why take blood pressure in left arm

Generally, a small difference in blood pressure readings between arms isn't a health concern. However, a difference of more than 10 millimeters of mercury (mm Hg) for either your systolic pressure (top number) or diastolic pressure (bottom number) may be a sign of an underlying problem such as narrowing of the main arteries to that arm. If you have a significant difference in blood pressure readings between arms, talk to your doctor. A difference of 10 to 15 mm Hg for systolic pressure that shows up repeatedly is a risk factor for vascular disease and for a greater risk of developing cardiovascular disease and related complications during the next 10 years. Your doctor may measure your blood pressure in both arms to see if you have high blood pressure (hypertension). If your blood pressure is higher in one arm, your doctor will probably use the blood pressure reading from that arm to monitor your blood pressure.

A large difference in blood pressure measurement between your arms could signal a health problem, such as:
Sept. 23, 2015 Part of the reason the left arm is preferred is because it is closer to the heart; also, it is part of standardization. If you are wanting to see changes in your BP over time, then you want to measure it the same way (same time of day as well) each time. One reason to look at BP in both arms is to look for large differences that might be indicative of some sort of circulatory issue. Within a minute or so, the restrictive forces in re-taking a BP would be gone and you would could get a similar reading. The real concern with most BP units of the manual type are calibration and operator error.

The calibration can be way, way off and it is really impossible to tell without checking it against some standard. I disagree that at rest a trained person's systolic pressure would be higher. This really goes against a reason for people to exercise (that is to lower BP). In fact, a trained person might have a lower systolic because the blood vessels are not going to be as restrictive to the flow of the blood. I am not sure how many BP measures 123 has done, but systolic pressure during exercise can be very, very high. At a high HR, the venous return is still very high. While the LV might not be filling completely the rate is such that the time between beats is very small so the pressure remains high and near constant.

Diastolic pressure will decrease or stay the same (rarely rise) because of vasodilation from other factors at work on the smooth muscle of the vessels. Some people do look more closely at diastolic pressure in terms of CV disease for some of the reason you note. Also a t rest (which is where we spend 22+ hours of the day) your diastolic pressure is the pressure exerted on the artery walls 2/3 of the time. In some ways that is more strain than the occasional pulse of high pressure blood coming by. As for the penis issue, blood flow is restricted to the penis most of the time. Not really sure that this has to do with the issue at hand other than some BP meds create erectile dysfunction and it seems like many of the posters here think with their dicks.

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