2 research outputs found
A substudy of a randomized controlled trial
Data on early markers for acute kidney injury (AKI) after noncardiovascular
surgery are still limited. This study aimed to determine the diagnostic value
of plasma neutrophil-gelatinase-associated lipocalin (pNGAL) and
intraoperative diuresis for AKI in patients undergoing major abdominal surgery
treated within a goal-directed hemodynamic algorithm. This study is a post-hoc
analysis of a randomized controlled pilot trial comparing intravenous
solutions within a hemodynamic goal-directed algorithm based on the esophageal
Doppler in patients undergoing epithelial ovarian cancer surgery. The
diagnostic value of plasma NGAL obtained at ICU admission and intraoperative
diuresis was determined with respect to patients already meeting AKI criteria
6 hours after surgery (AKI6h) and to all patients meeting AKI criteria at
least once during the postoperative course (AKItotal). AKI was diagnosed by
the definition of the Kidney Disease Improving Global Outcome (KDIGO) group
creatinine criteria and was screened up to postoperative day 3. Receiver
operating characteristic curves including a gray zone approach were performed.
A total of 48 patients were analyzed. None of the patients had increased
creatinine levels before surgery and 14 patients (29.2%) developed AKI after
surgery. Plasma NGAL was predictive for AKI6h (AUCAKI6h 0.832 (95% confidence
interval [CI], 0.629â0.976), P = .001) and AKItotal (AUCAKItotal 0.710 (CI
0.511â0.878), P = .023). The gray zones of pNGAL calculated for AKI6h and
AKItotal were 210 to 245 and 207 to 274 ng mLâ1, respectively. The lower
cutoffs of the gray zone at 207 and 210 ng mLâ1 had a negative predictive
value (NPV) (i.e., no AKI during the postoperative course) of 96.8% (CI
90â100) and 87.1% (CI 78â97), respectively. Intraoperative diuresis was also
predictive for AKI6h (AUCAKI6h 0.742 (CI 0.581â0.871), P = .019) with a gray
zone of 0.5 to 2.0 mL kgâ1 hâ1. At the lower cutoff of the gray zone at 0.5 mL
kgâ1 hâ1, corresponding to the oliguric threshold, the NPV was 84.2% (78â92).
This study indicates that pNGAL can be used as an early marker to rule out AKI
occurring within 3 days after major abdominal surgery. Intraoperative diuresis
can be used to rule out AKI occurring up to 6 hours after surgery
The value of NGAL-concentration and diuresis to predict postoperative acute kidney injury in non-cardiac surgery using a intraoperative goal-directed hemodynamic algorithm in gynecologic cancer surgery
Hintergrund: Das akute Nierenversagen (ANV) ist eine bedeutende perioperative
Komplikation. Es mangelt jedoch an verlĂ€sslichen PrĂ€diktoren, die eine frĂŒhe
Diagnose ermöglichen. Ziel der Arbeit war die Evaluation des Neutrophilen
Gelatinase-assoziierten Lipocalins (NGAL) und der intraoperativen Diurese zur
Vorhersage des postoperativen ANV. Methoden: Diese Arbeit ist eine post-hoc-
Analyse einer randomisierten kontrollierten klinischen Studie bei 48
Patientinnen mit metastasiertem Ovarial-Karzinom zur Tumor-
Reduktionsoperation, die intraoperativ unterschiedliche Infusionslösungen
innerhalb eines zielgerichteten HĂ€modynamikalgorithmus erhielten. In dieser
Arbeit wurde die intraoperative Diureserate sowie die Plasma-NGAL-
Konzentration im Plasma eine Stunde postoperativ hinsichtlich der
PrĂ€diktivitĂ€t fĂŒr ein ANV sechs Stunden postoperativ (ANV6h) und drei Tage
postoperativ (ANV-POD3) untersucht. Als ANV wurde gemÀà der Acute Kidney
Injury Network (AKIN) Kreatininkriterien das Stadium 1 oder höher definiert.
Zur statistischen Analyse wurden Receiver Operating Characteristic (ROC)
Kurven und Reklassifizierungsmodelle angewendet. Ergebnisse: Bei 29,2 % der
Patientinnen trat ein postoperatives ANV auf. Die intraoperative Diureserate
hatte eine mĂ€Ăige PrĂ€diktivitĂ€t (AUC-ROC6h 0,742 (0,581-0,871, p=0,019) und
die NGAL-Konzentration eine gute PrÀdiktivitÀt (AUC-ROC-6h 0,832
(0,621-0,976), p<0,001) fĂŒr ein ANV bis sechs Stunden postoperativ. Zur
PrÀdiktion des ANV bis zum dritten postoperativen Tag war die intraoperative
Diureserate nicht geeignet (AUC-ROC-POD3 0,661 (0,495-0,808), p=0,081),
wohingegen die NGAL-Konzentration eine moderate PrÀdiktivitÀt zeigte (AUC-ROC-
POD3 0,710 (0,526-0,894), p<0,023). Wurde eine auf der intraoperativen
Diureserate beruhende Risikostratifizierung einem PrĂ€diktionsmodell fĂŒr das
postoperative ANV hinzugefĂŒgt, konnte bezĂŒglich des ANV6h fĂŒr die Nicht-ANV-
Gruppe eine Reklassifizierungsverbesserung erreicht werden (p=0,045), fĂŒr die
ANV-Gruppe jedoch nicht (p=0,115). Durch eine auf der NGAL-Konzentration
beruhenden Risikostratifizierung konnte fĂŒr das ANV6h eine signifikante
Verbesserung der Reklassifizierung sowohl in der ANV-Gruppe (p=0,002) als auch
in der Nicht-ANV-Gruppe (p<0,001) erreicht werden. FĂŒr das ANV-POD3 wurde nur
in der Nicht-ANV-Gruppe eine signifikante Verbesserung der Reklassifizierung
erreicht (p=0,002). Schlussfolgerung: Zur PrÀdiktion des ANV6h war die
intraoperative Diureserate nicht gut geeignet. Die NGAL-Konzentration wies
eine gute PrÀdiktivitÀt auf. Zur PrÀdiktion des ANV-POD3 war die
intraoperative Diureserate ungeeignet. Die NGAL-Konzentration wies hier eine
moderate PrÀdiktivitÀt auf.Background: Acute kidney injury (AKI) is a major complication in postoperative
care. There is a lack of reliable predictors to allow early diagnosis. This
paper aimed to evaluate neutrophil gelatinase-associated lipocalin (NGAL) and
intraoperative diuresis with regarding prediction of postoperative AKI.
Methods: This paper is a retrospective analysis of a randomized controlled
trial in 48 patients. The patients with diagnosis of metastatic ovarian cancer
underwent cytoreductive surgery. Infusion therapy during surgery was goal-
directed. Plasma NGAL and intraoperative diuresis were investigated concerning
their predictive efficiency of AKI six hours after surgery (AKI-6h) and
postoperative day 3 (AKI-POD3). AKI was defined applying creatinine criteria
by Acute Kidney Injury Network (AKIN) stage 1 or higher. Receiver operating
Characteristic (ROC) curves and reclassification models were assessed.
Results: After surgery the incidence of AKI was 29.2 %. Diuresis during
surgery had a moderate predictive value (AUC-ROC-6h 0.742 (0.581-0.871),
p=0.019) and NGAL had a good predictive value (AUC-ROC6h 0.832 (0.621-0.976),
p<0.001) concerning AKI-6h. Diuresis during surgery was not appropriate to
predict AKI up to POD 3 after surgery (AUC-ROC-POD3 0.661 (0.495-0.808),
p=0.081) but NGAL was (AUC-ROC-POD3 0.710 (0.526-0.894), p<0.023). Adding risk
stratification based upon intraoperative diuresis to a risk prediction model
could achieve an improved reclassification for AKI6h in non AKI group
(p=0.045) but not in AKI group (p=0.115). Risk stratification for AKI-6h based
upon NGAL could improve reclassification in both AKI group (p=0.002) and non
AKI group (p<0.001). Improvement of reclassification for AKI-POD3 was only
achieved in non AKI group (p=0.002). Conclusions: Diuresis during surgery was
not a good predictor for AKI-6h but NGAL is. To predict AKI-POD3 diuresis is
inappropriate. NGAL is a moderate predictor for AKI-POD3