EKG Graph

Human Anatomy, Physiology, and Medicine. Anything human!

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EKG Graph

Post by lelolal » Tue Mar 07, 2006 4:59 pm

On an EKG Graph... what are the periods of systolic Pressure and diastolic pressure in the ventricles? I'm assuming it's the R peak and the S wave? Am i correct?

Also the atrioventricular closing.. is that at Q?

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Post by sdekivit » Tue Mar 07, 2006 8:42 pm

systole of the ventricles: QRS-complex and ST-segment. diastole: T-wave.

You must remember: first we get atrial depolarisation in the P-wave then when we get a PR-segment, atria are contracting. Then depolarisation of the ventricles begins resulting in a QRS-complex. Then ventricular contraction occurs in the 'flatline' between S and T-tops (just as atrial contraction occurs at the 'flatline segment between P and R tops). Also here occurs the first heartsound due to closing of the AV-valves. The repolarization occurs, resulting in a T-wave and ventricular relaxation in the 'flatline' segment between T-wave and P-wave. That's why the second heartsound occurs after the T-wave: the closing of the semilunar valves.

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Post by cardiorrhexis » Wed Mar 08, 2006 2:27 am


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