Patient prepared for and consented to have transesophageal echocardiography (tee).Tee probe was inserted by fellow doctor with assistance from a second doctor.When the probe was inserted, no images were showing on the screen.The tee probe was found to be disconnected by registered diagnostic medical sonographer.Probe was not locked into machine due to possible lock malfunction.Tee probe was immediately extubated and switched out for extra probe in unit.Patient was reintubated and the tee successfully performed.
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