I'm not a medical professional, but I can provide some general information. During a heart attack, the heart can experience a temporary cessation of effective blood pumping, which can lead to a condition called cardiac arrest. In such cases, if immediate medical intervention is provided, such as CPR or defibrillation, a person can be revived.
If your dad had a heart attack but is alive now, it’s possible that he experienced a loss of heart function temporarily. However, the specifics of his condition, including whether he was revived after a brief period of non-responsiveness, would depend on the details of his medical situation and what the doctors communicated to you. It’s best to consult with the healthcare professionals involved in his care for accurate information about his experiences.