Hi. Tab metolar xl is known to cause decrease in heart rate so this might be due to the medicine. The ECG report shows bradycardia because anything less than 60 is Bradycardia.
However it doesn't necessarily mean you are having an issue. If you're having symptoms of chest pain, dizziness, breathlessness, blackouts this will mean a problem. Also please also get your ecg reviewed, it depends on the rhythm how seriously these values must be considered.
Next Steps
please review with history and ecg