What Is Acute Kidney Injury? Causes, Symptoms, And Treatment

Acute Kidney Injury (AKI) is a sudden loss of kidney function that happens over hours or days. Unlike chronic kidney disease, which develops over time, AKI occurs quickly and can be life-threatening if not treated promptly. It is often caused by illness, infections, dehydration, or medication side effects. If detected early, AKI can be reversed, making timely diagnosis and treatment crucial.

What Is Acute Kidney Injury?

Acute Kidney Injury, previously known as acute renal failure, occurs when the kidneys suddenly stop working properly. The kidneys’ primary role is to filter waste and excess fluid from the blood. When they fail to function, waste products build up, leading to serious complications.

AKI is common among hospitalised patients, the elderly, and those with pre-existing kidney conditions. It can range from mild impairment to complete kidney failure, requiring dialysis.

What Causes Acute Kidney Injury?

AKI is typically caused by three main factors:

1. Reduced Blood Flow To The Kidneys – Conditions like low blood pressure, dehydration, heart failure, or blood loss can limit blood supply to the kidneys.
2. Direct Kidney Damage – Infections, toxins, autoimmune diseases, or certain medications (such as nonsteroidal anti-inflammatory drugs (NSAIDs), antibiotics, and contrast dyes) can injure the kidneys.
3. Urinary Blockage – Blocked urine flow due to kidney stones, an enlarged prostate, or tumours can lead to AKI.

Symptoms Of Acute Kidney Injury

AKI can develop suddenly, and symptoms may not always be obvious at first. Some common signs include:

• Decreased urine output or no urination at all
• Swelling in the legs, feet, or face due to fluid retention
• Shortness of breath
• Fatigue or confusion
• Nausea and vomiting
• Loss of appetite
• Irregular heartbeat
• Pain in the lower back or side (if caused by a blockage)

Since symptoms can be subtle or mistaken for other illnesses, it is essential to seek medical attention if you suspect kidney issues.

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Who Is At Risk Of Acute Kidney Injury?

Anyone can develop AKI, but certain groups are more vulnerable, including:

• Elderly individuals (above 65 years old)
• Patients with diabetes or high blood pressure
• People with heart disease or liver disease
• Hospitalised patients, especially those in intensive care
• Individuals taking medications that affect kidney function

How Is Acute Kidney Injury Diagnosed?

Doctors diagnose AKI using:

• Blood Tests – To check creatinine levels (a waste product that builds up when kidneys fail).
• Urine Tests – To detect abnormalities in kidney function.
• Ultrasound Or CT Scans – To look for blockages or structural damage in the kidneys.

Treatment Options For Acute Kidney Injury

Treatment for AKI depends on the underlying cause. In many cases, early intervention can restore kidney function.

• Fluids And Medication – If dehydration or low blood pressure caused the AKI, restoring fluids and adjusting medication can help.
• Treating Infections – Antibiotics may be needed if infections are the cause.
• Managing Underlying Conditions – Controlling blood pressure, diabetes, or heart disease is crucial for kidney recovery.
• Dialysis – In severe cases, temporary dialysis may be required to remove waste and excess fluid from the blood.

How To Prevent Acute Kidney Injury?

• Stay Hydrated – Drink plenty of water, especially in hot weather.
• Monitor Medications – Avoid overuse of painkillers like NSAIDs and inform your doctor about any medications you take.
• Manage Chronic Conditions – Control diabetes, high blood pressure, and heart disease to reduce kidney stress.
• Seek Early Medical Advice – If you experience symptoms of AKI, consult a nephrologist immediately.

Consult A Nephrologist Today

Learn More: How To Find The Best Kidney Specialist In Singapore >>

Acute Kidney Injury is a serious condition, but with early detection and proper treatment, full recovery is possible. If you or a loved one experience symptoms or have risk factors for AKI, consult a nephrologist for expert care. Protect your kidney health—book an appointment today.

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