Cardiology MCQ 361: Chronaxie

Chronaxie is
a) Minimum voltage which will capture the myocardium at any pulse width
b) Pulse width needed for capture at twice the rheobase voltage
c) Intracardiac signal picked up by the intracardiac electrode
d) ST elevation occurring in the ECG monitored from the electrode tip as the lead makes contact with the myocardium

["Click here for the answer with explanation", "Correct Answer:"]

b) Pulse width needed for capture at twice the rheobase voltage

Rheobase: Minimum voltage which will capture the myocardium at any pulse width.
Chronaxie: Pulse width needed for capture at twice the rheobase voltage.
Electrogram (EGM; egram): intracardiac signal picked up by the intracardiac electrode.
Current of injury: ST elevation occurring in the ECG monitored from the electrode tip as the lead makes contact with the myocardium.

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Source: Cardiophile MD - October 24, 2014 Category: Cardiology Authors: Prof. Dr. Johnson Francis, MD, DM, FACC, FRCP Edin, FRCP London Tags: Cardiology MCQ DM / DNB Cardiology Entrance ECG / Electrophysiology Source Type: blogs