Assessment of a device for trans-telephonic control of defibrillation

The safety and efficacy of a device allowing the trans-telephonic control of defibrillation have been assessed in 32 attempted defibrillations performed in 29 patients. The initial rhythm was atrial fibrillation in 27; ventricular tachycardia in 4; and ventricular flutter in 1. Satisfactory voice and ECG transmission were established in all cases. The mean time taken by the patient unit to dial and activate the base station was 20.3 seconds. The mean defibrillator charge time was 5.5 seconds to 50 joules and 9.3 seconds to 360 joules. A total of 84 synchronised and 5 unsynchronised shocks were delivered satisfactorily. Lay persons were trained to use the patient unit, and were able to operate the device at home. This device has the potential for rapid defibrillation of patients who develop ventricular fibrillation outside hospital.