Went to ER on 11Mar2021, where they ran few test and diagnosed her with Pulmonary Embolism in the middle and lower lib of the right lung; Felt very high pulse rate; Short of breath/felt like she couldn't catch her breath under the mask; This spontaneous case was reported by a patient and describes the occurrence of PULMONARY EMBOLISM (Went to ER on 11Mar2021, where they ran few test and diagnosed her with Pulmonary Embolism in the middle and lower lib of the right lung), HEART RATE INCREASED (Felt very high pulse rate) and DYSPNOEA (Short of breath/felt like she couldn't catch her breath under the mask) in a 44-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. Unknown) for COVID-19 vaccination.     Concomitant products included METOPROLOL for an unknown indication.   On 10-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 10-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 11-Mar-2021, the patient experienced PULMONARY EMBOLISM (Went to ER on 11Mar2021, where they ran few test and diagnosed her with Pulmonary Embolism in the middle and lower lib of the right lung) (seriousness criteria hospitalization, medically significant and life threatening), HEART RATE INCREASED (Felt very high pulse rate) (seriousness criteria hospitalization and life threatening) and DYSPNOEA (Short of breath/felt like she couldn't catch her breath under the mask) (seriousness criteria hospitalization and life threatening). The patient was hospitalized on 11-Mar-2021 due to DYSPNOEA, HEART RATE INCREASED and PULMONARY EMBOLISM. The patient was treated with APIXABAN (ELIQUIS) ongoing since an unknown date at an unspecified dose and frequency and ACETYLSALICYLIC ACID (ASPIRIN (E.C.)) for prduct used for unknown indication, at an unspecified dose and frequency. At the time of the report, PULMONARY EMBOLISM (Went to ER on 11Mar2021, where they ran few test and diagnosed her with Pulmonary Embolism in the middle and lower lib of the right lung), HEART RATE INCREASED (Felt very high pulse rate) and DYSPNOEA (Short of breath/felt like she couldn't catch her breath under the mask) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Heart rate: 150 - 159 (Inconclusive) between 150 - 159.         It was reported that, after vaccination, the next day morning before going to work she was felt very high pulse rate, short of breath. Later, she went to work to school to teach but felt like she couldn't catch her breath under the mask. Her pulse was between 150-159, so she was asked to see her physician. She went to ER on 11-Mar-2021, and few tests were run and she was diagnosed with pulmonary embolism in the middle and lower lib of the right lung. She was hospitalized for 1 night and discharged on following day. The patient was also prescribed Eliquis (blood thinner) and was also taking lower dose of aspirin.  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.; Sender's Comments: 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.