ABSTRACT
Acute confusional states (delirium) occur in up to 80% of patients in the intensive care unit. Delirium is an important independent prognostic determinant of hospital outcome, including duration of mechanical ventilation, nursing home placement, functional decline and death. Additionally, it may herald systemic diseases such as sepsis and multi-organ failure. Recently, a number of new screening instruments have been validated for the monitoring of delirium in non-communicative patients receiving mechanical ventilation. Critical care patients should be routinely assessed for delirium and treated immediately using available preventive and therapeutic measures, both pharmacological and non-pharmacological, to improve the clinical course.
Subject(s)
Critical Illness/psychology , Delirium/therapy , Postoperative Complications/therapy , Acute Disease , Critical Care , Delirium/epidemiology , Delirium/etiology , Delirium/physiopathology , Delirium/psychology , Humans , Neurotransmitter Agents/physiology , Postoperative Complications/etiology , Postoperative Complications/psychology , Psychiatric Status Rating Scales , Risk Factors , Sepsis/complications , Stress, Psychological/complications , Stress, Psychological/physiopathology , Treatment OutcomeABSTRACT
The widespread use of neuraxial anaesthesia increases the need for animal models to evaluate therapeutic prospects, mechanisms and risks of this technique. As a methodological prerequisite, we characterised the sympathetic blockade after different modes of neuraxial anaesthesia with regard to segments supplying the splanchnic region. Under haemodynamic monitoring, lidocaine 2% or saline were infused via intrathecal (10 microl), lumbar epidural (10 and 30 microl) or thoracic epidural (10 and 30 microl) catheters. Segmental spread of neuraxially infused local anaesthetic was assessed using methylene blue. Mean arterial blood pressure decreased more severely after neuraxial lidocaine in thoracic epidural (10 and 30 microl) compared to high-volume (30 microl anaesthesia animals. Determination of the sympathetic blockade by means of laser Doppler perfusion imaging was restricted to the paws due to a higher density of subcutaneous blood vessels as compared to the abdominal wall (mean +/- SD: 3.93 +/- 0.06 vs. 1.35 +/- 0.05/384 mm(2), p < 0.05). Only high-volume (30 microl) lumbar and thoracic epidural anaesthesia (10 and 30 microl) increased skin perfusion in both hind and front paws. This extensive sympathetic blockade was demonstrated to include splanchnic segments using thermography. Segmental spread of methylene blue did not closely correspond to laser Doppler findings and should be interpreted as minimum rather than exact epidural spread of local anaesthetic.
