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

Research output: Contribution to journalArticlepeer-review

214 Scopus citations

Abstract

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/dtmax), 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/dtmax-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.

Original languageEnglish (US)
Pages (from-to)H1416-H1422
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume274
Issue number4 43-4
DOIs
StatePublished - Apr 1998
Externally publishedYes

Keywords

  • Conductance volumetry
  • Hemodynamics
  • Mouse
  • Ventricular function

ASJC Scopus subject areas

  • Physiology

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