Incidence of malposition of polyvinylchloride and red rubber left-sided double-lumen tubes and clinical sequelae.

Currently, fiberoptic bronchoscopy (FB) is recommended for correct positioning of double-lumen endobronchial tubes (DLTs) because of the high incidence of malpositions not appreciated by clinical signs. The aims of this study were to assess whether clinical signs allow accurate confirmation of adequate positioning with left red rubber (RR) or polyvinyl-chloride (PVC) double-lumen tubes and to compare the incidence of malpositions between the two tubes. Another goal was to assess whether these malpositions, not appreciated by clinical assessment, adversely affected outcome.

Dose-response effect of intrathecal alfentanil on canine lower urinary tract dynamics.

The effect of intrathecal (IT) administration of three different doses (1, 2.5, and 5 micrograms/kg) of alfentanil on lower urinary tract dynamics was examined by urodynamic studies, cystometrograms (CMG), and urethral pressure profiles (UPP) in seven anesthetized dogs. Simultaneous serum drug concentrations were determined by specific radioimmunoassay for time-response analysis.