a defibrillator system capable of defibrillation and patient monitoring . when used as a patient monitor , the defibrillator system includes a defibrillator and removable monitoring electrodes . the monitoring electrodes communicate with a monitoring adapter and the defibrillator . a method of detecting the presence of the monitoring electrodes by the defibrillator is also included . a removable monitoring adapter . the removable monitoring adapter having a test impedance . defibrillators include semi - automatic defibrillators and automatic defibrillators .