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1, strict implementation of aseptic operation: mis-insertion or prolapse immediately replace 2. control urinary retention patients urinary rate and amount: do not fast, put 600-800ml pinch tube 3. observe the nature of urine color
(1) normal: 1500-2000ml /24h polyuria>2500ml/24h oliguria <400ml/24h no <50ml/24h
(2) Color: normal colorless transparent or light yellow, abnormal: hematuria, hemoglobinuria, bilirubinuria
(3) Properly fix the urinary catheter, keep the pipeline normally, check and adjust the position of the urethral tube when clogging, and wash it with repeated washing with furancilin if necessary.