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Anatomy of Respiratory System I: Upper Respiratory Tract01:29

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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
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Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
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Chronic pharyngitis refers to persistent inflammation of the pharyngial mucosa.
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Upper respiratory tract disorders, including viral infections and allergic rhinitis, cause significant discomfort and disrupt daily life. Managing these conditions involves a variety of drugs, such as antihistamines, intranasal steroids, decongestants, antitussives, expectorants, and mucolytics. Specific examples of drugs in each category are provided.
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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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Related Experiment Video

Updated: Jan 11, 2026

Author Spotlight: Advancing Allergic Rhinitis Research with Multicolor Immunofluorescence
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Author Spotlight: Advancing Allergic Rhinitis Research with Multicolor Immunofluorescence

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Rhinosinusitis.

Oliver Liu-Lam1, Kathryn M Hardin1, Zachary A Warren1

  • 1Department of Otolaryngology-Head and Neck Surgery, Emory University School of Medicine, 550 Peachtree Street NE, MOT Suite 1135, Atlanta, GA 30308, USA.

The Medical Clinics of North America
|November 8, 2025
PubMed
Summary
This summary is machine-generated.

This review covers rhinosinusitis diagnosis and management. It details evidence-based strategies for acute and chronic sinusitis, aiding clinical decision-making and improving patient outcomes.

Keywords:
Acute rhinosinusitisAllergic rhinitisChronic sinusitisRhinosinusitisSinus infectionSinusitis

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Area of Science:

  • Otolaryngology
  • Allergy and Immunology
  • Infectious Diseases

Background:

  • Rhinosinusitis significantly impacts patient morbidity, quality of life, and healthcare expenses.
  • Accurate diagnosis and management are crucial for effective patient care.
  • Distinguishing rhinosinusitis from other conditions is essential.

Purpose of the Study:

  • To provide an evidence-based review of rhinosinusitis.
  • To cover classification, pathophysiology, diagnostic criteria, and management.
  • To emphasize differentiation from other conditions and surgical indications.

Main Methods:

  • Literature review of evidence-based studies on rhinosinusitis.
  • Analysis of diagnostic criteria and pathophysiology.
  • Evaluation of current management strategies, including imaging and surgical referral.

Main Results:

  • Rhinosinusitis encompasses a range of conditions affecting the sinuses.
  • Acute and chronic sinusitis have distinct characteristics and management approaches.
  • Imaging plays a role, but clinical presentation is key for diagnosis.

Conclusions:

  • Effective management requires accurate diagnosis and understanding of pathophysiology.
  • Differentiating rhinosinusitis from mimics is critical.
  • Timely referral for surgical intervention is indicated in specific cases.