Feeling loosy/wobbly feeling; shortness of breath; heart rate of over 120/min; BP was at 105/67 / blood pressure unusually low about 98 over 60; This spontaneous case was reported by a consumer and describes the occurrence of FEELING ABNORMAL (Feeling loosy/wobbly feeling), DYSPNOEA (shortness of breath), HEART RATE INCREASED (heart rate of over 120/min) and HYPOTENSION (BP was at 105/67 / blood pressure unusually low about 98 over 60) in a 79-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 939904, 025D21A and 042620A) for COVID-19 vaccination.     Previously administered products included for Product used for unknown indication: Flu shot (Flu shot one week prior to the third dose.). Past adverse reactions to the above products included No adverse event with Flu shot. Concurrent medical conditions included Atrial fibrillation. Concomitant products included RIVAROXABAN (XARELTO), AMIODARONE, LOSARTAN and LEVOTHYROXINE for an unknown indication.   On 09-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 09-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 29-Oct-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 30-Oct-2021, the patient experienced FEELING ABNORMAL (Feeling loosy/wobbly feeling), DYSPNOEA (shortness of breath), HEART RATE INCREASED (heart rate of over 120/min) and HYPOTENSION (BP was at 105/67 / blood pressure unusually low about 98 over 60). At the time of the report, FEELING ABNORMAL (Feeling loosy/wobbly feeling) outcome was unknown, DYSPNOEA (shortness of breath) and HEART RATE INCREASED (heart rate of over 120/min) had not resolved and HYPOTENSION (BP was at 105/67 / blood pressure unusually low about 98 over 60) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 30-Oct-2021, Blood pressure measurement: 105/67 mmHg (Low) blood pressure unusually low about 98 over 60. Patients normal blood pressure is about 110-130 over 60-70. On 30-Oct-2021, Heart rate: 120/min per minute (High) Over 120 and went down to 92-95 after few days. On 05-Nov-2021, Heart rate: 90 per minute (Low) in the mid 90 range (94-97)/min. On an unknown date, Heart rate: 100 per minute (Low) with blood pressure remaining low.         Treatment information was not provided.  For 2 more days patients heart rate was dropped to be just over 100/min, with blood pressure remaining lowand patient feeling out of breath. Starting 03-Nov-2021 to 05-Nov-2021) patients heart rate dropped in the mid 90 range (94-97)/min. Blood pressure seems to be in normal range but patient still have some shortness of breath. It was stated that patient was an AFib patient and as he was worried about his situation. Patient contacted the office of his Neurologist. His advised was to keep an eye on it, if it gets worse go in for a check-up and to see him on 01-Nov-2022.   This case was linked to MOD-2021-372729 (Patient Link).   Most recent FOLLOW-UP information incorporated above includes: On 05-Nov-2021: Followup received included concomitant medication and additional event.