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Philadelphia versus Miami-J cervical collar's impact on pulmonary function
Alireza Ala1, Samad Shams Vahdati1, Parham Maroufi2
1Emergency medicine research team, Tabriz University of medical sciences, Tabriz, Iran.
The American Journal of Emergency Medicine
|February 1, 2021
Summary
Both Philadelphia and Miami-J cervical collars significantly reduced expiratory flow in healthy volunteers. While not clinically significant for healthy individuals, these findings highlight potential respiratory compromise risks in patients with pre-existing conditions.
Area of Science:
- Pulmonary Medicine
- Biomedical Engineering
Background:
- Cervical collars are frequently used for spinal immobilization.
- The impact of cervical collars on respiratory mechanics is not fully understood.
Purpose of the Study:
- To compare the effects of Philadelphia and Miami-J cervical collars on pulmonary function and ventilation.
- To assess changes in spirometry, peak expiratory flow, and ventilation parameters.
Main Methods:
- Healthy volunteers were randomized to wear either a Philadelphia or Miami-J cervical collar.
- Pulmonary function tests (spirometry, peak flow) and capnography were performed before and after collar application.
- Measurements were taken 30 minutes after collar fixation.
Main Results:
- A statistically significant decrease in FEV1, FEV1/FVC, FEF25-75%, and PEF was observed with both collar types (p < .001).
- Forced Vital Capacity (FVC) showed no significant change (p = .157).
- The observed expiratory flow obstruction was not clinically significant in healthy participants.
Conclusions:
- Both Philadelphia and Miami-J cervical collars induce significant expiratory flow obstruction.
- These findings suggest potential respiratory implications for patients with pre-existing respiratory compromise when using cervical collars.
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