heart issues/left bundle branch block in his heart/heart functioning at 25%:; shortness of breath; he used to weight 235 pounds; now his weight fluctuates from 209-210-215 pounds; caller could fall asleep and not wake up; pneumonia; heart issues/left bundle branch block in his heart/heart functioning at 25%:; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 66-year-old male patient received BNT162b2 (BNT162B2), on 17Apr2022 as dose 2, single (Lot number: ER8733), in left arm for covid-19 immunisation. The patient's relevant medical history included: "Blood pressure high" (unspecified if ongoing). Concomitant medication(s) included: AMLODIPINE taken for hypertension, start date: 2006. Vaccination history included: BNT162b2 (Dose: 1, Lot Number: ER6208, NDC and Expiry Date: Unknown, Administered in the caller's left shoulder), administration date: 15Mar2021, when the patient was 66-year-old, for COVID-19 Immunization, reaction(s): "didn't feel good".  The following information was reported: BUNDLE BRANCH BLOCK LEFT (medically significant) with onset 10Oct2021, outcome "unknown", CARDIAC DYSFUNCTION (medically significant), outcome "unknown" and all described as "heart issues/left bundle branch block in his heart/heart functioning at 25%:"; PNEUMONIA (medically significant) with onset 17Apr2022, outcome "unknown"; DYSPNOEA (medically significant), outcome "unknown", described as "shortness of breath"; WEIGHT DECREASED (non-serious), outcome "unknown", described as "he used to weight 235 pounds; now his weight fluctuates from 209-210-215 pounds"; CIRCADIAN RHYTHM SLEEP DISORDER (non-serious), outcome "unknown", described as "caller could fall asleep and not wake up". The events "heart issues/left bundle branch block in his heart/heart functioning at 25%", "shortness of breath" and "pneumonia" required physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: Cardiac stress test: (unspecified date) Unknown results; Catheterisation cardiac: (11Feb2022) found no blockages; Echocardiogram: (unspecified date) Unknown results; Magnetic resonance imaging: (unspecified date) Unknown results; Weight: (unspecified date) 235 lbs; (unspecified date) 209 lbs; (unspecified date) 210 lbs; (unspecified date) 215 lbs. Therapeutic measures were taken as a result of cardiac dysfunction, bundle branch block left.  Clinical course: The reporter stated that he was calling about the first two shots of the Pfizer Covid Vaccines. States that he took the first shot and didn't feel good after, but a couple of days later he was okay. After the second shot he really did not feel good, and neither did his son. Reporter states that his wife took the caller and the caller's son to the Emergency Room. The reporter states that for himself they said he had a left bundle branch block in his heart and his heart was functioning at 25%. The caller's son had an elevated heart rate. The reporter states that the kept him and his son overnight for observation and then released them the next day. This report concerns the reporter himself, reporter states that when he went back to his doctor in they wanted to know why his heart did that. They ran a MRI, Echo, and stress test. Caller states that they told him his heart should not have been like that. The reporter states then they did a heart cath and found no blockages. They told the caller it had to have just been an episode. Caller states that he went back to work and ended up back at the Emergency Room. At that time he had pneumonia because his heart was not working properly. He couldn't work for a while after that, and still cannot do a lot because he gets out of breath. Caller states that he has talked to others who had the same symptoms, like shortness of breath and everything. No identifying information provided by the caller on these others he says he has spoke to. Caller states that he was calling to see if Pfizer has any protocol in place for this? Reporter mentions that he is retired from the and now just works doing little stuff, driving trucks. Left bundle branch block, heart functioning at 25%: Reporter states that he went to the Emergency Room for this on 10Oct2021 and was kept in observation overnight until 11Oct2021. Heart catheter; no blockages: Reporter states that he had this procedure done on 11Feb2022. Pneumonia: Reporter states that he was diagnosed with this in the Emergency Room on 17Apr2022. States he had pneumonia because his heart wasn't working properly. Reporter states that his question pertains to him hoping that Pfizer has some kind of protocol in place or some treatment recommendations for situations like this. States that he is seeing his doctor, they put the caller on an unspecified heart medication to strengthen his heart. Caller says that they put him on a life vest to electrocute him to bring him back if needed, states he could not wear it, it was uncomfortable. No further information provided related to this life vest. Reporter states that one doctor told him he could not drive; but the caller's doctor in said that the caller could drive. The doctor's are concerned that the caller could fall asleep and not wake up; caller states that has him concerned also. He has slowed down at work a lot.