E.M.T.’s apparatus, informally

The answer to the crossword question “E.M.T.’s apparatus, informally” is DEFIB. An E.M.T. (Emergency Medical Technician) is a medical professional who responds to emergency situations and provides critical care to patients. One of the essential tools in their arsenal is a defibrillator or “defib” informally. This machine delivers an electric shock to the heart and helps restore normal heart rhythm in patients experiencing cardiac arrest. In emergency medical situations, defibrillators can make a lifesaving difference in the outcome of a patient’s treatment.