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- W2090091243 abstract "Introduction: Deaths secondary to low-energy impacts to the precordium in young individuals (commotio cordis) have been reported with increasing frequency. In a swine model, baseball impacts induce ventricular fibrillation when directed at the center of the left ventricle during the vulnerable portion of repolarization just prior to the T-wave peak. It has been hypothesized that activation of stretch-sensitive channels could be crucial for this electrophysiological phenomenon. In this study, a nonselective stretch-activated cation channel was pharmacologically blocked prior to chest blows to determine whether this channel represents a possible pathway by which commotio cordis events occur. Methods: In a randomized and blinded experiment, 12 swine (mean 17.1 ± 2.5 kg) received either 2-g streptomycin intramuscularly (mean serum concentration 115 ± 18 μM) or sterile water prior to chest impact. Each animal received six precordial impacts with a baseball propelled at 40 mph. Results: There was no significant difference in the frequency of induced VF in the animals administered streptomycin (10 of 19 impacts: 53%) compared to those control animals receiving only sterile water (10 of 31: 32%) (P = 0.15). However, the magnitude of ST segment elevation was less in the streptomycin-treated animals (19 ± 19 mV) versus controls (61 ± 46 mV) (P = 0.015). Conclusion: Streptomycin did not alter the frequency of ventricular fibrillation in our commotio cordis model, indicating that the stretch-activated channel is not implicated in the genesis of chest blow-induced cardiac arrest. However, streptomycin did reduce ST elevation following impact suggesting that the stretch-activated channel may play a role in ST segment elevation following chest wall blows." @default.
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- W2090091243 date "2005-04-01" @default.
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- W2090091243 title "Role of Streptomycin-Sensitive Stretch-Activated Channel in Chest Wall Impact Induced Sudden Death (Commotio Cordis)" @default.
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- W2090091243 doi "https://doi.org/10.1046/j.1540-8167.2005.40664.x" @default.
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