Final answer:
The immediate intervention following defibrillation for a patient in VFib is to perform high-quality chest compressions as part of CPR to maintain blood circulation, particularly to the brain.
Step-by-step explanation:
In the scenario where a 45-year-old man is experiencing severe distress, crushing chest discomfort, and has deteriorated into ventricular tachycardia (VTach) that has advanced to ventricular fibrillation (VFib) following coronary stents placement, CPR (cardiopulmonary resuscitation) should be performed immediately after defibrillation, which involves chest compressions and may also include delivering breaths if trained personnel are present. However, with the presence of VFib, priority is to provide high-quality chest compressions to maintain blood flow, particularly to the brain, to prevent irreversible damage or death. The proper technique involves applying pressure to the sternum between the lines at T4 and T9.