Samir G Sakka1, Heiko Koeck, Andreas Meier-Hellmann. 1. Department of Anesthesiology and Intensive Care Medicine, Friedrich-Schiller-University of Jena, Bachstrasse 18, 07740 Jena, Germany. Samir.Sakka@med.uni-jena.de
Abstract
OBJECTIVE: While using a transcutaneous system for assessment of liver function by indocyanine green plasma disappearance rate (ICG-PDR) in critically ill patients, we compared the agreement between ICG-PDR obtained by the recommended standard ICG dosage (0.5 mg/kg) and a reduced dosage (0.25 mg/kg). DESIGN: Clinical study. SETTING:Intensive care unit of a university hospital. PATIENTS: Critically ill patients ( n=16, 5 female, 11 male) who underwent liver function monitoring by ICG-PDR for clinical indication. MEASUREMENTS AND RESULTS: We analyzed 31 pairs of ICG-PDR measurements by applying the recommended dosage (0.5 mg/kg, ICG-PDR(0.5)) and a reduced dosage (0.25 mg/kg, ICG-PDR(0.25)). For each comparative measurement either first 0.5 mg/kg or 0.25 mg/kg of ICG was injected in a random fashion and followed by the corresponding dosage 60 min later. All patients were sedated and mechanically ventilated via a tracheal tube. Each patient was monitored by an ICG finger clip which was connected to a liver function monitoring system (LiMon, Pulsion Medical Systems, Germany). ICG-PDR(0.25) was 2.7-25.0 %/min and ICG-PDR(0.5) 4.5-24.5 %/min, respectively. Linear regression analysis revealed ICG-PDR(0.25)=1.13.ICG-PDR(0.5)-0.66 %/min (r=0.95, p<0.0001) with a mean bias 1.0 %/min (standard deviation 2.5 %/min). The 15 min residual rates were also highly correlated ( r=0.92, p<0.0001) with a mean bias of 0.3%. CONCLUSION: A reduced dosage of ICG (0.25 mg/kg) is sufficiently accurate for transcutaneous measurement of ICG-PDR in critically ill patients.
RCT Entities:
OBJECTIVE: While using a transcutaneous system for assessment of liver function by indocyanine green plasma disappearance rate (ICG-PDR) in critically illpatients, we compared the agreement between ICG-PDR obtained by the recommended standard ICG dosage (0.5 mg/kg) and a reduced dosage (0.25 mg/kg). DESIGN: Clinical study. SETTING: Intensive care unit of a university hospital. PATIENTS: Critically illpatients ( n=16, 5 female, 11 male) who underwent liver function monitoring by ICG-PDR for clinical indication. MEASUREMENTS AND RESULTS: We analyzed 31 pairs of ICG-PDR measurements by applying the recommended dosage (0.5 mg/kg, ICG-PDR(0.5)) and a reduced dosage (0.25 mg/kg, ICG-PDR(0.25)). For each comparative measurement either first 0.5 mg/kg or 0.25 mg/kg of ICG was injected in a random fashion and followed by the corresponding dosage 60 min later. All patients were sedated and mechanically ventilated via a tracheal tube. Each patient was monitored by an ICG finger clip which was connected to a liver function monitoring system (LiMon, Pulsion Medical Systems, Germany). ICG-PDR(0.25) was 2.7-25.0 %/min and ICG-PDR(0.5) 4.5-24.5 %/min, respectively. Linear regression analysis revealed ICG-PDR(0.25)=1.13.ICG-PDR(0.5)-0.66 %/min (r=0.95, p<0.0001) with a mean bias 1.0 %/min (standard deviation 2.5 %/min). The 15 min residual rates were also highly correlated ( r=0.92, p<0.0001) with a mean bias of 0.3%. CONCLUSION: A reduced dosage of ICG (0.25 mg/kg) is sufficiently accurate for transcutaneous measurement of ICG-PDR in critically illpatients.
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