When the pulse is no longer audible the pressure in the heart is relaxed and

When the pulse is no longer audible the pressure in

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pressure. When the pulse is no longer audible the pressure in the heart is relaxed, and relates to diastolic pressure. The purpose of this activity is to determine systolic and diastolic pressures to evaluate patient health. Measuring blood pressure can diagnose any health problems early. Blood pressure measurements produce two readings. The systolic number is when the heart contracts, this will be on the top. The diastolic number is the bottom one. Blood pressure is measured in millimeters of mercury (mm Hg). mmHg : systolic / diastolic The numbers together indicate whether blood pressure in a patient is healthy. The range considered as healthy blood pressure in adults is below 120 systolic and 80 diastolic. Blood pressure between 120 to 139 systolic or 80 to 89 diastolic is considered prehypertension, which is a warning sign to developing high blood pressure, also known as hypertension. Stage 1 high blood pressure is 140 to 150 systolic or 90 to 99 diastolic. Stage 2 high blood pressure is 160 or higher systolic or 100 or higher diastolic. Hypertensive crisis is 180 or higher systolic or greater of 110 diastolic.
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Blood pressure does vary from individual to individual, and fluctuates throughout the day. Blood pressure is also effected by body position which normally drops in the standing position compared with the sitting, supine and supine with crossed legs. In most cases blood pressure is commonly measured in the seated or supine position, changes in body positions can give different measurement values. Since the heart is a pump, it takes less work to pump blood to the arm when we are lying down. This is because the arm is about the same level as our heart. Blood pressure can also be effected during exercise. Exercise increases systolic blood pressure, as the heart starts to pump faster to deliver oxygen to muscles. Becoming more active can lower your systolic blood pressure by an average of 4 to 9 millimeters of mercury (mm Hg) [3]. The systolic and diastolic pressure values can also be used to determine the mean arterial pressure (MAP), and pulse pressure. Pulse pressure can be helpful in determining the stroke volume, or blood ejected by the left ventricle and the resistance in the arteries. Pulse pressure can be calculated by subtracting the diastolic pressure from the systolic pressure. The MAP determines the average rate of blood flow in the systemic arterial circuit as well as stress the blood vessels are subject to. MAP = pulse pressure + diastolic blood pressure / 3 For this experiment, blood pressure measurements will be taken in a resting state in both a sitting and laying down position. Since there is less gravity to overcome in a laying down position, I predict that the heart will pump a lower systolic blood pressure when compared to sitting down.
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  • Spring '08
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