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Related Concept Videos

Respiratory Volumes01:15

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
Chest Configuration
The chest configuration can...
Suctioning the Oropharyngeal Airway01:25

Suctioning the Oropharyngeal Airway

In preparing for oropharyngeal airway suctioning, a nurse must gather all necessary equipment, including a suction unit with tubing, a prepackaged suction kit, sterile gloves, water or saline for irrigation, a water-soluble lubricant, and additional personal protective equipment (such as a gown, mask, and goggles) to control infections.
After assembling the equipment, the nurse should practice hand hygiene and don appropriate PPE according to infection control guidelines to avoid the...

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Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry
06:26

Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

Published on: December 9, 2025

Airway volume for different dentofacial skeletal patterns.

Hakan El1, Juan Martin Palomo

  • 1Faculty of Dentistry, Hacettepe University, Ankara, Turkey. palomo@case.edu

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|June 7, 2011
PubMed
Summary

Class II patients have smaller oropharyngeal (OP) airway volumes compared to Class I and III. Mandibular position significantly impacts OP volume, with retruded positions linked to smaller airways.

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Area of Science:

  • Orthodontics and Dental Anatomy
  • Craniofacial Morphology
  • Airway Analysis

Background:

  • Dentofacial skeletal patterns influence upper airway dimensions.
  • Understanding nasal passage (NP) and oropharyngeal (OP) volumes is crucial for assessing airway patency.
  • Variations in maxilla and mandible position may affect airway size.

Purpose of the Study:

  • To evaluate NP and OP volumes in patients with different dentofacial skeletal patterns.
  • To determine the impact of maxilla and mandible positions on airway dimensions.
  • To correlate specific skeletal measurements with airway volumes.

Main Methods:

  • 140 patients categorized into Class I, II, and III based on ANB angle.
  • Further stratification based on SNA and SNB angles to assess jaw positioning.
  • Kruskal-Wallis test for group differences, Spearman correlation for variable relationships, and multiple regression for predictive modeling.

Main Results:

  • Class II patients exhibited significantly smaller OP volumes than Class I and III.
  • A statistically significant difference in NP volume was found only between Class I and Class II groups.
  • Retruded mandibular positions (lower SNB angles) correlated with smaller mean OP airway volumes.

Conclusions:

  • Oropharyngeal airway volumes are reduced in Class II patients.
  • Mandibular position relative to the cranial base is a key determinant of OP airway volume.
  • Nasal passage volume differences were primarily observed between Class I and Class II groups.