Invasive blood pressure monitoring is not affected by external factors such as artificial pressure, decompression, cuff width and tightness, accurate and timely, and easy to do arterial blood gas analysis. It is considered as the gold for blood pressure measurement during perioperative and shock. standard.
However, at present, the non-invasive method is still the most commonly used blood pressure measurement method in clinical practice. However, in some cases, there is a large error between non-invasive blood pressure and invasive blood pressure, which affects the judgment and treatment of the disease. Today we talk about invasive blood pressure and non-invasive blood pressure. The difference between the two.
Familiar strangers – do you know how non-invasive blood pressure is measured?
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Non-invasive blood pressure detection methods mainly include Korotkoff sound method, oscillation method and arterial transit time method.
The multi-parameter monitor non-invasive blood pressure measurement method generally adopts the oscillation method. The principle is as follows: the cuff that is tied to the arm is used to inflate the cuff through the air pump to block the pulsation propagation in the blood vessel to reach a certain pressure (generally 124) ~316kPa) Start deflation. When the air pressure reaches a certain level, the blood flow can pass through the blood vessel, and there is a certain oscillating wave, gradually deflated, the oscillating wave is getting bigger and bigger, and then deflated due to the contact between the cuff and the arm. The looser, so the pressure and fluctuations detected by the pressure sensor are getting smaller and smaller. The pressure sensor can detect the pressure and fluctuation in the cuff in real time. We assume that the time when the maximum fluctuation is selected is the reference point, based on this point. The forward search is the fluctuation point of the peak value of 0.45, which is the high pressure (ie, the systolic pressure), and the backward looking for the fluctuation point of the peak value of 0.75, which corresponds to the low pressure (ie, diastolic pressure) and the highest fluctuation point. The corresponding pressure is the average pressure.
The principle of invasive arterial blood pressure testing, ie, radial artery puncture, is to monitor the arterial systolic pressure, diastolic blood pressure, and mean arterial blood pressure by placing the cannula in a direct monitoring of the surrounding arteries.
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