GP · cardiovascular-health
Syncope assessment
Also known as Fainting · Transient loss of consciousness · Vasovagal syncope · Reflex syncope
GP-fellowship guide to syncope assessment: separating true syncope from seizure and psychogenic collapse, the reflex-orthostatic-cardiac classification, red flags that mandate urgent cardiology, orthostatic vitals and ECG-first workup, loop recorder selection, counterpressure manoeuvres and tapers for vasovagal disease, pacemaker trial evidence, driving rules, and the falls overlap in the elderly.
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Target exams
Red flags
- Syncope during exertion is cardiac until proven otherwise — same-day cardiology, no driving
- Syncope without any prodrome, or while supine, suggests arrhythmia — urgent assessment
- Family history of sudden death before age 50 changes management immediately
- Known structural heart disease, heart failure or an abnormal ECG (bifascicular block, pre-excitation, long QT, Brugada pattern) mandates specialist evaluation
Overview
Syncope is one of the commonest reasons for collapse at any age. Most episodes are reflex and benign, but a minority are cardiac, and that minority carries the mortality: after an emergency department visit for syncope, all-cause death runs 1.4% at 30 days and 7.6% at one year, with 37% of first-year deaths cardiac.[3] The whole assessment exists to find those patients.
References11ShowHide
- [1]Connolly SJ et al. Pacemaker therapy for prevention of syncope in patients with recurrent severe vasovagal syncope: Second Vasovagal Pacemaker Study (VPS II): a randomized trial. JAMA, 2003.PMID 12734133
- [2]Sheldon R et al. Prevention of Syncope Trial (POST): a randomized, placebo-controlled study of metoprolol in the prevention of vasovagal syncope. Circulation, 2006.PMID 16505178
- [3]Quinn J et al. Death after emergency department visits for syncope: how common and can it be predicted? Ann Emerg Med, 2008.PMID 17889403
- [4]Milton JC et al. Determinants of a positive response to carotid sinus massage and head-up tilt testing. Eur J Intern Med, 2009.PMID 19818292
- [5]Romme JJ et al. Effectiveness of midodrine treatment in patients with recurrent vasovagal syncope not responding to non-pharmacological treatment (STAND-trial). Europace, 2011.PMID 21752826
- [6]Brignole M et al. Pacemaker therapy in patients with neurally mediated syncope and documented asystole: Third International Study on Syncope of Uncertain Etiology (ISSUE-3): a randomized trial. Circulation, 2012.PMID 22565936
- [7]Costantino G et al. Syncope risk stratification tools vs clinical judgment: an individual patient data meta-analysis. Am J Med, 2014.PMID 24862309
- [8]Tomaino M et al. Physical counter-pressure manoeuvres in preventing syncopal recurrence in patients older than 40 years with recurrent neurally mediated syncope: a controlled study from the Third International Study on Syncope of Uncertain Etiology (ISSUE-3)†. Europace, 2014.PMID 24906609
- [9]Solbiati M et al. The diagnostic yield of implantable loop recorders in unexplained syncope: A systematic review and meta-analysis. Int J Cardiol, 2017.PMID 28052814
- [10]Jordan J et al. Consensus statement on the definition of orthostatic hypertension endorsed by the American Autonomic Society and the Japanese Society of Hypertension. Clin Auton Res, 2023.PMID 36173501
- [11]Collin C et al. Reflex Syncope and the Role of Cardiac Pacing: A Systematic Review and Meta-Analysis. Cureus, 2025.PMID 41080377