Renal diseases in the context of COVID-19

Clinical Management of Kidney Injury Associated with COVID-19 caused by SARS-CoV-2

1. OVERVIEW

Kidney involvement is a frequent systemic complication in patients hospitalized with COVID-19, especially in critically ill patients. Renal manifestations range from mild proteinuria to severe acute kidney failure requiring renal replacement therapy (RRT).

Renal injury during COVID-19 is associated with:

• Increased ICU admission

• Higher ventilator requirement

• Increased mortality

2. PATHOPHYSIOLOGY OF RENAL INJURY

COVID-19 kidney damage is multifactorial:

A. Direct Viral Cytotoxicity

SARS-CoV-2 binds ACE-2 receptors located in:

• Proximal tubular epithelial cells

• Podocytes

Result:→ Tubular necrosis→ Proteinuria→ Hematuria

B. Cytokine-Mediated Injury

Severe inflammatory response causes:

• Endothelial injury

• Capillary leak

• Renal microcirculatory collapse

C. Thrombotic Microangiopathy

COVID-19 is a pro-thrombotic disease:

• Microthrombi in glomeruli

• Renal infarction

D. Hemodynamic Causes

• Septic shock

• Hypovolemia

• Mechanical ventilation effects→ Acute tubular necrosis

E. Drug-Induced Nephrotoxicity

Contributing agents:

• Antivirals

• Antibiotics

• Contrast media

3. INDICATIONS FOR RENAL REPLACEMENT THERAPY (RRT)

Perform dialysis in COVID-19 patients who develop:

Acute Kidney Injury (AKI) with:

1. Life-threatening fluid overload

   • Pulmonary edema

   • Refractory hypoxia

2. Severe electrolyte imbalance

   • Hyperkalemia

   • Hypermagnesemia

3. Severe metabolic acidosis

   • pH < 7.1 not responsive to therapy

4. Uremic complications

   • Encephalopathy

   • Pericarditis

Chronic Kidney Disease (CKD)

• Worsening baseline kidney function

• Inability to maintain metabolic stability

4. MANAGEMENT OF PATIENTS ALREADY ON MAINTENANCE HEMODIALYSIS

Patients on chronic dialysis must continue therapy without interruption.

Key Principles

• Do NOT delay dialysis due to infection status

• Schedule cohort sessions

• Separate COVID and non-COVID dialysis patients

5. DIALYSIS LOCATION AND SETUP

Preferred

Bedside hemodialysis in a dedicated dialysis area within COVID ICU

Alternative (When no dedicated unit exists)

Use:

• Portable dialysis machine

• Reverse osmosis water tank system

High-Volume Demand

If multiple sessions anticipated:

• Leave dialysis machine in isolation zone

• Avoid repeated transport contamination

6. ANTICOAGULATION PROTOCOL DURING DIALYSIS

Standard

Use Heparin infusion when:

• Normal coagulation profile

• No bleeding risk

When Heparin Contraindicated

Use:

• Saline flush dialysis protocol

Indications:

• Active bleeding

• Newly initiated dialysis

• Thrombocytopenia

• Coagulopathy

7. INFECTION PREVENTION DURING DIALYSIS

PPE REQUIREMENTS (Mandatory)

All healthcare workers must wear:

• N95 respirator

• Face shield / goggles

• Fluid-resistant gown

• Double gloves

Applies during:

• Dialysis initiation

• Monitoring

• Disconnection

• Waste disposal

8. EQUIPMENT DISINFECTION

All potentially contaminated items must be disinfected:

High-Touch Surfaces

• Dialysis machine panels

• Tubing holders

• Bed rails

Reusable Equipment

• BP cuffs

• Stethoscopes

• Pumps

Use hospital-grade disinfectant according to protocol.

9. WASTE MANAGEMENT

Treat as infectious biomedical waste:

10. STAFF SAFETY PRINCIPLES

1. Minimize exposure time

2. Avoid circuit disconnections

3. Dedicated dialysis staff team

4. Hand hygiene before and after every patient contact

5. No reuse of disposable dialysis consumables

11. SPECIAL CONSIDERATIONS IN COVID-19 ICU

12. CORE CLINICAL MESSAGE