The S4s1 Interval And Severity Of Dysfunction

1. What is the relationship between the S4-Sj interval and the severity of the loss of compliance present?

ANS: The shorter the P-S4 interval the more severe is the loss of compliance [6]. This means that the longer the S4-S1 interval, the more severe is the loss of compliance.

The longer the S4-Sj interval, the greater is the loss of compliance of the LV (provided the P-R interval is not prolonged) and usually the louder is the S4.

2. How does the S4-S1 interval affect S4 and S1 loudness?

ANS: a. The earlier the S4, the louder it becomes.

Note: By electrical pacing of dogs' atria it has been shown that the earlier in diastole the atrium contracts, the more powerfully it contracts, so long S4-S1 intervals result in a more energetic ventricular contraction than do short S4-S1 intervals. b. As the S4 moves farther from the S1, the S1 becomes softer.

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Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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