The answer lies in the bubbles: a patient with superior sinus venosus defect, persistent left superior vena cava, and absent innominate vein
Bibliographic record
Abstract
A 38-year-old woman with atypical chest pain and exertional dyspnoea was referred to our service for a diagnostic work-up. Transthoracic echocardiography showed an enlarged coronary sinus (CS) and enlarged right-sided heart chambers without obvious atrial septal defect (Panel A). After injection of agitated saline contrast into the left cubital vein, immediate appearance of bubble contrast was noted in the CS and the right atrium consistent with drainage of a persistent left superior vena cava into the CS (Panel B). This finding left the dilatation of the right-sided heart chamber unexplained. Additional injection of agitated saline into the right cubital vein was the critical diagnostic hint, when bubbles appeared simultaneously in both atria (Panel C). This finding is almost pathognomonic for a superior sinus venosus defect. The absence of bubble contrast in the left atrium after injection into the left cubital vein is consistent with the absence of an innominate vein, which was subsequently confirmed on cardiac magnetic resonance imaging (Panel D). This case demonstrates the utility of agitated saline contrast for clarification of the cardiac anatomy, especially in the presence of an otherwise unexplained dilatation of the right-sided heart chambers. It also underlines, that in the odd case of rare anatomic variants, injection into both cubital veins may be necessary for a comprehensive and complete diagnostic work-up. Panel A. Apical four-chamber view, showing dilated right-sided heart chambers and a dilated CS (arrow). Panel B. After injection of agitated saline contrast into the left cubital vein, the CS (arrow) and right-sided heart chambers are opacified; there are no bubbles in the left heart chambers. Panel C. After injection of agitated saline contrast into the right cubital vein, simultaneous opacification of right and left heart chambers is obvious. Panel D. Three-dimensional reconstruction of a cardiac magnetic resonance angiogram showing a right superior and a persistent left superior vena cava (arrows). An innominate vein is absent.
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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 | 0.001 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.010 | 0.004 |
| Insufficient payload (model declined to judge) | 0.004 | 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".