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Cardiology4353 papers

Acute kidney injury

Last edited: 4/24/2026

Overview

Acute kidney injury (AKI) is characterized by a rapid decline in renal function, often evidenced by changes in serum creatinine levels, urine output, and fractional excretion of sodium. It is a clinically significant condition associated with substantial morbidity and mortality, particularly in critically ill patients, postoperative settings, and those with severe infections or trauma 1 8 16. AKI affects individuals across all age groups but is notably prevalent among older adults, hospitalized patients, and those with pre-existing renal conditions. Early recognition and management are crucial as AKI can lead to prolonged hospital stays, increased healthcare costs, and progression to chronic kidney disease 1 13 20. Understanding and effectively managing AKI is essential for optimizing patient outcomes in day-to-day clinical practice.

Pathophysiology

AKI arises from various etiologies, including ischemic insult, nephrotoxic agents, and hemodynamic alterations, each triggering distinct molecular and cellular pathways. Ischemia-reperfusion injury (IRI) is a prominent mechanism, where initial ischemia leads to cellular stress and mitochondrial dysfunction, activating pathways such as oxidative stress, inflammation, and cell death mechanisms like ferroptosis and apoptosis 7 12 15 22 24 30 38 49. Oxidative stress, mediated by reactive oxygen species (ROS), damages cellular components and activates inflammatory cascades involving cytokines and chemokines, further exacerbating tissue injury 17 21 33 48. Additionally, tubular cell death through pyroptosis and necrosis contributes to the loss of renal function, while extracellular matrix proteins and fibrosis can transition AKI into chronic kidney disease (CKD) 32 35 40 44. These interconnected pathways underscore the complexity of AKI and highlight the need for multifaceted therapeutic approaches.

Epidemiology

The incidence of AKI varies widely depending on the population studied and the diagnostic criteria used. In critically ill patients, the incidence can range from 20% to 50%, with higher rates observed in intensive care units (ICUs) and among patients undergoing major surgeries or suffering from sepsis 1 8 16 55. Age is a significant risk factor, with older adults experiencing higher rates of AKI due to pre-existing comorbidities and reduced physiological reserve 1 13. Geographic variations exist, influenced by healthcare infrastructure, access to nephrotoxic agents, and environmental factors. Trends over time show an increasing incidence, partly attributed to aging populations and improved diagnostic capabilities 1 16. Risk factors include pre-existing renal disease, hypertension, diabetes, and exposure to nephrotoxins like certain antibiotics and contrast agents 3 4 11 23.

Clinical Presentation

Clinical presentation of AKI can be subtle initially, often manifesting as oliguria or anuria, alongside nonspecific symptoms such as fatigue, nausea, and confusion. Red-flag features include rapid deterioration in renal function, significant electrolyte imbalances (e.g., hyperkalemia), acid-base disturbances, and fluid overload 1 16. In critically ill patients, AKI may be masked by concurrent multi-organ dysfunction, necessitating vigilant monitoring of renal biomarkers like serum creatinine and urine output 1 16 33. Prompt recognition of these signs is crucial for timely intervention and management.

Diagnosis

The diagnosis of AKI typically involves a combination of clinical assessment and laboratory evaluations. Key diagnostic criteria include:

Serum Creatinine Elevation: Increase of ≥0.3 mg/dL within 24 hours or ≥1.5 times baseline within 7 days 1 16.

Urine Output: Decrease to <0.5 mL/kg/hour for ≥6 hours 1 16.

Fractional Excretion of Sodium (FENA): <1% in patients with adequate urine output, indicating tubular dysfunction 1 16.

Biomarkers: Elevated levels of urinary biomarkers such as neutrophil gelatinase-associated lipocalin (NGAL), liver-type fatty acid-binding protein (L-FABP), and interleukin-18 (IL-18) can aid early detection 11 33 51.

Differential Diagnosis:

Dehydration: Distinguished by history of fluid loss and responsive to fluid resuscitation.

Heart Failure: Presence of cardiomegaly, pulmonary congestion, and response to diuretics.

Pre-renal Azotemia: Often reversible with correction of underlying hypovolemia or obstruction.

Management

Initial Management

Fluid Management: Maintain adequate hydration; use isotonic saline initially, adjusting based on clinical response and monitoring of fluid balance 1 16.

Blood Pressure Control: Target blood pressure to avoid both hypotension and hypertension; typically aim for mean arterial pressure (MAP) 65-75 mmHg 1 16.

Avoid Nephrotoxins: Minimize use of nephrotoxic agents like nonsteroidal anti-inflammatory drugs (NSAIDs) and certain antibiotics 3 4.

Specific Therapies

Dialysis: Initiate renal replacement therapy (RRT) in cases of severe hyperkalemia, acidosis, fluid overload, or worsening metabolic disturbances 1 16.

Inhibition of Ferroptosis and Oxidative Stress:

- Nafamostat Mesylate: Consider for its protective effects against mitochondrial dysfunction and ferroptosis; dose typically 0.05-0.1 mg/kg/hour 49. - Lycopene and Other Antioxidants: Supportive role in reducing oxidative stress; dose varies but often 10-30 mg/day 9 17.

Mitochondrial Support:

- TGR5 Agonists: Potential role in mitigating ferroptosis and oxidative stress; specific dosing varies by study 32. - rhBNP: Promotes selenium recycling and inhibits ferroptosis; dosing studies are ongoing but typically involve intravenous administration 36.

Refractory Cases

Consultation: Early nephrology consultation for complex cases 1 16.

Advanced Therapies: Consider experimental therapies like sequential-targeting nanomedicine or specific inhibitors of ferroptosis pathways under expert guidance 22 44.

Contraindications:

Avoid RRT in stable patients with mild AKI unless specific indications are present.

Use caution with antioxidants in patients with active bleeding or on anticoagulants.

Complications

Acute Complications

Electrolyte Imbalances: Hyperkalemia, hyponatremia; manage with dialysis or specific electrolyte replacement 1 16.

Acid-Base Disorders: Metabolic acidosis; correct with bicarbonate therapy as needed 1 16.

Long-Term Complications

Chronic Kidney Disease (CKD): Progression to CKD, especially in patients with pre-existing renal impairment or severe AKI 13 40.

Cardiovascular Events: Increased risk of heart failure and arrhythmias; monitor closely and manage cardiovascular risk factors 16 26.

Referral Triggers:

Persistent oliguria unresponsive to fluid resuscitation.

Progressive metabolic derangements despite supportive care.

Evidence of CKD progression or recurrent AKI episodes.

Prognosis & Follow-Up

The prognosis of AKI varies widely depending on the severity and underlying etiology. Prognostic indicators include initial creatinine rise, presence of comorbidities, and response to initial management. Patients with mild AKI often recover fully, whereas severe cases may progress to CKD or multi-organ failure 1 16 20. Recommended follow-up intervals include:

Short-Term: Daily monitoring in ICU settings, focusing on renal function and fluid balance.

Long-Term: Regular assessments of serum creatinine, estimated glomerular filtration rate (eGFR), and proteinuria every 3-6 months for at least one year post-AKI 13 33.

Special Populations

Pregnancy

AKI in pregnancy is associated with significant maternal and fetal risks, often linked to preeclampsia or obstetric hemorrhage. Management requires careful monitoring of both mother and fetus, with timely delivery considerations if AKI is severe 16 18.

Pediatrics

Children with AKI often present with dehydration, sepsis, or nephrotoxic drug exposure. Early recognition and supportive care are crucial, with close monitoring of growth parameters post-AKI 33 43.

Elderly

Elderly patients are at higher risk due to comorbidities and reduced renal reserve. Management focuses on minimizing nephrotoxic exposures and vigilant monitoring of fluid and electrolyte balance 1 13.

Comorbidities

Patients with diabetes, hypertension, and cardiovascular disease require tailored management to control underlying conditions, which significantly influence AKI outcomes 1 16 20.

Key Recommendations

Early Recognition and Monitoring: Implement routine monitoring of serum creatinine and urine output in high-risk patients (Evidence: Strong 1 16).

Avoid Nephrotoxins: Minimize exposure to potentially nephrotoxic agents, especially in critically ill patients (Evidence: Strong 3 4).

Fluid Management: Maintain appropriate fluid balance to prevent both hypovolemia and overload (Evidence: Moderate 1 16).

Blood Pressure Control: Target MAP within 65-75 mmHg to optimize renal perfusion (Evidence: Moderate 1 16).

Early Nephrology Consultation: Engage nephrology early in severe or refractory cases (Evidence: Moderate 1 16).

Consider Renal Replacement Therapy: Initiate RRT for severe metabolic disturbances or fluid overload (Evidence: Strong 1 16).

Supportive Therapies: Use antioxidants and ferroptosis inhibitors cautiously based on clinical context (Evidence: Moderate 17 32).

Long-Term Follow-Up: Schedule regular assessments of renal function post-AKI, especially in high-risk groups (Evidence: Moderate 13 33).

Manage Electrolyte Imbalances: Promptly address hyperkalemia and acid-base disturbances (Evidence: Strong 1 16).

Tailored Management for Special Populations: Adapt management strategies for pregnant women, children, and elderly patients (Evidence: Expert opinion 16 18 33).

References

Showing 100 most recent of 1579 indexed papers.

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