Dear Humam Hamada Muslih
please see the link. I hope this might be helpful for better understanding.
https://www.sciencedirect.com/topics/nursing-and-health-professions/hypertensive-crisis
It is a common condition in the emergency rooms and polyclinics in the hospitals. It is the blood pressure in the arms BUT NOT in the brain actually. The vascular endothelium all over the body works as a clever organ while decreasing blood flow in the peripheral organs, it increases blood flow of the central ones such as the brain due to the stressfull conditions of the body. And most of the conditions can be explained by the fact that WHITE COAT HYPERTENSION. Such patients' home blood pressure measurements are normal in most f the time. But the white coat hypertension is an indicator of excess weight and many consequences of the metabolic syndrome in the future actually.
Arterial pressure must decrease slightly when the measurement is made at a greater distance from the heart, but (by far) the largest decrease in pressure is across the flow-controlling arterioles of each organ or tissue. It is reasonable to assert that steady-state mean arterial pressure measured in any artery is a good estimate of mean arterial pressure anywhere else. Accounting for gravity is a subtle secondary issue, but that is another question.
If you mean, measuring the blood pressure in a non-invasive way, I found recently a device that can be used.
Article Use of non-invasive intracranial pressure pulse waveform to ...
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