Plus: A Gay HIV-Positive Veteran of the Gulf War is on Track to Get a New Heart Until the Transplant Goes Awry

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For a full year ABC News cameras had unprecedented access to document the mayhem and the miracles that occur daily inside the walls of Columbia and Weill Cornell Medical Centers - the crown jewels of the prestigious New York-Presbyterian Hospital in New York City - for the eight-part series " NY Med." Lutheran Medical Center also participated, adding a Brooklyn dimension to the series. In "Episode 103," which airs TUESDAY, JULY 24 (10:00-11:00 p.m., ET), viewers will meet the following patients, doctors and nurses:

John Rankl, a veteran of the Gulf War who is also HIV positive, has been overcoming the odds his entire life. Now it is a pump that keeps his heart beating and any hope of a future depends on a transplant, but when a donor heart becomes available surgeons accidentally damage it during the procurement.

Dr. Oz finds himself in both the roles of a patient and as a doctor after he decides to follow his own advice and submit to a colonoscopy that he has been putting off. The results are not what he expects. Plus, he raids various staff lounges intent on busting colleagues with bad dietary habits.

Tara Margarella is a feisty, Brooklyn-born chief resident in trauma surgery. What gets her pumped up is a Friday night when multiple gunshot, stabbing and beating traumas roll in the door. She believes that just because your hands might be deep in a chest cavity, it doesn't mean you shouldn't do your nails and look like a lady. Her husband wants her to tattoo "I'm married" on her forehead to keep propositioning patients at bay.

ER Nurse Katie Duke returns in this episode to treat a charming young woman who has cut her forehead and broken her nose in a taxi accident. She also encounters an engaging bouncer arrested for fighting outside his club.

"NY Med" follows the irascible, compassionate and, at times, cocky attending surgeons who try to change the trajectory of lives by relying on sheer medical brilliance and a healthy dose of old fashioned good luck. The eight-part series takes a candid look at how cutting edge medicine often makes the difference, although even the best surgeons can find themselves flirting with disaster. The raucous ER staff trades jibes with strong-willed New Yorkers in moments that can be poignantly heartbreaking or off-the-hook hilarious. These doctors spend far more time with each other than with their families, developing complicated and intertwined personal relationships.

Terence Wrong is executive producer of "NY Med." Erica Baumgart and Chris Perera are supervising producers. Monica DelaRosa is series producer and Andy Genovese is the broadcast producer.