Journal article
Hyperpolarized cardiac arrest with a potassium-channel opener, aprikalim
The Journal of thoracic and cardiovascular surgery, v 110(4), pp 1083-1095
Oct 1995
PMID: 7475137
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Cardioplegic solutions that arrest the heart at or near the resting membrane potential may provide better myocardial protection than standard depolarizing hyperkalemic cardioplegia by reducing both metabolic demand and harmful transmembrane ion fluxes. This hypothesis was investigated in an isolated, blood-perfused, rabbit heart Langendorff model during 30 minutes of normothermic global ischemia. Hyperpolarized cardiac arrest induced by aprikalim, an opener of adenosine triphosphate-dependent potassium channels, was compared with hyperkalemic depolarized arrest and with unprotected global ischemia. Left ventricular pressure was recorded over a wide range of balloon volumes before ischemia and 30 minutes after reperfusion. End-diastolic pressure versus balloon volume data were fitted to a two-coefficient exponential relationship. Changes in the diastolic compliance of the left ventricle were assessed by comparison of preischemic and postischemic coefficients within each cardioplegia group. Postischemic recovery of developed pressure was used to assess changes in left ventricular systolic function. The tissue water content of each heart was also determined. Myocardial protection with aprikalim resulted in better postischemic recovery of developed pressure (90% ± 9%) than either protection with hyperkalemic cardioplegia (73% ± 11%) or no protection (62% ± 9%). Myocardial tissue water content in hearts protected with hyperkalemic cardioplegia (77.4% ± 1.4%) was less than the tissue water content of either unprotected hearts (79.4% ± 1.2%) or hearts protected with aprikalim (78.7% ± 0.9%). Despite these differences, neither hyperkalemic cardioplegia (
p = 0.15) nor aprikalim cardioplegia (
p = 0.30) was associated with a significant postischemic decrease in ventricular compliance. By contrast, unprotected global ischemia was associated with a significant decrease in ventricular compliance (
p < 0.001).
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Details
- Title
- Hyperpolarized cardiac arrest with a potassium-channel opener, aprikalim
- Creators
- Steven L. Maskal - Virginia Commonwealth University Medical CenterNeri M. CohenPeng-Wie Hsia - Virginia Commonwealth University Medical CenterAndrew S. Wechsler - Virginia Commonwealth University Medical CenterRalph J. Damiano - Virginia Commonwealth University Medical Center
- Publication Details
- The Journal of thoracic and cardiovascular surgery, v 110(4), pp 1083-1095
- Publisher
- Mosby, Inc
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Medicine; [Retired Faculty]
- Web of Science ID
- WOS:A1995TB91400025
- Scopus ID
- 2-s2.0-0028792462
- Other Identifier
- 991020705366104721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Cardiac & Cardiovascular Systems
- Respiratory System
- Surgery