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Understanding Syncope: Multidisciplinary Approaches to Diagnosis and Management

A special issue of Journal of Clinical Medicine (ISSN 2077-0383). This special issue belongs to the section "Cardiovascular Medicine".

Deadline for manuscript submissions: 31 May 2026 | Viewed by 4787

Special Issue Editors


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Guest Editor
Nova Medical School, Universidade Nova de Lisboa, Lisbon, Portugal
Interests: autonomic function; physiology; pathophysiology and evaluation; syncope; cardiac arrhythmias, inherited heart disease
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Syncope, characterised by a brief loss of consciousness due to a sudden drop in blood flow to the brain, presents significant challenges across various medical fields. Its causes are diverse, ranging from reflex and cardiac to neurological origins, and it is often misdiagnosed, leading to inadequate patient care. Many patients experience the "you do not have a syndrome," resulting in the extensive use of medical resources and significant impacts on their societal and economic well-being and quality of life. Current treatment options are generally poor and vexing, with limited effectiveness.

We invite you to contribute to this Special Issue, which explores all aspects of syncope. We aim to enhance our understanding of its mechanisms, enhance the accuracy of diagnosis, and develop effective treatment options. This aligns with the journal's aim of fostering multidisciplinary research and advanced clinical practices. This Special Issue will also examine the potential impact of digital health, wearable devices, advanced data analysis tools, and artificial intelligence on diagnostic and prognostic capabilities. In addition, understanding the mechanisms of the condition can lead to more personalised treatments. Moreover, the advent of different forms of cardioneuromodulation and the ability to monitor these patients using minimally invasive or non-invasive methods offers new avenues for exploration. The possibility of conducting pragmatic clinical trials with real-world data rather than selected patients is also crucial for gaining more comprehensive insights into therapeutic options.

This Special Issue aims to cover a wide range of topics related to syncope, from basic research to clinical practice. The scope of this Special Issue therefore includes the following:

  • Epidemiology and the economic impact of syncope;
  • The mechanisms underlying different types of syncope (reflex, cardiac, neurological);
  • Diagnostic strategies and tools for distinguishing between syncope types;
  • Prognostication and risk assessment;
  • Treatment options: pharmacological and non-pharmacological, device-based, and interventional;
  • Quality of life and patient outcomes;
  • Role of wearable devices and artificial intelligence in syncope management;
  • Autonomic dysfunction, including orthostatic hypotension and POTS (Postural Orthostatic Tachycardia Syndrome);
  • Multidisciplinary approaches involving various medical fields (autonomics, neurology, cardiology, etc.);
  • Contributions from different professional domains (medicine, nursing, rehabilitation, engineering, data science, psychology).

We welcome original research articles, reviews, and case studies that provide insights into the mechanisms, diagnostics, and management of all types of syncope, highlighting practical challenges and solutions. This Special Issue offers an opportunity for experts to share their findings and practices, fostering collaboration to improve our understanding and management of syncope. Your contributions will help shape future research and improve patient outcomes in this important area.

We look forward to receiving your contributions.

You may choose our Joint Special Issue in Biology.

Prof. Dr. Isabel Rocha
Dr. Sérgio Laranjo
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Clinical Medicine is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • syncope
  • diagnostic strategies
  • prognostication
  • treatment options
  • quality of life
  • wearable devices
  • artificial intelligence
  • autonomic dysfunction
  • orthostatic hypotension
  • POTS (postural orthostatic tachycardia syndrome)

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Published Papers (4 papers)

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Research

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14 pages, 811 KB  
Article
The Programmed Placebo Effect in Patients with Syncope: Preliminary Clinical and Nanostructural Insights with a Hypothetical Quantum-Level Interpretation
by Branka Hadžić, Nebojša Romčević, Nikola Marković, Maša Petrović, Milovan Bojić and Branislav Milovanović
J. Clin. Med. 2025, 14(18), 6386; https://doi.org/10.3390/jcm14186386 - 10 Sep 2025
Viewed by 553
Abstract
Background/Objectives: Syncope is a common clinical problem often requiring pharmacological treatment, yet evidence-based therapies remain limited. Midodrine, a vasopressor agent, is frequently used, though its autonomic effects over time remain unclear. This study aimed to assess autonomic nervous system changes and blood pressure [...] Read more.
Background/Objectives: Syncope is a common clinical problem often requiring pharmacological treatment, yet evidence-based therapies remain limited. Midodrine, a vasopressor agent, is frequently used, though its autonomic effects over time remain unclear. This study aimed to assess autonomic nervous system changes and blood pressure response in syncope patients treated with Midodrine, placebo, or their combination. Additionally, the structural properties of the Midodrine placebo were analyzed using nanotechnological methods. Methods: A total of 67 patients with syncope were randomized to receive Midodrine, sucrose placebo, or their combination over three weeks. All participants underwent 24 h Holter ECG with heart rate variability (HRV) analysis and ambulatory blood pressure monitoring before and after therapy. Structural analysis of Midodrine tablets, sucrose, and Midodrine placebo was performed using Raman spectroscopy and X-ray diffraction (XRD). Results: Patients receiving the Midodrine–placebo combination showed a significant reduction in HRV markers of parasympathetic activity (RMSSD, pNN50, HF) and an increase in sympathetic dominance (LF/HF ratio) compared to the other groups. Only this group showed a statistically significant rise in average systolic and diastolic blood pressure. Raman and XRD analyses revealed structural alterations in the sucrose-based placebo compared to its original form, indicating subtle changes in crystalline structure. Conclusions: In this exploratory study, the combination of Midodrine and placebo was associated with autonomic imbalance and modest increases in blood pressure, which may indicate a potential effect in patients with hypotensive syncope phenotypes. These preliminary findings should be interpreted with caution, and the structural modifications observed in the placebo formulation are presented as hypotheses requiring further investigation rather than established mechanisms. Full article
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15 pages, 415 KB  
Article
Haemodynamic Patterns in Reflex Syncope: Insights from Head-Up Tilt Tests in Adults and Children
by Sergio Laranjo, Helena Fonseca, Ana Clara Felix, Alexandre V. Gourine, Fátima F. Pinto, Mario Oliveira and Isabel Rocha
J. Clin. Med. 2025, 14(6), 1874; https://doi.org/10.3390/jcm14061874 - 11 Mar 2025
Cited by 1 | Viewed by 1251
Abstract
Introduction: Vasovagal syncope is a prevalent condition marked by transient loss of consciousness due to abrupt decreases in systemic blood pressure and/or heart rate. Despite its clinical impact, the underlying haemodynamic mechanisms remain poorly defined, and data on age-related differences are limited and [...] Read more.
Introduction: Vasovagal syncope is a prevalent condition marked by transient loss of consciousness due to abrupt decreases in systemic blood pressure and/or heart rate. Despite its clinical impact, the underlying haemodynamic mechanisms remain poorly defined, and data on age-related differences are limited and sometimes contradictory. Objectives: This study aimed to characterise haemodynamic adaptation patterns during a head-up tilt (HUT) test in adult (≥18 years) and paediatric (<18 years) patients with recurrent reflex syncope, compared with healthy adult controls. We sought to identify distinct temporal haemodynamic signatures and clarify potential age-related differences in syncope mechanisms. Methods: In this prospective observational study, participants underwent continuous beat-to-beat monitoring of cardiac output (CO), stroke volume (SV), heart rate (HR), and total peripheral resistance (TPR) during HUT. Linear mixed-effects models were used to examine time-by-group interactions, and post-hoc analyses were adjusted for multiple comparisons. Effect sizes and confidence intervals (CIs) were reported to quantify the magnitude of differences. Results: A total of 187 fainters (paediatric n = 81, adult n = 106) and 108 non-fainters (including 30 healthy controls) were studied. Compared to adult fainters, paediatric fainters showed a 24% larger decline in CO from baseline (mean difference of 1.1 L/min [95% CI: 0.5–1.7], p = 0.003) and a 15–20 bpm higher peak HR (p = 0.001) during presyncope. Both subgroups experienced significant drops in TPR, which were more pronounced in paediatric fainters (effect size = 0.27, 95% CI: 0.12–0.42). Non-fainters (including controls) maintained relatively stable haemodynamics, with no significant decrease in CO or TPR (p > 0.05). Age-related comparisons indicated a heavier reliance on HR modulation in paediatric fainters, leading to an earlier transition from compensated to pre-syncopal states. Conclusions: These findings demonstrate that paediatric fainters exhibit more abrupt decreases in CO and TPR than adults, alongside higher HR responses during orthostatic stress. Targeted interventions that address this heightened chronotropic dependency—such as tilt-training protocols or strategies to improve venous return—may be particularly beneficial in younger patients. An age-specific approach to diagnosis and management could improve risk stratification, minimise recurrent episodes, and enhance patient outcomes. Full article
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Review

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16 pages, 600 KB  
Review
Using Active Standing Orthostatic Stress Test to Assess Physiological Responses in Individuals with Long COVID: A Systematic Review
by Faith Olarinde, Albená Nunes-Silva, Diana C. Sanchez-Ramirez, Yannick Molgat-Seon and Rodrigo Villar
J. Clin. Med. 2025, 14(22), 8139; https://doi.org/10.3390/jcm14228139 - 17 Nov 2025
Viewed by 632
Abstract
Background/Objectives: Individuals experiencing long COVID (LC) frequently report orthostatic intolerance symptoms, which may be linked to autonomic and cardiovascular dysfunction. The active standing test provides a simple, clinically relevant means to assess these impairments. This systematic review aims to determine the use [...] Read more.
Background/Objectives: Individuals experiencing long COVID (LC) frequently report orthostatic intolerance symptoms, which may be linked to autonomic and cardiovascular dysfunction. The active standing test provides a simple, clinically relevant means to assess these impairments. This systematic review aims to determine the use of the active standing orthostatic stress test in evaluating cardiovascular, autonomic, and respiratory responses in people experiencing LC. Methods: A systematic search, according to PRISMA guidelines, was conducted in PubMed, MEDLINE, EMBASE, CINAHL, and Scopus for articles published between 2020 and 2025. This study was registered in PROSPERO CRD-42024615872. Studies were included if they used the active standing test, enrolled adults (≥18 years), included both long COVID and healthy control groups, used continuous beat-to-beat measurements, and reported physiological outcomes. Risk of bias was assessed using the nine-point Newcastle–Ottawa Scale. Results: Three studies (216 participants experiencing LC and 186 controls) met the inclusion criteria. Across studies, LC individuals consistently exhibited elevated heart rate in both supine and standing positions. However, blood pressure findings were more variable: only one study reported 13% of participants met orthostatic hypotension criteria, while another found significant increases in diastolic blood pressure during standing. Long COVID groups also showed reduced heart rate variability compared to controls. Conclusions: Individuals experiencing LC show elevated heart rate and impaired autonomic function during active standing, with subgroup-specific blood pressure changes. These alterations may contribute to dizziness, fatigue, and reduced activity tolerance. Incorporating active standing into clinical assessment could aid early identification of autonomic dysfunction and inform rehabilitation strategies, though more research is urgently needed. Full article
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15 pages, 2789 KB  
Review
Cardiac Geometry and Function in Patients with Reflex Syncope
by Giorgia Coseriu, Patricia Schiop-Tentea, Csilla-Andrea Apetrei, Iulia-Georgiana Mindreanu, Adriana-Daniela Sarb, Madalina-Patricia Moldovan, Roxana Daiana Lazar, Teodora Avram, Roxana Chiorescu, Gabriel Gusetu, Sorin Pop, Edwin Kevin Heist and Dan Blendea
J. Clin. Med. 2024, 13(22), 6852; https://doi.org/10.3390/jcm13226852 - 14 Nov 2024
Viewed by 1504
Abstract
Reflex syncope (RS) is the most prevalent form of syncope, yet its pathophysiology and clinical presentation are not well understood. Despite controversy, the ‘ventricular theory’ remains the most plausible hypothesis to explain RS in susceptible patients. Certain assumptions regarding the geometry and function [...] Read more.
Reflex syncope (RS) is the most prevalent form of syncope, yet its pathophysiology and clinical presentation are not well understood. Despite controversy, the ‘ventricular theory’ remains the most plausible hypothesis to explain RS in susceptible patients. Certain assumptions regarding the geometry and function of the heart are essential in supporting this theory. Given these considerations, the goal of this review was to try to integrate data on heart morphology and function in a phenotype of a patient susceptible to RS. Previous research suggests that a small left ventricle and atria, in addition to a normo- or hypercontractile myocardium, predispose to more syncopal events. These findings have been confirmed in different subsets of patients, including those with small heart and chronic fatigue syndrome, highlighting common pathophysiologic pathways in these subgroups of population. Heart geometry and function seem to play a role in different treatment strategies for RS patients, including the administration of medications, pacing, and possibly cardioneural ablation. In addition, parameters related to the geometry of the heart chambers and of the electrical activation of the heart seem to have predictive value for syncope recurrence. These parameters could be included in the future and improve the accuracy of predictive models for RS. Full article
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