He developed muscle twitching all over his body.; His vision started fading in and out, double vision; anxiety; depression; depersonalization; low blood pressure; cognitive issues; severe heart issue; atrial fibrillation; fainted/This was like his body shut down/Hot, sweaty, just fell to the floor; This spontaneous case was reported by a consumer and describes the occurrence of ATRIAL FIBRILLATION (atrial fibrillation) and SYNCOPE (fainted/This was like his body shut down/Hot, sweaty, just fell to the floor) in a 33-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 013F21A) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 19-Nov-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 19-Nov-2021, the patient experienced ATRIAL FIBRILLATION (atrial fibrillation) (seriousness criterion medically significant) and SYNCOPE (fainted/This was like his body shut down/Hot, sweaty, just fell to the floor) (seriousness criterion medically significant). In December 2021, the patient experienced CARDIAC DISCOMFORT (severe heart issue). In 2022, the patient experienced MUSCLE TWITCHING (He developed muscle twitching all over his body.), DIPLOPIA (His vision started fading in and out, double vision), ANXIETY (anxiety), DEPRESSION (depression), DEPERSONALISATION/DEREALISATION DISORDER (depersonalization), HYPOTENSION (low blood pressure) and COGNITIVE DISORDER (cognitive issues). At the time of the report, ATRIAL FIBRILLATION (atrial fibrillation), MUSCLE TWITCHING (He developed muscle twitching all over his body.), DIPLOPIA (His vision started fading in and out, double vision), ANXIETY (anxiety), DEPRESSION (depression), DEPERSONALISATION/DEREALISATION DISORDER (depersonalization), HYPOTENSION (low blood pressure), CARDIAC DISCOMFORT (severe heart issue) and COGNITIVE DISORDER (cognitive issues) had not resolved and SYNCOPE (fainted/This was like his body shut down/Hot, sweaty, just fell to the floor) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood pressure measurement: blood pressure was 200/something and It used to be 120/80, but now it's constantly 80/50. On an unknown date, Fibrin D dimer: d-dimer was through the roof. On an unknown date, Heart rate: now lower at 40. On an unknown date, X-ray: showed up normal on tests.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medication was reported. The patient did not receive any other vaccines in the 4 weeks prior to COVID-19 vaccine. The patient had a reaction to it 3 minutes later. The patient was hot and sweaty and just fell to the floor. The patient has seen many doctors.The patient had no pre-existing medical conditions. The patient was taken to the emergency room. Blood pressure was 200/something, through the roof. The doctor's reported that the patient fainted as the patient was nervous about the shot, but that wasn't the case. The patient had shots before with the military. This was like body shut down, but it was not an anaphylactic reaction. There was no allergy. The patient had an arrhythmia. The patient went to home.  A month after that the patient's heart started skipping beats and had an extreme arrhythmia. Diagnosed with atrial fibrillation and having a severe heart issue in regards to the shot. The d-dimer was through the roof, but everything else showed up normal on tests, like x-rays. The patient got better for about 2 months. But after 2 months, heart went crazy again. The patient developed muscle twitching all over the body. Vision started fading in and out, double vision. Had extreme anxiety, depression, depersonalization and cognitive issues. At the end of March 2022, it's been the same thing every day. Also developed extremely low blood pressure. It used to be 120/80, but now it's constantly 80/50. Resting heart rate was now lower at 40. The patient lost career, house, everything because of this mandated vaccine that the patient had to get for work. No treatment medication was reported  Company Comment: This spontaneous case concerns a 33-year-old healthy male patient with no medical history reported, who experienced the unexpected and serious (medically significant) events of syncope and atrial fibrillation (AESI) along with several non-serious events within 3 minutes to approximately one month after a first dose of mRNA-1273 vaccine was administered. The patient states he had a reaction to vaccine 3 minutes after it was given. He was hot and sweaty and just fell to the floor. He was taken to the emergency room, his blood pressure was 200/something, through the roof. They said he fainted because he was nervous about the shot, but that wasn't the case. This was like his body shut down, but it was not an anaphylactic reaction. There was no allergy. He had an arrhythmia. They didn't diagnose him with anything there and sent him home. A month after that, he was cooking dinner and out of nowhere, his heart started skipping beats and he had an extreme arrhythmia. They said it was atrial fibrillation and having a severe heart issue regarding the shot. His d-dimer was through the roof, but everything else showed up normal on tests, like x-rays. He got better for about 2 months, but after 2 months, his heart went crazy again. He developed muscle twitching all over his body, his vision started fading in and out with double vision. He had extreme anxiety, depression, depersonalization and cognitive issues. He also developed extremely low blood pressure. It used to be 120/80, but now it's constantly 80/50. His resting heart rate is now lower at 40. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This spontaneous case concerns a 33-year-old healthy male patient with no medical history reported, who experienced the unexpected and serious (medically significant) events of syncope and atrial fibrillation (AESI) along with several non-serious events within 3 minutes to approximately one month after a first dose of mRNA-1273 vaccine was administered. The patient states he had a reaction to vaccine 3 minutes after it was given. He was hot and sweaty and just fell to the floor. He was taken to the emergency room, his blood pressure was 200/something, through the roof. They said he fainted because he was nervous about the shot, but that wasn't the case. This was like his body shut down, but it was not an anaphylactic reaction. There was no allergy. He had an arrhythmia. They didn't diagnose him with anything there and sent him home. A month after that, he was cooking dinner and out of nowhere, his heart started skipping beats and he had an extreme arrhythmia. They said it was atrial fibrillation and having a severe heart issue regarding the shot. His d-dimer was through the roof, but everything else showed up normal on tests, like x-rays. He got better for about 2 months, but after 2 months, his heart went crazy again. He developed muscle twitching all over his body, his vision started fading in and out with double vision. He had extreme anxiety, depression, depersonalization and cognitive issues. He also developed extremely low blood pressure. It used to be 120/80, but now it's constantly 80/50. His resting heart rate is now lower at 40. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.