Shorter pullback distance typically gives what?

Shorter pullback distance typically gives what?

• A. Better shock vector
• B. Worse shock vector
• C. No effect
• D. More energy required

Answer: (A)

The effectiveness of a defibrillation shock hinges on the current path through the heart—the shock vector. When the pullback distance is shorter, the electrical path between the pads is more direct across the ventricular myocardium. This lowers tissue impedance and concentrates current where it’s needed, increasing the likelihood that the heart depolarizes properly and the arrhythmia is terminated at the given energy. So a shorter distance typically yields a better shock vector. In contrast, a longer distance can diffuse current away from the target tissue and reduce efficacy, and the idea that more energy is required is not consistent with the benefit of a direct path, which often lowers the energy needed to achieve success.

The effectiveness of a defibrillation shock hinges on the current path through the heart—the shock vector. When the pullback distance is shorter, the electrical path between the pads is more direct across the ventricular myocardium. This lowers tissue impedance and concentrates current where it’s needed, increasing the likelihood that the heart depolarizes properly and the arrhythmia is terminated at the given energy. So a shorter distance typically yields a better shock vector. In contrast, a longer distance can diffuse current away from the target tissue and reduce efficacy, and the idea that more energy is required is not consistent with the benefit of a direct path, which often lowers the energy needed to achieve success.