Transcranial Doppler ultrasound assessment of intracranial hemodynamics in children with diabetic ketoacidosis. 
The pathophysiology of acute neurological complications of diabetic ketoacidosis (DKA) in children and adolescents is not completely understood.  We sought to establish whether transcranial Doppler (TCD) was able to monitor the changes of cerebral blood flow regulatory mechanisms, as measured by cerebral blood velocities (CBF-V), Gosling's pulsatility index (PI), and cerebral vascular reactivity (VR), prior to and during treatment of DKA.  The increased values of PI suggested an increase of intracranial pressure (ICP) due to the existence of cerebral vasoparalysis, based on the low values of VR prior to treatment and 6 hours after initiation of treatment.  At 24 hours, the correction of hematocrit and pH was associated with a significant decrease of PI, suggesting a decrease of ICP, likely due to a return of vascular tone in response to the low PaCO2.  This was further supported by an increase of VR in all patients.  At 48 hours, when PaCO2 returned to normal, the PI remained low and the VR increased further, suggesting a complete reversal of vasoparalysis and a return of cerebral blood flow regulatory mechanisms.