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Copyright of Hypertonia és Nephrologia is the property of LifeTime Media Kft. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We researched the association between incidence of deep vein thrombosis (DVT) after knee arthroplasty and several intraoperative risk factors: changes of diameter (mm) and flow velocity in posterior tibial vein (PTV) in simulated operative positions; anesthesia duration, and total duration of operative forced positions (min.). Average values of the ranges of PTV diameter were the greatest in simulated position 90°+ (3.9725) with statistical significant difference compared to other three measurements (p<0,05). Average values of the ranges of flow velocity in PTV were the greatest in simulated position "90°+" (1.0000) with statistical significant difference compared to other three measurements (p<0.05). Analysing DVT and non-DVT cases through receiver operating characteristic (ROC) we got critical value of PTV diameter (cut-off: >2.96 mm), critical value for flow velocity (cut-off: ≤11.71 cm/sec), critical value for anestesia duration (cut-off: >185 min), and critical value for total duration of forced position (cut-off: >80 min). The greatest relative risk (RR) for DVT occurence RR=3.789 (p<0.0001) have had the patients with anesthesia duration more than 185 minutes. RR was very high at the patients with forced position duration more than 80 minutes (RR=2.992, p<0.0001). RR was moderately high at the patients with flow velocity in simulated position "90°+" ≤11.71 cm/sec (RR=2.091, p<0.0001). We also noted a signifficant relative risk for vein diameter <2.96 mm in maximal flexion (RR=1.312, p=0.0028). By the direct logistic regression we made model to estimate influence of observed parameters on DVT occurence which precisely classified 83.52% of patients. [ABSTRACT FROM AUTHOR]

Background. Transcranial doppler and transcranial color-coded duplexsonography are noninvasive, without contraindications, and relatively cheap ultrasound diagnostic methods to assess cerebrovascular circulation. Objective of this study was to compare the transcranial doppler and transcranial color-coded duplexsonography data in evaluation of normal haemodynamical parameters. Material and methods. We examined prospectively 52 hemispheres of 26 healthy volunteers without cerebrovascular disease and risk factors (mean age 35,3 yrs. ± 9,6) by transcranial doppler and transcranial color-coded duplexsonography. All subjects had sufficient acoustic temporal bone and there were no haemodynamically significant findings in extracranial carotid arteries. Results. Comparative analysis of intracranial blood velocities evaluated by TCCS and TCD showed that mean values of haemodynamical parameters obtained by TCD were significantly higher (p < 0,05) or at least showed ten dency to be higher (0,05 < p < 0,5). Conclusion. Haemodynamical parameters obtained by TCD and TCCS showed a linear dependence. [ABSTRACT FROM AUTHOR]