heart failure in hypertensive patient.; this is a spontaneous report received from a contactable reporter(s) (consumer or other non hcp) from the regulatory authority. regulatory number: it-minisal02-843200. a 84 year-old female patient received bnt162b2 (comirnaty), intramuscular, administered in arm left, administration date 17apr2021 (lot number: ex0893) as dose 2, single for covid-19 immunisation. relevant medical history included: "chronic renal insufficiency" (unknown if ongoing), notes: stage iii; "hypertension arterial" (unknown if ongoing). the patient's concomitant medications were not reported. vaccination history included: comirnaty (dose 1, lot er9470, time 14:46, left deltoid), administration date: 27mar2021, for covid-19 immunization. the following information was reported: cardiac failure (death, medically significant) with onset 18apr2021, outcome "fatal", described as "heart failure in hypertensive patient.". the patient date of death was 18apr2021. the reported cause of death was cardiac failure. autopsy result 15feb2021, death following adverse effect induced by comirnaty vaccine (pfizer) second dose given less than 24 hours earlier. no follow-up attempts are possible. no further information is expected.; reported cause(s) of death: cardiac failure