mild heart attack; weird breathing issues, It was short bursts of breathing issues; breastbone pain; This spontaneous case was reported by a consumer and describes the occurrence of MYOCARDIAL INFARCTION (mild heart attack) and DYSPNOEA (weird breathing issues, It was short bursts of breathing issues) in a 70-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 028A21A and 027A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COPD since an unknown date and Cardiac catheterization (stent was placed.) on 16-Apr-2021. Concurrent medical conditions included Smoker.   On 03-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 31-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 02-Apr-2021, the patient experienced DYSPNOEA (weird breathing issues, It was short bursts of breathing issues) (seriousness criterion hospitalization). On 15-Apr-2021, the patient experienced MYOCARDIAL INFARCTION (mild heart attack) (seriousness criteria hospitalization and medically significant). On an unknown date, the patient experienced BREAST PAIN (breastbone pain). The patient was hospitalized from 15-Apr-2021 to 17-Apr-2021 due to DYSPNOEA and MYOCARDIAL INFARCTION. The patient was treated with PARACETAMOL (TYLENOL REGULAR) for Adverse event, at an unspecified dose and frequency. At the time of the report, MYOCARDIAL INFARCTION (mild heart attack), DYSPNOEA (weird breathing issues, It was short bursts of breathing issues) and BREAST PAIN (breastbone pain) outcome was unknown.            Patient reports that she had her first Moderna vaccine on 03 Mar 2021 with no side effects. Her second injection was on 31 Mar 20 21. She started having weird breathing problems two days after second vaccine. It was short bursts of breathing issues feeling in breastbone off and on with pain. It seemed fleeting but got progressively worse. A week later it was so severe, so she went to the hospital. On the 15 Apr 2012, the  hospital reported that she  had suffered a mild heart attack.  She was released from the hospital on 17 Apr2021.  Her breathing issue still remains.  She can walk one and a half mile with no breathing issues then suddenly it will appear out of nowhere even if she is just sitting in a chair.  She has an inhaler which she rarely uses but if she uses her inhaler during one of these breathing episodes it does not help at all. She is following up with a pulmonologist on  23 Jul2021.   Treatment includes cardiac catheterization and stent placement on 16-APR-2021.  Action taken with mRNA-1273 in response to the event was not applicable.   Patient's advanced age and medical history of COPD and smoking could be risk factors for the events. Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded. Very limited information regarding these events has been provided at this time. Further information has been requested.; Sender's Comments: Patient's advanced age and medical history of COPD and smoking could be risk factors for the events.Based on the current available information and temporal association between the use of the product and the start date of the events,a causal relationship cannot be excluded. Very limited information regarding these events has been provided at this time.Further information has been requested.