Glorimetric Determination Of Blood Pressure Lab
Introduction: Systolic blood pressure, the highest pressure in the cardiac cycle, measures the pressure in the arteries as the left ventricle contracts. Diastolic blood pressure, the lowest pressure in the cardiac cycle, measures the pressure in the arteries as the ventricles relax and refill with blood just before the next ventricular contraction. We measure blood pressure using a sphygmomanometer and a stethoscope. To measure the systolic pressure, place the blood pressure cuff on the upper arm and inflate the cuff until blood flow in the brachial artery is stopped. Then we slowly release the pressure of the cuff until the systolic pressure in the artery is greater than the pressure of the cuff, which causes a tapping sound heard through
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In Exercise 2, we calibrated the Power Lab program to the blood pressure cuff. In Exercise 3, we estimated the systolic pressure in the upper arm using Korotkoff sounds and by finding the pressure corresponding to when blood flow began in the brachial artery. In Exercises 4 and 5, we estimated the systolic pressure in the forearm and calf using the same methods as Exercise 3. In Exercise 5, we measured systolic pressure while the volunteer was standing and lying down. In Exercise 6, we measured the distance between the heart and where the veins in the hands collapse to determine venous pressure. In Exercise 7, we measured the forearm circumference as the volunteer held their arm above their head with increasing cuff pressure.
Results: The average systolic and diastolic pressures for the four subjects were 114 mmHg and 78 mmHg. The systolic pressure measured by blood flow, 115.63 mmHg, was slightly lower than the systolic pressure measured by Korotkoff, 116.5 mmHg. The systolic pressure in the upper arm was 115.63 mmHg. The systolic pressure in the forearm was 110.78 mmHg. The systolic pressure in the leg when standing and lying down was 150.31 mmHg and 105.22 mmHg, respectively. The venous pressure was 19.12 mmHg. As seen in Graph 1, as cuff pressure increases, so does arm
In Exercise 2, we calibrated the Power Lab program to the blood pressure cuff. In Exercise 3, we estimated the systolic pressure in the upper arm using Korotkoff sounds and by finding the pressure corresponding to when blood flow began in the brachial artery. In Exercises 4 and 5, we estimated the systolic pressure in the forearm and calf using the same methods as Exercise 3. In Exercise 5, we measured systolic pressure while the volunteer was standing and lying down. In Exercise 6, we measured the distance between the heart and where the veins in the hands collapse to determine venous pressure. In Exercise 7, we measured the forearm circumference as the volunteer held their arm above their head with increasing cuff pressure.
Results: The average systolic and diastolic pressures for the four subjects were 114 mmHg and 78 mmHg. The systolic pressure measured by blood flow, 115.63 mmHg, was slightly lower than the systolic pressure measured by Korotkoff, 116.5 mmHg. The systolic pressure in the upper arm was 115.63 mmHg. The systolic pressure in the forearm was 110.78 mmHg. The systolic pressure in the leg when standing and lying down was 150.31 mmHg and 105.22 mmHg, respectively. The venous pressure was 19.12 mmHg. As seen in Graph 1, as cuff pressure increases, so does arm