felt like my heart was coming out of my mouth; increased heart beat/increased all the way up to 169 and it goes up to 150s; extremely high fever/ around 102 [after second dose]; This spontaneous case was reported by a consumer and describes the occurrence of HEART RATE INCREASED (increased heart beat/increased all the way up to 169 and it goes up to 150s) in a 66-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 030M20A and 029L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 17-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 14-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 14-Feb-2021, the patient experienced PYREXIA (extremely high fever/ around 102 [after second dose]). On 15-Feb-2021, the patient experienced HEART RATE INCREASED (increased heart beat/increased all the way up to 169 and it goes up to 150s) (seriousness criterion medically significant). On 16-Feb-2021, the patient experienced FEELING ABNORMAL (felt like my heart was coming out of my mouth). On 15-Feb-2021, PYREXIA (extremely high fever/ around 102 [after second dose]) had resolved. At the time of the report, HEART RATE INCREASED (increased heart beat/increased all the way up to 169 and it goes up to 150s) had not resolved and FEELING ABNORMAL (felt like my heart was coming out of my mouth) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 14-Feb-2021, Body temperature: around 102 (High) Body temperature increased.. On 15-Feb-2021, Heart rate: increased (High) increased. On an unknown date, Heart rate: 169 (High) increased and 150 (High) 150s.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   Concomitant product was not provided by the reporter. Treatment information was not provided  It was reported that patient did not have any symptoms after the first dose. After the second dose, he had extremely high fever, around 102 or so. The day after that he had increased heart beat. It persisted and increased all the way up to 169. He felt like his heart was coming out of his mouth. He never experienced increased heart rate before. Every month or two, he gets the same increased heart rate. It goes up to 150s. He checked with a cardiologist, who said he does not know what it was. He was concerned because it comes back.  This case concerns a 57-year-old male patient with no reported relevant medical history, who experienced the unexpected event of heart rate increased. The event occurred approximately 2 days after second dose of Spikevax. The rechallenge was negative. The benefit-risk relationship of Spikevax is not affected by this report.; Sender's Comments: This case concerns a 57-year-old male patient with no reported relevant medical history, who experienced the unexpected event of heart rate increased. The event occurred approximately 2 days after second dose of Spikevax. The rechallenge was negative. The benefit-risk relationship of Spikevax is not affected by this report.