The U.S. attorney's office coordinated with the hospital staff when the suspect would be available, since he had earlier been under sedation.

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Patients were under sedation and most of them did not wake up, emergencies official Yuri Deshevykh told Russia's RIA Novosti news agency.

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"We can use this to increase the safety of people who are under sedation after surgery by knowing if they stop breathing, " he says.

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Once selected, the patient is then placed under deeper sedation as the implant is sutured in place.

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It can be corrected with surgery that can be done as a day case, under local anaesthetic and sedation.

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