Gord Minaker, Primary Care Paramedic and Medical Student with the UBC Medical Program
Kaela Richardson, Respiratory Therapist and Medical Student with the UBC Medical Program
What IS CPAP? Gord Minaker hosts fellow medical student and current respiratory therapist Kaela Richardson for a brief episode on CPAP in the prehospital setting. Together they review the physiological mechanisms of CPAP and how this applies to certain patient populations and their associated pathologies. Other topics include nebulizer use, indications, contraindications and settings for CPAP, as well as a brief discussion on BiPAP.
Positive pressure within the airways and alveoli improves respiratory function:
Ventilation-perfusion mismatching, aka V/Q mismatching, refers to an abnormal ratio of ventilation to perfusion in the lung. It can be caused by a number of different pathologies, depending on which aspect is reduced. In this episode we mention shunting, which refers to a V/Q mismatch involving adequate perfusion but poor ventilation. This occurs when air is not reaching the alveoli, and blood flowing by these areas are not participating in gas exchange. Without gas exchange, the blood remains deoxygenated and hypercarbic, which can be observed as a low SpO2 and/or a high respiratory rate in a clinical presentation.
BCEHS Handbook: Treatment Guidelines for CPAP - PCP
NCBI - Continuous Positive Airway Pressure
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