Had a severe blood clot; Had a heart attack; He had plague of 80/90% on his heart; They found two more blockages; Tightness in his shoulder blades; Tightness in chest from armpit to armpit; This spontaneous case was reported by a consumer and describes the occurrence of THROMBOSIS (Had a severe blood clot), MYOCARDIAL INFARCTION (Had a heart attack), ARTERIOSCLEROSIS (He had plague of 80/90% on his heart) and ATRIOVENTRICULAR BLOCK (They found two more blockages) in a 79-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 18-Nov-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 22-Nov-2021, the patient experienced JOINT STIFFNESS (Tightness in his shoulder blades) and CHEST DISCOMFORT (Tightness in chest from armpit to armpit). On 23-Nov-2021, the patient experienced THROMBOSIS (Had a severe blood clot) (seriousness criteria hospitalization and medically significant), MYOCARDIAL INFARCTION (Had a heart attack) (seriousness criteria hospitalization and medically significant), ARTERIOSCLEROSIS (He had plague of 80/90% on his heart) (seriousness criteria hospitalization and medically significant) and ATRIOVENTRICULAR BLOCK (They found two more blockages) (seriousness criteria hospitalization and medically significant). The patient was hospitalized from 23-Nov-2021 to 27-Nov-2021 due to ARTERIOSCLEROSIS, ATRIOVENTRICULAR BLOCK, MYOCARDIAL INFARCTION and THROMBOSIS. The patient was treated with Surgery (Stent placed in heart) for Thrombosis; Surgery (Stent placed in heart) for Myocardial infarction; Surgery (Stent placed in heart) for Arteriosclerosis and Surgery (Stent placed in heart) for Atrioventricular block. At the time of the report, THROMBOSIS (Had a severe blood clot), MYOCARDIAL INFARCTION (Had a heart attack), ARTERIOSCLEROSIS (He had plague of 80/90% on his heart), ATRIOVENTRICULAR BLOCK (They found two more blockages), JOINT STIFFNESS (Tightness in his shoulder blades) and CHEST DISCOMFORT (Tightness in chest from armpit to armpit) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 22-Nov-2021, Blood pressure measurement: 165/101 (High) Blood Pressure 165/101.         Patient was discovered that he had a severe blood clot and a heart attack. Patient was then sent to hospital and he had a stent placed in his heart. During surgery they found two more blockages and also plague that was 80/90% on his heart. On 26th NOV 2021 he had two more stents placed in his heart. On 27th NOV 2021 patient was discharged from hospital.  No concomitant medication were provided. No treatment medication were provided.  This case concerns a 79-year-old male patient with no medical history, who experienced the unexpected serious event of Arteriosclerosis, and adverse events of special interest, Thrombosis, Myocardial Infarction, and Atrioventricular Block. The events, which caused hospitalization for the patient, occurred approximately 4 days after receiving the third dose of mRNA-1273 Vaccine. The patient was hospitalized for 5 days and was treated with Surgery (Stent placed in heart) for Thrombosis, Surgery (Stent placed in heart) for Myocardial infarction, Surgery (Stent placed in heart) for Arteriosclerosis and Surgery (Stent placed in heart) for Atrioventricular block. The rechallenge was not applicable since only information about the third dose was disclosed. No hospitalization details were disclosed. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.; Sender's Comments: This case concerns a 79-year-old male patient with no medical history, who experienced the unexpected serious event of Arteriosclerosis, and adverse events of special interest, Thrombosis, Myocardial Infarction, and Atrioventricular Block. The events, which caused hospitalization for the patient, occurred approximately 4 days after receiving the third dose of mRNA-1273 Vaccine. The patient was hospitalized for 5 days and was treated with Surgery (Stent placed in heart) for Thrombosis, Surgery (Stent placed in heart) for Myocardial infarction, Surgery (Stent placed in heart) for Arteriosclerosis and Surgery (Stent placed in heart) for Atrioventricular block. The rechallenge was not applicable since only information about the third dose was disclosed. No hospitalization details were disclosed. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.