blood pressure and heart rate go up sometimes; problems with his heart and chest; having a cardio infections because of the funny things going on in my body; heart rate is low/Heart rate is goes down to about 50; having a cardio infections because of the funny things going on in my body; i watch my blood pressure change; chills; soreness of both of my arms; Lower blood pressure/blood pressure and heart rate go up sometimes; decreased oxygen levels; difficulty breathing; higher heart rate compared to my average/blood pressure and heart rate go up sometimes; This spontaneous case was reported by a patient and describes the occurrence of DYSPNOEA (difficulty breathing), TACHYCARDIA (higher heart rate compared to my average/blood pressure and heart rate go up sometimes), HYPERTENSION (blood pressure and heart rate go up sometimes), HYPOTENSION (Lower blood pressure/blood pressure and heart rate go up sometimes) and OXYGEN SATURATION DECREASED (decreased oxygen levels) in a 74-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 011A21A and 011M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No medical history was provided by the reporter.  The patient's past medical history included Aortic aneurysm. Concomitant products included LISINOPRIL, FUROSEMIDE (LASIX [FUROSEMIDE]), TAMSULOSIN HYDROCHLORIDE (FLOMAX [TAMSULOSIN HYDROCHLORIDE]) and DILTIAZEM for an unknown indication.   On 08-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 08-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 10-Mar-2021, the patient experienced DYSPNOEA (difficulty breathing), TACHYCARDIA (higher heart rate compared to my average/blood pressure and heart rate go up sometimes), HYPOTENSION (Lower blood pressure/blood pressure and heart rate go up sometimes), OXYGEN SATURATION DECREASED (decreased oxygen levels), PAIN IN EXTREMITY (soreness of both of my arms) and CHILLS (chills). On an unknown date, the patient experienced HYPERTENSION (blood pressure and heart rate go up sometimes), CARDIAC DISORDER (problems with his heart and chest), CARDIAC INFECTION (having a cardio infections because of the funny things going on in my body), BRADYCARDIA (heart rate is low/Heart rate is goes down to about 50), FEELING ABNORMAL (having a cardio infections because of the funny things going on in my body) and BLOOD PRESSURE FLUCTUATION (i watch my blood pressure change). At the time of the report, DYSPNOEA (difficulty breathing), TACHYCARDIA (higher heart rate compared to my average/blood pressure and heart rate go up sometimes), HYPERTENSION (blood pressure and heart rate go up sometimes), HYPOTENSION (Lower blood pressure/blood pressure and heart rate go up sometimes), OXYGEN SATURATION DECREASED (decreased oxygen levels), CARDIAC DISORDER (problems with his heart and chest), CARDIAC INFECTION (having a cardio infections because of the funny things going on in my body), BRADYCARDIA (heart rate is low/Heart rate is goes down to about 50), FEELING ABNORMAL (having a cardio infections because of the funny things going on in my body), PAIN IN EXTREMITY (soreness of both of my arms), BLOOD PRESSURE FLUCTUATION (i watch my blood pressure change) and CHILLS (chills) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   Treatment medications were not reported.  Patient reported that he had echo-cardiogram done on 22-JUN-2021 and states that he maybe having possible cardio infection.  Patient provided information from cardiac report, which includes atherosclerosis plaque seen in the aortic arch and in the descending thoracic aorta.  Patient reports oxygen level was 92.   Most recent FOLLOW-UP information incorporated above includes: On 24-Jun-2021: Additional events and lab data were added to the case. On 06-Jul-2021: Follow-up information received included: Added medical history, added lab data and added new events. On 04-Aug-2021: NNI Follow-up SD added.