The Ominous Triad of Severe Takotsubo Cardiomyopathy
Bibliographic record
Abstract
QT prolongation is present in 26-52% of cases of Takotsubo cardiomyopathy (TCM). It has been postulated to result from reduced cardiac repolarization reserve and reflects the transient myocardial insult observed in TCM. Bradycardia-induced QT interval prolongation is amplified by the occurrence of TCM, a combination that potentially carries a significant risk for torsade de pointes (TdP). We present a unique case of an 80-year-old female with TCM-related cardiac arrest. The patient had acquired long QT syndrome in which TCM myocardial insult led to the precipitation of a third-degree atrioventricular (AV) block and subsequent bradycardia-induced TdP. Due to the lack of robust literature, there is no clear guideline in the management of third-degree AV block in the setting of TCM. In our case, because of recurrent ventricular tachycardia (VT) and ventricular fibrillation (VF) arrest, we opted for temporary pacing at a high ventricular rate, followed by a biventricular implantable cardioverter-defibrillator (BiV/ICD). Follow-up 3 months later revealed improvement of left ventricular (LV) dysfunction and resolution of QT prolongation. However, the noticed AV conduction defects persisted. In the available literature, we identified five reported cases that bear similarity with our patient's presentation. The identified cases were middle-aged to elderly females with no significant cardiac history, who exhibited a similar triad of TCM associated with high-grade AV block, acquired long QT syndrome, and a rapid progression of bradycardia-induced TdP, resulting in a near cardiac arrest within the first 24 - 48 h of admission. It is crucial to monitor corrected QT (QTc), correct electrolyte abnormalities, and minimize QT-prolonging medications in patients with TCM. The recognition of AV conduction defects in patients with TCM is critical, especially if it is associated with significant QT prolongation. Such situations are underrecognized, and are potentially fatal, necessitating close monitoring and timely intervention.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 source (direct Gemma or distilled Codex), 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".