docTo the Rescue Terry L. Forrette, M.H.S., RRT FRC: What is it?
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To the Rescue Terry L. Forrette, M.H.S., RRT FRC: What is it?
CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Presentation Overview CPAP To The Rescue • A few definitions • An overview of APE • What is CPAP and why is it necessary • CPAP systems and how to use them Terry L. Forrette, M.H.S., RRT Sponsored by Medical Specialties FRC: What is it? Just So We Are Clear … • FRC – Functional Residual Capacity • CPAP – Continuous Positive Airway Pressure • Ventilation – the process of removing CO2 • Oxygenation – adding O2 to the blood There is always a minimal amount of gas left in the lungs at the end of exhalation This is called the FRC (functional residual capacity) Changes in FRC What Alters the FRC? • Pulmonary Contusions • Acute Pulmonary Edema – Congestive Hear Failure – Hydrocarbon Inhalation – Drug Induced • Acute Respiratory Insufficiency – Smoke Inhalation – Drowning • Lung Infiltrates (gram negative pneumonia) www.tlforrette.com [email protected] (504)722-3739 Low FRC Normal FRC • A low FRC results in: – Poor oxygenation – Increased work of breathing TL Forrette & Associates Wisdom is knowledge applied 1 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Distribution of Inspired Gas Why is FRC Important? Which one is harder to inflate? Normal FRC Low FRC Low FRC Normal FRC Continuous Positive Airway Pressure (CPAP) • The patient breathes spontaneously from a continuous flow of gas, at a set pressure • Positive pressure is generated in the lung during inspiration and exhalation CPAP takes the lungs from this www.tlforrette.com [email protected] (504)722-3739 Physiology of CPAP • Lung units are re-recruited • Oxygenation is improved, work of breathing is minimized Using CPAP to Restore FRC To This TL Forrette & Associates Wisdom is knowledge applied 2 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Indications for CPAP Clinical Applications of CPAP Condition Area for Treatment ARDS Emergency Pulmonary edema Emergency Acute Respiratory Failure Emergency CHF/COPD Emergency Anesthesia Pre Operative Atelectasis ICU/General Ward Alternative to Mechanical Ventilation ICU/General Ward Weaning from Mechanical Ventilation ICU/General Ward X Acute Pulmonary Edema We Have All Seen This Patient • • • • • • Terminology • Heart Failure: The inability of the Labored breathing SpO2 <85% Tachy and febrile Mild cyanosis Mild confusion Distant breath sounds heart to maintain an output adequate to maintain the metabolic demands of the body. • Pulmonary Edema: An abnormal accumulation of fluid in the lungs. • CHF with Acute Pulmonary Edema: Pulmonary Edema due to Heart Failure (Cardiogenic Pulmonary Edema) Hypertension • Hypertrophic Cardiomyopathy www.tlforrette.com [email protected] (504)722-3739 Pulmonary Edema & Acute Pulmonary EDEMA • An abnormal accumulation of fluid in the lungs TL Forrette & Associates Wisdom is knowledge applied 3 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Normal CHF with PE CPAP with Acute Pulmonary Edema (APE) “CPAP is to APE like D50 is to insulin shock” Russell K. Miller Jr. MD, FACEP CPAP and Gas Exchange Why Not Just Tube Him? Believe it or not, there are people who might actually enjoy intubation. Your patient however, may not be among them. CPAP Exclusions Important Consideration -Unstable Airway -Traumatic Etiology of Respiratory. Distress -Severe Altered Mental Status -Facial Trauma or Impossible Face Seal www.tlforrette.com [email protected] (504)722-3739 • Emphysema and Asthmatic patients do NOT respond predictably to CPAP. – They have a higher risk of complications such as pneumothorax, and thus caution should be used when treating with CPAP TL Forrette & Associates Wisdom is knowledge applied 4 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Some Patients May Need CPAP but … CPAP Systems Early CPAP Systems The Early Equipment Vortex blower 1983 www.tlforrette.com [email protected] (504)722-3739 Glue-on mask 1985 TL Forrette & Associates Wisdom is knowledge applied 5 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT Basic Components of A Traditional CPAP System And You Thought Your Truck Was Crowded -Mask -Tubing -Gas Source -PEEP Regulation -Generator Pneumatic Flow Generators Application Continued www.tlforrette.com [email protected] (504)722-3739 Application of CPAP CPAP System TL Forrette & Associates Wisdom is knowledge applied 6 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT New Generation of CPAP Systems Vitaid PulmodyneTM Philips Respironics Boussignac O2-RESQTM WhisperFlow ® Virtual Valve CPAP Systems Mercury Medical® Flow-Safe TM Mercury Medical Flow-Safe Vitaid Boussignac Virtual CPAP Valve CPAP delivered to patient is determined by liter flow set on the Flowmeter. Oxygen flows into the chamber Oxygen acceleration Virtual Valve CPAP Systems Establishment of a virtual valve • CPAP is titrated by flow. • 2.5 – 10 cm H20 • O2 flow 5 – 25 LPM • Use in-line gauge to measure pressure The collision of the molecules between themselves generates a turbulence which transforms the speed into CPAP pressure. Oxygen braking The molecules of oxygen strike a deflector which directs them back to the central zone (mixing zone). Objectives of CPAP Therapy? as G Su pp or t of k or e W ing ag t h a n ea M Br Ex ch an ge How Much CPAP is Being Delivered Prevent Ventilatory Failure www.tlforrette.com [email protected] (504)722-3739 TL Forrette & Associates Wisdom is knowledge applied 7 CPAP – To the Rescue Terry L. Forrette, M.H.S., RRT If you find me on the road … Please try not to intubate me Comments and Questions www.tlforrette.com Thank You www.tlforrette.com [email protected] (504)722-3739 TL Forrette & Associates Wisdom is knowledge applied 8
