NSAID Gastropathy

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Original Editors - Amanda Huber & Emily Sipe  from Bellarmine University's Pathophysiology of Complex Patient Problems project.

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Definition/Description

What is an NSAID? Nonsteroidal Anti-inflammatory drug.

• “Despite well known complications, oral nonsteroidal anti-inflammatory drugs (NSAIDs) remain the most commonly prescribed medications in the US for musculoskeletal disorders such as osteoarthritis” 

What medications are NSAIDs? 

• Ketorolac
• Piroxicam
• Naproxen
• Indomethacin
• Ketoprofen
• Diclofenac
• Ibuprofen
• Nabumetone
• Etodolac
• Oxaproxin

NSAID induced gastropathy can result from too high of dosage or too frequent intake of NSAID drugs as well as long-term use. These drugs are used to decrease pain and inflammation and are often taken by those diagnosed with osteoarthritis and rheumatoid arthritis or other musculoskeletal conditions. Doctors often prescribe this drug to these individuals as well as suggest over the counter (OTC) types of NSAIDs. Because of the easy accessibility of these drugs, the incidence rate of NSAID induced gastropathy is high, especially among individuals who are >60 years.

NSAID induced gastropathy can result in stomach or duodenal ulcers which may even lead to death. There are thousands of hospitalizations over each year just from symptoms resulting from NSAID use. Though these rates are high, most individuals do not know the risk of these medications and continue to take them. Also, this induced gastropathy goes on asymptomatically until it is too late and has caused further damage of the gastrointestinal tract.

“NSAIDs are COX-1 inhibitors which suppress the mucous barrier in the gastrointestinal system which can lead to break down of the GI tract as well as increase in the acidity of the gastric contents.”

Prevalence

• “Patients with rheumatoid arthritis (RA) and osteoarthritis (OA) taking NSAIDs have an ulcer incidence of approximately 15-20%” 
• “Although a 15-25% incidence of gastric and/or duodenal ulcer has been demonstrated in all patients taking NSAIDs, the bleeding rate is estimated by most experts at only 2-4%”.
• 1 in 10 NSAID induced ulcer bleeds. 
• “In elderly patients taking NSAIDs, the relative risk of GI surgery is 10 times, and for GI cause of death, about 4.5 times greater than in control groups” 
• “Approximately 20 million patients in the US take NSAIDs on a regular basis; the risk for hospitalization for serious GI adverse effects is 1-2%, resulting in approximately 200,000 to 400,000 hospitalizations per year at an average cost of $4,000 per patient, or 0.8-1.6 billion dollars annually” 
• “An increased risk of GI bleeding has even been noted in patients taking low dose aspirin therapy for cardiovascular prophylaxis” 
• “Gastric and duodenal lesions were more common in patients who took NSAIDs for <3 months, whereas patients with a longer duration of therapy tended to have more lesions in the small bowel and colon” 
• “Some recent studies have shown that the incidence of duodenal ulcer is increased in Helicobacter pylori-positive patients taking NSAIDs…It has been recently reported that eradication of H.pylori before NSAID therapy strikingly reduces the incidence of ulcer disease in patients being treated with naproxen.” 
• “Among individuals with arthritis, almost 30% report daily use of OTC NSAIDs…Safety often is not considered or well understood among consumers of OTC NSAIDS until after the occurrence of adverse events such as gastropathy”

File:Fig8deaths.jpg

Characteristics/Clinical Presentation

Up to 50% of NSAID induces gastropathy is asymptomatic. 

1. Mild dyspepsia
2. Heartburn
3. Nausea
4. Abdominal discomfort
5. Erosion
6. Ulcers
7. Hemorrhage
8. Perforation
9. Obstruction
10. Occult and frank bleeding
11. Acute colitis
12. Exacerbation of existing colon disease

Associated Co-morbidities

Osteoarthritis

Rheumatoid Arthritis

Ankylosing Spondylitis

Other musculoskeletal conditions

Medications

Prostaglandin E1 analog misoprostol can prevent gastric ulcer and duodenal ulcer 

Proton pump inhibitor (PPI) omeprazole reduces gastric ulcer and prevents duodenal ulcer . Though PPIs can help with gastric irritation, it is also found that they can induce risk of osteoporosis which often cause hip fractures in elderly patients as well as increase cardiovascular risk due to low serum magnesium levels in the blood. 

H2 receptor antagonists are effective in preventing duodenal ulcer but not gastric ulcer. 

“Studies have shown that antacids and buffered tablets do not protect against NSAID injury”

Diagnostic Tests/Lab Tests/Lab Values

An early finding of anemia may warrant more extensive diagnostic testing such as an endoscopy or radiography in determination of NSAID gastropathy. Hematocrit and hemoglobin levels may also provide information about the extent of bleeding from perforation or hemorrhage. As NSAID induced ulcers are often asymptomatic, patient history and diagnostic tests/lab values are important in diagnosis. Endoscopy has a success rate of 90% for diagnosis of a peptic ulcer, however, it is expensive and the rate of correct diagnosis of NSAID gastropathy is high among physicians. (See Tamblyn et al 1997 study.) Radiography with barium can also detect and diagnose peptic ulcers but is less common than endoscopy.

Etiology/Causes

NSAIDs inhibit the enzyme cyclooxygenase which is a necessary enzyme for the synthesis of prostaglandins from arachidonic acid. While inhibition of COX allows NSAIDs to have their anti-inflammatory and analgesic properties by blocking proinflammatory prostaglandins, it also blocks prostaglandins that protect the gastrointestinal system. Prostaglandins in the gastric system help maintain gastric blood flow, increase bicarbonate production, and increase mucus that serves as a protective barrier against bacteria colonization and mechanical injury. Decreased blood flow and decreased mucosa decrease the healing ability and leave the stomach more exposed to injury from pepsin and gastric acid. Furthermore, these decreases lead to “increased back-diffusion of hydrogen ions into epithelial cells with resultant impaired mucosal resistance to injury”.

The function of cyclooxygenase in this process led to the establishment of two COX isoforms: COX-1 and COX-2. COX-1 is found throughout all tissues of the body whereas COX-2 is in the area of inflammation such as in an area of osteoarthritis contributing to the inflammation. Previous NSAIDs included both COX-1 and COX-2 inhibitors, however, in the 1990s COX-2 medications were developed to act on the areas of inflammation without causing the mucosal effects to the GI tract from inhibitng COX-1. COX-2 inhibitors are associated with fewer upper GI side effects, however, they are not as symptom free as hoped and still place people at risk of gastroduodenal mucosa injury. The opinion that only COX-1 affects GI issues is simplistic and not the full story. Medications that suppress acid have shown to be effective in combination with NSAIDs to a greater extent than COX-2 medications alone. These medications are discussed below in the medical management section.
The American College of Gastroenterology used NSAID related studies to identify key risk factors for the development of NSAID gastropathy.

Systemic Involvement

The effects of NSAIDs can occur throughout the GI tract from the esophagus to the colon (384). A potential complication of ulcers left untreated is that the ulcer can perforate through the stomach mucosa and cause infection to spread or the ulcer can erode stomach arteries creating a life-threatening bleed (p.382).
In addition to effects on the GI system, NSAIDs also affect the renal and cardiovascular systems.

Medical Management (current best evidence)

One of the difficulties of NSAID gastropathy is that its course is asymptomatic 50% of the time.  Therefore, it is essential that health care professionals assess each patient's risk factors and recommend either discontinued use of an NSAID or inclusion an accompanying cytoprotectant agent in those patients considered high risk.  A preventative approach of discontinued NSAID use is recommended over treating the gastropathy.

However, if it is not possible to discontinue use of the NSAID, PPIs or H2-receptor antagonists may be prescribed to reduce the gastric effects.  The use of a PPI along with NSAIDs has shown decreased risk of NSAID-related ulcers and adverse drug events compared with H2-receptor antagonists. A COX-2 selective NSAID along with a PPI has shown the best results for reducing gastropathy risk in those who must continue to take NSAIDs. Other treatment options include misoprostol which is a synthetic prostaglandin designed to replace those loss by NSAIDs. However, misoprotol has a lot of side effects that have proved difficult such as abdominal pain, nausea, and diarrhea.

Physical Therapy Management (current best evidence)

add text here

Alternative/Holistic Management (current best evidence)

Up and coming nontoxic NSAIDs but little evidence 

COX-2 selective inhibitors

• COX-1 enzyme is blocked, inflammation is reduced, but protection of stomach lining is lost with normal NSAID
• COX-2 inhibitors block COX-2 enzyme and does not play a role in the gastroprotection, therefore decrease the incidence of gastrointestinal adverse effects and still reduce inflammation and pain. But it may cause cardiovascular complications because it can cause thrombosis due to suppression of inflammatory mediators in atherogenesis. It can also cause renal toxicity and peripheral edema. 
• Two COX-2 inhibitors have been removed from the market recently (fecoxib in 2004 and valdecoxib in 2005)

Nitric oxide- releasing NSAIDs

Topical NSAIDs          

• Deliver the drug directly to the tissue but avoids absorption through the gastrointestinal tract.
  

Differential Diagnosis

“Classic peptic ulcer disease is primarily acid mediated, H. pylori related and duodenal, and it is most common in a younger, typically male, demographic” 

Chron's Disease

Stress induced reflux, ulcers

GERD

Case Reports/ Case Studies

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Resources

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Recent Related Research (from Pubmed)

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References

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