two months after receiving second dose vaccine, whenever caller was laying in bed caller was getting an irregular heart beat every 3 to 4 days; This is a spontaneous report received from a contactable reporter (Consumer or other non- healthcare professional). The reporter is the patient reporting for himself.  A 81 year-old male patient received bnt162b2 (BNT162B2), administered in deltoid left, administration date 10Feb2021 (Lot number: EM9810, Expiration Date: Jun2021) at the age of 81 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Arrhythmic heart" (ongoing), notes: Verbatim: Arrhythmic heart; "slight blood pressure" (ongoing), notes: Verbatim: slight blood pressure; "use to be over 5'9 but shrunk" (unspecified if ongoing), notes: shrinking occurred prior to any dose of the Pfizer Covid Vaccine. There were no concomitant medications. Vaccination history included: Bnt162b2 (First dose, lot: unknown, caller states lot not listed on vaccination card, NDC: unknown, Expiration date: unknown, Route of administration: left shoulder), administration date: 20Jan2021, when the patient was 80 years old, for COVID-19 immunization. The following information was reported: HEART RATE IRREGULAR (non-serious) with onset 2021, outcome "unknown", described as "two months after receiving second dose vaccine, whenever caller was laying in bed caller was getting an irregular heart beat every 3 to 4 days". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: First dose: 20Jan2021, the vaccine card says Withheld, RN, the name of the girl that gave the reporter the first dose Pfizer Covid Vaccine. Second dose: 10Feb2021, NDC: unknown, Route of administration: left shoulder, Time the Vaccination Was Given: First dose: morning, second dose: morning, third dose: in morning. Anatomical Location of Administration of Pfizer vaccine considered as suspect: Left shoulder. Patient history: Arrhythmic heart (From: Unspecified To: Ongoing). Additional Information for Other Conditions: The reporter states he has an arrhythmic heart that goes boom boom boom but makes up for the beat the heart misses. Patient history: slight blood pressure (From: Unspecified To: Ongoing). Additional Information for Other Conditions: The reporter states had a little bit slight blood pressure but think its phony. he can sit so long, and blood pressure goes way down, he is up and moving blood pressure can be up around 170. He was diagnosed with years ago. Investigation Assessment was None. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s) were none. AE(s) following prior vaccinations were none. Family Medical History Relevant to AE(s): Nothing that the reporter ever had. No, family history, both reporter's parents lived into their 90's. Relevant Tests were none. Other Products were None. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available): Vaccine Name: Pfizer Covid Vaccine, Lot Number: unknown, caller states lot not listed on vaccination card. Expiry Date: Unknown, Anatomical Location: Left shoulder, No. of Previous Doses: First dose, Date: 20Jan2021, Age at Immunization if date not available: 80 years. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available): Vaccine Name: Pfizer Covid Vaccine, Lot Number: FF2590, Expiry Date: 31Dec2021, NDC: unknown, Anatomical Location: Left shoulder, No. of Previous Doses: Third dose, Date: 19Oct2021, Age at Immunization if date not available: 81 years. The reporter states the vaccine card says 3mg. Height: The reporter use to be over 5'9 but shrunk. Agent asks the reporter if shrinking occurred prior to any dose of the Pfizer Covid Vaccine or after receiving any dose of the Pfizer Covid Vaccine and the reporter replies no, the shrinking occurred over a long period of time when he was younger, he was 5'9 and its old age shrinking the reporter thinks. The reporter states he is a vet and just a couple weeks ago had a full exam at the withheld and everything was fine. Additional Vaccines Administered on Same Date of the Pfizer Suspect If applicable, list all vaccines administered on same date with the Pfizer vaccine considered as suspect were none. The reporter reported that two months after receiving second dose Pfizer Covid Vaccine, whenever he was lying in bed he was getting an irregular heart beat every 3 to 4 days. The reporter states he can't tell exact dates but the irregular heart beat occurred months after receiving second dose Pfizer Covid Vaccine. In the beginning, talking about stuff with younger people getting myocarditis. Nobody explained what it was and the he never paid any attention. When the irregular heart beat happened to the him, the reporter did not realize what was going on until the day talking about it again and the reporter looked on the PC and that is why the reporter is calling Pfizer. The reporter states he is not an HCP, he is a retired old man. The reporter has a situation where the reporter's daughter refuses to get vaccinated and if the reporter's daughter finds out this happened to him, she will huff. If something else comes up the reporter will contact Pfizer. The reporter states the irregular heartbeat occurred a couple months ago, clarifies as 2 or 3 months ago. two months after receiving second dose vaccine, whenever the reporter was laying in bed he was getting an irregular heart beat every 3 to 4 days: This occurred 2 or 3 months ago, reporter not sure of exact date. The reporter didn't pay attention because didn't realize what the irregular heartbeat was. The reporter states the irregular heartbeat just occurred three times and lasted for 5 or 10 seconds only when he was laying in bed. The reporter can't remember if he woke up and was lying there or if it happened or whatever. Happened three different nights. AE(s) did not require a visit to Emergency Room or Physician Office. The reporter never said anything because did not know what it was. Thought something funny was going on. The problem was never really explained of what was coming up being effected with the Pfizer Covid Vaccine, no identification. Reporter seriousness for two months after receiving second dose vaccine, whenever caller was laying in bed caller was getting an irregular heart beat every 3 to 4 days was Unspecified.  No follow-up attempts are possible. No further information is expected.