Q: Does an electronic sphygmomanometer monitor accurately for blood pressure measurement? Which brand of sphygmomanometer is the most accurate?
There are two main types of electronic sphygmomanometers - arm and wrist blood pressure monitor. Both electronic sphygmomanometers are suitable for healthy people. But the wrist-type electronic sphygmomanometer is not suitable for patients with blood circulation disorders.
The upper arm electronic sphygmomanometers certified by AAMI, BHS, ESH are recommended for clinical and home blood pressure measurement.
Wrist sphygmomanometers are sometimes for patients who are obese and do not have a suitable cuff for measurement or elderly due to the inconvenience of undressing or in cold areas. Pay special attention to keeping the cuff of the wrist sphygmomanometer during use at the same level as the heart. In addition, patients with weak pulse and arrhythmia have errors when using a wrist sphygmomanometer.
Q: Will the blood pressure be higher or lower when the stethoscope is in the NIBP cuff? Is the blood pressure measurement high or low when the patient's sleeve is too tight?
A: Blood pressure measurement is when the mercury column rises to a certain height when inflating, the blood flow of the brachial artery is blocked, and then the mercury column rises 10-20 mm. When the stethoscope is in the cuff or the cuff is too tight, it means a certain pressure has been applied to block the blood flow, then the corresponding pressure exerted by the sphygmomanometer will not be so high. From this point of view, the blood pressure is low.
Q: Which one has higher blood pressure, arms or legs? Which hand has higher blood pressure, right or left?
A: In normal circumstances, the blood pressure difference between the two arms is about 10mmHg, and the lower limbs are 20-30 mmHg higher than the upper limbs. An experiment to monitor 100 healthy men and women with a mercury sphygmomanometer, calculate and compare the mean arterial pressure on the left and right sides. The results are that 32% of people have blood pressure on the right side lower than on the left side, 6% of people are the same for the right hand and the left hand, and the rest 62% of people have higher blood pressure on the right hand than on the left hand.
According to the principle of blood pressure formation, leg blood pressure is higher than arm blood pressure. A study comparing extremity blood pressure in healthy young adults found that blood pressure in the thigh was 20/16 mm Hg higher than that in the upper arm. And it was found that as the blood pressure difference of the left and right upper arms, there was also a difference in the blood pressure of the two thighs.
Q: Should blood pressure be measured twice?
A: According to some surveys, the first blood pressure measurement is often high, which may be related to the white coat effect, so it is best to measure the blood pressure twice on the same limb with 1 to 2 minutes an interval. If the difference between the two measurements is more than 5mmHg, a third measurement is required.
About 20% of the difference in blood pressure between the left and right arms is >10 mm Hg. Therefore, we have to measure blood pressure on the left and right hands for the first time. Twice for each hand, and the side with higher blood pressure is the upper limb for blood pressure measurement. Limb blood pressure measurements should be performed when the blood pressure difference (systolic blood pressure) between the two arms is >20 mm Hg.
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