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Right ventricular hypertrophy causes impairment of left ventricular diastolic function in the rat

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Abstract

Right ventricular (RV) pressure overload causes right ventricular hypertrophy in several types of pulmonary and congenital heart diseases. The associated cardiac dysfunction has generally been attributed to alterations in RV function. However, due to global neurohormonal adaptations and mechanical ventricular interaction left ventricular (LV) function could be affected as well.Therefore,LV function, RV function and their interaction were studied in rats with monocrotaline (MCT)-induced RV hypertrophy and control rats. MCT (30 mg/kg) was used to induce pulmonary hypertension, which resulted, after 28 days, in marked RV hypertrophy (RV-weight: control 220 ± 15,MCT 437 ± 34mg,p < 0.05). In Langendorff-perfused hearts with balloons inserted in both the LV and the RV, the diastolic pressure-volume relations showed increased stiffness, and relaxation was prolonged in the LV and RV in the MCT group compared to controls. In the MCT group, developed pressures were increased only in the RV. An increase of LV volume increased RV diastolic pressure to a similar extent in both groups. However, an increase in RV volume did not affect LV diastolic pressure in controls, but significantly increased LV diastolic pressure in the MCT group. LV and RV developed pressure-volume relations were not affected. Calculated circumferential end-diastolic wall stresses (σ) were larger in the MCT group (LV-σ: 0.55 ± 0.02, RV-σ: 1.94 ± 0.30 kN/m2, both p< 0.05 to control) compared to controls (LV-σ: 0.34 ± 0.06,RV-σ: 1.23 ± 0.46 kN/m2). In the MCT group, collagen content was increased in the LV, septum and RV compared to controls. In conclusion, structural changes of the RV and LV result in depressed LV diastolic function during RV hypertrophy.

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Authors and Affiliations

  1. Laboratory for Physiology , Institute for Cardiovascular Research VU University Medical Center Amsterdam, Amsterdam, The Netherlands

    R. R. Lamberts PhD, R. J. Vaessen, N. Westerhof & G. J. M. Stienen

  2. Dept. of Anesthesiology, Laboratory for Physiology, Institute for Cardiovascular Research (ICaR-VU) VU University Medical Center Amsterdam, 1081 BT, Amsterdam, The Netherlands

    R. R. Lamberts PhD

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  1. R. R. Lamberts PhD
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  2. R. J. Vaessen
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  3. N. Westerhof
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  4. G. J. M. Stienen
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Correspondence to R. R. Lamberts PhD.

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Lamberts, R.R., Vaessen, R.J., Westerhof, N. et al. Right ventricular hypertrophy causes impairment of left ventricular diastolic function in the rat. Basic Res Cardiol 102, 19–27 (2007). https://doi.org/10.1007/s00395-006-0620-5

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  • DOI: https://doi.org/10.1007/s00395-006-0620-5

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