Correlation of Invasive and Non-Invasive Central Aortic Pressures in Patients Undergoing Diagnostic Coronary Angiogram

Central aortic pressure (CAP) is pathophysiologically more relevant than peripheral brachial pressure for predicting cardiovascular risk. Recording of  CAP can be acquired invasively and non- invasively. Study aim was to compare SphygmoCor® derived non-invasive  CAP with invasive  CAP. In 50 eligible patients, non-invasive CAP was recorded using applanation tonometry with SphygmoCor andinvasive  CAP were recorded using Recor pressure Recording system. Mean systolic CAP by non-invasive and invasive techniques were 116.1± 15.18 & 121.04 ± 16.6 mmHg respectively and mean diastolic CAP by non-invasive and   invasive techniques  were  76.66 ± 9.32 mmHg & 78.14 ± 7.58mmHg respectively. Non-invasive CAP underestimated catheter-measured central systolic pressure by 4.9 mmHg and diastolic pressure by 1.5 mmHg as analysed by Bland-Altman plot. High correlation was observed between non-invasive and invasive systolic and diastolic blood pressures (r = 0.74,  r = 0.74 respectively). Non-invasive CAP were found to be in agreement with invasive CAP .