Volatile Organic Compounds in Patients With Acute Kidney Injury and Changes During Dialysis

Objectives: To characterize volatile organic compounds in breath exhaled by ventilated care patients with acute kidney injury and changes over time during dialysis. Design: Prospective observational feasibility study. Setting: Critically ill patients on an ICU in a University Hospital, Germany. Patients: Twenty sedated, intubated, and mechanically ventilated patients with acute kidney injury and indication for dialysis. Interventions: Patients exhalome was evaluated from at least 30 minutes before to 7 hours after beginning of continuous venovenous hemodialysis. Measurements and Main Results: Expired air samples were aspirated from the breathing circuit at 20-minute intervals and analyzed using multicapillary column ion-mobility spectrometry. Volatile organic compound intensities were compared with a ventilated control group with normal renal function. A total of 60 different signals were detected by multicapillary column ion-mobility spectrometry, of which 44 could be identified. Thirty-four volatiles decreased during hemodialysis, whereas 26 remained unaffected. Forty-five signals showed significant higher intensities in patients with acute kidney injury compared with control patients with normal renal function. Among these, 30 decreased significantly during hemodialysis. Volatile cyclohexanol (23 mV; 25–75th, 19–38), 3-hydroxy-2-butanone (16 mV, 9–26), 3-methylbutanal (20 mV; 14–26), and dimer of isoprene (26 mV; 18–32) showed significant higher intensities in acute kidney impairment compared with control group (12 mV; 10–16 and 8 mV; 7–14 and not detectable and 4 mV; 0–6; p

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