more than 35 days for administration of second dose; fluttering of heart; shortness of breath; chest pain; This spontaneous case was reported by a consumer and describes the occurrence of CARDIAC FLUTTER (fluttering of heart), DYSPNOEA (shortness of breath) and CHEST PAIN (chest pain) in a 59-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 00621A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COVID-19 (patient was Quarantine during Christmas week in DEC 2020 and 2021 January's first week) in December 2020. Concurrent medical conditions included Hypertension (Patient stated that Blood pressure usually affects his head, not his chest). Concomitant products included ACETYLSALICYLIC ACID (BABY ASPIRIN) for an unknown indication.    On 03-Aug-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 16-Aug-2021, the patient experienced CARDIAC FLUTTER (fluttering of heart) (seriousness criterion medically significant), DYSPNOEA (shortness of breath) (seriousness criterion medically significant) and CHEST PAIN (chest pain) (seriousness criterion medically significant). On an unknown date, the patient experienced INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (more than 35 days for administration of second dose). At the time of the report, CARDIAC FLUTTER (fluttering of heart), DYSPNOEA (shortness of breath) and CHEST PAIN (chest pain) outcome was unknown and INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (more than 35 days for administration of second dose) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Blood cholesterol: high (High) Reporter  mentioned that 3 months ago patient cholesterol was fine, but now his cholesterol is high.. In 2021, Cardiac stress test: normal (normal) normal. On 06-Aug-2021, Blood pressure measurement: normal (normal) nearly perfect. On 06-Aug-2021, Electrocardiogram: normal (normal) normal and normal (normal) normal. On 06-Aug-2021, X-ray: normal (normal) normal.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       Cardiologist diagnosed that the patient had to do a heart cath. There was 30% of blockage stuff, but nothing that would give him a heart attack. He don't want to acknowledge that this has to do anything with the shot.   Patient was on higher dose of cholesterol medication , an another blood pressure medication, nitroglycerin pill but the patient has not started on the last one.  Treatment information was not provided. History of Myocarditis/Pericarditis: No heart problems.  Company Comment: This case refers to a 59-year-old male patient with a medical history of hypertension who experienced the unexpected events of Cardiac Flutter, Dyspnoea and Chest Pain approximately 13 days after the first dose of Moderna COVID-19 Vaccine. No causality assessment was provided by the reporter. The medical history of hypertension remains a confounder. The benefit-risk relationship of Moderna COVID-19 Vaccine is not affected by this report.; Sender's Comments: This case refers to a 59-year-old male patient with a medical history of hypertension who experienced the unexpected events of Cardiac Flutter, Dyspnoea and Chest Pain approximately 13 days after the first dose of Moderna COVID-19 Vaccine. No causality assessment was provided by the reporter. The medical history of hypertension remains a confounder. The benefit-risk relationship of Moderna COVID-19 Vaccine is not affected by this report.