Grey’s Anatomy Season 7 Episode 2 (Grey’s Anatomy s07e02) with title “Shock to the System” aired on Thursday, September 30th 2010 at 09:00 pm via ABC Network.
Here is summary for :

Meredith finally tells Derek about her miscarriage (and her pregnancy). She’s also cleared to return to surgery, but Alex can’t operate until he has the bullet removed from his chest, and Cristina experiences post-traumatic stress disorder in the OR while performing a surgery.

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