… Continuing …
This method uses the pressure pulsations taken from the measurements to display the range of your systolic and diastolic pressure.
After inflating the cuff for about 30 points (mm Hg) higher than the expected level of your systolic pressure, the system then will start to record the pressure pulsations – and then as the cuff is continuously deflated, the blood flow inside your arteries is getting back normal!
The pulsations arise in amplitude until MAP is accomplished – MAP stands for ‘Mean Arterial Pressure’. In the method with oscillometric, mean arterial pressure is determined by taking the released pressure from the cuff when the largest amplitude of the pulse occurs.
There are lots of brands of digital monitors. And the algorithms used to determine the systolic and diastolic pressure can vary from developer to developer.
But though there are different algorithms, they should provide the same result in measuring systolic and diastolic pressures. In the FreeScale blood pressure monitor:
- The calculation of systolic pressure is determined from the pressure measurement taken in the cuff when the pulse with about 70 percent of the mean arterial pressure (MAP)’s amplitude occurs and while the level of the cuff pressure is higher than the MAP value.
- And for diastolic pressure. It is determined from the cuff pressure registered of while the cuff pressure is lower than the MAP value and when the pulse with about 50 percent of the MAP’s amplitude appears.
* Image credit to ‘Getty RF Images’ for illustration