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← ScienceWhich outcome occurs when a pacemaker's lead capacitance degrades?
A)Increased pacing threshold requirements✓
B)Decreased ventricular refractory periode
C)Reduced myocyte stimulation frequency
D)Elevated endocardial acceleration amplitude
💡 Explanation
Increased pacing threshold results because degraded capacitance leads to reduced charge storage, and less charge available reduces stimulation strength, therefore a higher voltage is required to trigger depolarization, rather than alternative changes to refractory period or acceleration.
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