ECG characteristics of manifest SVT (WPW)?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

ECG characteristics of manifest SVT (WPW)?

Explanation:
Manifest WPW on ECG reflects pre-excitation of the ventricles via an accessory pathway that bypasses part of the AV node delay. This makes ventricular activation occur earlier, shortening the PR interval. The early activation produces a delta wave at the start of the QRS, giving a slurred upstroke. Because part of the ventricle is activated early (via the pathway) and the rest through the normal conduction system, the QRS appears widened. So the characteristic pattern is a short PR interval, a delta wave, and a widened QRS. Other patterns—like a prolonged PR interval, or normal PR and QRS—don’t show this pre-excitation feature.

Manifest WPW on ECG reflects pre-excitation of the ventricles via an accessory pathway that bypasses part of the AV node delay. This makes ventricular activation occur earlier, shortening the PR interval. The early activation produces a delta wave at the start of the QRS, giving a slurred upstroke. Because part of the ventricle is activated early (via the pathway) and the rest through the normal conduction system, the QRS appears widened. So the characteristic pattern is a short PR interval, a delta wave, and a widened QRS. Other patterns—like a prolonged PR interval, or normal PR and QRS—don’t show this pre-excitation feature.

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