Half-Normal Saline vs Normal Saline for Cavotricuspid Isthmus-Dependent Atrial Flutter Ablation
Bibliographic record
Abstract
BackgroundCavotricuspid isthmus (CTI) ablation requires permanent bidirectional block to prevent recurrence of typical atrial flutter (AFL). Catheter irrigation with half-normal saline (HNS) produces larger and deeper lesions in experimental models when compared to normal saline (NS). This study was performed to compare the clinical efficacy and safety of HNS versus NS irrigation for typical AFL ablation.MethodsSixty-patients undergoing catheter ablation of typical AFL were randomized 1:1 to NS or HNS irrigation. Endpoints included time to CTI block, acute reconnection, incidence of steam pops and AFL recurrence during follow-up.ResultsBaseline characteristics were comparable between both arms. The mean age of the patients was 68.5±8.2 years, 20% were female and 32% had atrial fibrillation prior to being enrolled. Bidirectional CTI block was obtained in all patients with no difference in time to CTI block between groups (6.4±4.4 minutes versus 7.6±4.5 minutes respectively, p=0.15). There was a trend to less acute reconnection in the HNS group compared to NS (13.3% versus 26.6%, p=0.46). Steam pops occurred in 4 patients using HNS versus none in the NS group, but no major complications were observed. During the follow-up, rate of AFL recurrence was similar between groups (6.7% with HNS vs 10% with NS, p=0.5). There was no difference in time to recurrence (7.6±6.9 vs. 4.9±4.5 months, p=0.6).ConclusionIn this small pilot RCT, there was no significant difference between HNS and NS for CTI ablation, however, HNS may increase the incidence of steam pops.
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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 | 0.000 |
| 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".