Why CPAP Must Continue In Hospitals To Protect Your Life

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En este audio aprenderás por qué es esencial seguir usando tu CPAP en el hospital para proteger tu respiración, tu corazón y tu recuperación.

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🇨🇳 中文（简体）

在这段音频中，你将了解为什么住院时继续使用CPAP对你的呼吸、心脏和康复至关重要。

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Preface: A Personal Story That Inspired This Article

A few days ago, I called a friend who had been admitted to the hospital. The moment he spoke, I sensed something was wrong. His speech was slurred, his responses were slow, and his voice lacked its usual strength. The next morning, I visited him in his hospital room—and what I saw was deeply concerning.

He was lying in bed lethargic, slack-jawed, and barely interactive, breathing through his open mouth with his tongue protruding slightly. His eyes were half-open, fixed upward, and his breathing pattern resembled the agonal respirations I had witnessed countless times in critically ill patients nearing the end of life during my years in emergency medicine.

His heart rate sat in the low 40s, and although his oxygen saturation looked acceptable at 95%, that was only because he was receiving 5 liters of supplemental oxygen. Despite the oxygen, his overall appearance was one of physiological distress.

When I asked his wife about his CPAP, she told me something that explained much of what I was seeing:
He had not slept well for the past three nights because he was not using his CPAP.

He normally uses CPAP at home every night for obstructive sleep apnea, but no one had provided him with CPAP in the hospital, and she hadn’t realized he needed to bring his machine.

She also mentioned another detail: at 10 AM, when I arrived, he had not eaten breakfast yet. His extreme lethargy, unstable breathing, and poor alertness had made it impossible for him to participate in even the simplest self-care.

I urged his wife—three times—to please go home and bring his CPAP machine. When she finally returned, I set the CPAP up and placed it on him myself.

The change was almost immediate.

His heart rate increased into the upper 40s and occasionally touched the low 50s, despite being on a beta blocker. His breathing became more regular. His facial muscles relaxed. His eyes began to focus. Freed from repeated apneas and the nightly stress of oxygen deprivation, he looked like someone returning to the surface after nearly drowning.

With his breathing stabilized, I could finally reposition him onto his side to prevent pressure injuries and place pillows under his legs to protect his ankles—simple but essential interventions that had not been possible moments earlier.

Watching this transformation reinforced something that many patients and families don’t know:

CPAP must be continued even in the hospital.

Stopping CPAP—even for one night, let alone three—can trigger dangerous shifts in oxygenation, carbon dioxide levels, heart rhythm, and mental status. Add illness, medications, and inactivity, and the deterioration can be dramatic, just as it was for my friend.

This experience is the reason I wrote this article: to explain why hospitalized patients with obstructive sleep apnea should continue using their CPAP, why one study showing no change in mortality or length of stay does not tell the whole story, and why CPAP can—and often should—be used even when oxygen is required.

Why This Topic Matters

Obstructive sleep apnea (OSA) is much more common than many people realize. Recent data suggest that roughly 30–50 million American adults may have OSA. lung.org+2ScienceDirect+2

• One contemporary estimate (2024) puts the number at about 80.6 million U.S. adults — that is about 32.2% of the adult population. Apnimed
• Other sources commonly cite about 30 million Americans with clinically recognized sleep apnea. lung.org

Given this vast number — tens of millions — many of those entering the hospital will likely have undiagnosed or previously treated OSA.

That means when patients are hospitalized, there are many individuals whose CPAP therapy might be interrupted — with potentially serious consequences.

Because OSA is so prevalent, and because many patients are undiagnosed or lose access to their CPAP during hospitalization, the risk of sleep-disordered breathing worsening in the hospital is substantial.

That’s why it’s critically important to raise awareness: continuing CPAP (or resuming it) in the hospital may affect a very large segment of patients — not just the rare few.

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The Study: What It Found — and What It Didn’t

A 2016 study from Sleep and Breathing evaluated OSA patients who used CPAP at home and were admitted to a general hospital ward. Some used CPAP in the hospital; some did not.

Here’s what the study found:

• No reduction in length of stay (LOS)
• No reduction in 30-day readmissions
• No measurable difference in mortality (too few events to compare)

This is often interpreted as:
“CPAP doesn’t help in the hospital.”

But that conclusion is incomplete. The study did not measure:

• Sleep architecture
• Cortisol levels
• Blood sugar
• Carbon Dioxide retention in the lungs
• Arrhythmia burden
• Autonomic stability
• Delirium risk
• Tissue oxygenation patterns
• Pressure ulcer risk from immobility

These are the real-world physiologic outcomes that make CPAP essential during hospitalization.

The absence of improvement in LOS or short-term mortality does not mean CPAP is unhelpful. It only means the benefits are not captured by administrative endpoints.

Why the Study Didn’t Show Short-Term Benefits

Because length of stay and short-term mortality are poor measurements of CPAP’s primary effects.

Hospital stays are too short to display:

• Improved glycemic patterns
• Reduced chronic inflammation
• Better long-term cardiac function
• Cognitive improvement
• Lower long-term readmissions

CPAP’s benefits are physiologic, not administrative.

My friend didn’t need a change in length of stay—he needed to stop breathing like a dying patient.

He needed sleep.

He needed oxygenation.

He needed CPAP.

Reference:
Kamel, Ghassan, et al. “Use of CPAP in Patients with Obstructive Sleep Apnea Admitted to the General Ward: Effect on Length of Stay and Readmission Rate.” Sleep and Breathing, vol. 20, no. 3, 2016, pp. 1103–1110, https://pubmed.ncbi.nlm.nih.gov/26946418/

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CPAP in the Perioperative Setting: Why It Matters Before and After Surgery

Patients with OSA face two- to three-times higher rates of respiratory and cardiac complications surrounding surgery. Anesthesia, sedatives, opioids, and immobility worsen apnea severity.

The review CPAP in the Perioperative Setting: Evidence of Support highlights that:

• Stopping CPAP before surgery destabilizes breathing.
• Opioids suppress respiratory drive, increasing apnea severity.
• Perioperative CPAP reduces postoperative respiratory complications, including hypoxemia and reintubation.
• Even undiagnosed or high-risk patients benefit from empiric CPAP or auto-titrating PAP.
• Guidelines recommend continuing home CPAP before and after surgery and monitoring patients closely.

In other words:
Surgery makes your sleep apnea worse—and CPAP protects you when you’re most vulnerable.

Reference (MLA):
Chung, Frances, et al. “CPAP in the Perioperative Setting: Evidence of Support.” Current Opinion in Anaesthesiology, vol. 29, no. 1, 2016, pp. 83–89. https://pmc.ncbi.nlm.nih.gov/articles/PMC5831563/.

Why CPAP Still Matters: The Physiology Behind Recovery

1. CPAP Restores Deep Sleep, Which Hospital Patients Desperately Need

OSA prevents slow-wave sleep (deep sleep) and REM sleep. Without these stages:

• Cortisol levels stay high
• Inflammation worsens
• Glucose control deteriorates
• Breathing becomes unstable
• Mental clarity declines

Sleep-deprived patients heal more slowly, get out of bed less, and are at higher risk for delirium and pressure wounds.

CPAP restores these sleep stages even on the first night of use.

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2. No CPAP → High Cortisol → Slower Healing

When OSA is untreated, the brain never gets into restorative sleep. This keeps cortisol elevated day and night. High cortisol:

• Raises blood pressure
• Worsens blood sugar
• Weakens immunity
• Slows tissue repair
• Increases catabolism

During illness, the last thing you want is more cortisol.

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3. No CPAP → Worse Blood Sugar

Even one night of poor sleep causes insulin resistance.

Hospitalized patients without CPAP essentially experience forced sleep deprivation, which:

• Raises glucose
• Slows wound healing
• Increases infection risk
• Worsens mental status

This explains why many hospitalized diabetics have higher glucose levels than expected.

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4. No CPAP → Dangerous Bradycardia and Arrhythmias

Apneas cause:

• Hypoxia
• CO₂ retention
• Large intrathoracic pressure swings
• Vagal surges

This can lead to:

• Sinus bradycardia (HR 30s–40s)
• Sinus pauses
• AV block
• Irregular breathing

Reapplying CPAP often improves heart rate within minutes—exactly what happened to my friend.

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5. CPAP Helps Patients Wake, Eat, Mobilize, and Participate in Recovery

Untreated OSA makes patients:

• Lethargic
• Confused
• Hard to arouse
• Unable to eat
• Unable to cooperate with therapy

As soon as CPAP restores stable breathing and sleep, the patient becomes more alert and able to take part in essential self-care.

6. Long-Term CPAP Adherence Reduces Readmissions and Hospital Utilization

While short hospital stays may not show dramatic differences in outcomes, long-term studies tell a clearer story. In large nationally representative samples of older Medicare beneficiaries:

• High CPAP adherers had ~60% lower odds of 30-day hospital readmission compared to low adherers (OR 0.41, 95% CI 0.24–0.70).¹
• Over 24 months, high adherers had significantly fewer inpatient hospitalizations, showing a measurable reduction in healthcare utilization and clinical instability.²

This means that consistent CPAP use — both at home and in the hospital — is strongly associated with better long-term outcomes and fewer disruptions to health.

Hospitalization should therefore never interrupt CPAP therapy. Instead, it should reinforce its importance.

References:

1. Bailey MD, Wickwire EM, Somers VK, Albrecht JS. Adherence to continuous positive airway pressure reduces the risk of 30-day hospital readmission among older adults with comorbid obstructive sleep apnea and cardiovascular disease. J Clin Sleep Med. 2022 Dec 1;18(12):2739-2744. doi: 10.5664/jcsm.10196. PMID: 35934923; PMCID: PMC9713924. https://pmc.ncbi.nlm.nih.gov/articles/PMC9713924/.
2. Wickwire EM, Bailey MD, Somers VK, Oldstone LM, Srivastava MC, Johnson AM, Scharf SM, Albrecht JS. CPAP adherence is associated with reduced inpatient utilization among older adult Medicare beneficiaries with pre-existing cardiovascular disease. J Clin Sleep Med. 2022 Jan 1;18(1):39-45. doi: 10.5664/jcsm.9478. PMID: 34170251; PMCID: PMC8807906. https://pmc.ncbi.nlm.nih.gov/articles/PMC8807906/.

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Can You Use CPAP If You Are On Oxygen? Absolutely Yes.

This is a common concern. The answer is simple:

CPAP and oxygen can be used together safely.

Oxygen is “bled in” through a small adapter into the CPAP tubing.

• CPAP keeps the airway open
• Oxygen increases the oxygen concentration
• They do not interfere with one another

This combination is commonly used for:

• COPD + OSA overlap
• Obesity hypoventilation
• Heart failure
• Postoperative patients
• Pneumonia with mild hypoxemia

In fact, in some patients, oxygen without CPAP is dangerous, because it can worsen CO₂ retention. CPAP + oxygen is safer.

Reference (MLA):
Mehta V, Vasu TS, Phillips B, Chung F. Obstructive sleep apnea and oxygen therapy: a systematic review of the literature and meta-analysis. J Clin Sleep Med. 2013 Mar 15;9(3):271-9. doi: 10.5664/jcsm.2500. PMID: 23493498; PMCID: PMC3578679. https://pmc.ncbi.nlm.nih.gov/articles/PMC3578679/

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Practical Advice for Patients with OSA Who Are Hospitalized

• Bring your CPAP device and mask from home. Hospital-issued CPAP machines may be available, but the mask may not fit well or seal properly—leading to discomfort, air leaks, and poor sleep quality.
• Request that the attending physician formally approve the use of your home CPAP.
  Hospitals often require an order from the attending before CPAP can be applied, even if it is your own machine. This step ensures:
  • Nursing staff are authorized to help you set it up
  • Respiratory therapy can assist as needed
  • The device is documented in your treatment plan
• Tell every nurse and doctor: “I use CPAP every night at home.” Do not assume the staff already knows.
• Ask respiratory therapy to set up oxygen bleed-in if oxygen is required.
• Avoid sedatives, opioids, and benzodiazepines when possible, as these relax the airway and worsen apnea.
• Sleep on your side or with the head of the bed elevated.
• Ask for help with repositioning to prevent pressure injuries, especially if you are too lethargic to move independently.
• If you feel unusually sleepy, confused, or short of breath, insist on using your CPAP. These may be signs of untreated apneas, CO₂ retention, or worsening oxygenation.

Additional Practical Advice for Patients Undergoing Surgery

• Bring your CPAP on the day of surgery, including mask and tubing.
• Inform your anesthesiologist and surgeon that you use CPAP nightly.
• Use your CPAP the night before and as soon as you are awake after surgery.

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Conclusion

Even though a 2016 study found no reduction in length of stay or hospital mortality with CPAP use, the physiologic benefits are undeniable.

CPAP:

• Restores deep sleep
• Reduces cortisol
• Stabilizes breathing
• Improves blood sugar
• Prevents bradycardia
• Enhances alertness.
• Supports faster recovery

More importantly:
It prevents the kind of deterioration that hospitalized OSA patients can experience in just a few nights without therapy.

If you use CPAP at home, continue using it in the hospital.
Your brain, your heart, your metabolism, and your recovery depend on it.

Don’t Get Sick!

Medically Reviewed by Dr. Jesse Santiano, MD
Dr. Santiano is a retired internist and emergency physician with extensive clinical experience in metabolic health, cardiovascular prevention, and lifestyle medicine. He reviews all medical content on this site to ensure accuracy, clarity, and safe application for readers. This article is for educational purposes and is not a substitute for personal medical care.

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Related:

References:

• Chung, Frances, et al. “CPAP in the Perioperative Setting: Evidence of Support.” Current Opinion in Anaesthesiology, vol. 29, no. 1, 2016, pp. 83–89.
• U.S. National Library of Medicine, https://pmc.ncbi.nlm.nih.gov/articles/PMC5831563/.

Disclaimer:
This article is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician before making health decisions based on the TyG Index or other biomarkers.

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