Components of blood pressure Sample Clauses

Components of blood pressure. Non-invasive brachial artery blood pressure measurements form an important part of cardiovascular risk assessment in everyday clinical practice. The systolic blood pressure (SBP) and diastolic blood pressure (DBP) values obtained from these measurements represent the peak and the nadir of the brachial arterial pressure waveform. An alternative way of characterising the waveform, which may offer more insight into the haemodynamics, is by steady state component, mean arterial pressure (MAP), the pressure averaged over one cardiac cycle and the pulsatile component (PP), the difference between SBP and DBP.18 SBP and PP are dependent on both MAP and DBP with the exact relation being dependent on the form of the pulse wave but MAP is closer to DBP than SBP, so that SBP is influenced more by the PP, than is DBP. PP represents the pulsatile load exerted on the heart and large arteries and increases along the length of large arteries – a phenomenon termed pulse pressure amplification.18 Thus in health brachial artery PP (and SBP) may be 20mmHg higher than the aortic SBP.19 The steady state blood pressure components DBP and MAP, however stay relatively constant with a small fall in MAP of 1-2 mmHg in the peripheral circulation.20 DBP has traditionally been viewed as the most important clinical parameter in hypertension as it is closely related to total peripheral resistance (TPR), an increase in which is thought to be the hallmark of hypertension.
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