Non-Steroidal Anti-Inflammatory Drugs work primarily by inhibiting the enzyme cyclooxygenase, which blocks the synthesis of prostaglandins from arachidonic acid. Prostaglandins are lipid compounds that mediate inflammation, fever, and pain transmission in peripheral tissues.
Classification separates agents based on their selectivity for these two enzyme isoforms:
Clinical application of NSAIDs relies on their triple pharmacological properties: analgesic, anti-inflammatory, and antipyretic actions. Nurses administer these agents across various healthcare settings for musculoskeletal disorders, acute trauma, postoperative pain, and mild-to-moderate pyrexia.
Inhibition of housekeeping prostaglandins leads to predictable systemic side effects. The gastrointestinal tract frequently bears the brunt of non-selective NSAID therapy, ranging from dyspepsia to occult bleeding and peptic ulcer perforation.
| Body System | Potential Adverse Effect | Underlying Mechanism |
|---|---|---|
| Gastrointestinal | Gastric ulceration, bleeding | Decreased cytoprotective mucus production |
| Renal | Fluid retention, acute kidney injury | Reduced renal medullary blood flow |
| Cardiovascular | Hypertension, thrombotic events | Imbalance in prostacyclin and thromboxane |
| Hematologic | Prolonged bleeding time | Inhibition of platelet aggregation |
Certain clinical profiles preclude safe administration of NSAIDs. Active peptic ulcer disease, severe renal impairment, and known hypersensitivity reactions absolute contraindicate use. Pregnant women in their third trimester must avoid NSAIDs due to the risk of premature closure of the ductus arteriosus in the fetus.
Concurrent administration with anticoagulants like warfarin or heparin exponentially increases bleeding risks. Combining NSAIDs with ACE inhibitors or loop diuretics diminishes the antihypertensive and diuretic efficacy while heightening the risk of nephrotoxicity.
Comprehensive pre-administration assessment prevents avoidable complications. The nurse must review the patient's medical history for a prior history of asthma, peptic ulcers, kidney disease, or cardiovascular disorders. Baseline blood pressure, serum creatinine, and blood urea nitrogen values establish reference points for monitoring.
Administering oral NSAIDs with food, milk, or a proton pump inhibitor minimizes gastric irritation. Nurses must monitor for signs of occult blood loss, black tarry stools, and unexplained bruising. Patient education emphasizes adhering strictly to prescribed dosage limits and avoiding concurrent use of over-the-counter analgesics without professional guidance.