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[Influence of prolonged inflation on coronary restenosis after balloon angioplasty]
L Martínez Elbal1, L Calvo Orbe, M Gómez Recio
1Servicio de Cardiología, Hospital de la Princesa, Madrid.
Insights
Longer balloon inflation times do not reduce restenosis rates after percutaneous coronary intervention (PCI). This randomized study found no significant difference in restenosis incidence between prolonged and standard balloon inflations during PCI procedures.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Conflicting data exists regarding the impact of prolonged balloon inflation times on restenosis rates following percutaneous transluminal coronary angioplasty (PTCA).
- Previous non-controlled studies have yielded inconsistent results, necessitating further investigation.
Purpose of the Study:
- To prospectively evaluate the effect of prolonged versus standard balloon inflation durations on the incidence of restenosis after PTCA.
- To resolve discrepancies in existing literature concerning inflation times and restenosis rates.
Main Methods:
- A randomized, prospective study involving 153 patients undergoing one-vessel PTCA.
- Patients were randomized to either prolonged inflation (mean 13.5 min) or standard inflation (mean 3.1 min) using autoperfusion or conventional catheters, respectively.
- Exclusion criteria included specific lesion characteristics and vessel diameters < 2.5 mm.
Main Results:
- Successful dilation was achieved in 95.0% of standard inflation cases and 80.5% of prolonged inflation cases (p=0.01).
- Restenosis rates were 31.9% in the standard inflation group and 40.7% in the prolonged inflation group (p=0.4), showing no statistically significant difference.
- No significant baseline differences were observed between the two groups regarding patient demographics, risk factors, or lesion characteristics.
Conclusions:
- Prolonged balloon inflation periods do not appear to reduce the rate of restenosis after balloon coronary angioplasty.
- The findings suggest that standard inflation times are sufficient and prolonged inflations do not offer additional benefit in preventing restenosis.
Background And Objectives:
Previous noncontrolled studies yield conflicting data about the influence of long inflation times on restenosis rate after PTCA. To clear these differences, we designed an open, prospective and randomized study to assess the effect of long versus standard balloon inflations in the incidence of restenosis.
Methods:
153 consecutive patients selected for one-vessel PTCA (62 LAD, 43 LCx, 48 RCA), were randomized to prolonged inflation (13.5 +/- 3.3 min) at 6 atmospheres using an autoperfusion catheter (72 patients) or to standard inflations (3.1 +/- 1.6 min) using conventional catheters (81 patients). Vessel diameter < 2.5 mm, lesions located at distal segments, complete occlusions, tortuous, long, bifurcated or thrombotic lesions were excluded.
Results:
No significant differences in age, gender, coronary risk factors, ejection fraction, incidence of unstable angina or previous myocardial infarction existed between the two groups. There were no differences either between the dilated vessel, type of lesion (A, B, C) or the segment (proximal, mid) attempted. Successful dilation was obtained in 77/81 (95.0%) cases with standard inflation and in 58/72 (80.5%) with prolonged inflations (p = 0.01), leading to a decrease in the percentage of stenosis from 79.1 +/- 10.6% to 20.2 +/- 15.8% and from 81.4% +/- 9.9% to 21.0 +/- 13.0%, respectively (p = NS). A follow-up coronary arteriogram was obtained in 72/77 patients (93.5%) with standard inflation (mean: 18 +/- 6 weeks) and in 54/58 patients (93.1%) with prolonged inflation (mean: 17 +/- 3 weeks). Restenosis (arterial diameter reduction > 50%) was present in 23/72 (31.9%) of the standard inflation and in 22/54 (40.7%) of the prolonged inflation group (p = 0.4).
Conclusions:
These results suggest that longer balloon inflation periods do not reduce the restenosis rate after balloon coronary angioplasty.