbid conditions.
Impaired attention and cognitive deficits associated with pain and autonomic symptoms in hypermobile Ehlers-Danlos syndrome: a pilot study · 2026 · DOIThe current evidence base for POTS treatment is limited. There is a need for a more structured approach to trials that prioritizes functional participation and patient-perceived improvement. Comorbidities are not systematically recorded and analyzed in POTS trials.
From “evidence is scarce” to trial-ready care pathways in POTS: an audit-ready roadmap prompted by Schiweck et al. · 2026 · DOIThe lack of consideration of symptoms in the management of OH. The need for a balanced approach that combines objective blood pressure measurements with the patient's lived experience. The importance of identifying patients at risk and reducing disabling symptoms.
Symptoms are an optimal target for orthostatic hypotension screening and management: an argument in favor · 2026 · DOIPrior studies have highlighted the heterogeneity of POTS, but the study aims to contribute to the understanding of this condition. The study investigates the prevalence and co-occurrence of hyperadrenergic and neuropathic features in a large cohort of POTS patients.
Hyperadrenergic and neuropathic features based on clinical autonomic testing in individuals with POTS: an observational cross-sectional study · 2026 · DOIThe study employed a retrospective design, which may limit the interpretation of the results. The study did not control for potential confounding variables, such as deconditioning. The findings are preliminary and require further confirmation.
Correlation of utricular function with elevated ambulatory heart rate in postural orthostatic tachycardia syndrome · 2026 · DOITherapeutic efficacy was summarized from individual case reports, which lacked unified evaluation criteria, - Substantial variations in the medication types, dosages, and treatment durations across studies, - This systematic review is inherently limited by its reliance on previously published case…
The Task Force committee does not specify the training needed for ANS technicians and nurses, - Pupillometry did not meet the preset limit across all three Delphi rounds, - The method is not widely used in ANS…
Setting up an autonomic unit within the neurological department: a position statement of the European Federation of Autonomic Societies · 2026 · DOIThe study faces challenges in terms of patient follow-up, with a significant number of patients lost to follow-up - The researchers also encounter challenges in measuring plasma catecholamine data, which is only available for a reduced number of patients - The study is limited by the lack of a time-to-event analysis due to the missing exact date of death…
Conduct a larger study that includes more frequent follow-up visits within a more extensive timeline, - Further measurement of vesicular catecholamine reserve levels is needed to clarify the extent of NET activity and sympathetic outflow contribution to higher plasma NE and DHPG levels in HyperOH and nOH…
This is a case report, - No definitive conclusions can be drawn, - The effect of treatment was based on a single patient, - The study lacks a control…
Significant improvement of postural orthostatic tachycardia syndrome (POTS) with semaglutide: a case report · 2026 · DOIFew studies have examined the relationship between OH symptoms, orthostatic BP, and cerebral hemodynamics - No study has examined the neural underpinnings of OH symptoms - The general prevalence of asymptomatic OH appears conserved across…
Autonomic debate: symptoms are an optimal target for orthostatic hypotension screening and management. An argument in opposition · 2026 · DOIExamining the neural underpinnings of OH symptoms - Investigating the relationship between OH symptoms, orthostatic BP, and cerebral hemodynamics - Studying the effects of OH on gait and falls in different…
Autonomic debate: symptoms are an optimal target for orthostatic hypotension screening and management. An argument in opposition · 2026 · DOIThe group with unrecognised complaints was small (n = 11) - The reasons for the differences in outcome remain uncertain - The study did not include patients with dementia with Lewy bodies or with severe cognitive…
Future approaches might allow tissue-selective modulation of NPR1 signaling - Future clinical studies of NPR1 antagonism should incorporate metabolic and functional endpoints alongside hemodynamic…
Natriuretic peptide signaling as a therapeutic target in POTS: physiological opportunities and caveats · 2026 · DOIThe study did not investigate the utility of ML applications in POTS extensively, - The COMPASS-31 lacks specificity in distinguishing POTS from other autonomic disorders, - Orthostatic intolerance symptoms are not specific and can overlap with various other…
Heterogeneity of POTS populations - Limited evidence for treatment - Lack of high-specificity biomarkers - Comorbidities contributing to symptom burden and functional…
From “evidence is scarce” to trial-ready care pathways in POTS: an audit-ready roadmap prompted by Schiweck et al. · 2026 · DOIUnable to obtain angiography, - Direct microneurography was not performed, - Limited to a single case study, - No control group for comparison, - Uncertainty about the exact mechanisms of orthostatic…
Investigate the effects of neck lift surgery on carotid baroreceptor function, - Examine the relationship between orthostatic hypertension and sympathoadrenal overactivation, - Develop strategies for preventing and treating orthostatic hypertension after neck lift surgery, - Conduct larger studies to confirm…
Most-cited papers in Cardiovascular Syncope and Autonomic Disorders
- Derivation of the San Francisco Syncope Rule to predict patients with short-term serious outcomes · Annals of Emergency Medicine · 2004 · 328 citations
- Autonomic Disturbance at Onset of Acute Myocardial Infarction · BMJ · 1972 · 320 citations
- Autonomic cardiac control. II. Noninvasive indices and basal response as revealed by autonomic blockades · Psychophysiology · 1994 · 310 citations
- Postural orthostatic tachycardia syndrome (POTS): State of the science and clinical care from a 2019 National Institutes of Health Expert Consensus Meeting - Part 1 · Autonomic Neuroscience · 2021 · 296 citations
- Immediate heart-rate response to standing: simple test for autonomic neuropathy in diabetes. · BMJ · 1978 · 291 citations
- Postural orthostatic tachycardia syndrome (POTS) and other autonomic disorders after COVID-19 infection: a case series of 20 patients · Immunologic Research · 2021 · 260 citations
- Syncope and Its Consequences in Patients With Dementia Receiving Cholinesterase Inhibitors · Archives of Internal Medicine · 2009 · 255 citations
- Autonomic dysfunction following COVID-19 infection: an early experience · Clinical Autonomic Research · 2021 · 249 citations
- Clinical significance and applications of oscillometry · European Respiratory Review · 2022 · 234 citations
- Risk Stratification of Patients With Syncope · Annals of Emergency Medicine · 1997 · 219 citations
Most recent work
- Setting up an autonomic unit within the neurological department: a position statement of the European Federation of Autonomic Societies · Clinical Autonomic Research · 2026
- Five-year risk of cardiovascular events and falling in Parkinson's disease with orthostatic hypotension: A nationwide cohort study · Parkinsonism & Related Disorders · 2026
- How to treat cardiovascular autonomic failure in Parkinson’s disease · Journal of Neural Transmission · 2026
- Risk-Based Nurse-Managed Personalized Heart Failure Interventions · Journal of the American College of Cardiology · 2026
- Management of Orthostatic Hypotension · JAMA Internal Medicine · 2026
- Evaluation of the clinical value of heart rate variability in predicting vasovagal syncope · Frontiers in Cardiovascular Medicine · 2026
- Association and post-iliac vein stenting symptom improvement of postural orthostatic tachycardia syndrome and orthostatic intolerance with pelvic venous disorders: two retrospective studies · EClinicalMedicine · 2026
- An alternative “Port”? Rationale and development process for POts Reprocessing Therapy (PORT), a brain–body therapy for postural tachycardic syndrome (POTS) · Clinical Autonomic Research · 2026
- Impact of Excessive Postural Tachycardia on Disability in Youth with Orthostatic Intolerance · The Journal of Pediatrics · 2026
- The prevalence of orthostatic intolerance, postural orthostatic tachycardia syndrome and orthostatic hypotension in post-acute sequelae of COVID-19 · Frontiers in Cardiovascular Medicine · 2026
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