Abstract 16149: Central Systolic Blood Pressure Estimated by an Osillometric Method or From an Invasive Brachial Pressure Waveform: A Direct Comparison
OBJECTIVES: The accuracy of noninvasively estimated central systolic blood pressure (SBP) remains controversial. The present study investigated the accuracy of a new oscillometric method by direct comparison with the analysis of the invasive brachial pressure waveform.
METHODS: We enrolled 50 patients (37 men, age range 30-84 years) indicated for cardiac catheterization. Right brachial pressure and central aortic pressure were simultaneously recorded using a dual-sensor pressure catheter, at steady state and 3 minutes after administration of a sublingual nitroglycerin. Noninvasive left arm SBP and diastolic blood pressure (DBP) were also simultaneously measured using an oscillometric blood pressure monitor that was designed to record pulse volume phlethysmography (PVP) immediately after the measurement of noninvasive blood pressures. Central SBP was estimated by the recently proposed comprehensive analysis of the PVP waveform calibrated by the noninvasive SBP and DBP, and also by identification of the late systolic shoulder (SBP2) of the invasive brachial pressure waveform. The reproducibility of the invasive central SBP by the noninvasive and invasive estimation methods was examined using the concordance correlation coefficient.
RESULTS: Overall, the invasive central aortic SBP ranged 85.6~175.5 with a mean of 123.6 ± 20.5 mmHg. The concordance correlation coefficient for the noninvasively estimated central SBP was 0.93 (95% CI 0.91~0.95), which was significantly better than that for the noninvasive SBP (0.87, 0.83~0.90) and was not significantly different from that for the invasive brachial SBP2 (0.96, 0.93~0.97).
CONCLUSION: The accuracy of the new osillometric method for estimating central SBP is close to the invasive brachial SBP2.
- © 2011 by American Heart Association, Inc.