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Intraoperative mapping-guided argon laser ablation of malignant ventricular tachycardia
Abstract:
Intraoperative mapping-guided laser ablation of arrhythmogenic myocardium was performed in 5 patients with refractory sustained ventricular tachycardia (VT). Using a 15-W argon laser coupled to a 300-mu optical fiber, a bloodless laser ventriculotomy was successfully performed in 4 patients with VT. Visually- and mapping-guided endocardial ablation of 7 VT morphologic patterns was performed. Five of the 7 sites of VT origin were unresectable using standard resection techniques. Postoperatively, spontaneous and inducible VT was suppressed in all patients (without antiarrhythmic drugs in 4 patients and with a previously ineffective drug 1 patient). Mean pulmonary capillary wedge pressure, cardiac index and left ventricular ejection fraction were unchanged (p greater than 0.2) from preoperative values. Mean maximal creatinine kinase-MB isoenzyme concentration was 139 +/- 75 IU. All patients were New York Heart Association functional class II at discharge. During follow-up, no spontaneous arrhythmia has recurred in any patient. Thus, intraoperative argon laser ablation is effective for VT ablation alone or in conjunction with standard surgical resection techniques.
Insights
Argon laser ablation effectively treated refractory ventricular tachycardia (VT) in 5 patients. This minimally invasive technique suppressed VT post-surgery, offering a new option for complex cases.
Area of Science:
- Cardiology
- Cardiac Surgery
- Medical Technology
Background:
- Refractory sustained ventricular tachycardia (VT) poses a significant treatment challenge.
- Standard surgical resection techniques are not always feasible for all VT origins.
Purpose of the Study:
- To evaluate the efficacy and safety of intraoperative mapping-guided laser ablation for refractory VT.
- To assess the feasibility of using argon laser for bloodless ventriculotomy in VT ablation.
Main Methods:
- Intraoperative mapping-guided endocardial laser ablation using a 15-W argon laser and a 300-µm optical fiber was performed in 5 patients.
- Ablation targeted 7 distinct VT morphologic patterns, including sites unresectable by standard methods.
- Hemodynamic parameters and cardiac biomarkers were monitored postoperatively.
Main Results:
- Successful bloodless laser ventriculotomy was achieved in 4 out of 5 patients.
- All patients experienced suppression of spontaneous and inducible VT post-ablation.
- No significant changes in pulmonary capillary wedge pressure, cardiac index, or ejection fraction were observed.
- Mean maximal creatinine kinase-MB isoenzyme concentration was 139 +/- 75 IU.
- All patients were discharged in New York Heart Association functional class II.
Conclusions:
- Intraoperative argon laser ablation is an effective treatment for refractory VT, either alone or combined with standard surgery.
- The technique provides a viable option for VT ablation, particularly for unresectable sites.
- Long-term follow-up showed no recurrence of spontaneous arrhythmia in any patient.