right heart failure; -60% power (competitive cycling); sometimes dyspnea; pressure on the chest; pulse increased +10-15 beats; this is a spontaneous report received from a contactable reporter(s) (consumer or other non hcp) from the regulatory authority-web. regulatory number: at-basgages-2021-064402 . a 36 year-old male patient received bnt162b2 (comirnaty), administration date 17nov2021 (lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. the patient's relevant medical history and concomitant medications were not reported. vaccination history included: covid-19 vaccine (dose 1, manufacturer unknown), for covid-19 immunization; covid-19 vaccine (dose 2, manufacturer unknown), for covid-19 immunization. the following information was reported: right ventricular failure (medically significant) with onset 18nov2021, outcome "not recovered", described as "right heart failure"; exercise tolerance decreased (non-serious) with onset 18nov2021, outcome "not recovered", described as "-60% power (competitive cycling)"; dyspnoea (non-serious) with onset 18nov2021, outcome "not recovered", described as "sometimes dyspnea"; chest discomfort (non-serious) with onset 18nov2021, outcome "not recovered", described as "pressure on the chest"; heart rate increased (non-serious) with onset 18nov2021, outcome "not recovered", described as "pulse increased +10-15 beats". the patient underwent the following laboratory tests and procedures: heart rate: 10-15 beats increased. no follow-up attempts are possible; information about lot/batch number cannot be obtained. no further information is expected