Role of catecholamine oxidation in sudden cardiac death
Bibliographic record
Abstract
Although sudden cardiac death is a leading cause of mortality, the mechanisms for its pathogenesis are poorly understood. Because overactivation of sympathetic nervous system is invariably seen in subjects with high risk for sudden cardiac death, elevated levels of circulating catecholamine levels are considered to result in lethal ventricular arrhythmias and subsequent sudden cardiac death. Such arrhythmogenic effects of catecholamines are generally believed to occur by their actions on α-adrenoceptors in coronary arteries for inducing coronary spasm and subsequent myocardial ischemia as well as on β-adrenoceptors in cardiomyocytes for increasing the concentration of cyclic AMP excessively and producing defects in intracellular Ca2+ handling. Experimental evidence from our laboratory has revealed that excessive amounts of circulating catecholamines are oxidized to aminochromes, which are highly reactive quinine compounds. The oxidation products of catecholamines have been demonstrated to produce subcellular alterations, intracellular Ca2+ overload, coronary spasm, myocardial cell damage, depletion of high energy stores, and ventricular arrhythmias. In addition, oxyradicals, which are known to generate oxidative stress and produce cardiotoxic effects, including arrhythmias, are formed during the oxidation of catecholamines. Accordingly, it is proposed that oxidation of catecholamines and the generation of oxidative stress under stressful conditions may play a critical role in the genesis of ventricular arrhythmias that may result in sudden cardiac death.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".