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What is the important difference between measuring the blood pressure invasive and non-invasive? (regarding the measurement...

What is the important difference between measuring the blood pressure invasive and non-invasive? (regarding the measurement element).
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Invasive blood preassure monitoring is commonly used in the itensive care unit as well as iperation theatre.By this method preassure is measured directly from the artery with the help of a cannula.The cannula is connected to a sterile fluid filled system ,which is connected to an electronic monitor.By this method blood pressure is constanly monitored beat by beat and displayed in a waveform.On the other hand non invasive BP measurement provides either intermittent or continues readings,an occluding upper arm cuff is used for intermittent non invasive monitoring.No sifnificant statistical difference in mean arterial preasure between invasive and non invasive blood preassure measurement.

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