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S4 |
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S4 1. Fourth heart sound, which corresponds to atrial contraction during presystole; it is rarely heard in normal hearts. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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s¯ S1 S1-mapping S1S2S3 pattern S2 S3 S3 gallop S4 SA SA conduction time SA node Saanen SAARD SAB Saber BT trocar |
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