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      Measurement of vascular access recirculation unaffected by cardiopulmonary recirculation: evaluation of an ultrasound method.

      1 , , , ,
      Nephron
      S. Karger AG

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          Abstract

          Recently developed devices provide detection of access recirculation (AR) and cardiopulmonary recirculation (CPR) by optical, thermal, conducimetrical, and ultrasound methods (USM). We evaluated the last one both in vitro reproducing AR by a bypass pump and in vivo. In vitro, the USM sensitivity was about 5%. In vivo, the USM was compared with the traditional urea method (UM) in 69 patients. 8.7% of the cases resulted positive by both UM and USM. One case was USM positive and UM negative. The UM sensitivity threshold was 6-10%. The accuracy (in vitro) and the repeatability (in vivo) of the USM were satisfactory. USM clearly distinguished AR from CPR. In conclusion, AR determination by USM, avoiding misleading interferences with CPR, is a rapid, easy, and noninvasive method to routinely exclude a potential cause of reduced dialytic efficiency.

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          Author and article information

          Journal
          Nephron
          Nephron
          S. Karger AG
          1660-8151
          1660-8151
          Jan 1999
          : 81
          : 1
          Affiliations
          [1 ] Nephrology and Dialysis Unit, Aosta General Hospital, Aosta, Italy.
          Article
          45241
          10.1159/000045241
          9884415
          9dcc9c64-dc8f-4ba2-a99a-f3c4688afffe
          History

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