He was diagnosed with the atrial fibrillation; This is a spontaneous report from a contactable consumer or other non-HCP (patient himself) via Medical Information Team. An 80-year-old male patient received BNT162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number- EN6200) via an unspecified route of administration in left arm on 20Feb2021 16:21 as dose 2, single (at the age of 80-years-old) for COVID-19 immunization. Patient medical history included, coronary artery disease from an unknown date and unknown if ongoing, high blood pressure/blood pressure measurement from an unknown date and he was treated for high blood pressure and was still being treated for it. It seemed to be bringing his blood pressure down to normal, heart bypass surgery (vascular graft) had in 2013 he believed, heart attack (myocardial infarction) from an unknown date, he guessed he has a couple of family members who have had heart attacks. He stated that when he was four years old, clarified as probably middle school age, he had a reaction to a tetanus shot, he believed they used horse serum at the time. He had a reaction to that, he does not think they use that same vaccine anymore he guesses. He had a couple of family members who have had heart attacks, stroke (cerebrovascular accident) from an unknown date and unknown if ongoing, his brother and mother and his father had a stroke, cholesterol (blood cholesterol). He did not have any prior vaccinations within 4 weeks. The concomitant medications included amlodipine, strength 10 mg was taking the 10 mg tablet dose for years taken for high blood pressure. He mentioned his doctor cut him back to half of a tablet taken, he stated that he guessed for high blood pressure, initially, it was supposed to be. The dose was changed after the incident. He guessed the dose was changed around the time he was put on the Amiodarone, ongoing rosuvastatin calcium (CRESTOR) at a dose of 20 mg a day taken for cholesterol (blood cholesterol) for years, acetylsalicylic acid (BABY ASPIRIN) taken at a dose of 81 mg for an unspecified indication from an unspecified start date and ongoing. Historical vaccine included BNT162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number- EL9264) via an unspecified route of administration in left arm on 30Jun2021 16:30 as dose 1, single for COVID-19 immunization. He knows that it had been some time, but he was concerned with the booster possibly coming out and he had an issue on whether he should get it or not, because he did have a reaction to the second shot that was on 20Feb2021. The following day on 21Feb2021, he had to go to the emergency room twice. He clarified he had a rapid heartbeat on 21Feb2021 and he ended up with a diagnosis of atrial fibrillation. He clarified he was only seen in the emergency room and was not admitted into the hospital that day and was treated for the condition and had an ablation procedure for A. Fib. He confirmd he was on Amlodipine prior to having the rapid heartbeat, diagnosis of A-fib. The patient said, he was wondering if how many cases have been reported with a connection between the vaccine and A. Fib, rapid heartbeat recovering. He had to follow up with his cardiologist and physio-somebody who does electro cardio shock treatment to get his heart back in rhythm. He later clarified that he had a regular cardiologist and an electrophysiologist. He had an ablation procedure to take care of the A-fib. It was a cardiac ablation. The patient provided the name for his general practitioner which is his main doctor. On 19Aug2021, the patient experienced cardiac ablation. He had a computerised tomogram (CT scan) before the ablation procedure, and it showed an enlarged left atrium. He had the ablation procedure on same day. He has a rather lengthy report from when he was released from the hospital. Stated he can provide a copy of this if needed. The patient mentioned that he was on Amiodarone. Since after the ablation, he was no longer on the Amiodarone as of 19Aug2021, when he had the procedure. He was on Xarelto. He clarified his general practitioner put him on Xarelto on 23Feb2021, after the event, to prevent stroke. The patient was told there was no evidence as of the state of any connection between that. He knows some people are reporting like an A-fib sometime after the actual vaccination and is there somewhere of how many reports have been about A-fib following injection. He confirmed he went to the ER for the rapid heartbeat on 21Feb2021, which was when he was diagnosed with the A-fib. He clarified he was only seen in the emergency room and was not admitted into the hospital. He had been treated and was still recovering from the ablation procedure. It was going to take a couple of months to get back to a normal heart rate. His heart rate has been improving. He mentions he is not a medical person. He had a CT scan before the ablation procedure and it showed an enlarged left atrium.  He has a rather lengthy report from when he was released from the hospital. States he can provide a copy of this if needed. Caller was advised that it would be documented in this report that he has that information to provide and advised him that Pfizer may contact him if in need of this information. He had the ablation procedure 19Aug2021. The adverse events resulted in Emergency Room twice and a visit to the physician office.  Therapeutic measures were taken as a result of he was diagnosed with the atrial fibrillation, rapid heartbeat. The outcome of the events atrial fibrillation and rapid heartbeat were recovering.