Blood Pressure and Its Measurement Blood Pressure What
Blood Pressure and Its Measurement
Blood Pressure – What is It? When the heart contracts • blood is forced through the arteries • blood pressure is maximum systolic pressure • typical value: 120 mm. Hg
Blood Pressure – What is It? When the heart contracts • blood is forced through the arteries • blood pressure is maximum systolic pressure • typical value: 120 mm. Hg When the heart muscle relaxes • blood pressure is minimum • typical value: 80 mm. Hg diastolic pressure
Blood Pressure – What is It? When the heart contracts • blood is forced through the arteries • blood pressure is maximum systolic pressure • typical value: 120 mm. Hg When the heart muscle relaxes • blood pressure is minimum • typical value: 80 mm. Hg diastolic pressure Typically the blood pressure is quoted as 120/80 mm. Hg
Blood Pressure – What is It? When the heart contracts • blood is forced through the arteries • blood pressure is maximum systolic pressure • typical value: 120 mm. Hg When the heart muscle relaxes • blood pressure is minimum • typical value: 80 mm. Hg diastolic pressure Typically the blood pressure is quoted as 120/80 mm. Hg High blood pressure: either of these pressures is higher than this value Variations during a typical day: 30 to 40 mm. Hg (therefore measure under standard conditions)
Direct Measurement of Blood Pressure • the most accurate way to measure pressure • not the most convenient A barometer is attached to the vein in the horse’s neck. http: //www. drbloodpressure. com/05 -mesurer. shtml
Indirect Method • Requires no holes in the patient • Requires no long tubes measure blood pressure cuff – pressure in the cuff equals pressure in the artery listen to blood movement noise
Measuring Blood Pressure This is where a student volunteer demonstrates how to measure blood pressure.
Measure Blood Pressure http: //www. drbloodpressure. com Shut off blood flow reduced blood flow noise Measure cuff pressure as it decreases blood flow starts noise increases Blood flow noise continues mm Hg Blood flow noise levels off when the artery is fully open
http: //www. drbloodpressure. com/05 -mesurer. shtml Alternative – Measure Size of Oscillations Caused by Blood Flow blood pressure decreases blood flow starts no further increase in blood flow • less accurate than previous method • well suited to regular, automatic measurement
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