Takotsubo is an acute myocardial ischaemic syndrome
Bibliographic record
Abstract
Takotsubo is an acute ischaemic syndrome: a case illustration. A 68-year-old woman with a history of treated hypertension and dyslipidaemia experienced acute chest pain while attending a funeral. Following the involvement of the emergency services, an initial 12-lead electrocardiogram revealed ST-segment elevation in the precordial leads (V2–V6) and T-wave inversion (upper row, right). The peak high-sensitivity troponin T concentration was 692 ng/L. Echocardiography revealed left ventricular systolic dysfunction (ejection fraction 46%) due to anterolateral hypokinesis coupled with hyperdynamic contractility in the basal and inferolateral regions. Urgent, invasive coronary angiography revealed smooth, patent coronary arteries (middle row). Adjunctive coronary function tests (upper row, right) involving bolus saline thermodilution (Coroventis, Uppsala, Sweden) in the left anterior descending coronary artery disclosed a reduced coronary flow reserve (2.0, abnormal ≤ 2.5), an increased index of microvascular resistance (29 mmHg.s, abnormal ≥ 25 mmHg.s), and an increase in myocardial resistance reserve (3.5, abnormal > 3.0). Left ventriculography revealed typical, apical ballooning (middle row, right). Cardiovascular magnetic resonance imaging (MRI) at 1.5 T (Avanto-fit, Siemens Healthcare), performed 13 days from the index presentation, revealed improved left ventricular systolic function (ejection fraction 64%), hyperintense myocardial oedema with an apical distribution [left ventricular four-chamber view, native transverse relaxation time (T2) 65 ms (apex), 44 ms remote zone, basal; reference range 42–52 ms; bottom row, left], and no evidence of scar tissue or fibrosis (four-chamber view, no myocardial late gadolinium enhancement; bottom row, middle). At clinical follow-up 6 months later, the patient had persisting anginal symptoms on exertion, consistent with Canadian Cardiovascular Society angina class 2 and New York Heart Association functional class II. Intravenous adenosine (140 μg/kg/min) stress perfusion cardiovascular MRI revealed a reduction in subendocardial myocardial blood flow during hyperaemia (1.88 mL/min/g; normal > 1.96 mL/min/g) and epicardial hyperaemia, consistent with persistent subendocardial coronary microvascular dysfunction. Left ventricular systolic function and myocardial oedema imaging had normalized.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| 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 | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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".