make a note on pharmacology and classification of antifungals in short amphotericin b in details and role of antifungals In ent in detail for essay answer of ent pg exam and make it into pdf
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Antifungals ENT PG Essay
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What's Inside the PDF
The document is structured as a full essay answer, organised into 6 sections:
Section 1 — Introduction
Why fungal infections are rising; why they're pharmacologically challenging (eukaryotes); evolution from amphotericin B to modern agents.
Section 2 — Classification of Antifungal Agents
Full classification table with mechanism, agents, and route:
| Class | Mechanism | Key Agents |
|---|---|---|
| Polyenes | Bind ergosterol → membrane pores | Amphotericin B, Nystatin |
| Azoles (Imidazoles) | CYP450 14α-demethylase inhibition | Ketoconazole, Clotrimazole |
| Azoles (Triazoles) | Same, more selective | Fluconazole, Itraconazole, Voriconazole, Posaconazole |
| Echinocandins | β-(1,3)-D-glucan synthase inhibition | Caspofungin, Micafungin, Anidulafungin |
| Allylamines | Squalene epoxidase inhibition | Terbinafine |
| Miscellaneous | DNA/RNA inhibition, microtubule disruption | 5-FC (Flucytosine), Griseofulvin |
Section 3 — Amphotericin B (Detailed)
- Source & Chemistry (heptaene macrolide from Streptomyces nodosus)
- Mechanism of action (ergosterol binding → ion channel pores → fungicidal)
- Full spectrum of activity table
- Detailed pharmacokinetics table
- Lipid formulations — full comparison table (Fungizone vs AmBisome vs Amphocil vs Abelcet)
- Adverse effects: infusion-related (fever, rigors, bronchospasm) and dose-dependent (nephrotoxicity, hypokalaemia, anaemia)
- Drug interactions
- Clinical indications table
Section 4 — Role of Antifungals in ENT (Detailed)
- Otomycosis: aural toilet + topical clotrimazole; systemic only in immunocompromised
- Fungal Ball: surgery alone; antifungals NOT needed in immunocompetent
- AFRS: surgery + steroids are mainstay; antifungals have limited adjunct role
- Acute Invasive FRS (AIFS): medical emergency — three pillars (surgery + immunosuppression reversal + IV L-AMB/voriconazole), black turbinate sign
- Chronic & Granulomatous Invasive FRS: prolonged antifungal + surgery
- Oropharyngeal/Laryngeal Candidiasis: topical nystatin/clotrimazole or systemic fluconazole
Section 5 — High-Yield PG Exam Quick Revision Table
20 classic exam Q&A pairs (DOC for mucormycosis, drugs NOT active against Mucorales, AFRS mucin pathology, etc.)
Section 6 — References
Katzung, Goodman & Gilman, K.J. Lee's Essential Otolaryngology, Goldman-Cecil Medicine, Jawetz Microbiology.
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