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I would recommend as follows:
Detailed Answer:
Hello!
Welcome to 'Ask A Doctor' service!
I agree with your doctor that these changes in the ECG could be related to different possible causes like a lung disorder, arterial hypertension, thyroid hormone levels, or your thoracic constitution.
For this reason, I would recommend performing a lung angio CT scan and pulmonary function tests in order to exclude possible lung disorders.
It is also important to closely monitor your blood pressure values and checking your thyroid hormone levels for possible thyroid gland dysfunction.
Hope you will find this answer helpful!
I remain at your disposal for any further questions whenever you need!
Kind regards,
Dr.Ilir Sharka,
Cardiologist
My opinion as follows:
Detailed Answer:
Hello again!
Thank you for the additional information!
Coming to this point, it is important checking pulmonary function (I suppose you have done this test on Friday).
Anxiety could also trigger shortness of breath.
Regarding Propranolol, I don't think that it has any influence in all this clinical situation unless you have asthma (as it is known to exacerbate asthma).
Hope you will find this answer helpful!
Wishing all the best,
Dr.Iliri