First of all, you're breaking adsense guidelines since I counted four separate Google ad blocks on your home page.
(The rule is 3)
I would for sure take the Google Ad out of your header. It might be a better idea to put your site name in the header and put a banner ad at the top of your site.
I was also quite surprised to see no author name and no list of resources on a site full of medical articles.
For
SEO purposes, you are much better off to use text for text-based information, such as that in your tables than using graphics. Moreover, those who use screen readers and those who otherwise have images disabled are not able to access your graphical tables.
Your design is unimpressive. There are just too many boxes for my taste. You might try better use of white space in line-height, margins, and padding to make reading easier. You should also be using more headings (h1, h2 etc) and lists (either bulleted or numbered) to make your content easier to read and more appealing to the eye.
Content wise, if you're writing for medical colleagues, I imagine your content is quite readable. For the lay person it's very difficult to follow and understand.