she was going down the stairs and lights out, passed out Says she has never passed out before.; she fainted after 2nd dose; Blood pressure was dangerously low; This spontaneous case was reported by a consumer and describes the occurrence of LOSS OF CONSCIOUSNESS (she was going down the stairs and lights out, passed out Says she has never passed out before.) and SYNCOPE (she fainted after 2nd dose) in a female patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Heart attack (massive) in January 2021.   On an unknown date, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced LOSS OF CONSCIOUSNESS (she was going down the stairs and lights out, passed out Says she has never passed out before.) (seriousness criterion medically significant), SYNCOPE (she fainted after 2nd dose) (seriousness criterion medically significant) and HYPOTENSION (Blood pressure was dangerously low). The patient was treated with Radiotherapy (Catscan of head) for Loss of consciousness and Radiotherapy (Catscan of head) for Hypotension. At the time of the report, LOSS OF CONSCIOUSNESS (she was going down the stairs and lights out, passed out Says she has never passed out before.), SYNCOPE (she fainted after 2nd dose) and HYPOTENSION (Blood pressure was dangerously low) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood pressure measurement: low (Low) dangerously low. On an unknown date, Computerised tomogram: results not provided (Inconclusive) Results not provided.         No Concomitant medication provided.  Patient was taken by ambulance to the emergency room patient stated that doctors told her it is very common that 15 hours after 2nd dose that fainting was common and did not report myocarditis or pericarditis diagnosis. Stated she referred to her PCP about possibility of receiving the booster and stated she was high risk and was a heart patient.  No treatment medication reported.  Company Comment - This case concerns female patient of unknown age with medical history of heart attack, who experienced the serious (medically significant) unexpected event of loss of consciousness and the expected event of syncope. The events occurred on an unknown date after the second dose of mRNA-1273 vaccine. The rechallenge was unknown. Patient's medical history of heart attack remains a confounder. The benefit-risk relationship of the mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This case concerns female patient of unknown age with medical history of heart attack, who experienced the serious (medically significant) unexpected event of loss of consciousness and the expected event of syncope. The events occurred on an unknown date after the second dose of mRNA-1273 vaccine. The rechallenge was unknown. Patient's medical history of heart attack remains a confounder. The benefit-risk relationship of the mRNA-1273 vaccine is not affected by this report.