left bundle branch went haywire; heart problems; weak; palpitations; "a bad reaction to both shots that almost killed her"; did not have the 2nd dose of the vaccine; painful shingles; This spontaneous case was reported by a consumer and describes the occurrence of BUNDLE BRANCH BLOCK LEFT (left bundle branch went haywire), ARRHYTHMIA (heart problems), ASTHENIA (weak) and PALPITATIONS (palpitations) 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.     No Medical History information was reported.    On 28-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In March 2021, the patient experienced HERPES ZOSTER (painful shingles). On 01-May-2021, the patient experienced BUNDLE BRANCH BLOCK LEFT (left bundle branch went haywire) (seriousness criterion hospitalization). In May 2021, the patient experienced ARRHYTHMIA (heart problems) (seriousness criteria hospitalization and medically significant). In 2021, the patient experienced ASTHENIA (weak) (seriousness criterion hospitalization) and PALPITATIONS (palpitations) (seriousness criterion hospitalization). On 13-Jul-2021, the patient experienced INTENTIONAL DOSE OMISSION (did not have the 2nd dose of the vaccine). On an unknown date, the patient experienced VACCINATION COMPLICATION ("a bad reaction to both shots that almost killed her"). The patient was treated with METOPROLOL at a dose of 2x a day. At the time of the report, BUNDLE BRANCH BLOCK LEFT (left bundle branch went haywire), ARRHYTHMIA (heart problems), ASTHENIA (weak), PALPITATIONS (palpitations), VACCINATION COMPLICATION ("a bad reaction to both shots that almost killed her"), INTENTIONAL DOSE OMISSION (did not have the 2nd dose of the vaccine) and HERPES ZOSTER (painful shingles) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Heart rate: rapid (High) rapid.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Concomitant medications were not reported. It was reported that, she had the 1st dose on 28Feb2021. Place of vaccination, route, dose, lot number and expiration date were not provided. She did not have the 2nd dose of the vaccine. 12 hours after the vaccination, she had shingles. She had two months (Mar and April) of painful shingles. When the shingles started to get better her heart problems started to manifest although she claims that she felt she had these while she was still having the shingles- she felt weak, had palpitations and rapid heart rate. She ended up in the emergency room (ER) on 01May2021 where her heart was found to be out of sinus rhythm. She reports that her left bundle branch went haywire. She was hospitalized for over a week for this issue. She states that she has been permanently altered. She stated that, she was young and did not have any history of previous heart disease. She was taking Metoprolol 2x a day.  Company comment: Very limited information regarding  these events have been provided at this time. No further information  is expected at this time.   Most recent FOLLOW-UP information incorporated above includes: On 13-Jul-2021: Significant follow up-serious event updated, patient information appended; Sender's Comments: Very limited information regarding  these events have been provided at this time. No further information  is expected at this time.