Electric like impulses in the shot arm; Pulse still hovers close to 100 bpm/heart pounding; Had to sit up in bed to breathe and moved to a straight chair in the living room to sleep; limited ability to walk; Became much weaker/Weakness; I need to stop twice while climbing the stairs in my home and still need to rest at the top; This spontaneous case was reported by a consumer and describes the occurrence of ELECTRIC SHOCK SENSATION (Electric like impulses in the shot arm), PALPITATIONS (Pulse still hovers close to 100 bpm/heart pounding), ORTHOPNOEA (Had to sit up in bed to breathe and moved to a straight chair in the living room to sleep), GAIT DISTURBANCE (limited ability to walk) and ASTHENIA (Became much weaker/Weakness) in a 79-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 012L20A and 012L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Mitral valve replacement (Mitral valve replacement was carried out 8 years ago and now not under any physical restrictions.). Concurrent medical conditions included AFib (Since 40 years and did not take any medications since 8 years, but after CoVID-19 shot it affected the condition) since April 1980. Concomitant products included METOPROLOL for AFib, FUROSEMIDE from 15-Feb-2021 to an unknown date for Diuresis.   On 18-Jan-2021 at 9:30 AM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 15-Feb-2021 at 10:00 AM, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 15-Feb-2021, the patient experienced ELECTRIC SHOCK SENSATION (Electric like impulses in the shot arm), PALPITATIONS (Pulse still hovers close to 100 bpm/heart pounding), ORTHOPNOEA (Had to sit up in bed to breathe and moved to a straight chair in the living room to sleep), GAIT DISTURBANCE (limited ability to walk), ASTHENIA (Became much weaker/Weakness) and FATIGUE (I need to stop twice while climbing the stairs in my home and still need to rest at the top). At the time of the report, ELECTRIC SHOCK SENSATION (Electric like impulses in the shot arm), PALPITATIONS (Pulse still hovers close to 100 bpm/heart pounding), ORTHOPNOEA (Had to sit up in bed to breathe and moved to a straight chair in the living room to sleep), GAIT DISTURBANCE (limited ability to walk), ASTHENIA (Became much weaker/Weakness) and FATIGUE (I need to stop twice while climbing the stairs in my home and still need to rest at the top) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 07-Jan-2020, Blood pressure measurement: 144/93 (abnormal) average blood pressure was 144/93. On 07-Jan-2020, Heart rate: 63 (abnormal) pulse was same in all 6 readings. On 23-Jan-2021, Heart rate: 93,70,63,77,72,50 (abnormal) 6 readings took after the first vaccine shot. On 31-Jan-2021, Heart rate: 102 (abnormal) previous few days experienced as weaker, breathing difficulty while sleeping and could not walk with same pace. On an unknown date, Heart rate: 60 (abnormal) previous 12 reading recorded as 60, closely monitored the heart rate for past 10 years and in 2020 measured it 500 times.   No treatment medication was reported by reporter After 2 months patient experienced recovering and improving from breathing capacity and walking ability. Concomitant medications were continued as 1 per day until FEB-2021.   This case was linked to MOD-2021-114866 (Patient Link).   Most recent FOLLOW-UP information incorporated above includes: On 03-May-2021: NNI On 14-Jul-2021: Added patient demographics, relevant history updated, first dose detail, second dose lot number, concomitant medication added