Evaluating the Effectiveness of Pretreatment With Intravenous Fluid in Reducing the Risk of Developing Contrast-Induced Nephropathy: A Systematic Review and Meta-Analysis

The Effect of Perioperative Fluid Therapy on Postoperative Renal Functions in Patients Receiving Liver Transplantation from Living Donors: A Retrospective Observational Study

Background

Perioperative fluid management (PFM) is critical in liver transplantation, especially regarding its impact on postoperative renal function. Acute kidney injury (AKI) is a common complication in liver transplant recipients, often influenced by the type and volume of fluids administered during the perioperative period. This study investigates the effects of different fluid management strategies on renal outcomes following liver transplantation from living donors.

Patients and methods

This retrospective observational study included 91 liver transplant recipients who were categorized into three groups based on their PFM strategy: restrictive (n = 1), moderate (n = 34), and liberal (n = 56). Data were collected from patient medical records, focusing on fluid types, peak serum creatinine levels, urine output, and length of hospital stay. Statistical analyses, including ANOVA and logistic regression, were conducted to assess renal outcomes among the groups.

Results

The moderate fluid management group demonstrated the best renal outcomes, with the lowest peak serum creatinine (1.02 ± 0.25 mg/dL) and shorter ICU stays (2.47 ± 0.62 days) compared to the liberal fluid strategy group (1.40 ± 0.92 mg/dL and 2.88 ± 0.83 days, respectively). Moreover, liberal fluid strategies were associated with fluid overload and increased peak serum creatinine levels. Intraoperative fluid administration showed a greater protective effect on renal function compared to postoperative fluid administration.

Conclusions

Moderate PFM, particularly with careful intraoperative fluid administration, is optimal for minimizing the risk of AKI and improving renal outcomes in liver transplant patients. These findings emphasize the importance of individualized fluid therapy in reducing renal complications after liver transplantation.

How to cite this article

Kızılcık N. The Effect of Perioperative Fluid Therapy on Postoperative Renal Functions in Patients Receiving Liver Transplantation from Living Donors: A Retrospective Observational Study. Indian J Crit Care Med 2025;29(3):251-261.

Current updates in radiocontrast-associated acute kidney injury

Contrast-associated acute kidney injury (CA-AKI) is an abrupt decline in kidney function occurring after a recent exposure to iodinated radiocontrast media. CA-AKI presents as elevated serum creatinine level or decreased urine output. CA-AKI is the third leading cause of inpatient AKI. The incidence of CA-AKI varies according to patient population characteristics, ranging from 5% in the general population to as high as 30% in special populations with preexisting comorbidities such as diabetes mellitus, cardiovascular disease, and chronic kidney disease. The development of CA-AKI places a heavy toll on patients and the healthcare system secondary to increased patient morbidity, mortality, hospital length of stay, readmission risk, and healthcare cost. Patients undergoing cardiac catheterization are of special interest, since they have higher risk of developing CA-AKI and its associated complications. The recognition, prevention, and management of CA-AKI has improved over the past few years with the introduction of fluid management guidelines, using less nephrotoxic radiocontrast media, and preprocedural CA-AKI risk assessment. Future advancements in patients' CA-AKI risk stratification and early detection will facilitate prompt initiation of mitigation treatment plans and decrease associated complications.

Reviving the Critically Ill: Exploring Effective Fluid Resuscitation Approaches for Diverse Hypovolemic Shock Cases-A Systematic Review and Meta-Analysis

Objective

The present study was performed to investigate the efficacy of different resuscitation fluids in critically ill patients presenting any type of hypovolemic shock.

Methods

We comprehensively searched PubMed, Web of Science, ScienceDirect, Cochrane Library, and Google Scholar for randomized trials published in English from January 1990 to August 2023. The risk of bias and methodological quality assessment was performed using Cochrane's risk of bias tool embedded within the Review Manager software (RevMan 5.4.1). Moreover, this software was used to perform all the statistical analyses in the present study. During these analyses, the random effects model and 95% confidence interval was employed. The overall effect sizes for continuous and dichotomous data were calculated using the Mean Difference (MD) and Risk ratio (RR), respectively.

Results

Our initial database search resulted in 4768 articles, of which only 16 were reviewed and analyzed. A subgroup analysis of data from 4 of these studies showed that hydroxyethyl starches (HES), gelatins and albumins had no significant mortality benefit compared to crystalloids (RR: 0.94; 95% CI: 0.75-1.17; P=0.58, RR: 0.71; 95% 0.46-1.08; P=0.11 and RR: 1.05; 95% CI: 0.77-1.43; P=0.77, respectively). Similarly, a subgroup analysis of data from 9 studies showed that hypertonic saline plus dextran (HSD) had no significant mortality benefit over normal saline (RR: 0.84; 95% CI: 0.62-1.13; P=0.24) or Lactated ringer's solution (RR: 1.03; 95% CI: 0.75-1.42; P=0.87). In addition, we found that hypertonic saline had a similar effect on the overall mortality as isotonic crystalloids (RR: 0.92; 95% CI: 0.68-1.25; P=0.60). Also, our analysis shows that modified fluid gelatins had a similar mortality effect as HES ((RR: 1.02; 95% CI: 0.52-2.02; P=0.95).

Conclusion

Colloids, whether individually or in hypertonic crystalloids (HSD), had no mortality benefit over crystalloids in adult patients with hypovolemic shock.

Rosiglitazone Alleviates Contrast-Induced Acute Kidney Injury in Rats via the PPARγ/NLRP3 Signaling Pathway

Background

This study investigated the effect and mechanism of rosiglitazone on a rat model with contrast-induced acute kidney injury (CI-AKI).

Materials and Methods

The CI-AKI rat model was established from Sprague Dawley rats by furosemide injection (10 ml/kg) to the caudal vein followed by iohexol (11.7 ml/kg). The experimental grouping was randomly allocated into control, model, rosiglitazone, and T0070907 groups. Blood samples were collected from the abdominal aorta. Serum creatinine, urea nitrogen, MDA, and SOD contents were detected by biochemical analysis. TNF-α and IL-10 expression was detected by ELISA. Urine creatinine and urine protein were measured following 24-h urine biochemistry testing. Cell pathology and apoptosis were detected by H&E and TUNEL staining, respectively. PPARγ, NLRP3, eNOS, and caspase-3 mRNA expression were detected by qPCR. Caspase-3 and NLRP3 expression were detected by immunohistochemistry.

Results

The CI-AKI rat model was successfully established because the results showed that compared with control, serum creatinine, urea nitrogen, MDA, SOD, TNF-α, and IL-10, urine creatinine and urine protein levels were significantly increased in the model group, indicating AKI, but was significantly decreased with rosiglitazone treatment, indicating recovery from injury, while opposite results were obtained with SOD. Apoptosis rate was significantly increased in the model group and significantly decreased with rosiglitazone treatment. NLRP3 and eNOS increased significantly in the model group and decreased significantly with rosiglitazone treatment, while opposite results were obtained with PPARγ. NLRP3 and caspase-3 protein expression was significantly increased in the model group and significantly decreased with rosiglitazone treatment.

Conclusion

Rosiglitazone could alleviate acute renal injury in the CI-AKI rat model by regulating the PPARγ/NLRP3 signaling pathway and should be further investigated as a potential treatment in clinical studies.