Canadian scientists conducted a study on home blood pressure monitors. The results are discouraging: in 70% of the devices for pressure measurement show incorrect data, which can be extremely dangerous for patients with hypertension. As according to Medportal with reference to MedicalXpress , to such conclusion the Professor of medicine from the University of Alberta (University of Alberta) Jennifer Ringrose (Jennifer Ringrose).
– Pressure problems are a major cause of death and disability in the world, – says the researcher. The scientist believes that careful monitoring of the pressure can reduce the critical consequences of hypertension – but only if pressure measurements are accurate.
Ringrose colleagues tested dozens of home blood pressure monitors. It turned out that in 70% of cases, the error was about 5 mm Hg. article and 30% is about 10 mm Hg.St. Since doctors often rely on the testimony of a home tonometer that inform them of patients, limited to a single measurement of pressure during admission to the clinic, due to such inaccuracies, the severity of the disease may be considerably underestimated.
In addition, both doctors and patients should consider that the inaccuracy of the pressure measurement home blood pressure monitor can be invoked not only the instrument error, but also other factors such as different disturbance created by the movements of hands and body, incorrectly buttoned cuff, weight of the patient, his emotional state, and even the conversation during the measurement.
Study co-author Jennifer Ringrose, Professor of medicine at the University of Alberta Raj Padwal(Raj Padwal ) emphasized that doctors in any case should not prescribe medicines on the basis of only one or two dimensions.
Earlier Canada had conducted a similar study on a group of 85 patients. Researchers compared data obtained as a result of the pressure measurements home blood pressure monitors, with test measurements in the clinic simultaneously by two observers with a third controller comparing the measured time between them. It turned out that the difference between the readings of home and clinical blood pressure monitors have been clinically significant. Moreover, the study revealed that the testimony, which was shot in men differed less accuracy than those who took women.
How can we minimize the error of indication of AD, using home blood pressure monitors:
- Never measure the pressure, his hand in the air.
- Try to measure the pressure in a calm state. Not to talk or move during measurements.
- The cuff of the device must be at the heart level of the patient: if it will go down below heart level, the readings will be high.
- Do not apply the cuff on the rolled up sleeve dress – the fabric can pinch blood vessels, distorting the result.
- Pick a cuff that is appropriate for your physique: the width of the cuff should be about 40% of the circumference of the hand (about 12-14 cm) and the length of the pneumatic chambers of the cuff should be at least 80% of hands (about 18-26 cm). Short and too narrow cuffs also greatly distort the readings.
- Possibly once a year check your blood pressure, comparing his evidence with clinical attorney instrument. In addition, there is the opportunity to give a tonometer for calibration in the Metrology laboratory.
- To increase the measurement accuracy it is recommended to make several measurements, and the interval between them should be at least 7-10 minutes: this will allow the blood vessels to restore the elasticity after the previous measurement.