Coronary stenting without predilatation in a broad spectrum of clinical and angiographic situations.
Bibliographic record
Abstract
BACKGROUND: Direct coronary stenting without balloon predilatation has the potential benefits of a reduced risk of extended dissections, reduced fluoroscopy exposure, reduced procedural time, and potential cost savings. With the availability of superior stents and delivery systems, we review our experience with direct stent deployments in a large selected patient cohort. METHODS: We prospectively studied 158 consecutive cases of attempted coronary stenting without balloon predilatation over a 1-year period. RESULTS: Indications for the procedure included unstable angina (71%), stable angina (24%) and acute myocardial infarction (5%). Target vessels were the anterior descending artery (56%), right coronary artery (30%), circumflex artery (8%), and vein grafts (6%). Pre-procedural TIMI flows were grade 3 (91.7%), grade 2 (5.8%), grade 1 (1.3%) and 0 (1.3%). Lesion types were graded A (27%), B (61%), and C (12%). Stent types included NIR Primo (80.4%), ACS Multi-Link RX Duet (10.1%), NIR (5.1%), and others (4.4%). Stents ranged from 3.0Eth 4.0 mm in diameter (median = 3 mm) and 8Eth 32 mm in length (median = 16 mm). Stents were successfully deployed in 155 cases (98.1%); 2 (1.3%) required predilatation and 1 (0.6%) deployed stent could not be expanded and was opened by rotablation. All except the rotablator case achieved final TIMI grade 3 flow, and 66% did not require further balloon dilatation. There were no deaths or cases of urgent bypass surgery. Case duration and radiation exposure in direct stenting (32.8 +/- 18.9 minutes and 6.7 +/- 6.2 minutes, respectively) compared favorably to those in a matched group of patients in conventional stenting (47 +/- 18 minutes and 11 +/- 7 minutes) and coronary angioplasty (40 +/- 12 minutes and 10 +/- 6 minutes) for single-lesion cases (p < 0.005). Creatine kinase elevation related to the procedure was observed in 5 patients. Subacute stent thrombosis occurred in 2 (1.3%) cases. CONCLUSION: Direct coronary stenting was successfully and safely accomplished in a variety of clinical situations in selected patients.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.000 |
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 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".