Sphygmomanometers indicate a patient's blood pressure by measuring mean arterial pressure and then calculating systolic and diastolic measurements. The device is composed of a dial, pump, cuff and valve. Once the cuff is inflated, it applies pressure to the brachial artery.Continue Reading
A medical professional wraps the cuff around a patient's upper arm, inflates the pump, places the chestpiece of a stethoscope under the cuff and then slowly releases the pressure by adjusting the valve. As pressure is released, the systolic measurement is noted when the blood begins to flow again. The medical professional is able to detect this by sound through the stethoscope. The diastolic reading is taken at the point at which the heart relaxes and blood flow returns to normal, which is also detectable by sound.
When the systolic and diastolic measurements are high, it indicates the heart is pumping excessively hard, a sign that blood vessels are constricted or partially clogged with plaque. Other causes of blood vessel constriction include high levels of adrenaline.
Samuel Siegfried Karl Ritter von Basch invented the sphygmomanometer in 1881. The device's name is derived from the Greek world "sphygmos," which means "pulse," and the scientific term "manometer," which refers to a means of measuring pressure.Learn more about Medical Ranges & Levels
Systolic blood pressure values above 120 and diastolic blood pressure values above 80 are considered high, according to WebMD. Values between 120 and 139 for systolic, and 80 and 89 for diastolic blood pressure, indicate prehypertension. Values above 140 and 90, respectively, are indicative of hypertension, or high blood pressure.Full Answer >
Normal systolic and diastolic values on a blood pressure chart read below 120 and below 80 millimeters of mercury, respectively, according to the American Heart Association. The systolic value measures arterial pressure as the heart beats, while the diastolic value is that of arterial pressure as the heart is resting.Full Answer >
A blood pressure reading of 150 over 100 millimeters of mercury indicates that a person may have severe hypertension, according to Mayo Clinic. A physician takes at least two-to-three blood pressure readings before she diagnoses an individual with hypertension.Full Answer >
Customer ratings for blood pressure monitors are available at Amazon.com. Reviews of the best blood pressure monitors are also available from the Medical News Today website.Full Answer >