Right ventricular dynamics during left ventricular assistance in closed-chest dogs

Marc R. Moon, Luis J. Castro, Abelardo DeAnda, Yasuko Tomizawa, George T. Daughters, Neil B. Ingels, D. Craig Miller

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

To determine the effects of left ventricular assist device (LVAD) support on global right ventricular (RV) systolic mechanics, 8 closed-chest, conscious, sedated dogs were studied after placement of an LVAD (left ventricle to femoral artery bypass) and implantation of 27 tantalum markers into the left ventricular and RV walls for computation of biventricular volumes and geometry. Biplane cinefluoroscopic marker images and hemodynamic parameters were recorded during transient vena caval occlusion at various levels of LVAD support. Right ventricular contractility was assessed using end-systolic elastance and preload recruitable stroke work, and the myocardial (pump) efficiency of converting mechanical energy to external work (stroke work/total pressure-volume area) was calculated. With full LVAD support, RV end-diastolic volume increased from 60 ± 15 to 62 ± 17 mL (p <0.002), pulmonary artery input impedance decreased from 940 ± 636 to 587 ± 347 dyne · s/cm5 (p <0.007), and measurement of RV and left ventricular septal-free wall dimensions demonstrated a significant leftward septal shift (p <0.0005). Global RV end-systolic elastance and preload recruitable stroke work decreased from 2.4 ± 1.0 to 1.7 ± 0.7 mm Hg/mL (p <0.004) and 14.1 ± 3.3 to 12.1 ± 3.9 mm Hg (p <0.02), respectively; however, RV power output and myocardial efficiency did not change significantly (p > 0.74 and p > 0.33, respectively). Therefore, during LVAD support, global RV contractility is impaired with leftward septal shifting, but RV myocardiol efficiency and power output are maintained through a decrease in RV afterload and an increase in RV preload.

Original languageEnglish (US)
Pages (from-to)54-67
Number of pages14
JournalThe Annals of Thoracic Surgery
Volume56
Issue number1
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

Heart-Assist Devices
Thorax
Dogs
Stroke
Tantalum
Venae Cavae
Femoral Artery
Mechanics
Stroke Volume
Heart Ventricles
Hemodynamics
Pressure

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery

Cite this

Moon, M. R., Castro, L. J., DeAnda, A., Tomizawa, Y., Daughters, G. T., Ingels, N. B., & Miller, D. C. (1993). Right ventricular dynamics during left ventricular assistance in closed-chest dogs. The Annals of Thoracic Surgery, 56(1), 54-67. https://doi.org/10.1016/0003-4975(93)90402-4

Right ventricular dynamics during left ventricular assistance in closed-chest dogs. / Moon, Marc R.; Castro, Luis J.; DeAnda, Abelardo; Tomizawa, Yasuko; Daughters, George T.; Ingels, Neil B.; Miller, D. Craig.

In: The Annals of Thoracic Surgery, Vol. 56, No. 1, 1993, p. 54-67.

Research output: Contribution to journalArticle

Moon, MR, Castro, LJ, DeAnda, A, Tomizawa, Y, Daughters, GT, Ingels, NB & Miller, DC 1993, 'Right ventricular dynamics during left ventricular assistance in closed-chest dogs', The Annals of Thoracic Surgery, vol. 56, no. 1, pp. 54-67. https://doi.org/10.1016/0003-4975(93)90402-4
Moon, Marc R. ; Castro, Luis J. ; DeAnda, Abelardo ; Tomizawa, Yasuko ; Daughters, George T. ; Ingels, Neil B. ; Miller, D. Craig. / Right ventricular dynamics during left ventricular assistance in closed-chest dogs. In: The Annals of Thoracic Surgery. 1993 ; Vol. 56, No. 1. pp. 54-67.
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