Lab Report: Blood Pressure, Pulse, and Body Position

Lab Report: Blood Pressure, Pulse, and Body Position

Lab Report: Blood Pressure, Pulse, and Body Position

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Abstract 

Blood pressure readings differ depending on the location of measurement and the position of the subject. The purpose of this experiment was to measure blood pressure and pulse in the upper and lower limb and determine any difference. Also, the variations in subject’s position were also measured. The results showed that blood pressure was higher in the lower arm compared to the upper arm. Also, the pressure was high when the arms were low as compared to when they were lifted high.

Introduction

Blood pressure readings are used to estimate an individual’s risk level to the cardiovascular diseases. The normal systolic blood pressure should range between 90 and 120mmHg while the diastolic pressure should be between 60 and 80mmHg. People with blood pressure higher than 120/80mmHg are considered prehypertensive and those with less than 90/60mmHg are considered hypotensive. Various factors affect the blood pressure readings. The arm’s position and the body position have an important role in determining the blood pressure values. The purpose of this study is to measure blood pressure, pulse and determine how they vary with body positions.

Method: Lab Report: Blood Pressure, Pulse, and Body Position

The lab started with the measuring the upper arm blood pressure by putting the BP-600 on the upper arm of the subject. The arrow of the cuff was aligned over the subject’s brachial artery. The subject was told to rest in a supine position as the measurements were taken. The record button on the LabScribe Main window was clicked and the signal began scrolling down. The calibration at 70 mmHg was typed in the Mark box of the Mark button and the pressure inflated in the cuff to the set value. The AutoScae button on the Pulse and Blood pressure channel was then clicked to take the measurements. The pressure in the cuff was marked by pressing the Enter Key. The output of the BP-600 was taken at 70mmHg for 15 seconds before the pressure on the cuff was increased. The calibration mark was changed to 140mmHg and the measurements taken accordingly. The collected voltages were converted to pressure values. The measurements were taken on the upper arms and lower arms. The systolic and diastolic measurements were taken accordingly. The exercise was repeated for different arms and hand positions and the results recorded accordingly.

Results

Subject:

Cuff location/hand positioThen

Systolic Pressure (mmHg) Diastolic Pressure (mmHg) Pulse Pressure (mmHg) BP class
Upper left arm/hand low Ex1. 108 86 Normal
Upper Left Arm/Hand Low, Ex.2
Upper Right Arm/Hand Low 115 84 Normal
Lower Right Arm/Hand Low 122 86 Prehypertensive
Left Arm/Left Hand Low      
Left Arm/Right Hand High 118 97 Normal
Left Arm/Left Hand High 94 72 Normal

 

Discussion and Conclusion

The blood pressure readings for the legs are different from the upper arm readings. The results indicated that both the systolic and diastolic readings were slightly higher in the lower limb as compared to the upper limb.   The differences in the pressure readings are cause by variations in the anatomical proximities to the heart. The blood pressure readings from the lower extremities are good for assessing cardiovascular health risk. Also, it was noted that the blood pressure readings varied when the subject reclined and when they lifted their hands or legs. The results indicate that posture also affects blood pressure readings. Lowering the hands below the heart results in increased blood pressure while lifting hands above the heart lowers the blood pressure. Physiologically, the blood pressure changes with about -0.77mmHg when the distance between the cuff and phlebostatic axis moves by 1cm.  Additionally, the changes in the hydrostatic pressure also affected the final blood pressure readings.

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