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Response of the right ventricle to progressive pressure loading in pigs

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Summary

The purpose of this study was to determine the speed and duration of progressive pressure loading of the right ventricle to systemic pressure levels, which allows right ventricular adaptation without myocardial impairment at rest.

In 8 pigs with an average weight of 22 kg progressive right ventricular pressure loading of different speeds and durations was induced with a newly developed constrictor. Pressures in the right atrium, right ventricle, and pulmonary artery as well as angiocardiographic volume parameters of the right ventricle were determined weekly over a period of 4 to 7 weeks. A fast progressive right ventricular pressure increase of 3.4 mm Hg/day during 3 weeks was associated with a 20–30% reduction of ejection fraction and a 100% increase of the end-systolic volume. Increase of end-diastolic pressure was 3 to 5 fold. A slow progressive pressure increase of 1.5 to 2.2 mm Hg/day to 100 mm Hg within 4 to 5 weeks was associated with an increase of the end-diastolic pressure to a level observed in systemic ventricles, while change of ejection fraction and end-systolic volume was minimal. The faster the increase of right ventricular pressure the flatter was the peak systolic pressure/end-systolic volume relationship.

It is concluded that in contrast to sudden and fast progressive increase of afterload slow progressive increase of afterload to systemic levels does not impair right ventricular myocardial function.

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Author notes

  1. P. E. Lange

    Present address: Department of Pediatric Cardiology and Bioengineering, Schwanenweg 20, D-2300, Kiel, (F.R.G.)

Authors and Affiliations

  1. Department of Pediatric Cardiology and Bioengineering, Schwanenweg 20, D-2300, Kiel, (F.R.G.)

    J. H. Nürnberg, D. G. W. Onnasch & P. H. Heintzen

  2. Department of Cardiovasc. Surgery, University of Kiel, Schwanenweg 20, D-2300, Kiel, (F.R.G.)

    H. H. Sievers & A. Bernhard

Authors
  1. P. E. Lange
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  2. J. H. Nürnberg
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  3. H. H. Sievers
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  4. D. G. W. Onnasch
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  5. A. Bernhard
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  6. P. H. Heintzen
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Additional information

This study was supported by: Deutsche Forschungsgemeinschaft-grant HE 769/6-2

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Lange, P.E., Nürnberg, J.H., Sievers, H.H. et al. Response of the right ventricle to progressive pressure loading in pigs. Basic Res Cardiol 80, 436–444 (1985). https://doi.org/10.1007/BF01908188

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  • DOI: https://doi.org/10.1007/BF01908188

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