Match the following classic electrocardiographic (ECG) findings with their most likely underlying cardiac structural pathology, inflammatory condition, or electrophysiological syndrome.
- Shortened PR interval with a slurred initial upstroke of the QRS complexWolff-Parkinson-White syndrome
- Beat-to-beat variation in QRS complex amplitude with a regular rhythmCardiac tamponade
- Diffuse ST-segment elevations and PR-segment depressions across multiple limb and precordial leadsAcute pericarditis
- Broad, notched P waves in lead II and prominent negative terminal deflections of P waves in lead V1Mitral stenosis
Answer
The correct matches correlate the ECG abnormalities to their pathophysiologies: Pre-excitation (delta wave) pairs with Wolff-Parkinson-White syndrome; electrical alternans pairs with cardiac tamponade; diffuse ST elevations and PR depressions pair with acute pericarditis; and left atrial enlargement (P mitrale) pairs with mitral stenosis.
Each matched pair correctly identifies the pathognomonic electrocardiographic manifestation of the underlying cardiovascular disease state. Wolff-Parkinson-White syndrome features an accessory pathway causing early ventricular depolarization (delta waves). Cardiac tamponade allows the heart to oscillate in effusion fluid, changing the electrical vector continuously (electrical alternans). Acute pericarditis causes generalized diffuse epicardial inflammation (diffuse ST elevation and PR depression). Mitral stenosis causes left atrial enlargement, altering atrial depolarization vectors (P mitrale).
Step-by-Step Solution
Key Concept
Electrocardiographic manifestations of underlying cardiovascular structural and inflammatory pathologies