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Auscultatory method
In the auscultatory method, a stethoscope and a sphygmomanometer are used. In this method, an inflatable cuff is placed around the upper arm, at roughly the same vertical height as the heart. This cuff is attached to mercury. The cuff is inflated manually by squeezing a rubber bulb repeatedly until the artery is completely occluded.
The pressure in the cuff is slowly reced. When the blood starts flowing again, a whooshing or pounding sound is heard. The pressure at this point is called systolic pressure. Then the pressure in the cuff is further reced, till no sound is heard. The pressure at this point is called diastolic blood pressure.