Lower extremity blood pressure measurement can be used to measure blood pressure at the popliteal artery, usually the patient takes the lying position or prone position, exposing one side of the lower limb, and different sizes of cuffs are used to measure lower extremity blood pressure. Comparatively speaking, wide cuff is more preferable than narrow cuff, the general circumference is 32-42cm, applicable to the length of at least 32cm and the width of 17cm cuff airbag, sphygmomanometer cuff is 2cm wider than the cuff used for the upper limb, the cuff will be the lower edge of the cuff along the popliteal fossa on the 3-5cm of the flat winding. Obese patients cuff is not enough to wrap, you can wrap a wide cloth bag around the limb outside the cuff, the stethoscope chest piece on the popliteal artery pulsation, if you measure the upper limb cuff to measure the popliteal artery blood pressure, systolic blood pressure will be high.