Heart rate went up to 234 bpm; complications of the pacemaker- he had to get blood transfusion; Blood transfusion; This spontaneous case was reported by a consumer and describes the occurrence of HEART RATE INCREASED (Heart rate went up to 234 bpm), COMPLICATION ASSOCIATED WITH DEVICE (complications of the pacemaker- he had to get blood transfusion) and TRANSFUSION (Blood transfusion) in a 76-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     The patient's past medical history included Stroke (Stroke (2009)) in 2009. Concurrent medical conditions included Penicillin allergy.    On 21-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. In August 2021, the patient experienced HEART RATE INCREASED (Heart rate went up to 234 bpm) (seriousness criterion hospitalization), COMPLICATION ASSOCIATED WITH DEVICE (complications of the pacemaker- he had to get blood transfusion) (seriousness criterion hospitalization) and TRANSFUSION (Blood transfusion) (seriousness criterion hospitalization). The patient was hospitalized for 21 days due to COMPLICATION ASSOCIATED WITH DEVICE, HEART RATE INCREASED and TRANSFUSION. The patient was treated with Surgery (Insertion of pacemaker) for Heart rate increased. At the time of the report, HEART RATE INCREASED (Heart rate went up to 234 bpm), COMPLICATION ASSOCIATED WITH DEVICE (complications of the pacemaker- he had to get blood transfusion) and TRANSFUSION (Blood transfusion) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In August 2021, Heart rate: 234 (High) 234 bpm.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       Treatment: Patient had to get blood transfusion for pacemaker complication, Electro-shock in ER and insertion of pacemaker for increased heart rate  Concomitant medications was not provided by the reporter.  Patient stated that 2 weeks after receiving the 1st dose of the Moderna COVID 19 vaccine his heart rate went up to 234 bpm. He called 911, the paramedics gave him a shot, when that did not work, they electro-shock him 4 times before his heart rate dropped to 65 bpm. When he got to the ER, he was told he needed a pacemaker. He ended up staying in the hospital for 21 days due to complications of the pacemaker and he got blood transfusion. He said that he was not diagnosed with Myocarditis/pericarditis, he does not remember what he was diagnosed with. And later he heard in the news that heart complications were possible with Moderna.  He not remembered any of the medication that was given to him at the hospital. He does not had his vaccination card with him at the time of the call. COMPANY COMMENT: This is an spontaneous case concerning a 76-years-old male patient with clinical history of Stroke and penicillin allergy who experienced the unexpected events of HEART RATE INCREASED, COMPLICATION ASSOCIATED WITH DEVICE and BLOOD TRANSFUSION  unknown days after 1st dose of RNA-1273.   The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report. The case was assessed as serious due to hospitalization; Sender's Comments: COMPANY COMMENT: This is an spontaneous case concerning a 76-years-old male patient with clinical history of Stroke and penicillin allergy who experienced the unexpected events of HEART RATE INCREASED, COMPLICATION ASSOCIATED WITH DEVICE and BLOOD TRANSFUSION  unknown days after 1st dose of RNA-1273.   The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report. The case was assessed as serious due to hospitalization