Blood pressure oximeters are the most commonly used auxiliary tool for self-measurement of blood pressure in hospital departments and families. Wrong measurement methods will not only cause unnecessary “hypertension” in normal people, but also affect the time, dosage, and compliance of hypertensive patients. Today, I compiled the 8 points of attention when measuring blood pressure oximeters and related knowledge of electronic sphygmomanometers.

8 Points to Ensure the Accuracy of blood pressure oximeters

The pre-measurement preparation, posture, sitting posture, cuff specifications, etc. are the same as those of a desktop mercury sphygmomanometer. However, the blood pressure measurement of an oscillometric electronic blood pressure oximeter has some special features. Attention should be paid.

Cuff Placement

The cuff also takes into account the function of blocking blood vessels and signal sensing. Therefore, the proper cuff and proper placement of the cuff are more important.
• The cuff should not be placed at the elbow joint. The cuff placed here cannot fit the upper arm completely, and there is a large gap. At the same time, the movement of the elbow may cause the error of blood pressure measurement.
• The cuff tube cannot be suspended in the air and should be placed securely.

Blood Pressure Oximeters

Try to avoid physical activity

Body movement and limb activity during measurement will seriously affect the accuracy and repeatability of blood pressure readings. Because the cuff pressure change that the oscillometric electronic sphygmomanometer relies on is very small. Any interference will affect the signal collection. In addition to active hand movements, passive movements such as ambulance vibration and bed movement may also affect the accuracy of blood pressure readings.

Strong or weak pulse

When the pulse is weak, the accuracy of the oscillometric electronic sphygmomanometer to measure blood pressure is questionable, such as patients with shock, hypovolemia and peripheral vascular disease. In addition, the oscillometric electronic sphygmomanometer encounters challenges in neonatal blood pressure measurement, which requires a special design to solve such problems.

Environmental noise

Environmental noises such as ambulance moving signals are sometimes greater than the physiological pulse signals that need to be detected, causing measurement errors. Fortunately, the current oscillometric electronic sphygmomanometer has sound insulation, which can reduce the interference of environmental noise to a certain extent.

Heart rate variability

Although the existing oscillometric electronic sphygmomanometers have a certain degree of heart rate variability in their design, the more serious performance of the heart rate variability obviously affects the accuracy of the blood pressure measurement of the oscillometric electronic sphygmomanometer. The most obvious example is atrial fibrillation. In the past, some scholars believed that the oscillometric electronic sphygmomanometer was not suitable for patients with atrial fibrillation, because the pulse wave of patients with atrial fibrillation was irregular, and the calculation method of systolic and diastolic blood pressure based on sinus rhythm was not suitable for atrial fibrillation. In fact, a desktop mercury sphygmomanometer cannot accurately measure the blood pressure of patients with atrial fibrillation.

Other diseases that affect the measured value

Diabetes, renal failure, pre-eclampsia, peripheral vascular disease and other changes in vascular performance may also affect the accuracy of the oscillometric electronic sphygmomanometer to a certain extent. In order to further solve such problems, it is necessary to optimize the system program based on the measurement data of a large number of patients to obtain a more reliable calculation method.

Problems with the electronic sphygmomanometer

Some poor quality oscillometric electronic sphygmomanometers have relatively poor accuracy and stability due to the lack of large-scale data certification due to the quality of their components and system procedures. When the battery is nearly exhausted and the voltage is low, blood pressure measurement may be inaccurate. Only those oscillometric electronic sphygmomanometers verified by international standards can be used in clinics and homes.
At present, there are 3 internationally recognized medical clinical measurement verification schemes for electronic sphygmomanometers: (1) American Medical Device Federation scheme; (2) British Hypertension Association scheme; (3) European Hypertension Association scheme. The oscillometric electronic sphygmomanometer certified by international standards can be used in clinical diagnosis and related research. The International Pediatric Association also pays attention to the oscillometric electronic sphygmomanometer. The quality of commercially available upper-arm sphygmomanometers varies from good to bad. Whether the product has passed the verification of relevant agencies can be checked online.

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