Name: acute kidney injury: signs and stages
Uploaded: 2025-06-19T09:31:04.000Z
Duration: 1 min 22 s
Channel: JoVE

Acute Kidney Injury or AKI is a rapid decline in kidney function that develops over hours to days. Common causes include dehydration, sepsis, or exposure to nephrotoxic substances.AKI is classified using the RIFLE system, comprising three severity stages: Risk, Injury, and Failure, followed by two outcome stages: Loss and End-Stage Kidney Disease or ESKD.The first stage, Risk, is marked by a one-and-a-half-times increase in serum creatinine or a 25% decrease in the glomerular filtration rate, or GFR.The next stage, Injury, involves a 2 times increase in serum creatinine or a 50% GFR reduction.The third stage, Failure, involves a 3 times increase in serum creatinine or a GFR reduction of more than 75%.The final stages, Loss and ESKD, describe irreversible damage.Loss refers to a sustained loss of kidney function for more than four weeks, while ESKD indicates complete kidney failure that persists for more than three months and may require dialysis or transplantation for survival.

acute kidney injury i: introduction

Acute Kidney Injury I: Introduction

<h4>Introduction:</h4>Acute Kidney Injury (AKI) describes a swift decrease in kidney function occurring over hours to days, characterized by the kidneys' failure to remove waste products from the bloodstream. This leads to dangerous complications like metabolic acidosis, fluid overload, and electrolyte imbalances, such as hyperkalemia, which can cause life-threatening arrhythmias. AKI is common in both hospital and outpatient settings, often triggered by dehydration, sepsis, or exposure to nephrotoxic drugs like NSAIDs and contrast agents&#8203;.<h4>Definition:</h4>Acute Kidney Injury (AKI) is identified by either an increase of 0.3 mg/dL or more in serum creatinine within 48 hours or a 1.5-fold rise in baseline creatinine over seven days. A reduced urine output, less than 0.5 mL/kg/hour for six hours, is also a key diagnostic marker&#8203;. Though potentially reversible, AKI has a high mortality rate, especially in hospitalized patients. Classification:The RIFLE classification system is used to assess the severity of AKI and guide treatment. RIFLE stands for Risk, Injury, Failure, Loss, and End-Stage Kidney Disease (ESKD). It has three severity stages followed by two outcome stages&#8203;.<ol><li>Risk:<ul><li>It is characterized by a 1.5 times rise in serum creatinine levels or a 25% drop in glomerular filtration rate (GFR). Additionally, for six hours, urine output can decrease to less than 0.5 mL/kg/hour.</li></ul></li><li>Injury:<ul><li>This stage involves doubling serum creatinine or a 50% reduction in GFR. Urine output is often below 0.5 mL/kg/hour for 12 hours, with rising BUN and serum creatinine&#8203;.</li></ul></li><li>Failure:<ul><li>It is defined by a threefold rise in serum creatinine or a decrease in GFR of over 75%. Urine output may be less than 0.3 mL/kg/hour for 24 hours, or there may be no urine (anuria) for 12 hours&#8203;.</li></ul></li></ol><h4>Outcome Stages:</h4><ol><li>Loss:<ul><li>Refers to complete loss of kidney function for more than four weeks, often requiring renal replacement therapy (RRT)&#8203;.</li></ul></li><li>End-Stage Kidney Disease (ESKD):<ul><li>It occurs when kidney failure persists for more than three months, requiring long-term dialysis or kidney transplantation&#8203;.</li></ul></li></ol>AKI, if untreated, can lead to chronic kidney disease (CKD) or ESKD. Early detection using the RIFLE system is crucial to improving patient outcomes&#8203;.

Introduction:Acute Kidney Injury (AKI) describes a swift decrease in kidney function occurring over hours to days, characterized by the kidneys' failure ...

Education

JoVE Core

Medical-Surgical Nursing

Unit 1

Management of Patients with Kidney Disorders

management-of-patients-with-kidney-disorders

KEY TERMS AND CONCEPTS

acute kidney injury: signs and stages

Acute Kidney Injury (AKI) is a sudden drop in kidney function that happens over hours to days. The kidneys cannot remove waste products from the blood as well as they should. This can cause metabolic acidosis, fluid overload, and electrolyte problems such as hyperkalemia. High potassium can lead to life-threatening heart rhythm changes.

AKI is seen in both hospitals and outpatient settings. It can be caused by dehydration, sepsis, or nephrotoxic drugs, which are drugs that can damage the kidneys. Examples include NSAIDs and contrast agents used in medical imaging.

Doctors identify AKI by changes in creatinine and urine output. Serum creatinine may rise by 0.3 mg/dL or more within 48 hours, or it may increase 1.5 times from the baseline within seven days. Another key sign is urine output below 0.5 mL/kg/hour for six hours. AKI can be reversible, but it has a high death rate, especially in hospitalized patients.

The RIFLE system helps classify AKI and guide treatment. RIFLE stands for Risk, Injury, Failure, Loss, and End-Stage Kidney Disease, or ESKD. The first three are severity stages, and the last two are outcome stages. Early detection with RIFLE can improve patient outcomes and help prevent progression to chronic kidney disease, or CKD, and ESKD.

Risk is the first stage. It is defined by a 1.5 times rise in serum creatinine or a 25% drop in glomerular filtration rate, or GFR. Urine output may also fall below 0.5 mL/kg/hour for six hours.

Injury is more severe. It involves doubling of serum creatinine or a 50% reduction in GFR. Urine output is often below 0.5 mL/kg/hour for 12 hours, and blood urea nitrogen, or BUN, and serum creatinine rise.

Failure is the most severe stage in the RIFLE set before the outcome stages. It is defined by a threefold rise in serum creatinine or a drop in GFR greater than 75%. Urine output may be less than 0.3 mL/kg/hour for 24 hours, or there may be no urine, called anuria, for 12 hours.

Loss means kidney function is completely lost for more than four weeks. People at this stage often need renal replacement therapy, or RRT. ESKD means kidney failure lasts more than three months. It usually requires long-term dialysis or kidney transplantation.

Acute Kidney Injury: Signs and Stages

Acute Kidney Injury (AKI) is a sudden drop in kidney function that happens over hours to days. The kidneys cannot remove waste products from the blood as well as they should. This can cause metabolic acidosis, fluid overload, and electrolyte problems such as hyperkalemia. High potassium can lead to life-threatening heart rhythm changes. AKI is seen in both hospitals and outpatient settings. It can be caused by dehydration, sepsis, or nephrotoxic drugs, which are drugs that can damage the...

acute kidney injury ii: pathophysiology

Acute Kidney Injury: Causes and Kidney Damage

Acute kidney injury (AKI) can be grouped by where the problem starts in the kidney system. The three main categories are prerenal, intrarenal, and postrenal causes. This breakdown helps explain how kidney function is disrupted and supports clinical decision-making. Prerenal acute kidney injury is the most common type. It happens when blood flow to the kidneys drops, so filtration falls even though the kidney tissue itself is not directly damaged. Common causes include hypovolemia from...

acute kidney injury iii: clinical manifestations

acute-kidney-injury-iii-clinical-manifestations

Acute Kidney Injury: Stage Changes and Symptoms

Acute kidney injury (AKI) changes through three clinical stages: oliguric, diuretic, and recovery. Each stage has its own signs and care needs. The main pattern is a shift from low urine output to high urine output and then gradual healing. The oliguric phase is the first stage and usually lasts 10 to 14 days. Urine output drops to less than 400 mL per day, which shows that the kidneys are not working well. Fluid builds up in the body and can cause edema, high blood pressure, and distended...

acute kidney injury iv: diagnostic studies and prevention

acute-kidney-injury-iv-diagnostic-studies-and-prevention

Acute Kidney Injury IV: Testing and Prevention

Acute kidney injury (AKI) requires early testing and prevention to reduce kidney damage. AKI is linked to high mortality, with reported rates ranging from 10% to 80%. Careful monitoring helps identify at-risk patients before the injury becomes severe. Diagnosis starts with a detailed medical history. Clinicians look for prerenal causes, intrarenal causes, and postrenal causes. Prerenal AKI may follow dehydration, low blood pressure, or blood loss. Intrarenal AKI can result from nephrotoxic...

acute kidney injury v: interprofessional care

acute-kidney-injury-v-interprofessional-care

Managing Fluid, Potassium in Acute Kidney Injury

Acute kidney injury requires close care to manage fluid balance, potassium levels, medicines, dialysis, and nutrition. The goal is to support kidney recovery and prevent complications. Nurses and other clinicians often work together to watch for early changes and respond quickly. Fluid monitoring is a major part of care. Body weight, central venous pressure, and urine output are checked regularly. Intake and output are recorded to help prevent fluid overload, which can lead to pulmonary edema...

acute kidney injury vi: nursing management

acute-kidney-injury-vi-nursing-management

Acute Kidney Injury VI: Fluid Balance Care

Acute kidney injury can make it hard to keep fluid, electrolyte, and acid-base balance in range. Nursing care focuses on careful assessment and targeted actions to improve patient outcomes. A complete patient history is the first step. Nurses should ask about recent infections, nephrotoxic medications, and chronic conditions such as hypertension and diabetes that may contribute to acute kidney injury. The physical exam should look for fluid overload. Key signs include oliguria, which means...

chronic kidney disease i: introduction

Chronic Kidney Disease: Causes and Progression

Chronic kidney disease (CKD) develops when the kidneys slowly lose their ability to work. As the disease advances, it can lead to end-stage renal disease. At that point, the kidneys can no longer filter wastes or help maintain essential body functions, so survival depends on renal replacement therapy, such as dialysis or a kidney transplant. Early CKD can be hard to detect. Healthy nephrons, the kidney’s filtering units, often make up for damaged ones at first. This compensation can hide the...

chronic kidney disease ii: clinical manifestations

chronic-kidney-disease-ii-clinical-manifestations

Chronic Kidney Disease: Body System Effects

Chronic kidney disease affects many body systems as uremic toxins build up and disrupt normal cell function. As the kidneys lose filtering ability, symptoms can appear in the brain, skin, heart, lungs, digestive tract, blood, bones, and reproductive system. These changes often develop gradually, but they can become serious as the disease advances. Neurologic symptoms often appear early. People may feel tired, have headaches, feel confused, or have trouble concentrating. In severe cases,...

chronic kidney disease iii: interprofessional care

chronic-kidney-disease-iii-interprofessional-care

Chronic Kidney Disease: Testing, Diet, and Dialysis

Chronic kidney disease (CKD) is managed through testing, medicine, diet, and dialysis. It can progress through stages and may lead to end-stage kidney disease (ESKD) if it is not treated. Care often depends on teamwork among health professionals, and patient education helps people manage the condition and protect quality of life. Doctors often track CKD by checking glomerular filtration rate, or GFR, which shows how well the kidneys filter blood. They also monitor serum creatinine and blood...

chronic kidney disease iv: nursing management

chronic-kidney-disease-iv-nursing-management

CKD Nursing Care: Assessment to Follow-Up

Chronic kidney disease nursing care focuses on assessment, monitoring, and follow-up to help prevent complications and keep patients stable. Nurses use a structured approach to slow CKD progression and support quality of life. Care starts with a full patient assessment. Nurses review medical history and look for risk factors such as diabetes, hypertension, and nephrotoxic drug use, which are medicines that can harm the kidneys. They also check for fluid retention, including peripheral edema,...

key terms and concepts

Learn how acute kidney injury affects kidney function, how it is detected, and how the RIFLE stages track severity from Risk to ESKD.

Acute Kidney Injury: Signs and Stages | JoVE K12

JoVE Core Medical-Surgical Nursing offers comprehensive animated lessons that cover major systems of the human body, integrating anatomy and physiology with system-specific assessments. This collection encompasses disease conditions based on the body systems, detailing their pathophysiology, medical and surgical management, and nursing interventions. These lessons provide a clear and practical understanding of medical-surgical care, equipping students with essential skills for managing patient care in various clinical settings.

Acute Kidney Injury: Signs and Stages

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