CPAP

Professional Explanation

During CPAP titration, the technologist typically begins at a low pressure — often 4 cm H₂O in adults — and increases pressure incrementally in response to observed obstructive events, snoring, or flow limitation. The goal is to identify the pressure that eliminates obstructive respiratory events across sleep stages and positions, particularly in REM sleep and supine position.

Common reasons to increase CPAP pressure: persistent obstructive apneas, persistent obstructive hypopneas, persistent snoring not eliminated at the current pressure, and persistent flow limitation associated with arousals or desaturation. The pressure increase must be based on verified events — not artifact, not wake breathing, not central events.

Pressure should NOT be increased when: the observed events are central (no respiratory effort), significant leak compromises signal integrity, the patient shows signs of pressure intolerance, or adequate control of obstructive events has already been achieved.

CPAP may be insufficient when: obstructive events persist at or near the maximum ordered pressure, the patient cannot tolerate the pressure required to control obstruction, treatment-emergent central events appear, or the clinical scenario suggests additional ventilatory support is needed.

Titration Reasoning

When CPAP is working — events resolving, saturation stable, sleep consolidating, patient comfortable — the technologist identifies the therapeutic pressure. When the titration is not progressing — events persist despite increases, centrals emerge, leak cannot be controlled, patient intolerant — the technologist considers whether a mode change is appropriate under protocol and order.

ELI-10

CPAP is like a fan that blows air at one steady speed. It does not change speed when you breathe in or out. The steady stream keeps your throat open so you do not snore or stop breathing. If the fan speed is too low, your throat can still collapse. Too high, and it is uncomfortable. The technologist’s job is to find the right steady speed.

ELI Example

Picture a soft garden hose. If you step on it, water cannot flow. CPAP is like keeping a steady water pressure in the hose at all times — enough to push back against your foot so the water keeps flowing. It does not change the pressure when you turn the water on or off — it just maintains constant support.

Do Not Confuse

• CPAP (one continuous pressure) and bilevel PAP (two different pressures)

• CPAP (airway splinting) and a ventilator (breathing for the patient)

• Pressure that eliminates snoring versus pressure that eliminates apnea

High-Yield Memory Anchors

• CPAP = one continuous pressure for both inhalation and exhalation

• Increase CPAP for verified obstructive events — not for central events, artifact, or leak

• Pressure that works in non-REM may not work in REM

• Comfort matters — an intolerable pressure is not a successful titration

Chapter Recap

CPAP delivers one fixed pressure to splint the airway. Increase for verified obstructive events — not for central events, significant leak, or intolerance. Confirm pressure control across all sleep stages and positions.

CHAPTER 3

Common Mistakes

• Increasing CPAP for central apneas

• Assuming higher pressure always produces better results

• Failing to check leak before increasing pressure

• Stopping titration before confirming pressure in REM sleep

• Ignoring patient comfort — an intolerable pressure will not work at home

Safety and Scope

Follow titration protocol and clinician’s order. Do not exceed ordered maximum without authorization. Notify clinician if CPAP cannot achieve goals within ordered parameters.