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Distal coronary artery perfusion during percutaneous transluminal coronary angioplasty
Insights
Perfusion using a fluorocarbon emulsion (FL) during percutaneous coronary angioplasty (PTCA) reduced angina and ECG changes. This technique allows for longer balloon occlusion times, improving patient outcomes in coronary interventions.
Area of Science:
- Cardiology
- Interventional Cardiology
- Biomedical Engineering
Background:
- Percutaneous coronary angioplasty (PTCA) involves balloon angioplasty to open blocked coronary arteries.
- Coronary artery occlusion during PTCA can lead to myocardial ischemia, causing angina and ECG changes.
- Limited occlusion times during PTCA can restrict procedural effectiveness.
Purpose of the Study:
- To evaluate the feasibility and efficacy of distal coronary artery perfusion during PTCA.
- To compare the effects of lactated Ringer's solution (LR) versus a fluorocarbon emulsion (FL) as perfusates.
- To determine if distal perfusion can mitigate ischemia and allow for extended balloon occlusion times.
Main Methods:
- A randomized crossover study involving 34 patients undergoing PTCA.
- Exogenous substances, LR and Fluosol-DA 20% (FL), were perfused distally through the PTCA catheter at 60 ml/min.
- Two 90-second coronary artery occlusions were performed per patient, with perfusate type randomized.
Main Results:
- FL perfusion significantly delayed the onset of angina (41 vs 33 seconds) and shortened its duration (77 vs 92 seconds) compared to LR.
- FL perfusion led to a greater reduction in ST-segment elevation on ECG (0.15 vs 0.2 mV) compared to LR.
- Balloon occlusion time was significantly extended with FL perfusion (71 vs 59 seconds).
Conclusions:
- Distal coronary artery perfusion is feasible during PTCA.
- Fluorocarbon emulsion (FL) perfusion effectively reduces myocardial ischemia during balloon occlusion.
- This technique allows for prolonged occlusion times, potentially enhancing PTCA outcomes.
Abstract:
Perfusion of the coronary artery distal to an occluding angioplasty balloon was performed in 34 patients undergoing coronary angioplasty (PTCA). A randomized crossover study was employed using two exogenous substances as perfusates: lactated Ringer's solution (LR) and a fluorocarbon emulsion (FL), Fluosol-DA 20%. Both substances are electrolyte solutions, but the FL will dissolve more oxygen than the LR. During two attempted coronary artery occlusions of 90 seconds each, we perfused through the central lumen (guidewire channel) of the PTCA catheter at 60 ml/min. With FL perfusion the mean time to onset of angina after occlusion was delayed (41 +/- 21 vs 33 +/- 16 seconds, mean +/- SD; p less than 0.05), the mean duration of angina was shortened (77 +/- 58 vs 92 +/- 70 seconds, p less than 0.05), and the rise in the ST segment of the ECG was reduced (0.15 +/- 0.24 vs 0.2 +/- 0.23 mV, p less than 0.001) when compared to LR perfusion. Balloon occlusion time was able to be extended with FL perfusion (71 +/- 22 vs 59 +/- 22 seconds p less than 0.001). These results indicate that perfusion of the distal coronary artery is possible during PTCA and can reduce ischemia during a prolonged balloon occlusion time.