Buy Defibrillators or Automated External Defibrillator from PrimedeQ. When a heart patient develops very rapid irregular contractions of the heart muscle fibers resulting in a lack of synchronisation between heartbeat and pulse, usually called ventricular tachycardia, defibrillator is commonly used by emergency caregivers to stabilize the patient. Poular brands available are Philips, BPL, Mindray, GE, Nihon Kohden.