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Effect of increased preload on the synthesized aortic blood pressure waveform. J Appl Physiol 109: 484–490, 2010. First published June 17, 2010; doi:10.1152/japplphysiol.00196.2010.—In the present study, we examined the influence of preload augmentation via passive leg elevation (PLE) on synthesized aortic blood pressure, aortic augmentation index (AIx), and aortic capacitance (a reflection of aortic reservoir function). Central and peripheral hemodynamics were measured via tonometry with a generalized transfer function in 14 young, healthy men (age
24 yr). Aortic blood flow was calculated from the left ventricular outflow tract (LVOT) velocity-time integral (VTI) using standard two-dimensional echocardiographic-Doppler techniques. Measures were made in the supine position at rest (Pre), during PLE, and during recovery (Post). There was a significant increase in LVOT-VTI, synthesized aortic systolic blood pressure (BP) and AIx from Pre to PLE, with values returning to baseline Post (P  0.05). There was a reduction in aortic capacitance from Pre to PLE, with values returning to baseline Post (P  0.05). There was no change in heart rate, systemic arterial compliance, aortic elastance, aortic wave travel timing, or vascular resistance (P  0.05). Change in AIx from Pre to PLE was associated with change in LVOT-VTI (r
0.66, P  0.05) and inversely associated with change in aortic capacitance (r
0.73, P  0.05). These data suggest that in a setting of isolated augmented preload with minimal changes in other potential confounders, the morphology of the synthesized aortic BP waveform and AIx may be related to changes in aortic reservoir function.

Item Type:	Refereed Article
Keywords:	augmentation index; blood pressure; aortic reservoir function; arterial compliance
Research Division:	Biomedical and Clinical Sciences
Research Group:	Cardiovascular medicine and haematology
Research Field:	Cardiology (incl. cardiovascular diseases)
Objective Division:	Health
Objective Group:	Clinical health
Objective Field:	Clinical health not elsewhere classified
UTAS Author:	Sharman, JE (Professor James Sharman)
ID Code:	66315
Year Published:	2010
Web of Science® Times Cited:	15
Deposited By:	Menzies Institute for Medical Research
Deposited On:	2011-01-12
Last Modified:	2011-05-02
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