Hello!
Thank you for asking on HCM!
Regarding you concern, I would like to explain that a careful physical exam, resting ECG and a trans-thoracic cardiac ultrasound, are necessary to investigate cardiac structures (possible
heart chamber dilation, valvular incompetence, etc), as well as to review cardiac performance and what is very important to investigate for abnormally increased
pulmonary artery hypertension, which may be the source of your daughter's complains (chest pain, coughing).
In addition some blood tests, like
complete blood count (rule out secondary polyglobulia), an
arterial blood gas analysis (for possible acid-base disorders) should be checked too.
If the above tests are inconclusive regarding increased pulmonary artery hypertension, then additional cardiac tests are necessary (for example: exercise cardiac stress test coupled with stress cardiac ultrasound).
Hope to have been helpful! Greetings! Dr. Iliri