Original sentence: After 2 hours of breathing air without hydrogen sulfide the mice returned to normal.After they lost about half their blood the remaining blood was replaced with a chilled saline solution.As the body temperature reached 10 °C the damaged blood vessel was repaired and the blood was returned.Further studies are needed to see if the gas had poisonous effects on the brain.In July 2005 scientists at the University of Pittsburgh's Safar Center for Resuscitation Research announced they had managed to bring dogs back to life, most of them without brain damage, by draining the blood out of the dogs' bodies and putting an ice cold solution into their circulatory systems, which in turn keeps the bodies alive in stasis.On January 20, 2006, doctors from the Massachusetts General Hospital in Boston announced they had placed pigs in suspended animation by a similar technique.On October 9, 2006, the Massachusetts General Hospital in Boston announced they had been able to hibernate mice using the same method.The laboratory of Mark Roth placed the mice were placed in a chamber containing 80 ppm hydrogen sulfide for a duration of 6 hours.The method was tested 200 times with a 90 percent success rate.The pigs' were anaesthetised and a major blood loss was induced.Their heart rate was slowed down from 500 to 200 beats per minute, respiration fell from 120 to 25 breaths per minute and body temperature dropped to 30 °C (natural: 39 °C)
Edited sentence: In July 2005 scientists at the University of Pittsburgh's Safar Center for Resuscitation Research announced they had managed to bring dogs back to life with no brain damage by draining the blood out of the dogs' bodies and putting an ice cold solution into their circulatory systems, which in turn keeps the bodies alive in stasis.On January 20, 2006, doctors from the Massachusetts General Hospital in Boston announced they had placed pigs in suspended animation, and then revived them with a 90 percent success rate.On October 9, 2006, they announced they had been able to hibernate mice using hydrogen sulfide, a toxic gas.Safar Research also pioneered modern CPR (cardio-pulmonary resuscitation) techniques.The breakthrough was achieved when the laboratory of Mark Roth placed mice in a chamber containing 80 ppm hydrogen sulfide, and the test was conducted for 6 hours