Senior executives and a team of medical staff at a Chinese hospital in the central city of Xi’an are under fire after the medical workers took to snapping and posting online a series of jolly selfies in the operating room after successful surgeries.

In a case that seems tailor-made to underline the dangers of abusing social media at work, the doctors and nurses, clad in green and masked in blue, are seen in the selfies mugging for the camera while posing next to apparently still-unconscious patients. Some have their arms akimbo....