Effects of intravascular cryotherapy on vessel wall repair in a balloon-injured rabbit iliac artery model
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Bibliographic record
Abstract
OBJECTIVE: Although the application of cold energy, cryotherapy, has been shown to cause selective damage to cellular components with preservation of matrix structure resulting in less fibrosis in a variety of tissues, the effects of intravascular cryotherapy on vessel wall repair after balloon angioplasty are unknown. We sought to characterize the effects of cryotherapy application on vessel wall repair after balloon angioplasty and study the relationship between collagen accumulation in the vessel wall and late lumen loss as assessed by serial intravascular ultrasound. METHODS: The immediate, early (72 h) and late (10 weeks) effects of three intravascular cryotherapy application time periods (60, 120 and 240 s) after iliac artery balloon angioplasty ('cryotherapy') were compared with balloon angioplasty alone ('control') in 59 rabbits. Arterial lumen area was measured by intravascular ultrasound immediately after the procedure, at 72 h and at 10 weeks. Collagen content was calculated separately for intima and media/adventitia layers and correlated with late lumen loss. RESULTS: Cryotherapy produced average vessel wall temperature of -26 degrees C (range, -20 to -45 degrees C) and resulted in significantly larger lumen cross-sectional area (CSA) immediately after application (5.74+/-1.18 vs. 4.14+/-0.75 mm(2), P=0.008) but was not different than control arteries at 10 weeks. At 72 h, there was extensive cell loss in the medial and adventitial layers accompanied by increased macrophage infiltration in cryotherapy treated arteries compared to control. At 10 weeks, intimal hyperplasia was increased 2-fold in cryotherapy treated arteries. Collagen content was increased 2-fold in the medial/adventitial layers, and nearly 3-fold in the intima of cryotherapy treated arteries. Collagen content in arterial intima (P=0.01) as well as media/adventitia (P=0.005) positively correlated with late lumen loss. Foci of chondro- and osseous metaplasia and calcification were evident at the medial-adventitial junction in cryotherapy treated arteries at 10 weeks. CONCLUSION: Intravascular cryotherapy induced early arterial wall cell loss and late intimal hyperplasia, vascular fibrosis and chondro- and osseous metaplastic changes with no late beneficial effects on lumen area compared to balloon angioplasty alone. Collagen accumulation in all three layers of the vessel wall contributes to the development of late inward remodeling after balloon angioplasty.
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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 | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it