Sphygmomanometer

A sphygmomanometer is an instrument used to measure systolic and diastolic blood pressure. Therefore it can be used to measure the blood pressure in the human body.

SphygmomanometerComponents

  • Inflatable cuff
  • A measuring unit (mercury manometer)
  • A mechanism for inflation
  • A manually operated bulb and valve
  • A stethoscope if the sphygmomanometer is manual.

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Types of Sphygmomanometer

  1. Manual sphygmomanometer
  2. Digital sphygmomanometer

Operation

  1. We wrap the cuff around the arm. At roughly the same vertical height as the heart. Because 
  2. Selecting the correct size of the cuff is very important. Too small a cuff results in too high a pressure. While too large a cuff results in too low a pressure because of the size of the cuff.
  3. While listening with a stethoscope to the brachial artery at the elbow, the examiner slowly releases the pressure in the cuff, therefore, releasing off pressure.
  4.  When blood flow first starts again in the artery, we hear a “whooshing” or pounding sound because of bb
  5. This sound is systolic blood pressure because it is systolic bp.
  6. Then we release the cuff pressure until the sound stops. This is recorded as the diastolic blood pressure because it is diastolic bp.

We use a stethoscope for the auscultatory method. The first continuous Korotkoff sounds identify the systolic blood pressure. The moment when Korotkoff sounds disappear identifies diastolic blood pressure.

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