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The relaxed subject sits on a chair through the lower arm supported as before. The blood pressure cuff is put on the subject"s ideal arm, enabling 1 inch in between the bottom that the cuff and the wrinkle of the elbow.
The brachial pulse is palpated just over the edge of the elbow (the "antecubital fossa").
One group member put on a stethoscope, with the earpieces top top the headpiece angled forward. The recording finish of the stethoscope is twisted, so that the diaphragm and also not the bell is activated. This deserve to be tested by tapping lightly on the diaphragm.

You are watching: What produces the systolic korotkoff sound

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The diaphragm is put over the brachial artery in the an are between the bottom the the cuff and the crease of the elbow. In ~ this allude no sounds should be heard.
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The cuff press is inflated conveniently to a pressure about 30 mm Hg greater than the systolic pressure identified by the method of palpation. Climate the air is let out of the cuff in ~ a rate such the cuff pressure falls at a price of around 5 mm Hg/sec. in ~ some point the human listening with the stethoscope will start to hear sounds with each heartbeat. This point marks the systolic pressure. The sound are referred to as Korotkoff sounds.
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together the push is lower further, the personality of the Korotkoff sounds must change. At part point, the sounds will certainly disappear. The press reading at this suggest gives the diastolic pressure.
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The subject should now lie on his or her earlier for five minutes. The systolic pressure and diastolic pressure are recorded. Then the subject stands up, and also the pressure are instantly recorded when more. Explanatory notes The laminar circulation that generally occurs in arteries produces tiny vibration the the arterial wall and because of this no sounds. However, when an artery is partly constricted, blood circulation becomes turbulent, resulting in the artery to vibrate and also produce sounds.
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as soon as measuring blood push using the auscultation method, rough blood flow will happen when the cuff pressure is better than the diastolic pressure and less than the systolic pressure. The "tapping" sounds associated with the turbulent flow are recognized as Korotkoff sounds. Remember the these sounds space not come be puzzled with the heart sounds produced by the opening and closing of the love valves.

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Summary of the auscultatory method: initially the cuff is inflated come a level higher than the systolic pressure. Therefore the artery is totally compressed, there is no blood flow, and also no sounds are heard. The cuff pressure is progressively decreased. In ~ the point where the systolic press exceeds the cuff pressure, the Korotkoff sound are very first heard and blood passes in turbulent flow through the partly constricted artery. Korotkoff sound will continue to be heard as the cuff press is additional lowered. However, when the cuff push reaches diastolic pressure, the sound disappear. Now at all points in time during the cardiac cycle, the blood press is better than the cuff pressure, and also the artery remains open.
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