Acute Kidney Injury (AKI) is treated in the UK by identifying the underlying cause while supporting the kidneys to prevent further damage. Treatment focuses on restoring fluid balance, reviewing medications that may be stressing the organs, and monitoring blood chemistry to avoid life-threatening complications.
In the NHS, clinical teams follow a standardised ‘care bundle’ once an AKI e-alert is triggered. This involves a rapid assessment of hydration, blood pressure, and urine output. While mild cases can be managed with oral rehydration and medication adjustments by a GP, more severe cases often require hospitalisation for intravenous (IV) fluids or, in rare instances, specialist renal support. In this article, you will learn how the NHS manages different stages of AKI, the ‘sick day rules’ for medications, and the clinical protocols used to ensure a safe recovery.
What We Will cover in This Article
- The primary goals of AKI treatment in UK clinical practice
- How intravenous (IV) fluids are used to restore kidney perfusion
- The importance of the ‘Medication Review’ and pausing specific drugs
- Managing life-threatening complications like high potassium
- When specialist interventions like dialysis or catheters are needed
- The role of ‘Sick Day Rules’ in preventing future kidney injury
- Clinical evidence and NICE [NG148] standards for AKI care
The Core Principles of AKI Treatment
The treatment of AKI in the UK is built on the principle of ‘supportive care.’ This means that rather than using a single ‘cure’ for the kidneys, doctors focus on creating the ideal environment for the kidney cells to repair themselves. The first priority is always to treat the ‘trigger’ such as an infection (sepsis) or severe dehydration.
Clinicians use a ‘step-by-step’ approach. For patients with Stage 1 (mild) AKI, this may simply involve drinking more water and stopping certain tablets. For those with Stage 2 or 3 (moderate to severe) AKI, treatment is more intensive and usually occurs in a hospital ward where fluid intake and urine output can be measured every hour.
Key Treatment Steps:
- Fluid Resuscitation: Giving IV fluids if the patient is dehydrated or has low blood pressure.
- Treating Infection: Using antibiotics if sepsis or a urinary tract infection is the cause.
- Relieving Obstructions: Using a catheter if a blockage (like an enlarged prostate) is preventing urine flow.
- Regular Monitoring: Performing daily blood tests to check creatinine and salt levels.
Medication Reviews and ‘Sick Day Rules’
A critical part of UK treatment is the immediate review of all current medications. Some drugs, while beneficial for long-term health, can put extra pressure on the kidneys during an acute illness. These are often referred to as ‘nephrotoxic’ medications.
GPs and hospital doctors use ‘Sick Day Rules’ to advise patients which tablets to pause until their kidney function returns to its healthy baseline. This is one of the most effective ways to stop a mild injury from becoming a severe one.
| Medication Group | Examples | Action During AKI |
| NSAIDs (Painkillers) | Ibuprofen, Naproxen | Stop immediately; these restrict kidney blood flow. |
| ACE Inhibitors | Ramipril, Lisinopril | Pause temporarily; these affect internal kidney pressure. |
| Diuretics (Water Pills) | Furosemide, Bumetanide | Pause if dehydrated; these can worsen fluid loss. |
| Metformin | Diabetes medication | Pause temporarily; it can build up to toxic levels in AKI. |
Managing Emergency Complications
When AKI is severe, the kidneys can no longer balance the body’s chemistry. The most dangerous complication is hyperkalaemia (high potassium), which can affect the heart’s rhythm. In the UK, if potassium levels rise above 6.0 mmol/L, emergency treatment is started immediately.
Treatment for high potassium involves medications that ‘shift’ potassium back into the cells or help the body excrete it. Additionally, if fluid builds up in the lungs (pulmonary oedema), doctors may use specialised medications or, in extreme cases, emergency dialysis (renal replacement therapy) to physically filter the blood.
Emergency Interventions:
- Calcium Gluconate: An IV medication used to protect the heart from high potassium.
- Insulin/Glucose Drip: Used to rapidly lower potassium levels in the blood.
- Emergency Dialysis: Used for only about 1% of AKI cases when the kidneys are unable to respond to other treatments.
To Summarise
Treatment for AKI in the UK focuses on identifying the cause, restoring fluid levels, and protecting the kidneys by pausing certain medications. Most people make a full recovery with supportive care such as IV fluids and close monitoring of their blood chemistry. While the majority of cases are managed with these simple steps, the NHS has robust protocols in place for emergency complications like high potassium to ensure patient safety at every stage.
If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Will I always need to stay in hospital for AKI?
Not necessarily; mild cases (Stage 1) can often be managed by a GP with close monitoring and a review of your tablets.
How long do I need to stop my blood pressure pills?
You should only restart ‘paused’ medications once your GP or consultant confirms your kidney function has returned to its normal baseline.
Can drinking too much water be bad for AKI?
Yes; if your kidneys aren’t producing urine, drinking too much can lead to fluid overload in the lungs, which is why doctors track your ‘fluid balance’ so carefully.
Is dialysis permanent if I need it for AKI?
No; in the context of AKI, dialysis is usually a temporary measure to keep you safe while your kidneys heal.
Why did the doctor check my heart rhythm (ECG)?
This is done to check if high potassium levels are affecting your heart, which is a common but serious complication of kidney injury.
What are ‘Sick Day Rules’?
These are specific instructions on which medications to pause when you are unwell with a fever, vomiting, or diarrhoea to protect your kidneys.
Authority Snapshot
This article was written by Dr. Rebecca Fernandez, a UK-trained physician with an MBBS and extensive experience in internal medicine, emergency care, and intensive care. It was reviewed by the MyPatientAdvice clinical team to ensure it follows the latest NHS and NICE [NG148] guidelines on the management of acute kidney injury. Our goal is to provide the public with clear, factual, and medically safe information to help them understand the clinical steps taken to treat and protect their kidneys in the UK.
