Causes and Risk Factors of Acute Renal Failure

Acute renal (kidney) failure can be caused by a variety of medical conditions that damage the kidneys. The kidneys may rapidly fail if they are directly damaged by drugs or other toxins, if they are deprived of blood and oxygen, or if they are severely harmed by an illness.

Common Causes

Usually, the kidneys can continue to function well, even when you become sick. Acute kidney failure is a consequence of severe and rapid damage to the kidneys. It may be reversible or it could be permanent, resulting in lasting kidney dysfunction.

Toxins

Medications contain components that must pass through the kidneys as they are processed in the body. Some of these chemicals can induce toxic damage to the kidneys, causing them to fail.

Medical treatments that are associated with kidney failure include:

• Contrast used for imaging studies, such as CT scans and MRI scans
• Antibiotics, such as aminoglycosides (streptomycin, gentamycin, and amikacin) and vancomycin
• ACE Inhibitors, such as Lotensin (benazepril) and Prinivil (lisinopril)
• Nonsteroidal anti-inflammatories drugs (NSAIDs), such as Motrin, Advil (ibuprofen), Aleve, and Naprosyn (naproxen)
• Zyloprim and Aloprim (allopurinol)
• Lasix (furosemide)
• Proton pump inhibitors, such as Prilosec (omeprazole), Nexium (esomeprazole magnesium), or Prevacid (lansoprazole)

Sometimes the cause of acute renal failure is obvious if a medication was administered in a hospital setting. If you took medication at home and forgot about it, it may be more difficult to identify the cause of your acute renal failure.

Shock

Shock is a life-threatening condition that causes severe disruption of the body's functions, and it often causes substantial damage to multiple organs.

These conditions cause the blood pressure or blood supply to fall below the threshold required for sustainable kidney function and can cause sudden damage to the kidneys. 

Sepsis

Sepsis is a severe physical response that is often associated with septicemia (an infection that involves the blood). These conditions can cause acute renal failure as a result of shock and/or the spread of infection to the kidneys. 

Post Surgery

Acute renal failure can develop in the first few days after surgery. 

Risk factors that increase the chances of acute renal failure after surgery include:

• Age: Advancing age is more often associated with acute renal failure after surgery than young age, particularly for people who already have kidney disease. 
• Diminished kidney function prior to surgery: A person who already has diminished kidney function is more likely to experience acute renal failure after surgery than someone who does not have kidney problems. 
• Other medical conditions: If you have high blood pressure, heart disease, or diabetes, you are at a higher risk of acute renal failure after surgery.
• Type of surgery: Having a major surgical procedure on your heart or blood vessels causes changes in blood flow and may increase your risk of acute renal failure after surgery.
• Medical complications: Traumatic injuries, significant blood loss, low blood pressure, decreased oxygen levels, or septic shock before, during, or after surgery can also increase the chances of developing acute renal failure. This is due to the inability of the kidney to function as it should when exposed to these conditions.  
• Urinary tract infection: Developing a severe urinary tract infection after surgery can result in acute renal failure, particularly if the infection is not treated or if it does not improve with treatment. 

Acute renal failure that develops after surgery can be detected with blood tests. For example, if a person has a creatinine of 0.8 mg/dl before surgery and a creatinine level of 1.6 mg/dl after surgery, this would be an indication of acute kidney failure.

Urine output is another measure of acute renal failure. A urine output of fewer than 0.5 milliliters of urine per kilogram of body weight per hour that lasts for six hours or more is a sign of acute kidney failure.

If you experience acute renal failure after surgery, you may need dialysis. Usually, kidney function improves over time, and dialysis is not typically necessary for the long term. Less often, the kidney damage is permanent and long-term dialysis is necessary until a kidney transplant can provide a functional kidney. 

Allergic Reaction

A major allergic reaction is generally rapid in progression and can affect heart function and blood flow to the extent that the kidneys may be deprived of adequate blood and oxygen. Acute renal failure is the consequence. 

Glomerulonephritis

Glomerulonephritis is inflammation of the kidneys and generally occurs slowly, causing progressive kidney damage. However, it can reach a point at which it suddenly becomes apparent, causing severe and rapidly progressive symptoms similar to those of acute renal failure.

Inflammatory Disease

Inflammatory conditions, such as lupus and Berger's disease, cause inflammation of varying degrees and can affect any organ of the body. The inflammation affects the kidneys over time, causing progressive, rather than acute renal failure. The gradual kidney failure can produce sudden symptoms and may suddenly become noticeable over a short period of time. 

Genetics

Scientists have found some genetic links to acute renal failure, but the association appears to be weak. Overall, it is still difficult to draw definitive conclusions about the genetics of acute renal failure at this time. 

Cardiovascular

The blood supply to the kidneys can be affected by conditions involving the heart or the blood vessels. Blood clots can also affect the kidneys. When these events occur rapidly, they cause sudden kidney damage, resulting in acute renal failure. 

Heart Attack

A heart attack is a medical crisis that can cause a rapid decrease in the blood supply to any organ of the body, including the kidneys. A severe lack of blood flow and oxygen supply may cause acute renal failure. 

Blood Clots

Blood clots can form in the blood vessels of the kidneys or may travel from elsewhere in the body to the kidneys. If a large enough area of the kidney suffers from lack of blood flow due to blockage from a blood clot, then acute renal failure can occur. 

Vascular Disease

When blood vessels are affected by diseases such as atherosclerosis (hardening of the arteries) or vasculitis (inflammation of the blood vessels), it typically affects blood vessels throughout the body. This includes those that supply the kidneys.

Vascular disease generally causes a slow progression of kidney failure, rather than acute renal failure. But, after a period of a slow progression without symptoms or obvious effects, vascular disease may suddenly cause symptoms that are similar to the symptoms of acute renal failure. 

Lifestyle 

In general, lifestyle issues are not a leading cause of acute renal failure. But, there are some lifestyle factors that can increase your chances of developing the condition.

Illegal Drug Use

The use of illegal drugs can cause sudden, rapid toxicity to the kidneys. In addition, injected drugs increase the risk of aggressive infections that can progress to cause sepsis. 

Heavy Alcohol Use

Heavy alcohol use damages the liver more than it targets the kidneys. The liver and kidneys both metabolize (break down and detoxify) food, medications, and substances that circulate throughout the body.

Heavy alcohol use, which is considered more than 10 to 14 drinks per week, is a cause of slowly progressive direct kidney damage. Additionally, when the liver is damaged and cannot metabolize materials properly, the kidneys are more likely to bear the brunt of the toxins in the body and can eventually fail as well.

Analgesic Overuse 

Several over-the-counter pain medications may cause acute renal failure, especially with excessive or chronic use.

Using pain medication on a daily basis often results in rebound pain when the medications wear off, creating a cycle that potentially exposes you to unnecessary and possibly damaging medication doses.

If you take large amounts of pain medication, discuss your pain and health conditions with your healthcare provider to avoid damaging your kidneys and to figure out whether the cause of your pain could be a serious health problem.