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Crit Care ; 28(1): 198, 2024 06 11.
Article in English | MEDLINE | ID: mdl-38863072

ABSTRACT

BACKGROUND: Current continuous kidney replacement therapy (CKRT) protocols ignore physiological renal compensation for hypercapnia. This study aimed to explore feasibility, safety, and clinical benefits of pCO2-adapted CKRT for hypercapnic acute respiratory distress syndrome (ARDS) patients with indication for CKRT. METHODS: We enrolled mechanically ventilated hypercapnic ARDS patients (pCO2 > 7.33 kPa) receiving regional citrate anticoagulation (RCA) based CKRT in a prospective, randomized-controlled pilot-study across five intensive care units at the Charité-Universitätsmedizin Berlin, Germany. Patients were randomly assigned 1:1 to the control group with bicarbonate targeted to 24 mmol/l or pCO2-adapted-CKRT with target bicarbonate corresponding to physiological renal compensation. Study duration was six days. Primary outcome was bicarbonate after 72 h. Secondary endpoints included safety and clinical endpoints. Endpoints were assessed in all patients receiving treatment. RESULTS: From September 2021 to May 2023 40 patients (80% male) were enrolled. 19 patients were randomized to the control group, 21 patients were randomized to pCO2-adapted-CKRT. Five patients were excluded before receiving treatment: three in the control group (consent withdrawal, lack of inclusion criteria fulfillment (n = 2)) and two in the intervention group (lack of inclusion criteria fulfillment, sudden unexpected death) and were therefore not included in the analysis. Median plasma bicarbonate 72 h after randomization was significantly higher in the intervention group (30.70 mmol/l (IQR 29.48; 31.93)) than in the control group (26.40 mmol/l (IQR 25.63; 26.88); p < 0.0001). More patients in the intervention group received lung protective ventilation defined as tidal volume < 8 ml/kg predicted body weight. Thirty-day mortality was 10/16 (63%) in the control group vs. 8/19 (42%) in the intervention group (p = 0.26). CONCLUSION: Tailoring CKRT to physiological renal compensation of respiratory acidosis appears feasible and safe with the potential to improve patient care in hypercapnic ARDS. TRIAL REGISTRATION: The trial was registered in the German Clinical Trials Register (DRKS00026177) on September 9, 2021 and is now closed.


Subject(s)
Carbon Dioxide , Hypercapnia , Renal Replacement Therapy , Respiratory Distress Syndrome , Humans , Male , Female , Pilot Projects , Middle Aged , Hypercapnia/therapy , Hypercapnia/drug therapy , Aged , Carbon Dioxide/blood , Carbon Dioxide/analysis , Carbon Dioxide/therapeutic use , Respiratory Distress Syndrome/therapy , Respiratory Distress Syndrome/drug therapy , Prospective Studies , Renal Replacement Therapy/methods , Renal Replacement Therapy/statistics & numerical data , Intensive Care Units/organization & administration , Intensive Care Units/statistics & numerical data , Respiration, Artificial/methods , Respiration, Artificial/statistics & numerical data , Continuous Renal Replacement Therapy/methods , Continuous Renal Replacement Therapy/statistics & numerical data
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