I don't know about higher BMI specifically but when I went in for a pre-surgury exam with my doc up here, he did several blood tests for things which would exclude me from the surgury or extend recovery time. Turns out my iron and B12 levels were low, which could increase my healing time, but easily supplemented pre-op. Of course, having a higher BMI would put someone more at risk for those types of dificiencies but I've never heard of just having a high BMI being a problem to much of a problem.
Course I'm not a doctor, that's just what I've experienced so far. If you're really concerned about, call the clinic down there because they do this all the time, or your doctor up here since s/he knows your history.