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大家好，我是安阳道简医院的医生郑俊博，今天给大家聊聊左右手血压不一样，该相信哪一边？

在家测量血压，左右手测量血压数值不一样时？这时候我们该相信哪一边的手臂？

一、左右手血压应该一样吗？

人体左右手两侧的血压并不是完全一致的，通常情况下，人体右手测量出来的血压往往稍高于左手。左右手的血压差正常会在5-10mmHg，但如果超过10mmHg，则说明身体可能出现某种疾病。有相关研究表明：双侧上臂血压存在差异明显者，很可能患有某种血管疾病，双侧上臂血压差距超过10mmHg时，死于血管疾病的风险比一般人高出70%，并且无论哪侧上臂血压高，该结论都成立。

二、为什么左右手的血压会不一样？

左右手测量的血压差异过大，常见的原因有：主动脉夹层、血管炎（如多发性大动脉炎等风湿性疾病）、严重的动脉粥样硬化（如造成锁骨下动脉、肱动脉血管的狭窄）、先天动脉畸形等因素。此外脑梗塞后遗症，偏瘫侧的血压也会较健侧血压低。

三、左右手测量血压差异过大会有影响吗？

如果左右手测量结果差异在10mmHg以内的话，属于正常的误差范围，并不能说明身体有什么问题。但是，如果左右手测量血压差异过大的话（超过10mmHg），就不能忽略不管了。上述原因中，无论是粥样硬化还是主动脉夹层，都可能危及患者的生命！一旦发现左右手血压差值过大，还是建议尽快至医院查明病因。

四、如果左右手血压有差异，应该“信”哪个？

答案是：信“高”，勿信“低”。因为较“低”的血压是由于病理状态降低了血管壁的压力，并非人体内的真实血压。较“高”的血压才是更接近体内真实血压的数值。

还有就是，在测血压时，如果两只手臂的血压相差不大，也要不定期测量一下不常测量的那一只手的血压~这样才能更全面的掌握自己身体的健康状况！

【英文版】

If the blood pressure values measured by the left and right upper arms are different, which side should we trust?

Dear friends, nice to meet you!My name is Zheng Junbo, a doctor of Anyang Daojian Hospital.Today, I'd like to talk to you about which side should we believe if the blood pressure measurement results of left and right upper arms are different?

When blood pressure is measured at home, which side of the upper arm should we believewhen the blood pressure measurement values of the left and right upper arms are different?

1、 Should the left and right upper arm blood pressure levels be the same?

The blood pressure of the left and right upper arms is not identical.Usually, the blood pressure measured by the right upper arm is slightly higher than that of the left upper arm. The difference of blood pressure between the left and right upper arms is normal, which is 5-10mm Hg,but if it is more than 10mm Hg, it indicates that the body may have some diseases.

Relevant studies have shown that, patients with significant difference in blood pressure of bilateral upper arms are likely to suffer from certain vascular diseases. When the blood pressure difference of bilateral upper arms is more than 10mm Hg, the risk of death from vascular diseases is 70% higher than that of ordinary people, and this conclusion is tenable no matter which side of upper arm blood pressure is higher.

2、 Why is the blood pressure of left and right upper arm different?

When the blood pressure difference between the left and right upper arms is too large,the common causes are aortic dissection, vasculitis (such as rheumatic diseases as Takayasu arteritis), severe atherosclerosis (such as the stenosis of subclavian artery and brachial artery), congenital artery malformation, etc. The blood pressure of the hemiplegic side is lower than that of the healthy side.

3、 Does the difference of blood pressure measured by left and right upper arms affect the human body?

If the difference between the measurement results of the left and right upper arms is within 10mm Hg, it belongs to the normal error range, and it does not indicate that there is any problem with the body.However, if the blood pressure difference between the left and right upper arms is too large (more than 10mm Hg),it can not be ignored.In the above reasons, whether atherosclerosis or aortic dissection, may endanger the lives of patients! Once the difference between left and right upper arm blood pressure is found to be too large, you are recommended to go to the hospital as soon as possible to find out the cause.

4、 If there is a difference in blood pressure between the left and right arms, which one should be based on?

The answer is, we should base our measurements on the side with higher blood pressure, not on the side with lower blood pressure.Because the lower blood pressure may be due to the pathological state reducing the pressure on the blood vessel wall, rather than the actual blood pressure in the human body. A higher blood pressure may be closer to the true blood pressure in the body.

In addition, when measuring blood pressure, if the blood pressure on both sides of the upper arm is not different, you should also measure the side of the upper arm that is not often measured regularly, so as to master the health status of your body more comprehensively.