Physics · Medical Sciences
A patient experiences ventricular fibrillation while admitted to a medical unit. The physician immediately administers a countershock using a defibrillator. What is the physiological mechanism and primary purpose of defibrillation?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To provide exogenous electrical energy to depleted myocardial cells.
- 2To rapidly clear cardiac ischemia and localized tissue acidosis.
- 3To produce a brief period of asystole so that the natural pacemaker can resume control.✓
- 4To directly increase myocardial contractility and stroke volume.
Correct answer
To produce a brief period of asystole so that the natural pacemaker can resume control.
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