It is better to follow the advice of Cardiologist and till he gives the clearance you should not go for extraction and rather no Oral Surgeon will go ahead with extraction without clearance from your treating cardiologist.
Tooth extraction is fairly simple procedure but you cannot take chance and it can only be done after clearance from your Cardiologist.
Next Steps
Visit your treating cardiologist first followed by oral surgeon.
Health Tips
It is better that you go to some multispeciality hospital where all emergency facilities are available. Precaution is better though nothing may happen.