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Thursday, October 2, 2008

Antitubercular Agents Updates (nclex pharmacology on line classes)

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Antitubercular Agents Updates (pharmacology on line classes) Slideshow Transcript
Slide 1: Antitubercular Agents Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 2: Antitubercular Agents • Tuberculosis, “TB” • Caused by Mycobacterium tuberculosis • Antitubercular agents treat all forms of mycobacterium Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 3: Mycobacterium Infections Common Infection Sites • lung (primary site) • brain • bone • liver • kidney Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 4: Mycobacterium Infections • Aerobic bacillus • Passed from infected: – Humans – Cows (bovine) – Birds (avian) Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 5: Mycobacterium Infections • Tubercle bacilli are conveyed by droplets. • Droplets are expelled by coughing or sneezing, then gain entry into the body by inhalation. • Tubercle bacilli then spread to other body organs via blood and lymphatic systems. • Tubercle bacilli may become dormant, or walled off by calcified or fibrous tissue. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 6: Antitubercular Agents Primary Agents Secondary Agents isoniazid* capreomycin ethambutol cycloserine pyrazinamide (PZA) ethionamide rifampin kanamycin streptomycin para-aminosalicyclic acid (PSA) *most frequently used Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 7: Antitubercular Agents: Mechanism of Action Three Groups • Protein wall synthesis inhibitors streptomycin, kanamycin, capreomycin, rifampin, rifabutin • Cell wall synthesis inhibitors cycloserine, ethionamide, isoniazid • Other mechanisms of action Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 8: Antitubercular Agents: Mechanism of Action isoniazid (INH) • Drug of choice for TB • Resistant strains of mycobacterium emerging • Metabolized in the liver through acetylation— watch for “slow acetylators” Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 9: Antitubercular Agents: Therapeutic Uses Used for the prophylaxis or treatment of TB Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 10: Antitubercular Therapy Effectiveness depends upon: • Type of infection • Adequate dosing • Sufficient duration of treatment • Drug compliance • Selection of an effective drug combination Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 11: Antitubercular Agents: Side Effects • INH peripheral neuritis, hepatotoxicity • ethambutol retrobulbar neuritis, blindness • rifampin hepatitis, discoloration of urine, stools Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 12: Antitubercular Agents: Nursing Implications • Obtain a thorough medical history and assessment. • Perform liver function studies in patients who are to receive isoniazid or rifampin (especially in elderly patients or those who use alcohol daily). • Assess for contraindications to the various agents, conditions for cautious use, and potential drug interactions. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 13: Antitubercular Agents: Nursing Implications Patient education is CRITICAL: • Therapy may last for up to 24 months. • Take medications exactly as ordered, at the same time every day. • Emphasize the importance of strict compliance to regimen for improvement of condition or cure. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 14: Antitubercular Agents: Nursing Implications Patient education is CRITICAL: • Remind patients that they are contagious during the initial period of their illness—instruct in proper hygiene and prevention of the spread of infected droplets. • Emphasize to patients to take care of themselves, including adequate nutrition and rest. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 15: Antitubercular Agents: Nursing Implications • Patients should not consume alcohol while on these medications nor take other medications, including OTC, unless they check with their physician. • Diabetic patients taking INH should monitor their blood glucose levels because hyperglycemia may occur. • INH and rifampin cause oral contraceptives to become ineffective; another form of birth control will be needed. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 16: Antitubercular Agents: Nursing Implications • Patients who are taking rifampin should be told that their urine, stool, saliva, sputum, sweat, or tears may become reddish-orange; even contact lenses may be stained. • Vitamin B6 may is needed to combat peripheral neuritis associated with INH therapy. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 17: Antitubercular Agents: Nursing Implications Monitor for side effects • Instruct patients on the side effects that should be reported to the physician immediately. • These include fatigue, nausea, vomiting, numbness and tingling of the extremities, fever, loss of appetite, depression, jaundice. Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

Slide 18: Antitubercular Agents: Nursing Implications Monitor for therapeutic effects: • Decrease in symptoms of TB, such as cough and fever • Lab studies (culture and sensitivity tests) and CXR should confirm clinical findings • Watch for lack of clinical response to therapy, indicating possible drug resistance Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.





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