### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Approx 2 months I started suffering from dizziness, noticed my pulse was irregular. I have had 2 ecgs the first said abnormal qrst contour consistent with old inferior mi and non specific st depression. the second showed pvcs and prolonged qt. I have just had a 24hr holter which showed over 3000 pvcs, sinus tachcardia with some bigeminy and trigeminy. My gp told me this is nothing to worry about and is referring me to cardiology as routine. I have also been having left arm pain and pain radiating into my left neck and shoulder. the last couple of days I am experiencing a severe stabbing pain upper left chest below collar bone and the arm pain is worse. The pain is intermittent but lasting atleast 30 mins, sometimes hours. Should I be concerned? or should I wait for my appointment which will be around 2 months?many thanks Jackie

### output:

Hips more than 300o in an ECG are to be taken seriously, 3 or more PCs taken together in succession are called nonsustained ventricular tachycardia, if duration is less than 30 sec, if duration is more than 30 seconds it's called ventricular tachycardia. Most common cause of PCs in ECG are ischemic myocardium, that is when blood supply to heart is less or compromised, inferior wall me also signifies it. Yes you should be very concerned about it few baseline investigations like 2d echo tread mill test should be done as early as possible to identify ischemia to heart. Medicines like beta blockers and nitrates could be started initially by GP before you reach a cardiologist