he gets very winded just making his bed in the morning; dizziness; The report showed that the patient was in AFib; The report showed that the patient was in AFib, he has a history of AFib in Sep/Oct2020; Patient reports that his memory was very fuzzy today; low blood pressure, he checked BP today and it was 79/56; short of breath; COVID-19 booster; This is a spontaneous report received from contactable reporter (Consumer). The reporter is the patient. Other Case identifier: NVSC2021US271141_NS. A 73-year-old male patient received bnt162b2 (BNT162B2), administration date 17Dec2021 (Batch/Lot number: unknown) at the age of 73 years as dose number unknown (booster), single for covid-19 immunisation. Relevant medical history included: "he has a history of AFib", start date: 2020 (unspecified if ongoing), notes: he has a history of AFib in Sep/Oct2020; "pacemaker" (unspecified if ongoing), notes: HCP requested he send a report from his pacemaker. The patient took concomitant medications. Vaccination history included: Covid-19 vaccine (Primary immunization complete (1st dose) but manufacturer unknown), for COVID-19 Immunization; Covid-19 vaccine (Primary immunization complete (2nd dose) but manufacturer unknown), for COVID-19 Immunization. The following information was reported: IMMUNISATION (medically significant) with onset 17Dec2021, outcome "unknown", described as "COVID-19 booster"; ATRIAL FIBRILLATION (medically significant), outcome "unknown", described as "The report showed that the patient was in AFib"; DISEASE RECURRENCE (medically significant), outcome "unknown", described as "The report showed that the patient was in AFib, he has a history of AFib in Sep/Oct2020"; DYSPNOEA (non-serious) with onset 20Dec2021, outcome "not recovered", described as "short of breath"; FLATULENCE (non-serious), outcome "unknown", described as "he gets very winded just making his bed in the morning"; DIZZINESS (non-serious), outcome "unknown", described as "dizziness"; FEELING ABNORMAL (non-serious) with onset 21Dec2021, outcome "unknown", described as "Patient reports that his memory was very fuzzy today"; HYPOTENSION (non-serious) with onset 21Dec2021, outcome "unknown", described as "low blood pressure, he checked BP today and it was 79/56". The patient underwent the following laboratory tests and procedures: blood pressure (21Dec2021) 79/56, notes: Low; AFIB (unspecified date) 21%. Therapeutic measures were taken as a result of dyspnoea. Additional information: Patient reports he had his COVID-19 booster last Friday and didn't feel so hot for a few days after. He has been more short of breath since Monday night, he called cardiologist who increased water pills for this week. He has not noticed an improvement yet. He stated that he gets very winded just making his bed in the morning. Patient also experienced dizziness. Patient reported that his memory was very fuzzy today and also low blood pressure, he checked BP today and it was 79/56 [units unspecified]. Patient mentioned that he talked to his HCP about his low blood pressure, dizziness, and shortness of breath today. HCP requested he send a report from his pacemaker. The report showed that the patient was in AFib, he has a history of AFib in Sep/Oct2020. His report showed he was in AFib 21% of the time.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.