I never went to get the 2nd vaccine as to I didn't want to get worst; I never went to get the 2nd vaccine as to I didn't want to get worst; fast heart beat; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of HEART RATE INCREASED (fast heart beat), PRODUCT DOSE OMISSION ISSUE (I never went to get the 2nd vaccine as to I didn't want to get worst) and TREATMENT NONCOMPLIANCE (I never went to get the 2nd vaccine as to I didn't want to get worst) in a 58-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 025A21A) for COVID-19 vaccination.     Concurrent medical conditions included Asthma since 20-Jul-2000. Concomitant products included ASCORBIC ACID (VITAMIN C PLUS [ASCORBIC ACID]) from 2000 to an unknown date, VITAMIN B12 [VITAMIN B12 NOS] from 2000 to an unknown date, ZINC from 2000 to an unknown date, GINGER [ZINGIBER OFFICINALE RHIZOME] from 2000 to an unknown date, CETIRIZINE HYDROCHLORIDE (ZYRTEC [CETIRIZINE HYDROCHLORIDE]) from 1998 to an unknown date, MONTELUKAST SODIUM (SINGULAIR) from 1998 to an unknown date, COLECALCIFEROL (VITAMIN D [COLECALCIFEROL]) from 2000 to an unknown date and OMEPRAZOLE from 1998 to an unknown date for an unknown indication.   On 03-Mar-2021 at 4:00 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On an unknown date, the patient received dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) at an unspecified dose. On 03-Mar-2021 at 5:30 PM, the patient experienced HEART RATE INCREASED (fast heart beat). On an unknown date, the patient experienced PRODUCT DOSE OMISSION ISSUE (I never went to get the 2nd vaccine as to I didn't want to get worst) and TREATMENT NONCOMPLIANCE (I never went to get the 2nd vaccine as to I didn't want to get worst). At the time of the report, HEART RATE INCREASED (fast heart beat) had not resolved, PRODUCT DOSE OMISSION ISSUE (I never went to get the 2nd vaccine as to I didn't want to get worst) had resolved and TREATMENT NONCOMPLIANCE (I never went to get the 2nd vaccine as to I didn't want to get worst) outcome was unknown. Not Provided    DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 03-Mar-2021, Electrocardiogram: irregular (abnormal) Irregular heart beat.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown Route) and mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.     On 03 Mar 2021, patient experienced a fast heartbeat after 20 minutes. It didn't go away so she went to the doctor the following Monday, on 08 Mar 2021, and they put a heart monitor on her and the doctor confirms that it was associated with the Moderna COVID-19 vaccination. She still felt it today.  Treatment information was not provided by her doctor.   Most recent FOLLOW-UP information incorporated above includes: On 15-Jun-2021: Significant follow up received on 15-Jun-2021. Patient demographics, medical history, concomitant medications, physician visit, AE outcome and second dose details were updated. Another HCP details provided.