Praise then darkness, and creation unfinished

Can anyone recommend a cardiologist who is reasonably convenient to Madison Avenue and 31st Street, or failing that, to the A train anywhere in Manhattan? This is for follow-up on the shortness of breath, now that we've ruled out lung stuff. (If not, my GP has suggested someone, but they're in Riverdale, which would mean either arranging to work from home, or taking at least half a day of vacation time.)

I may yet just see who is in my insurance plan's list, but an actual recommendation would be better.