how sphygmomanometer record readings when blood flows trough arteries.
Answers
Explanation:
How To Use a Sphygmomanometer
Procedures
To begin blood pressure measurement, use a properly sized blood pressure cuff. The length of the cuff's bladder should be at least equal to 80% of the circumference of the upper arm.
Wrap the cuff around the upper arm with the cuff's lower edge one inch above the antecubital fossa.
Lightly press the stethoscope's bell over the brachial artery just below the cuff's edge. Some health care workers have difficulty using the bell in the antecubital fossa, so we suggest using the bell or the diaphragm to measure the blood pressure.
Rapidly inflate the cuff to 180mmHg. Release air from the cuff at a moderate rate (3mm/sec).
Listen with the stethoscope and simultaneously observe the dial or mercury gauge. The first knocking sound (Korotkoff) is the subject's systolic pressure. When the knocking sound disappears, that is the diastolic pressure (such as 120/80).
Record the pressure in both arms and note the difference; also record the subject's position (supine), which arm was used, and the cuff size (small, standard or large adult cuff).
If the subject's pressure is elevated, measure blood pressure two additional times, waiting a few minutes between measurements.
A BLOOD PRESSURE OF 180/120mmHg OR MORE REQUIRES IMMEDIATE ATTENTION!
Precautions
Aneroid and digital manometers may require periodic calibration.
Use a larger cuff on obese or heavily muscled subjects.
Use a smaller cuff for pediatric patients.
For pediatric patients a lower blood pressure may indicate the presence of hypertension.
Don't place the cuff over clothing.
Flex and support the subject's arm.
In some patients the Korotkoff sounds disappear as the systolic pressure is bled down. After an interval, the Korotkoff sounds reappear. This interval is referred to as the "auscultatory gap." This pathophysiologic occurrence can lead to a marked under-estimation of systolic pressure if the cuff pressure is not elevated enough. It is for this reason that the rapid inflation of the blood pressure cuff to 180mmHg was recommended above. The "auscultatory gap" is felt to be associated with carotid atherosclerosis and a decrease in arterial compliance in patients with increased blood pressure.
Answer:
A sphygmomanometer has three parts: a cuff that can be inflated with air, a pressure meter (manometer) for measuring air pressure in the cuff, and. a stethoscope for listening to the sound the blood makes as it flows through the brachial artery (the major artery found in your upper arm).
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