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GERICLINICS

GeriQBank · Paper III · Q9

Syncope

Moderate YieldAsked ×17-mark note
Topic
Falls, Gait & Syncope
Chapter
Falls, Gait, Syncope & Dizziness
Years asked
Not recorded in the source
Frequency
Set 1× in Paper III (2009–2025)

As set in the university paper

  • Syncope.

    Paper III · Falls, Gait, Balance & Dizziness · asked ×1 · 7-mark note · see in paper list

Answer framework

  1. Definition and importance — definition; distinguishing a fall, syncope and seizure; why it is hard to diagnose; loss of consciousness after a fall
  2. Causes in older people — reflex; cardiac; orthostatic; neurological; other; drugs; dementia with Lewy bodies
  3. Evaluation — history; vital signs and postural BP; carotid sinus massage; cardiac examination and echo; monitoring linked to symptoms; selective imaging; the minimum tests
  4. Management — treat the cause; pacing in carotid sinus hypersensitivity; drugs, volume, anaemia and education
  5. Recent updates — ESC classification and TLoC; the initial evaluation; risk stratification; restricted tilt testing; loop recorders; reflex syncope treatment; World Falls Guidelines; India

An exam answer plan drawn from the detailed answer below. Use it to attempt the question first.

Detailed answer

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Attempt it firstOutline your answer as a 7-mark note before revealing it — definition, causes, evaluation, management and the geriatric angle.Reveal answer

Short revision answer

  • Syncope is sudden, transient loss of consciousness and postural tone with spontaneous complete recovery. Distinguishing a fall from syncope and from a seizure is the first step in any faller — it changes the whole pathway. In older people it is hard to pin down (unwitnessed, forgotten, transient causes), and no cause is found in 40–60%.
  • Loss of consciousness after a fall points to a cardiac event (transient arrhythmia, heart block) or a seizure (especially with incontinence).
  • Causes: reflex — vasovagal, carotid sinus hypersensitivity, situational (cough, straining, micturition); cardiac — bradycardia and heart block, tachyarrhythmias, aortic stenosis (syncope = assess for valve replacement); orthostatic — hypovolaemia, low output, autonomic failure, bed rest, drugs, postprandial; neurological — TIA, stroke, seizure (vertigo alone doesn't make a posterior circulation TIA); and PE, hypoxia, hypoglycaemia.
  • Drugs are major culprits: antihypertensives, diuretics, antidepressants, antipsychotics, hypoglycaemics, alcohol and acetylcholinesterase inhibitors. Dementia with Lewy bodies causes syncope, unresponsive episodes, repeated falls and autonomic failure.
  • Evaluation: the history is the most valuable test (circumstances, triggers, prodrome, recovery, witness); vitals; postural BP supine, sitting and at 1 and 3 minutes; carotid sinus massage for 5 seconds if suggested (50% heart-rate fall or a long pause); cardiac examination, with echo for a systolic murmur or slow carotid upstroke.
  • Monitoring must link an arrhythmia to symptoms before it is blamed (ectopy is common). Don't investigate everyone: CT or MRI only for suspected intracranial lesion or seizure; vascular studies for anterior circulation TIA. The minimum in any faller is lying and standing BP and a 12-lead ECG.
  • Treat the cause — antiarrhythmics or pacing only if clearly related to symptoms, valve surgery for aortic stenosis; pacing for carotid sinus hypersensitivity is a proven single-factor falls intervention; withdraw culprit drugs, correct volume and anaemia, treat postural hypotension and teach prodrome recognition.
  • Updates: ESC 2018 groups syncope as reflex, orthostatic or cardiac, within transient loss of consciousness; history alone separates syncope in about 60%; the initial work-up is history, examination with orthostatic BP, and ECG. Low-risk reflex or orthostatic cases need no ED tests; high-risk cases need monitoring (up to 6 hours in the ED, 24 hours in hospital) and a syncope unit (EUSEM 2024).
  • Tilt testing is now only for genuine diagnostic uncertainty (not to choose drugs); use an implantable loop recorder early in recurrent unexplained syncope with high-risk features (patch monitors where unaffordable). Reflex syncope: education, salt and fluid, counter-pressure manoeuvres, stopping hypotensive drugs; pacing only for documented asystole. World Falls Guidelines 2022 limit cardiac work-up to suspected syncope or recurrent unexplained falls. India: history, orthostatic BP, ECG, echo and Holter resolve most cases; PM-JAY covers cardiac procedures.

Condensed by GeriClinics from the detailed answer below, with no new facts added.

Textbook coverage statement. Pathy’s 6th edition covers this in Chapter 52 – Syncope and Non-Epileptic Attacks (pp. 664– 673) and Chapter 33 – Hypotension (pp. 419–426). The uploaded files contain Chapters 75, 78 and 79 in full plus the index; the text of Chapters 52 and 33 is not present in the uploaded material. The textbook content below is therefore taken from Kane’s Chapter 9 and from the cross-references within Pathy Chapters 78 and 79, and post-textbook evidence is clearly separated.

15–20 High-Yield Points

A. Definition and Importance textbook

1.

Syncope is sudden, transient loss of consciousness with loss of postural tone and spontaneous complete recovery. In the falls setting, if there is a clear history of loss of consciousness, a cause for true syncope must be sought.

2.

Distinguishing a fall from syncope and from a seizure is the first step in evaluating any older person who has fallen — it changes the entire diagnostic pathway.

3.

Syncope in the older person is difficult to diagnose because falls are often unwitnessed, the patient may not recall the event, and the causes (arrhythmia, TIA, postural hypotension) are transient. A precise cause remains unidentified in 40–60% of older patients.

4.

A history of loss of consciousness after a fall should raise suspicion of a cardiac event (transient arrhythmia or heart block) causing syncope or near-syncope, or a seizure (especially if there has been incontinence).

B. Causes in Older People textbook

5.

Reflex (neurally mediated): vasovagal responses; carotid sinus hypersensitivity; and situational syncope from reflex increase in vagal tone caused by cough, straining at stool or micturition, leading to bradycardia and hypotension.

6.

Cardiovascular: bradycardia and heart block, tachyarrhythmias, and aortic stenosis. Syncope is a symptom of aortic stenosis and is an indication to evaluate the patient for valve replacement.

7.

Orthostatic: postural hypotension from hypovolaemia, low cardiac output, autonomic dysfunction, impaired venous return, prolonged bed rest, drugs, and postprandial hypotension.

8.

Acute neurological events: TIA, stroke, seizure. Note that a history of transient vertigo alone is not enough to diagnose a posterior circulation TIA — one or more other symptoms (visual field cut, dysarthria, ataxia, limb weakness) must accompany the vertigo.

9.

Other: pulmonary embolism and metabolic disturbances such as hypoxia and hypoglycaemia.

10.

Drugs are a major contributor: antihypertensives, diuretics, antidepressants, antipsychotics, hypoglycaemics and alcohol. Acetylcholinesterase inhibitors are specifically associated with syncope.

11.

Dementia with Lewy bodies is an important cause — syncope and other transient episodes of unresponsiveness, repeated falls and severe autonomic dysfunction are supportive diagnostic features.

C. Evaluation textbook

12.

The history is the single most valuable investigation. Record: circumstances (location, time, activity, whether alone), relationship to posture change, head turning, cough, micturition, a meal or drug intake, premonitory symptoms (light-headedness, palpitations, chest pain, breathlessness, focal neurology, aura, incontinence), what is remembered immediately after, and whether a witness can confirm loss of consciousness.

13.

Vital signs to detect an acute illness. Postural blood pressure and pulse supine, sitting, and at 1 and 3 minutes standing.

14.

If carotid sinus sensitivity is suspected, perform gentle carotid sinus massage for 5 seconds and observe for profound bradycardia (50% reduction in heart rate) or a long pause.

15.

Cardiovascular examination for arrhythmia and aortic stenosis. Because both are serious, treatable and difficult to detect clinically, refer for continuous cardiac monitoring and echocardiography when suspected. Echocardiography should be considered in all patients with a suggestive history and a systolic murmur, or a delayed carotid upstroke.

16.

Cardiac monitoring must document a temporal association between a specific arrhythmia and symptoms before that arrhythmia is diagnosed and treated as the cause — asymptomatic ectopy is common in older people and must not be over-interpreted.

17.

Do not send all patients for extensive diagnostic studies or cardiac monitoring. CT or MRI should be reserved for patients with a high suspicion of an intracranial lesion or seizure disorder. Non-invasive vascular studies if the history suggests anterior circulation TIA.

18.

The minimum investigations in a patient who falls are lying and standing blood pressure and a 12-lead ECG.

D. Management textbook

19.

Treat the identified cause: antiarrhythmics for tachyarrhythmias, pacemaker for bradyarrhythmias, valve surgery for aortic stenosis with syncope — noting that antiarrhythmic and pacing treatment is indicated only if the cardiac disturbance is clearly related to symptoms.

20.

Cardiac pacing in carotid sinus hypersensitivity is one of the single-factor interventions with demonstrated efficacy in fall prevention.

21.

Withdraw or reduce culprit drugs, correct volume depletion and anaemia, treat postural hypotension, and give education on prodrome recognition and safe positioning.

Latest Updates (2023–Present)

Classification (ESC 2018 syncope guidelines, still current) divides syncope into three groups: reflex (neurally mediated) — vasovagal, situational, carotid sinus syndrome; syncope due to orthostatic hypotension; and cardiac syncope — arrhythmic or structural. Syncope sits within the broader concept of transient loss of consciousness (TLoC), which has four defining characteristics: short duration, abnormal motor control, loss of responsiveness, and amnesia for the period of loss of consciousness.

A detailed clinical history alone distinguishes syncope from other forms of TLoC in about 60% of cases. The initial evaluation is history, physical examination including orthostatic blood pressure, and a 12-lead ECG. Risk stratification has replaced blanket admission. Low-risk patients with clear reflex, situational or orthostatic features need no further tests in the emergency department — reassurance and counselling suffice. High-risk patients need an intensive diagnostic approach, monitoring in a resuscitation-capable area (usually up to 6 hours in the ED and 24 hours in hospital) and expert syncope review, which can often be delivered in an outpatient syncope unit. This is reinforced by the 2024 European Society for Emergency Medicine consensus statement. Tilt-table testing has fallen sharply out of favour. It is now used only where there is genuine diagnostic uncertainty — suspected reflex syncope, orthostatic hypotension, POTS or psychogenic pseudosyncope — and there is a class III recommendation against using it to select or assess drug treatment.

Prolonged rhythm monitoring has become central. The implantable loop recorder (ILR) is recommended early in recurrent unexplained syncope with high-risk features or a likely arrhythmic mechanism, and detects a diagnosis far more often than conventional Holter monitoring. Smartphone-linked and patch monitors are increasingly used where an ILR is not affordable — relevant to Indian practice.

Reflex syncope treatment now emphasises education and reassurance, adequate fluid and salt intake, physical counter-pressure manoeuvres, and withdrawal of hypotensive drugs. Pacing is reserved for older patients with documented spontaneous asystolic pauses (the ISSUE-3 and BioSync CLS evidence) and is used with caution. Overlap with falls is now formally recognised. World Falls Guidelines 2022 require cardiovascular assessment in every faller and state that further cardiac work-up is needed only when syncope is described or witnessed, or falls are recurrent and unexplained — an explicit attempt to stop over-investigation.

Indian context: syncope evaluation is limited by cost and access to ILR and tilt testing; a rigorous history, orthostatic blood pressure, 12-lead ECG, echocardiography and ambulatory ECG will resolve most cases. Anaemia, dehydration in hot climates, tuberculosis-related autonomic disturbance, and polypharmacy from multiple prescribers are common contributors, and cardiac procedures are covered under AB-PMJAY.

Current Practice Update

Issue Textbook position Current position

Framework List of causes of syncope in older people Three-group ESC classification (reflex / orthostatic / cardiac) within the concept of TLoC Who gets investigated Do not investigate everyone; monitoring must Formal low-risk vs high-risk stratification; low correlate with symptoms risk discharged from ED without tests; high risk monitored and referred to a syncope unit Tilt-table testing Not emphasised Markedly restricted — only for genuine diagnostic uncertainty; not for selecting therapy Rhythm monitoring Continuous monitoring if arrhythmia suspected Implantable loop recorder used early in recurrent unexplained syncope with suspected arrhythmia Reflex syncope therapy Not detailed Education, salt and fluid, counter-pressure manoeuvres, drug withdrawal; pacing only for documented spontaneous asystole Exam One-Liners Syncope = transient LOC from global cerebral hypoperfusion, with spontaneous complete recovery. Three ESC groups: reflex, orthostatic hypotension, cardiac.

Cause remains unidentified in 40–60% of older patients.

Initial evaluation = history + examination with orthostatic BP + 12-lead ECG; history alone diagnoses ~60%. Syncope in aortic stenosis = indication to assess for valve replacement.

Arrhythmia must be temporally linked to symptoms before it is blamed.

ILR early for recurrent unexplained syncope; tilt testing now rarely indicated.

Incontinence after the event and a prolonged post-ictal phase point to seizure, not syncope.

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