Key result
Acute exposure to hydroxyl radicals induced a rigor-like contracture in both atrial and ventricular myocardium, with atrial muscles showing a faster onset but a lesser degree of contractile dysfunction.
Why the study?
Does hydroxyl radical exposure cause different contractile dysfunction in atrial versus ventricular myocardium of dogs and rabbits?
Does hydroxyl radical exposure cause different contractile dysfunction in atrial versus ventricular myocardium of dogs and rabbits?
Answers are grounded in this paper and cite their sources.
Atrial myocardium exhibits a lesser degree of contractile dysfunction than ventricular myocardium following acute hydroxyl radical-induced injury in both dog and rabbit models.
UNLABELLED: Despite the widespread use of ventricular tissue in the investigation involving hydroxyl radical Aim: (OH*) injury, one of the most potent mediators in ischemia-reperfusion injury, little is known about the impact on atrial myocardium. In this study we thus compared the OH*-induced injury response between atrial and right ventricular muscles from both rabbits and dogs under identical experimental conditions. METHODS: Small, contracting ventricular and atrial rabbit and dog trabeculae were directly exposed to OH*, and contractile properties were examined and quantified. RESULTS: A brief OH* exposure led to transient rigor like contracture with marked elevation of diastolic tension and depression of developed force. Although the injury response showed similarities between atrial and ventricular myocardium, there were significant differences as well. In rabbit atrial muscles, the development of the contracture and its peak was much faster as compared to ventricular muscles. Also, at the peak of contracture, both rabbit and dog atrial muscles show a lesser degree of contractile dysfunction. CONCLUSION: These results indicate that both atrial and ventricular muscles develop a rigor-like contracture after acute OH*-induced injury, and atrial muscles showed a lesser degree of contractile dysfunction. Comparison of dog versus rabbit tissue shows that the response was similar in magnitude, but slower to develop in dog tissue.
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Nitisha Hiranandani (2010) studied Ischemia-reperfusion injury (hydroxyl radical-induced). Hydroxyl radical (OH) exposure vs. Baseline (pre-exposure) and ventricular vs. atrial tissue comparison was evaluated on Contractile properties including diastolic tension and developed force (p=<0.05). Acute exposure to hydroxyl radicals induced a rigor-like contracture in both atrial and ventricular myocardium, with atrial muscles showing a faster onset but a lesser degree of contractile dysfunction.
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