Abstract:
:To evaluate the effect of Ca2+ on recovery of heart function after hypothermic preservation, isolated working rat hearts were perfused continuously in different [Ca2+] (0.35-2.0 mM) at 37 degrees C for 30 min, during cooling to 5 degrees C, and then at 5 degrees C for 1, 6 or 18 h. After rewarming to 37 degrees C, contractile functions were assessed in working hearts perfused with Krebs-Henseleit (K-H) solution containing 2.0 mM free Ca2+. In normal K-H solution (2.0 mM Ca2+), cardiac function recovered completely after perfusion at 5 degrees C for 1 h (measured by the maximal rate of pressure development, +dP/dtmax, and heart rate x left ventricular systolic pressure, HR x LVSP). After 6 h at 5 degrees C, significant (P < 0.05) loss in function began to appear. Further, 18 h at 5 degrees C resulted in significant decreases in LVSP, +dP/dtmax, and coronary flow (CF) and a significant increase in left ventricular diastolic pressure. The deterioration of heart function consequent to hypothermic preservation could be prevented by reducing the Ca2+ in perfusion medium prior to and during cooling and rewarming from hypothermia. The optimal Ca2+ concentration was 0.5 mM. At lower Ca2+ (0.35 mM), reductions in HR, LVSP. +dP/dtmax, and CF after rewarming were evident. Our results indicate that by reducing cellular Ca2+ prior to cooling through perfusion of 0.5 mM Ca2+ K-H solution, significant benefits can be obtained both in prolonging the duration of cardiac preservation and in retaining functional integrity upon rewarming.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
Liu B,Lopaschuk GD,Wang LCdoi
10.1006/cryo.1994.1031subject
Has Abstractpub_date
1994-06-01 00:00:00pages
254-62issue
3eissn
0011-2240issn
1090-2392pii
S0011-2240(84)71031-5journal_volume
31pub_type
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