normal EF are between 55-60, hers had went to 25-30; chest tightness; winded; fatigue; shortness of breath; This is a spontaneous report from a contactable consumer (patient). A 52-year-old female patient received the first dose of bnt162b2 (BNT162B2, Solution for injection, Lot Number: EP7534), via an unspecified route of administration, administered in Arm on 19Mar2021 (received at the age of 52-years-old) as DOSE 1, SINGLE for COVID-19 immunisation. The patient did not receive any vaccine within 4 weeks prior to receiving the Pfizer vaccine. Medical history included left bundle branch block from 2016 to an unspecified date, and vitamin D low. Concomitant medication(s) included vitamin d3 (VITAMIN D3) taken for vitamin d low, from 2013 (8 years ago) and ongoing; multivitamin as recommended by the doctor, from 20 years ago and ongoing. The patient experienced chest tightness, winded, fatigue, and shortness of breath on 22Mar2021 (3rd day after the vaccination). The patient had her first dose of the Pfizer BioNTech COVID-19 vaccine last 19Mar2021 and plans to have the second dose in 3 days. She mentioned that when she had her first dose, she experienced chest tightness, winded, fatigue, shortness of breath. The patient mentioned she had full cardiac work up done, which stated where normal EF are between 55-60, hers had went to 25-30. She also mentioned that she had a heart work up in 2016 because of left bundle branch block and had no problems until the first dose of the vaccine. She mentioned that the health system she works for is mandating the vaccine and wanted to know maximum amount of time to get the second one. She is concerned about getting the second dose because she mentioned that now she had accumulated the symptoms she mentioned and is on medications with big medical expenses. She mentioned that "you can't live without a heart". She wanted to know if there would be any side effect from the second dose of the Pfizer BioNTech COVID-19 vaccine because of her experience with the first dose. She mentioned that she read from the CDC that if she was experiencing the things that she was experiencing, they recommended not to have the second dose. The patient stated she is pretty much healthy. She only takes a vitamin d and a multivitamin. She had her first covid vaccine back on 19Mar2021 and she planned to have the second one in 3 days. She had chest tightness, winded, fatigue, shortness of breath, and couldn't catch her breath when vacuuming one room, or getting to the car. These started on the 3rd day after the vaccine (22Mar2021). She went to her primary care provider and everybody is all over the page with different symptoms and people. Her primary care provider wanted her to get a full cardiac work up. It took 9 weeks to get into the cardiologist. The cardiologist needed her to have an echo and where a normal EF is 55-60 hers had went to 25 to 30. Then she had the echo and by the time she went back to the cardiologist she needed to go straight in and get a heart cath. She has a heart cath, no blockages, and her LEVT looks great and all normal. At the time of report, the patient's chest tightness has decreased since she is on medication. As corrective treatment, she had an echocardiogram, heart Cath, entresto and metoprolol.  At the time of report, the patient's symptom winded has decreased with medication. Her fatigue also decreased. As corrective treatment, she only gotten the heart cath, echo, and continuously getting labs every two to three weeks following up with the cardiologist and a repeat echo in September and following up with the cardiologist in September. The adverse event did not require a visit to the emergency room, but required multiple visits to physician office. Outcome of the event normal EF are between 55-60, hers had went to 25-30 was unknown, while outcome of the other events was recovering.