realized it must be from the COVID19 vaccine.; Heart problems; chest pain for 6 minutes; Shortness of breath; This spontaneous case was reported by a consumer and describes the occurrence of CARDIAC DISORDER (Heart problems), CHEST PAIN (chest pain for 6 minutes), DYSPNOEA (Shortness of breath) and VACCINATION COMPLICATION (realized it must be from the COVID19 vaccine.) in a 70-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 044A21A and 016M20A) for COVID-19 vaccination.     The patient's past medical history included Heartbeats increased (faster heartbeat, but that it only happens every one or two months and lasts at its longest one minute).   On 16-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 16-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 16-Mar-2021, the patient experienced CARDIAC DISORDER (Heart problems), CHEST PAIN (chest pain for 6 minutes) and DYSPNOEA (Shortness of breath). On an unknown date, the patient experienced VACCINATION COMPLICATION (realized it must be from the COVID19 vaccine.). At the time of the report, CARDIAC DISORDER (Heart problems), DYSPNOEA (Shortness of breath) and VACCINATION COMPLICATION (realized it must be from the COVID19 vaccine.) outcome was unknown and CHEST PAIN (chest pain for 6 minutes) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Heart rate: fast (High) very fast.         No concomitant medication details provided.   No treatment medication details provided.  Patient reported that since the patient got the second dose of the vaccine, she has had "very fast heartbeat" and "heart problems". For months, this happened everyday and lasted almost 40 minutes at times.   Patient stated she went to the ER and the doctor thought she had a heart attack because she had chest pain for 6 minutes, shortness of breath and a fast heartbeat. This lasted several months, until September 2021. Patient stated events seems like it happens once or twice a week, it has slowed down. Patient attributes this to acupuncture. Patient stated that at first, she didn't know why this was happening and then realized it must be from the COVID19 vaccine.  Company comment include  This case concerns a 70-year-old, female patient with medical history of heartbeats increased, who experienced the unexpected non serious events of cardiac disorder, heart rate increased, dyspnoea and chest pain. The events occurred following the second dose of Moderna COVID-19 Vaccine. Ever since the patient got the second dose of the vaccine, she has had "very fast heartbeat" and "heart problems". For months, this happened everyday and lasted almost 40 minutes at times, as reported. The patient stated she went to the ER and the doctor thought she had a heart attack because she had chest pain for 6 minutes, shortness of breath and a fast heartbeat. This lasted several months. Patient stated events no happen once or twice a week, as it has slowed down. Patient attributes this to acupuncture. The rechallenge was not applicable. The reporter assessed the events as related to the product. The medical history of increased heartbeat remains a confounder. The benefit-risk relationship of Moderna COVID-19 Vaccine is not affected by this report.; Sender's Comments: This case concerns a 70-year-old, female patient with medical history of heartbeats increased, who experienced the unexpected non serious events of cardiac disorder, heart rate increased, dyspnoea and chest pain. The events occurred following the second dose of Moderna COVID-19 Vaccine. Ever since the patient got the second dose of the vaccine, she has had "very fast heartbeat" and "heart problems". For months, this happened everyday and lasted almost 40 minutes at times, as reported. The patient stated she went to the ER and the doctor thought she had a heart attack because she had chest pain for 6 minutes, shortness of breath and a fast heartbeat. This lasted several months. Patient stated events no happen once or twice a week, as it has slowed down. Patient attributes this to acupuncture. The rechallenge was not applicable. The reporter assessed the events as related to the product. The medical history of increased heartbeat remains a confounder. The benefit-risk relationship of Moderna COVID-19 Vaccine is not affected by this report.