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• W2106002523 abstract "Burn trauma initiates a pathophysiologic cascade, which includes cardiac dysfunction and intramyocyte calcium accumulation. This study examined the hypothesis that therapeutic interventions which limit intracellular cardiac Ca(2+) accumulation after burn trauma will improve cardiac function. Guinea pigs were anesthetized (methoxyflurane), burned over 43% of total body surface area, and fluid resuscitated (FR) for 24 h. Burn guinea pigs were randomly divided into three groups: Group 1, FR alone, Group 2, FR plus dantrolene (10 mg/kg body wt, IV, 30 min, 8 and 22 h postburn), a drug which inhibits the Ca(2+) release channel (ryanodine receptor) of the cardiac sarcoplasmic reticulum, and Group 3, FR plus diltiazem (0.20-0.22 mg/kg given IV as a slow infusion over 6 h postburn), a drug which specifically blocks Ca(2+) slow channels; sham burn guinea pigs were given vehicle (Group 4), dantrolene (Group 5), or diltiazem (Group 6) as described above (respective controls). Cardiac dysfunction was impaired in fluid-treated burns (Group 1) compared to sham burns (Group 4) as indicated by reduced developed left ventricular pressure (LVP) (86 +/- 2 vs 52 +/- 3 mm Hg, P < 0.05), rate of LVP rise, (+dP/dt max, 1379 +/- 64 vs 909 +/- 44 mm Hg/s, P < 0.05), and LVP fall (-dP/dt max, 1184 +/- 31 vs 881 +/- 40 mm Hg/s, P < 0.05), and time to peak pressure (110 +/- 2 vs 102 +/- 2 ms, P < 0.05). In addition, [Ca(2+)](i) rose in cardiomyocytes harvested from fluid-treated burns (Group 1, 307 +/- 29 nM) compared to vehicle-treated controls (Group 4, 152 +/- 6 nM, P < 0.05). Neither calcium antagonist altered ventricular function or [Ca(2+)](i) in sham burns (Groups 5 and 6). In contrast, antagonists given after burn injury reduced cardiomyocyte [Ca(2+)](i) (Group 2, dantrolene-treated burns: 196 +/- 8 nM, and Group 3, diltiazem treated burns: 216 +/- 8 nM) and improved cardiac performance compared to that measured in burns given FR alone. Our data suggest that calcium antagonists given after burn trauma restored intracellular Ca(2+) homeostasis, decreased cardiac cell injury, and improved cardiac contractile function." @default.
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• W2106002523 date "1999-11-01" @default.
• W2106002523 modified "2023-09-26" @default.
• W2106002523 title "Calcium Antagonists Improve Cardiac Mechanical Performance after Thermal Trauma" @default.
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• W2106002523 doi "https://doi.org/10.1006/jsre.1999.5726" @default.
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