Related Experiment Video
Updated: Mar 28, 2026
Conducting Respiratory Oscillometry in an Outpatient Setting
Published on: April 8, 2022
[RESPIRATORY IMPEDANCE MEASURING BY MostGraph-01 IS AFFECTED BY OBESITY]
Zen Isobe1, Kenichirou Hara, Toshitaka Maeno
1Isobe Clinic.
Background:
The forced oscillation technique (FOT) is a noninvasive method of measuring respiratory impedance, which includes respiratory system resistance (Rrs) and reactance (Xrs). The MostGraph-01 FOT device recently became clinically available in Japan, but standard impedance values for this device have not been determined in Japan.
Objective:
To assess the correlation between spirometry parameters and respiratory impedance in obese (body mass index [BMI]>=25) and non-obese (BMI<25) subjects.
Methods:
Clinical data were collected from 63 subjects without respiratory diseases who underwent spirometry and MostGraph-01 from January to October 2014. We investigated the correlation between spirometry parameters and respiratory impedance, and assessed the differing correlations among obese and non-obese subjects.
Results:
The Rrs at 5 Hz (R5) was significantly correlated with vital capacity (VC), forced vital capacity (FVC), and forced expiratory volume in 1 second (FEV1). The Xrs at 5 Hz (X5), frequency of resonance (Fres), and low-frequency reactance area (ALX) were significantly correlated with the VC, FVC, and FEV1. Obese subjects showed a significantly lower X5 (median, -0.68 cmH2O/l/s vs. -0.35), higher Fres (median, 9.76 Hz vs. 7.46), and higher ALX (median, 2.65 cmH2O/l vs. 1.24) compared to non-obese subjects. Moreover, the VC, FVC, and FEV1 were more highly correlated with R5, X5, Fres, and ALX in nonobese subjects than in obese subjects. A p value of less than 0.05 was considered statistically significant.
Conclusion:
For MostGraph-01, it is suggested that obesity may influence Xrs rather than Rrs.
More Related Videos
08:30Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes
Published on: March 15, 2018
05:56Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
Published on: September 6, 2024
Related Concept Videos
01:27Physical Assessment of the Respiratory Tract II: Inspection
Chest Configuration
The chest configuration...
01:20Assessment of Ventilation I: Respiratory Rate
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
01:15Respiratory Volumes
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
01:29Assessment of Ventilation II: Respiratory Depth and Rhythm
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:
01:23Assessment of Respiration
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like...
01:19Special considerations while measuring oxygen saturation
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...