High flow cannula oxygen delivery and the hypoxemic patient

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Presentation transcript:

High flow cannula oxygen delivery and the hypoxemic patient Eustace S Fernandes MD Lutheran Medical Group Pulmonary and Critical Care

Objectives Discuss rationale for high flow nasal cannula (HFC) usage Discuss physiologic implications of high flow cannula oxygen delivery Discuss the use of HFC in particular disease states COPD OSA High risk extubation

Why do we need oxygen?

Causes of hypoxemia V/Q mismatch Shunt Diffusion disorder Alveolar hypoventilation Altitude Abnormal Hb

Special Patient Populations CO2 retainers Nocturnal vs continuous in severe COPD

Modes of Oxygen Delivery Spontaneous respiration Nasal cannula High Flow NIV Mechanical ventilation ECMO Patient effort

Why High Flow?

What is high flow delivery? What affects the volume of oxygen inhaled? Gas flow Concentration of oxygen from flow meter Inspired volume RR and VT Respiratory pattern

What is HFC delivery? Requirements: Gas delivery system Humidification Heater Patient interface Cannula must accommodate 60LPM flow 4mm-6.5mm diameter

What is HFC delivery? Increased FIO2 CPAP effect Comfort Warmth /humidification Improved mucociliary clearance

Int Care Med 2011; 37 (11): 1780-1786

Specific Diseases COPD OSA High risk extubation

COPD

Burden of COPD exacerbation COPD effects 1/10 globally 15M in US 3rd leading cause of death 13.2 billion in annual HC costs COPD exacerbations causes worsening of underlying chronic condition and may increase mortality

 Chronic Obstr Pulm Dis. 2014; 1(2): 166-184

Outpatient HFC? 6.2 kpa=46mmHg 8.9kpa=66.8mmHg

Why?

OSA

Positive pressure therapy remains standard of care

Compliance remains an issue…..

Could HFC delivery be an alternative to CPAP?

TNI: HFC delivery

Children? Often associated with a broader medical syndrome Therapeutic options Tonsillectomy Wedge Oral appliance Nasal steroids CPAP/BiPAP

HFC delivery in children

High risk extubation

Who is high risk? Age > 65 APACHE II score > 12 BMI > 30 Airway patency problems Secretions (suction > 2 x prior to extubation) Difficult/prolonged wean Prior failure Co-morbid conditions

Is HFC superior to conventional oxygen therapy?

Conclusions Oxygen is necessary Multiple modalities of oxygen delivery tailored to the patient’s need and ability to participate High flow nasal cannula is a unique delivery system that may help struggling patients “bridge the gap.” High flow nasal cannula has applications in acute and chronic settings that may improve patient comfort, outcomes and morbidity More studies are needed to define the role of HFC in treatment of the hypoxemic patient