In vivo murine left ventricular pressure-volume relations by miniaturized conductance micromanometry

Dimitrios Georgakopoulos, Wayne A. Mitzner, Chen Huan Chen, Barry J. Byrne, Huntly D. Millar, Joshua M. Hare, David A. Kass*

*此作品的通信作者

研究成果: Article同行評審

225 引文 斯高帕斯(Scopus)

摘要

The mouse is the species of choice for creating genetically engineered models of human disease. To study detailed systolic and diastolic left ventricular (LV) chamber mechanics in mice in vivo, we developed a miniaturized conductance-manometer system. α-Chloralose-urethan-anesthetized animals were instrumented with a two-electrode pressure-volume catheter advanced via the LV apex to the aortic root. Custom electronics provided time-varying conductances related to cavity volume. Baseline hemodynamics were similar to values in conscious animals: 634 ± 14 beats/min, 112 ± 4 mmHg, 5.3 ± 0.8 mmHg, and 11,777 ± 732 mmHg/s for heart rate, end-systolic and end-diastolic pressures, and maximum first derivative of ventricular pressure with respect to time (dP/dt(max)), respectively. Catheter stroke volume during preload reduction by inferior vena caval occlusion correlated with that by ultrasound aortic flow probe (r2 = 0.98). This maneuver yielded end-systolic elastances of 79 ± 21 mmHg/μl, preload-recruitable stroke work of 82 ± 5.6 mmHg, and slope of dP/dt(max)-end-diastolic volume relation of 699 ± 100 mmHg·s-1·μl-1, and these relations varied predictably with acute inotropic interventions. The control normalized time-varying elastance curve was similar to human data, further supporting comparable chamber mechanics between species. This novel approach should greatly help assess cardiovascular function in the blood-perfused murine heart.

原文English
頁(從 - 到)H1416-H1422
期刊American Journal of Physiology - Heart and Circulatory Physiology
274
發行號4 43-4
DOIs
出版狀態Published - 4月 1998

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