Predictors of Early Deterioration of Renal Function in Patients Older Than 70 Years Undergoing Valvular Surgery

Authors

  • Ljiljana Ranković-Ničić, MD Clinic for Anesthesia and Intensive Care, Dedinje Cardiovascular Institute, Belgrade, Serbia
  • Dragana Unić-Stojanović, MD, PhD Clinic for Anesthesia and Intensive Care, Dedinje Cardiovascular Institute, Belgrade, Serbia
  • Maja Milošević, MD Cardiology Services, Dedinje Cardiovascular Institute, Belgrade, Serbia
  • Slobodan Mićović, MD, PhD Belgrade University School of Medicine, Belgrade, Serbia
  • Tjaša Ivošević, MD, PhD Belgrade University School of Medicine, Belgrade, Serbia
  • Milica Stojicic, MD Clinic for Anesthesia and Intensive Care, Dedinje Cardiovascular Institute, Belgrade, Serbia
  • Petar Otašević, MD, PhD Cardiology Services, Dedinje Cardiovascular Institute, Belgrade, Serbia

DOI:

https://doi.org/10.1532/hsf.4387

Keywords:

Acute kidney injury, cardiac surgery

Abstract

Background: Cardiac surgery-associated acute kidney injury (CSA-AKI) is the most common clinically important complication in adult patients undergoing open-heart surgery, with an incidence between 8.9% and 39%. Studies have shown that even a slight increase in serum creatinine levels after cardiac surgery significantly affects the mortality and morbidity of these patients.

Aim: This study sought to determine the predictors and incidence of acute kidney injury (AKI) in patients older than 70 years undergoing elective valvular surgery.

Methods: Prospective study included 156 patients scheduled for elective cardiac surgery requiring cardiopulmonary bypass (CPB) at Dedinje Cardiovascular Institute between January and September 2019. Isolated valvular surgery was performed in 87 patients, while the remaining 69 patients underwent combined coronary and valvular surgery. The development and stage of CSA-AKI were diagnosed, according to Kidney Disease Improving Global Outcome (KDIGO) criteria. Predictors and incidence of CSA-AKI development were assessed using univariate binary logistic regression analysis.

Results: The incidence of CSA-AKI was 17.3%. CSA-AKI stage 1 was diagnosed in 25 patients  (16.02%). CSA-AKI stage 2 was noted in one patient (0.64%), as well as stage 3 (0.64%). In six patients (3.85%), renal replacement therapy (RRT) was required. Using univariate binary logistic analysis, the following parameters were identified as predictors for CSA-AKI development: duration of cardiopulmonary bypass (OR 1.01; CI 95% (1.01-1.02); P = .002), duration of aortic clamping (OR 1.02; CI 95% (1.01-1.03); P = .002), lactate levels during the intensive care unit (ICU) stay (OR 1.33; CI 95% (1.04-1.70); P = .026), duration of mechanical ventilation (MV) (OR 1.03; CI 95% (1.1-1.07); P = .014), the use of inotropic drugs (adrenaline, dobutamine) (OR 0.38: CI 95% (0.16-0.9); P = .026; and OR 0.23; CI 95% (0.1-0.56); P = .0019, respectively), and the use of diuretics (OR 0.24; CI95% (0.06-095); P = .041). Using Mann-Whitney U test for independent samples show that the group of patients who developed CSA-AKI had significantly longer duration of hospitalization (Z = -2.751); P = .006), prolonged ICU stay
(Z = -4.160; P < .001), and need for prolonged mechanical ventilation (Z = -4.411; P < .001).

Conclusion: Independent predictors for AKI development after valvular surgery in patients older than 70 years are prolonged mechanical ventilation and increased lactate values, while the use of diuretics after surgery reduces the incidence of AKI. Also, the development of CSA-AKI is associated with prolonged ICU stay and a longer duration of hospitalization.

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Published

2022-03-17

How to Cite

Ranković-Ničić, L., Unić-Stojanović, D., Milošević, M., Mićović, S., Ivošević, T., Stojicic, M., & Otašević, P. (2022). Predictors of Early Deterioration of Renal Function in Patients Older Than 70 Years Undergoing Valvular Surgery. The Heart Surgery Forum, 25(2), E196-E203. https://doi.org/10.1532/hsf.4387

Issue

Vol. 25 No. 2 (2022)

Section

Articles

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