Related Experiment Videos
Directional coronary atherectomy versus coronary angioplasty in vessels larger than 3 mm in diameter
B Y Seyithanoglu1, A R Zaki Masud, O Ergene
1Dokuz Eylül University Medical Faculty Hospital, Izmir, Turkey.
Insights
Directional coronary atherectomy (DCA) offers greater initial vessel opening than percutaneous transluminal coronary angioplasty (PTCA) in large coronary vessels, leading to lower restenosis rates. However, DCA is associated with a higher complication rate.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Medical Device Technology
Background:
- Directional coronary atherectomy (DCA) was proposed for larger coronary vessels (>3mm) due to its potential for greater minimal luminal diameter (MLD) compared to percutaneous transluminal coronary angioplasty (PTCA).
- This theoretical advantage suggested improved success rates and reduced restenosis.
- The study aimed to empirically compare DCA and PTCA in this specific patient subgroup.
Purpose of the Study:
- To compare the efficacy and safety of directional coronary atherectomy (DCA) versus percutaneous transluminal coronary angioplasty (PTCA).
- To evaluate outcomes in patients with coronary vessels larger than 3 mm in diameter.
- To assess differences in initial gain, residual stenosis, procedural success, complications, and restenosis rates.
Main Methods:
- A comparative study involving 150 consecutive patients undergoing DCA and 150 patients undergoing PTCA for vessels > 3 mm.
- Patients with ostial lesions, restenosis, vessels < 3 mm, or multiple significant lesions were excluded.
- Quantitative angiographic analysis was used to measure initial gain and residual stenosis; clinical follow-up assessed restenosis and complications.
Main Results:
- DCA achieved a significantly greater initial net gain (2.36 mm vs. 1.78 mm) and lower residual stenosis (11% vs. 33%) compared to PTCA.
- Procedural success rates were similar (91.5% for DCA vs. 84% for PTCA).
- Major in-hospital complications were higher with DCA (12% vs. 6%), including a higher incidence of acute occlusion requiring re-do procedures (6% vs. 1%).
Conclusions:
- In large coronary vessels (>3mm), DCA results in superior initial anatomical results and a lower 6-month restenosis rate compared to PTCA.
- Despite improved anatomical outcomes, DCA is associated with a higher complication rate, particularly acute occlusions.
- The choice between DCA and PTCA in large vessels requires careful consideration of the trade-off between improved initial results and increased procedural risk.
Abstract:
It has been proposed that directional coronary atherectomy (DCA) should be an intervention of choice in larger vessels as one can achieve a greater minimal luminal diameter with DCA than with percutaneous transluminal coronary angioplasty (PTCA). This in turn should translate into a higher success rate and may even reduce the restenosis rate. The aim of this study was to compare DCA versus PTCA in vessels > 3 mm in diameter. One hundred fifty consecutive patients who met the inclusion criteria and had DCA were compared to 150 similarly selected PTCA patients. PTCA patients were selected from the era immediately preceding the advent of DCA so that selections bias could be excluded. All patients with ostial lesions, restenosis, vessels < 3 mm in diameter, and vessels with more than two significant lesions were excluded. Distal segments and circumflex cases were excluded as they formed a small subsegment. Both groups were similar in terms of demographic, clinical and angiographic variables. Quantitative analysis showed that the initial net gain was significantly greater in the DCA group than in the PTCA group (2.36 +/- 0.8 mm vs. 1.78 +/- 0.7 mm; p < 0.05). Residual stenosis was 11% with DCA compared to 33% with PTCA (p < 0.05). Despite these improved anatomical results the procedural success rates were similar (91.5% vs 84%). Major in hospital complications (death, acute occlusion, MI, emergency CABG, re-do) were higher in the DCA group than in the PTCA group (12% vs 6%). Clinical follow-up on 276 patients (150 DCA vs 126 PTCA) showed a 6 month clinical restenosis rate of 18% vs 28%, respectively. The incidence of re-do in 24 hours for acute occlusion was 6% for DCA and 1% for PTCA. In large-sized vessels DCA results in a lower restenosis rate. However, despite a lower incidence of residual stenosis, the complication rate tends to be higher with DCA (p < 0.05).