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Related Concept Videos

Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
Respiratory System Abnormal Finding II: Palpation and Auscultation01:31

Respiratory System Abnormal Finding II: Palpation and Auscultation

In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
Palpation Findings
During a respiratory assessment, palpation can reveal several vital abnormalities:
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
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:
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 Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...

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Related Experiment Video

Updated: Jun 25, 2026

Conducting Respiratory Oscillometry in an Outpatient Setting
14:49

Conducting Respiratory Oscillometry in an Outpatient Setting

Published on: April 8, 2022

[Preoperative lung function tests by impulse oscillation system].

Yasura Suzuki1

  • 1Department of Anesthesiology, Showa University School of Medicine, Tokyo 142-8666.

Masui. the Japanese Journal of Anesthesiology
|February 21, 2009
PubMed
Summary

Impulse oscillation system (IOS) offers a non-effort-dependent method for preoperative respiratory assessment. This technique effectively evaluates airway resistance and reactance, proving useful for peripheral airway condition studies.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Preoperative Assessment

Background:

  • Preoperative respiratory function tests are crucial for patient evaluation.
  • Traditional spirometry and flow-volume curves require maximal expiratory efforts.
  • Impulse oscillation system (IOS) measures airway resistance and reactance during normal breathing.

Purpose of the Study:

  • To evaluate the utility of the impulse oscillation system (IOS) for preoperative respiratory function assessment.
  • To compare IOS parameters in normal, obstructive, and restrictive respiratory groups.
  • To determine if IOS can assess peripheral airway conditions without maximal patient effort.

Main Methods:

  • 300 adult patients undergoing elective surgery were enrolled.
  • Preoperative respiratory function was assessed using IOS, spirometry, flow-volume curves, and N2 washout.
  • Patients were categorized into normal, obstructive, and restrictive groups (100 each).

Main Results:

  • Obstructive and restrictive groups showed significantly higher total (R5), large (R20), and small (R5-R20) airway resistance compared to the normal group.
  • Both obstructive and restrictive groups exhibited significantly lower reactance (X5) than the normal group.
  • IOS measurements were successfully obtained without requiring maximal respiratory efforts.

Conclusions:

  • IOS is a valuable tool for preoperative respiratory assessment, requiring no maximal patient effort.
  • IOS measurements can be performed during spontaneous breathing with high temporal resolution.
  • The impulse oscillation system is effective for evaluating peripheral airway conditions and physiological respiratory changes.