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Coronary perfusion catheter: its effectiveness in an experimental model of acute coronary occlusion
A E Moreyra1, A Macris, J B Kostis
1Department of Medicine, UMDNJ-Robert Wood Johnson Medical School, New Brunswick 08903-0019.
Insights
A coronary perfusion catheter effectively restored regional myocardial blood flow during acute coronary occlusion in a canine model. This intervention improved blood flow to critical heart muscle layers, demonstrating its potential for treating ischemic events.
Area of Science:
- Cardiovascular Research
- Medical Devices
- Animal Models
Background:
- Acute coronary occlusion leads to reduced myocardial blood flow (MBF) and impaired regional function.
- Effective reperfusion strategies are crucial for mitigating ischemic damage.
- Assessing novel devices like perfusion catheters is vital for advancing cardiac care.
Purpose of the Study:
- To evaluate the efficacy of a coronary perfusion catheter in restoring regional myocardial blood flow (RMBF) and function during acute coronary occlusion.
- To compare hemodynamic and functional parameters with and without the perfusion catheter in place.
Main Methods:
- An animal model using anesthetized dogs with induced acute coronary occlusion of the circumflex coronary artery (CX).
- Measurements included systemic hemodynamics, regional myocardial blood flow (subepicardial and subendocardial), and regional systolic function.
- Data collected during initial occlusion (No. 1) and after placement of a perfusion catheter (occlusion No. 2).
Main Results:
- Occlusion No. 1 significantly reduced subepicardial and subendocardial RMBF (p < 0.01).
- Following perfusion catheter placement (occlusion No. 2), RMBF was maintained at levels not significantly different from baseline.
- Subepicardial RMBF during occlusion No. 2 was significantly higher than during occlusion No. 1 (p < 0.05).
Conclusions:
- The coronary perfusion catheter effectively restored regional myocardial blood flow during acute coronary occlusion in a canine model.
- The device maintained blood flow to both subepicardial and subendocardial regions, crucial for myocardial viability.
- These findings support the potential clinical utility of perfusion catheters in managing acute ischemic events.
Abstract:
The effectiveness of a coronary perfusion catheter was studied in an animal model of acute coronary occlusion. Systemic hemodynamic variables, regional myocardial blood flow (RMBF) in the subepicardium and subendocardium, and regional systolic function (systolic segmental shortening) of the area perfused by the circumflex coronary artery (CX) were measured in eight anesthetized dogs. After baseline measurements, the CX coronary artery was occluded with a silk snare and measurements were repeated after 5 minutes of ischemia (occlusion No. 1). The snare was released and 1 hour later the snare occlusion was repeated after placement of a perfusion catheter in the CX coronary artery. After 5 minutes, measurements were repeated (occlusion No. 2). To determine the long-term effectiveness of the catheter, hemodynamic variables and regional function measurements were then obtained every 15 minutes for a total of 60 minutes. During occlusion No. 1, RMBF decreased from 1.30 +/- 0.20 to 0.41 +/- 0.13 ml.min-1.gm-1 (p less than 0.01), and subendocardial RMBF decreased from 1.44 +/- .24 to 0.34 +/- 0.15 ml.min-1.gm-1 (p less than 0.01). After insertion of the perfusion catheter (occlusion No. 2), subepicardial RMBF was maintained at 0.97 +/- 0.16 and subendocardial RMBF was maintained at 0.78 +/- 0.13 ml.min-1.gm-1; during occlusion No. 2 subepicardial RMBF was greater (p less than 0.05) than occlusion No. 1 and was not different from baseline.(ABSTRACT TRUNCATED AT 250 WORDS)