The Elderly Syncope With a Normal ECG
An 81-year-old woman is brought by family after a witnessed syncopal episode at home while walking to the bathroom. She has no prodrome, no chest pain, and no palpitations. She reports a similar episode 3 months ago that was attributed to dehydration. Medications: lisinopril, metoprolol, furosemide, and oxybutynin. Exam: BP 102/60 supine, HR 58, afebrile. Orthostatics: supine 102/60, standing at 3 minutes 84/50 with symptoms. Cardiac exam shows a soft systolic murmur. ECG shows sinus bradycardia at 56 with first-degree AV block and left axis deviation. Point-of-care glucose and hemoglobin are normal. She is now asymptomatic and wants to go home.
1. How do you risk-stratify this patient, and what features push you toward admission versus discharge?
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This patient has multiple high-risk features: age >60, no prodrome (suggesting arrhythmia or structural cause), recurrent episodes, injury risk from a fall, and orthostatic hypotension on exam. The absence of a diagnostic ECG does not exclude an arrhythmic cause; a normal ED ECG has limited sensitivity for intermittent conduction disease or tachyarrhythmia. High-risk features warrant admission for telemetry and evaluation. Features supporting discharge would be a clear vasovagal prodrome, single episode, no structural heart disease, normal ECG, and reliable follow-up; this patient does not meet those. The judgment call is resisting the family's and patient's desire for discharge when the pretest probability of a dangerous cause is meaningful.
2. What is the differential for syncope in this patient, and what workup would you initiate in the ED?
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Differential: arrhythmic (bradyarrhythmia from conduction disease, sick sinus, medication effect; tachyarrhythmia), structural (aortic stenosis given murmur, HCM), orthostatic/hypovolemic (diuretics, ACE inhibitor, anticholinergic), and neurologic (less likely without focal findings). ED workup: ECG (done), orthostatic vitals (done), glucose (done), CBC, BMP including magnesium, troponin, and consideration of bedside echo to assess for aortic stenosis and ventricular function. Telemetry admission is appropriate. Avoid attributing syncope to dehydration without excluding cardiac causes, especially with a murmur and conduction abnormality.
3. If bedside echocardiography shows a calcified aortic valve with reduced opening and a mean gradient estimate suggesting severe stenosis, how does that change management?
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It converts this from a 'syncope workup' to a high-risk structural cardiac diagnosis. Severe aortic stenosis with syncope carries a poor prognosis and is an indication for urgent cardiology/cardiac surgery evaluation. Management changes: avoid aggressive volume depletion, avoid vasodilators that drop preload/afterload precipitously, and avoid strenuous provocation. Admit for telemetry and expedited cardiology consultation and formal echocardiography. Do not discharge with outpatient follow-up as the only plan. The judgment call is recognizing that the murmur plus syncope is not incidental and that bedside findings should drive disposition.