â– LECTURE OVERVIEW: Epistaxis (nosebleeds) is a common clinical presentation, most commonly originating from a highly vascularized anatomical zone in the anterior nasal septum.
â– ANASTOMOTIC VASCULAR CHANNELS:
1. Kiesselbach's Plexus: A highly dense, planar arterial network located in the anterior-inferior quadrant of the nasal septum, also termed Little's Area.
2. Five Arterial Inlets:
- Anterior Ethmoidal Artery (from the Ophthalmic/Internal Carotid).
- Posterior Ethmoidal Artery (from the Ophthalmic/Internal Carotid).
- Sphenopalatine Artery (terminal branch of the Maxillary/External Carotid).
- Greater Palatine Artery (from the Maxillary/External Carotid).
- Septal Branch of the Superior Labial Artery (from the Facial/External Carotid).
3. Mucosal Vulnerability: The mucosa overlying Kiesselbach's plexus is exceptionally thin and superficial, leaving the vessels unprotected.
â– SPECIAL CLINICAL POPULATIONS & METABOLIC DEVIATIONS:
Infants display higher body water ratios and immature renal filtration capacity, whereas geriatric cohorts exhibit reduced physiologic reserves, progressive heart/renal decline, and polypharmacy interactions.
â– HISTOCHEMICAL & SPECIAL STAIN ANALYSIS:
Tissue examination is enhanced by specialized dyes and immunophenotypic markers that target cellular structure with remarkable specificity.
[HY-BOARD-1334]
🌟 Dynamic Clinical Key:
Kiesselbach's Plexus is the site of over 90% of all anterior pediatric and adult epistaxis. Bleeding is triggered by local trauma (nose picking), low environmental humidity, or mucosal dry cracks. It is managed with direct compression, anterior nasal packaging, or localization and chemical cautery with silver nitrate. Adjust weight-based dosing for pediatric cohorts and use the 'start low and go slow' approach for seniors. Always cross-reference histochemical stains with structural boundaries on the biopsy.