Just curious not asking a professional opinion, Does anyone know the average time difference between S1 and S2 sounds of the heart the so called lub-dup sound? I believe its around 150 milliseconds. What does it mean if that time difference (quadruples) goes well beyond 600 milliseconds?

  • While not specifically addressing the average time, depolarization starts in the SA node and travels through the heart causing contraction. If there is a delay in one spot, that could indicate damage as the electric signal reroutes. I don't remember my courses well enough to distinguish if this is in the correct spot for a bundle branch block. – JohnP Nov 8 '17 at 14:32

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