OP24.03: Recovery of cardiac function in recipient twins following laser for stage 4 TTTS
Bibliographic record
Abstract
To evaluate the timing and pattern of cardiac function changes in recipient twins following laser treatment in Stage 4 TTTS. Retrospective review of serial fetal ultrasound evaluation in 16 cases of (Quintero) Stage 4 TTTS treated with laser treatment (1999–2006). Fetal ultrasounds, including echocardiography, were done before and serially after laser treatment. Cardiac function evaluation included cardiothoracic index, pulmonary arterial flow, AV valve regurgitation, venous Doppler (RV and LV inflows, UV, DV, IHV, IVC), isovolumetric relaxation time, ventricular contractility (LV & RV shortening fraction) and wall thickness. We evaluated the pattern and timing of recovery of hydrops and cardiac function in recipient twins following laser treatment. Of 16 cases treated, three with dual fetal demise following laser treatment were excluded. Complete fetal echocardiographic follow-up was available in 10 and partial in three. Abnormalities in pulmonary artery blood flow normalized in all within 4 days. Ascites resolved in 12/13 within 2 weeks. Five with tricuspid and one with mitral value regurgitation had not resolved by delivery. Right ventricular systolic function normalized in utero in 8/10 cases with complete follow-up, in a mean of 26 days. In 9/10 cases, left ventricular dysfunction normalized in utero, in a mean of 17 days. Venous Dopplers normalized in 16–24 days. Ventricular hypertrophy was the last to improve, taking a mean of 33 days and did not completely resolve by delivery in any case. Regardless of severity, improvements in systolic cardiac function, resolution of hydrops and normalization of venous and umbilical arterial waveforms occur in most recipient twins with Stage 4 TTTS within days of laser therapy. Valvular regurgitation and ventricular hypertrophy are the slowest to improve and may not completely resolve before delivery.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".