CPAP vs BiPAP: Understanding the Key Differences for Sleep Apnea Treatment

Confused about CPAP and BiPAP machines? Our respiratory experts break down the key differences, benefits, and which therapy is right for your sleep apnea.

The short answer: CPAP delivers one constant air pressure all night, while BiPAP delivers two pressures — a higher one when you inhale and a lower one when you exhale. CPAP is the standard first-line therapy for obstructive sleep apnea; BiPAP is typically prescribed when a patient can't tolerate CPAP's constant pressure or has a condition like COPD or central sleep apnea that needs extra help exhaling.

	CPAP	BiPAP
Pressure delivery	One fixed pressure, continuous	Two pressures (inhale/exhale)
Best for	Obstructive sleep apnea (first-line)	COPD, central sleep apnea, CPAP-intolerant patients
Comfort for high pressures	Can feel hard to exhale against	Easier to exhale against
Typical cost	Lower	Higher
Prescription	Sleep study confirming OSA	Sleep study + often a failed CPAP trial

What is Sleep Apnea?

Sleep apnea is a serious sleep disorder where breathing repeatedly stops and starts during sleep. The most common type, obstructive sleep apnea (OSA), occurs when throat muscles relax and block the airway. Left untreated, sleep apnea can lead to high blood pressure, heart disease, stroke, and daytime fatigue.

What is a CPAP Machine?

CPAP (Continuous Positive Airway Pressure) machines deliver a steady, continuous stream of pressurized air through a mask to keep your airway open during sleep.

How CPAP Works

1. The machine draws in room air
2. Air is pressurized to a prescribed level
3. Pressurized air travels through tubing to your mask
4. Continuous pressure keeps your airway open

Types of CPAP Machines

Fixed Pressure CPAP

• Delivers one constant pressure setting
• Set by your sleep specialist based on your sleep study
• Most affordable option

Auto-CPAP (APAP)

• Automatically adjusts pressure based on your needs
• Responds to breathing events in real-time
• More comfortable for many users
• Ideal for users whose pressure needs vary

Popular CPAP Models

• ResMed AirSense 11 – Latest technology with app connectivity
• Philips DreamStation 2 – Compact design with advanced features
• 3B Medical Luna G3 – Budget-friendly with premium features

What is a BiPAP Machine?

BiPAP (Bilevel Positive Airway Pressure) machines deliver two different pressure levels: a higher pressure when you inhale (IPAP) and a lower pressure when you exhale (EPAP).

How BiPAP Works

1. Machine detects when you inhale and exhale
2. Higher pressure (IPAP) assists inhalation
3. Lower pressure (EPAP) makes exhaling easier
4. Pressure difference reduces work of breathing

Who Needs BiPAP?

• Patients who can't tolerate high CPAP pressure
• Those with central sleep apnea
• Patients with COPD or other respiratory conditions
• Users who need higher pressure settings (>15 cmH2O)
• Those with hypoventilation syndromes

CPAP vs BiPAP: Key Differences

Feature	CPAP	BiPAP
Pressure Settings	One constant pressure	Two pressures (IPAP/EPAP)
Primary Use	Obstructive sleep apnea	Central/complex sleep apnea, COPD
Cost	$500-$1,500	$1,500-$4,000
Prescription	Required	Required
Insurance Coverage	Usually covered	Usually covered with documentation
Comfort	Some find exhaling difficult	Easier exhaling

Which is Right for You?

Choose CPAP If:

• You have obstructive sleep apnea
• You're new to PAP therapy
• You want a more affordable option
• Your pressure needs are moderate (<15 cmH2O)

Choose BiPAP If:

• CPAP therapy hasn't worked for you
• You have central or complex sleep apnea
• You have COPD or other lung conditions
• You need higher pressure settings
• You struggle exhaling against CPAP pressure

Auto-CPAP: The Best of Both Worlds?

Auto-CPAP (APAP) machines have become increasingly popular because they automatically adjust pressure throughout the night. Benefits include:

• Better comfort – Pressure only increases when needed
• Improved compliance – More users stick with therapy
• Adapts to changes – Adjusts for weight changes, sleeping position, etc.
• Data tracking – Most models connect to apps for sleep data

Top CPAP & BiPAP Machines at 800Oxygen

Best Overall: ResMed AirSense 11 Auto CPAP

• Auto-adjusting pressure
• Quiet operation (26 dBA)
• App connectivity
• Starting at $899

Best Budget: 3B Medical Luna G3 Auto CPAP

• Full-featured at an affordable price
• Built-in heated humidifier
• Starting at $499

Best BiPAP: ResMed AirCurve 10 VAuto

• Bilevel auto-adjusting
• Excellent for complex sleep apnea
• Starting at $1,599

Getting Started with PAP Therapy

1. Get a sleep study – Diagnosis is required
2. Get a prescription – Your doctor will prescribe settings
3. Choose your machine – Our specialists can help
4. Find the right mask – Critical for success
5. Use it every night – Consistency is key

Shop CPAP & BiPAP Machines

800Oxygen offers the complete selection of CPAP and BiPAP machines with:

• Free shipping on orders over $99
• 110% price match guarantee
• Respiratory equipment specialists to help you choose
• NO RETURNS, NO REFUNDS. ALL SALES ARE FINAL.

Browse our CPAP machines or call (877)699-4365 to speak with a specialist.