If your primary doctor believes you might have a heart murmur or irregular beat, he would most likely refer you to:
a phlebotomist.
an echocardiographer.
a cardiovascular perfusionist.
a pulmonary specialist.

An echocardiographer

Explanation:

First step in this case would be ultrasound of the patient's heart i.e. Echocardiography.

Hope it helps!

A cardiovascular prefusionist is the answer

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Your mom and uh your mom!