Why is there a seven to eight point difference in a person's blood pressure when their blood pressure is taken back and forth at the same time as their right hand?
Why is there a seven to eight point difference in a person's blood pressure when their blood pressure is taken back and forth at the same time as their right hand? 
Clinical practice has found that the blood pressure of the right hand is usually higher than that of the left hand by about 10-20 mmHg, the reason being that the blood pressure of the brachial artery is measured when the blood pressure of the human body is measured. The right hand and the left hand of the brachial artery from different arterial branches, the right hand brachial artery from the branch of the head arm trunk, and the head arm trunk is a large branch of the aorta; the left hand artery from the left subclavian artery, therefore, the head arm trunk of the blood pressure than the left subclavian artery blood pressure to be higher, the measurement of the human body's blood pressure is the right hand of the blood pressure than the left hand of the blood pressure to be higher. The right hand blood pressure is higher than the left hand blood pressure difference in clinical many doctors are not very clear.
Currently, in clinical practice, we usually focus on measuring blood pressure indicators in the right upper arm. The normal blood pressure range is (90-140)/(60-90) mmHg, and the pulse pressure difference is between 30mmHg and 40mmHg. It is worth noting that if the difference between the blood pressure of the right and left hands is too large, it is very easy to induce cardiovascular and cerebrovascular diseases. And cervical spondylosis, arteriosclerosis, hyperthyroidism and other diseases, will also cause different parts of the body's blood pressure abnormal difference.
It is not surprising that there is a difference in blood pressure values measured in the left hand and right hand!
The human heart is slightly to the left of the chest cavity, and the choice of the left or right arm for blood pressure measurement should be based on the condition of the strength of the pulse in both arms of the subject.
If the strengths are equal, the right arm is usually chosen for measurement, and if the strengths of the pulses in the two arms are different, the arm with the stronger pulse is chosen for measurement.
rationaleYou are measuring your blood pressure to check for high blood pressure, so naturally you should choose the one with the highest value. Since most people use the right arm more, so the right arm pulse is stronger, choose to measure the right arm blood pressure is also more. However, the difference in blood pressure between the two arms should not be too large, usually within 10 to 15 mm Hg, the impact on the pulse pressure difference is not great; if the difference is more than 20 to 30 mm Hg, after discharging the measurement error, it is necessary to further examination, to clarify whether there is arteritis.
Errors are unavoidable, especially in taking blood pressure.
Many factors can affect the value of measured blood pressure.
A person's blood pressure values can vary when measured at different times of the day. Even the blood pressure values can change due to mood swings. There is also the measurement of blood pressure whenEach time the sphygmomanometer is strapped to a different part of the body, it will also affect the blood pressure measurement. There is also the difference between the two arms, which is inherently inaccurate because the blood circulation and the direction of the arteries in the two arms are different.
Finally, there is a more important factor, which is the quality of the sphygmomanometer or not, so different manufacturers produce sphygmomanometers that can measure significantly different results.
If the blood pressure is measured with a tabletop sphygmomanometer, the skill level of the person taking the measurement also affects the value of the blood pressure, for example, inability to hear the pulse tone when listening to the pulse is the biggest problem.
All the above are not exhaustive. Therefore, it is really not an easy task to measure blood pressure accurately.
How can I measure my blood pressure relatively accurately?
Personal advice:
Measurement with a tabletop sphygmomanometer early in the morning each day before getting out of bed is relatively accurate.
If you use a machine to measure, you need to choose a machine of acceptable quality as well.
Beyond that the errors are going to be significant and less accurate, and not much of a guide to medication.
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