Do you mean atrial fibrillation? If so it is very treatable. May put him on a blood thinner to avoid a clot, shock the heart back into rythym or implant a pacemaker.
Does he have sleep apnea? It can cause a fib or make it worse. If so he needs a cpap.
Watch for incident delerium which can occur after just a few days in the hospital.
Patient exhibits dementia or Alzheimers like symptoms but return to normal once home.
He responded well to the first treatment but had elevated heart rate today. A cardiologist is working on it. I think dad is just alarmed at having a heart problem for the first time, which is natural. Thanks for the information on the incident delerium. I didn’t know about that.