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Anti-mycobacterial lecture
Concepts
20
Anatomy
Kindergarten
12/11/2012

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Cards

Term
Mycobacteria (major pathogenic species)
Definition
M. tuberculosis, M. leprae, M. avium intracellulaire
Term
Leprosy = Hansen's disease
Definition
M. leprae
Term
MAC in AIDS
Definition
M. avium intracellulaire
Term
inhalation of airborne droplet if nuclei (< 10 bacilli)
Definition
Tuberculosis
Term
Phagocytosis by macrophages (Tuberculosis)
Definition
multiply intracellularly if not activated; may be transported to extrapulmonary sites
Term
Formation of tubercle (tuberculosis)
Definition
dormant in granuloma if immune system activates; If not, liquefaction occurs (air-filled cavity)
Term
productive cough, fever, weight loss, hemoptysis, anorexia, fatigue, night sweats, "consumption"
Definition
Pulmonary TB
Term
skeletal, GU, GI, cutaneous, lymph nodes, CNS; Congenital TB
Definition
Extrapulmonary TB
Term
INH: nonenzymatic metabolism
Definition
associated with s0low acetylator phenotype; is hydrazide of isonictotinic acid, reversible neurotoxicity
Term
INH: enzymatic pathway
Definition
requires acetylation
Term
Rapid acetylators
Definition
may be more prone to hepatotoxicity
Term
nonacetylated INH
Definition
excreted unchanged or as nonenzymatic hydrazine conjugates
Term
Neurotoxicity in INH
Definition
due to depletion of vitamin B6 (cofactor in all aminotransferases, always supplement with pyridoxine)
Term
Rifamycins
Definition
semisynthetic derivatives of macrocycles first isolated for Streptomyces Mediterranei
Term
Rifampin
Definition
wide spectrum of activity but resistance emerges rapidly when used alone; combination with cloxacillin for serious S. aureus infections
Term
inhibits bacterial but not eukaryotic RNA polymerase
Definition
Rifamycins
Term
DOC for meningitis form of TB; orange-pink coloration of ALL body fluids
Definition
Rifampin
Term
inhibits mycolic acid transfer into cell wall; inhibition of RNA synthesis; increase penetration of other drugs; dose-dependent optic neuropathy
Definition
Ethambutol
Term
resistant to at least INH and Rif
Definition
MDR-TB (20%)
Term
multi drug resistant TB + any grou in 2 + any fluoroquinolones (group 3); extremely difficult to treat
Definition
XDR-TB (2%)
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