THIS WEEK ON BOSTON MED: HEARTBREAK, HOPE AND FAITH -- A FAMILY AT AN EMOTIONAL INTERSECTION

Plus: A Senior Surgeons Sets a High Bar for a Cocky Resident

The Cyrs are a young couple just having a baby until they find themselves engulfed in a medical nightmare. Their son is born with a critical heart defect requiring immediate surgery. The overwhelmed couple put their faith in Mass General's lead pediatric heart surgeon. But things go awry during the operation and the family rides an emotional rollercoaster. It's a tale of heartbreak, hope and faith in which all parties are pushed to the limit. Episode 6 of "Boston Med" airs THURSDAY, JULY 29 (10:00-11:00 p.m., ET) on the ABC Television Network. A trailer for this episode can be viewed here.

Hasan Alam is a trauma surgeon faced with a desperate situation, a critically injured man who is bleeding to death. Alam knows that a second of hesitation on his part will doom the patient.

Daniel Dibardino, the cocky but skilled senior resident from earlier episodes, returns to help save a young mother's life in a challenging operation. His technique is scrutinized by a veteran surgeon in a manner rarely seen by the non-medical public. Yet Dibardino considers it a valuable learning experience, just part of the training needed to become a top surgeon in his own right.

Rachel Clark and Kelly Wright are Ob-Gyn residents who hail from the South. They are also the closest of friends. Both of them are struggling to maintain a personal life in the face of a crushing caseload and brutal work schedules. By the end of this episode, both women will do a 180-degree reversal on the relationship front.

Picking up where "Hopkins" left off, "Boston Med" travels to a city renowned for medical excellence and home to three superb American hospitals: Massachusetts General Hospital, Brigham and Women's Hospital, and Children's Hospital. Over four months, ABC cameras had unparalleled access to hospital staffs and patients. From operating rooms to end-of-life meetings, "Boston Med" explores the culture of doctors and nurses and the conversations that happen outside the patient's earshot. This unsparing look at the ups and downs of hospital care holds many surprises for viewers.

Terence Wrong is producer and executive producer. Rudy Bednar is senior executive producer. Sedika Mojadidi and Carl Hansen are supervising producers of "Boston Med."

For more information on Boston Med visit bostonmed.abcnews.com.