unconscious; no heart rate/heart was not beating; all of the sudden she stopped breathing and her heart stopped beating; COVID 19 test positive; act funny, kind of quiet and not talking which was unusual for her; pressure was 60 over 4; This is a spontaneous report from a contactable consumer (patient husband). A 78-year-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Lot Number: EN5318), via an unspecified route of administration on 28Jan2021 16:00 at single dose at left arm for covid-19 immunization. Medical history included kidney ablation (ablation on the kidney cancer 5 years ago), kidney cancer, blood pressure, neuropathy, pain, had a urinary tract infection 19Dec2020 and they saw the cancer came back, radiologist read the CAT Scan and said the size of the tumor 1.5 to 2.4. Concomitant medications included acebutolol for blood pressure taking for years, diclofenac for neuropathy using for 10 years, oxycodone for pain taking 19 years; all ongoing, and oxycodone hydrochloride (OXYCONTIN) for pain. Patient didn't receive any other vaccines within 4 weeks prior to the COVID vaccine. Family Medical History was none. The caller stated that he was not sure if the Pfizer COVID-19 vaccine could have given patient (his wife) COVID-19 or not. He also stated that when they received their vaccines the facility was very crowded as was the hospital when the wife was getting her blood work done so he was not sure when or where she contracted COVID-19. On 29Jan2021, patient was very busy running several errands including going to the hospital for bloodwork and a nuclear medicine injection as part of a work up for kidney ablation that the patient was supposed to have completed, patient was in the process of getting ready to have an ablation on her kidney and had the nuclear scan for her kidneys and then went to get a COVID test. After they got home, patient sat down at the computer and she started to act funny, kind of quiet and not talking which was unusual for her. So at about 1700PM the husband went in to ask her what kind of music she would like and he found her unconscious in the chair. He took her blood pressure and it was 60 over 4; with no heart rate; she was just barely breathing, he could tell by the way her mouth moved. He tried to breath for her, all of the sudden she stopped breathing and her heart stopped beating. He called (phone number provided) and they rushed her to the hospital, and the paramedics verified her heart was not beating and they started to do resuscitation. Then they finally pulled her out of the chair and put her on the floor and she started to breath. When they took her to the ambulance she was still not quite coherent; she didn't know what was happening. She was taken to the hospital emergency room and stayed there for 12 hours and they monitored her with an EKG and only saw one spike for 6 seconds. They discharged her on 30Jan2021 afternoon and she has been totally normal 100 percent since then. Since she had been home she had been doing well and has had no other events. Added patient had never had a heart problem before. Caller stated that he was not sure if this event was related to her receiving the vaccine or not. Now they had to stay in quarantine 10 days until 08Feb2021 since the COVID test given at the hospital on 29Jan2021 night when she went in was positive. Patient was scheduled to received the second shot 18Feb2021. Outcome of events unconscious, no heart rate, pressure was 60 over 4 was recovered on 29Jan2021, events started to act funny and stopped breathing was recovered on 30Jan2021, outcome of other events was unknown. The adverse events resulted in emergency room/department or urgent care, patient was taken to the ER and monitored for 12 hours but no admission. No history of all previous immunization with the Pfizer vaccine considered as suspect. No additional vaccines administered on same date of the Pfizer suspect.