Patients with refractory ventricular extrasystoles or tachycardia not eligible for catheter ablation will receive single fraction stereotactic body radiation therapy (cardiac radiosurgery) with 25 Gy. Investigators initiated this study to demonstrate that in at least 70% of the patients the planned cardiac radiosurgery may be performed without any interruption or treatment related interventional events within the first 30 days after treatment.
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Acute toxicity analysed by Adverse Event (AE)- and Serious Adverse Event (SAE)-reports
Timeframe: 30 days after radiosurgery