Can’t Sleep Well? We’re Here to Help
If your doctor has mentioned that your sleep apnea and atrial fibrillation may be connected, you’re not imagining things—and you’re not alone. Research now shows that sleep apnea and AFib co-occur so frequently that cardiologists and sleep specialists consider them two parts of the same problem. Studies estimate that anywhere from 21% to 80% of AFib patients also have obstructive sleep apnea, and a significant portion of them have never been diagnosed or treated for it.
At the Center for Dental Sleep Health, our sleep apnea dentist in Nashua, NH, Dr. Stephen Ura, works with patients managing sleep apnea and its effects on overall health, including heart health. This guide covers everything you need to know: what AFib is, why sleep apnea makes it worse, what the latest research says about treatment, and what options are available to patients right here in Southern New Hampshire.
Call our Nashua dental office at (603) 886-4300 to schedule your consultation. We welcome new and returning patients from Nashua, Hudson, Merrimack, Milford, Bedford, Amherst, Manchester, and throughout Southern New Hampshire.
What Is Atrial Fibrillation (AFib)?
Atrial fibrillation is a heart rhythm disorder—specifically, an irregular and often rapid heartbeat that originates in the heart’s upper chambers (the atria). Instead of beating in a coordinated, efficient pattern, the atria fire chaotically, which can cause the heart to beat too fast, too slow, or unpredictably.
AFib affects an estimated 2.7 to 6.1 million Americans, and that number is growing. It’s the most common sustained cardiac arrhythmia in the world. While it isn’t always immediately life-threatening, untreated AFib significantly raises the risk of:
- Stroke: Blood that pools in the atria can clot, and those clots can travel to the brain
- Heart failure: The heart works less efficiently over time
- Cardiovascular complications: Including worsening hypertension and reduced quality of life.
AFib comes in different forms: paroxysmal AFib comes and goes on its own; persistent AFib lasts longer and requires intervention to restore normal rhythm; and long-standing persistent and permanent AFib are more chronic presentations. The type of AFib matters when it comes to treatment—and, as we’ll cover below, when it comes to sleep apnea’s role.
Symptoms of AFib: What to Watch For
AFib symptoms range from barely noticeable to severely disruptive. Some people discover they have it only during a routine ECG. Others’ experience:
- Heart palpitations: A fluttering, pounding, or racing sensation in the chest
- Irregular heartbeat: A heartbeat that feels “off” or skipped
- Fatigue or weakness: Often disproportionate to activity level
- Shortness of breath: Especially during exertion or lying flat
- Chest discomfort: Pressure, tightness, or pain
- Dizziness or lightheadedness
- Near-fainting or fainting episodes
- Anxiety or a vague sense that something is wrong
One of the most important things to understand: AFib and sleep apnea share many overlapping symptoms. Fatigue, poor sleep, morning headaches, and even mood changes can stem from either condition—or both. If you’ve been told you snore loudly, wake up unrefreshed, or have been observed to stop breathing during sleep, it’s worth considering that sleep apnea may be amplifying your heart symptoms.
AFib Risk Factors
Some risk factors for AFib are fixed: age, family history, and genetics. Others are modifiable, and that’s where informed action matters most. Common risk factors include:
- Age: Risk rises significantly after 60
- High blood pressure (hypertension): Damages the heart over time and increases arrhythmia risk
- Heart disease: Including coronary artery disease and prior heart attack
- Thyroid conditions: Both hyper- and hypothyroidism can disrupt heart rhythm
- Diabetes: Damages cardiovascular tissue and increases arrhythmia susceptibility
- Obesity: Excess weight strains the heart and is strongly linked to both AFib and sleep apnea
- Excessive alcohol use: Even moderate binge drinking can trigger AFib episodes (sometimes called “holiday heart”)
- Smoking: Accelerates cardiovascular damage
- Sleep apnea: A major, often underrecognized, and treatable risk factor for AFib
That last one deserves its own section.
The Real Connection Between Sleep Apnea and AFib
This is where it gets important — and where most explanations fall short.
The relationship between obstructive sleep apnea (OSA) and AFib isn’t just a correlation. It’s mechanistic. Sleep apnea doesn’t just happen to occur alongside AFib; it actively creates the conditions in your heart and nervous system that make AFib more likely to develop — and harder to treat.
Here’s how:
- Intermittent Hypoxia (Oxygen Deprivation) Every time sleep apnea causes a breathing pause, your blood oxygen drops. Night after night, this repeated hypoxia triggers oxidative stress and inflammation throughout the cardiovascular system. These aren’t minor insults—they accumulate into structural changes in the heart.
- Negative Intrathoracic Pressure When you struggle to breathe against a blocked airway, your chest creates extreme negative pressure—like trying to suck air through a pinched straw. This mechanical force increases the workload on the heart’s chambers, stretches the atrial walls, and, over time, promotes the kind of atrial remodeling that sets the stage for arrhythmia.
- Autonomic Nervous System Disruption Sleep apnea throws your autonomic nervous system out of balance, increasing sympathetic (“fight or flight”) activation and disrupting the parasympathetic (“rest and digest”) regulation that normally keeps heart rate and rhythm stable. This dysfunction is a direct contributor to AFib susceptibility.
- Atrial Fibrosis and Remodeling Over time, the combined effects of hypoxia, mechanical stress, and autonomic dysfunction cause the atrial tissue itself to change — scarring, thickening, and losing its normal electrical properties. This atrial remodeling creates the substrate that sustains AFib. Research has confirmed that this is not reversible once it becomes advanced, which is exactly why early treatment of sleep apnea matters so much for AFib patients.
The bottom line: sleep apnea doesn’t just co-exist with AFib. It feeds it.
How Common Is the Overlap?
The numbers are striking. Research published in peer-reviewed cardiovascular journals has found that:
- Between 21% and 80% of AFib patients also have obstructive sleep apnea, with most estimates clustering around 50%
- Many of those patients have never been diagnosed or treated for sleep apnea, meaning their AFib is being managed without addressing one of its primary drivers
- Patients with undiagnosed sleep apnea are at higher risk for AFib recurrence even after aggressive heart treatment like catheter ablation
The prevalence is so high that sleep evaluation is now considered a critical component of comprehensive AFib care.
Does Treating Sleep Apnea Help AFib? What the Latest Research Says
This is the question most patients want answered—and the research is increasingly encouraging.
On AFib recurrence after catheter ablation: Catheter ablation is a procedure where doctors create targeted scar tissue in the heart to disrupt the abnormal electrical signals causing AFib. It’s become a first-line rhythm-control strategy for many patients. But for years, studies showed that sleep apnea patients had higher recurrence rates after ablation—suggesting their heart rhythms were harder to stabilize.
Recent research adds important nuance. A study found that among patients with paroxysmal (intermittent) AFib, those with untreated sleep apnea had significantly higher recurrence after ablation. However, long-term CPAP adherence—meaning sustained use for more than a year—was associated with substantially lower recurrence rates in the follow-up period. Patients who stuck with treatment saw their AFib recurrence rate drop meaningfully compared to those who didn’t.
A separate study confirmed that positive airway pressure therapy is associated with lower rates of AFib recurrence after both cardioversion and catheter ablation—reinforcing that treating sleep apnea is not just good for sleep; it’s good for your heart rhythm long-term.
On hospitalization and health care costs: A study found that AFib patients who adhered to PAP therapy had significantly fewer emergency department visits and hospitalizations compared to those who didn’t comply with treatment. Managing sleep apnea wasn’t just medically beneficial—it was economically significant, too.
The takeaway: Treating sleep apnea won’t necessarily cure AFib, but the evidence strongly suggests it reduces AFib burden, improves outcomes after cardiac procedures, and lowers the risk of life-threatening complications. If you have both conditions, managing sleep apnea is part of managing your heart—not a separate issue.
Diagnosing Both Conditions
Diagnosing Sleep Apnea
Sleep apnea is diagnosed through a sleep study—either a full in-lab polysomnography (PSG) or a home sleep apnea test (HSAT). During the study, breathing patterns, oxygen levels, brain activity, and heart rate are monitored to determine the severity of sleep-disordered breathing. The key metric is the apnea-hypopnea index (AHI) — the number of breathing interruptions per hour.
For AFib patients, sleep evaluation is particularly important because many people with both conditions are not obviously sleepy during the day, making standard screening questionnaires less reliable. Objective testing is often essential to catch OSA in this population.
Dr. Ura’s Nashua office can help coordinate your path to a sleep study and evaluate you for oral appliance therapy once a diagnosis is confirmed.
Diagnosing AFib
AFib is diagnosed primarily through an electrocardiogram (ECG or EKG), which records the heart’s electrical activity. Because AFib can be intermittent, extended monitoring with a Holter monitor or implantable cardiac monitor may be used to capture episodes that don’t show up on a standard ECG. Echocardiograms and blood tests (including thyroid panels) are often part of a full workup.
Treatment Options for Sleep Apnea and AFib
Sleep Apnea Treatments
CPAP Therapy
Continuous positive airway pressure (CPAP) is the most commonly prescribed treatment for moderate-to-severe sleep apnea. It works by delivering a constant stream of pressurized air through a mask, keeping the airway open throughout the night. CPAP is highly effective when patients use it consistently.
The challenge? CPAP adherence is notoriously difficult. Studies consistently show that a significant percentage of patients don’t use their CPAP regularly enough to achieve therapeutic benefit, which is particularly problematic for AFib patients who need sustained treatment to protect their heart rhythm.
Oral Appliance Therapy (OAT)
For patients who struggle with CPAP — or who want a more comfortable, travel-friendly alternative — oral appliance therapy offers a clinically validated option. Custom-fitted by a qualified dental sleep medicine provider like Dr. Ura, these appliances gently reposition the lower jaw to keep the airway open during sleep.
For AFib patients specifically, oral appliance therapy may offer a practical advantage: if you’re more likely to actually use your sleep apnea treatment every night, you’re more likely to achieve the consistent, sustained treatment that research shows makes a difference in AFib outcomes. A treatment you use beats a treatment you don’t.
Surgical Options
Surgery is generally reserved for severe cases that don’t respond to other treatments. Options range from procedures to address structural airway issues to more involved upper airway surgery.
AFib Treatments
- Medications: Beta-blockers, calcium channel blockers, and anticoagulants help control heart rate, restore rhythm, and reduce stroke risk.
- Cardioversion: An electric shock procedure to restore normal sinus rhythm.
- Catheter ablation: Targeted destruction of the abnormal heart tissue driving the arrhythmia; increasingly effective, especially when combined with sleep apnea management.
- Surgery: Reserved for complex or refractory cases.
Oral Appliance Therapy: A CPAP Alternative Worth Knowing About
If you’ve been prescribed CPAP and find it difficult to tolerate, or if you’re newly diagnosed with sleep apnea and want to understand all your options, oral appliance therapy is worth a serious conversation.
At the Center for Dental Sleep Health, Dr. Stephen Ura specializes in custom oral appliances for sleep apnea patients. These are not over-the-counter mouthguards. They are precision-fitted, adjustable devices that have been clinically studied and recognized by the American Academy of Sleep Medicine as an effective treatment for obstructive sleep apnea.
For AFib patients, this matters because the link between sleep apnea treatment and improved AFib outcomes depends on consistent use. If your CPAP sits on your nightstand because you can’t tolerate the mask, the pressure, or the noise, your heart isn’t getting the protection it needs. Many patients who switch to or start with an oral appliance find they use it every single night — which is exactly what the research supports for long-term AFib management.
If you’ve had a catheter ablation or cardioversion and want to protect your results, ask your cardiologist about a sleep apnea evaluation and ask us about oral appliance options.
Lifestyle Changes That Help Both Conditions
Medical treatment is essential—but lifestyle plays a meaningful supporting role. Changes that benefit both sleep apnea and AFib include:
- Weight Management: Excess weight worsens airway obstruction and strains the heart; even modest weight loss can meaningfully reduce sleep apnea severity and AFib burden
- Limiting Alcohol: Alcohol relaxes the airway muscles (worsening apnea) and is a known AFib trigger, especially in larger amounts
- Quitting Smoking: Smoking accelerates cardiovascular damage and worsens airway inflammation
- Sleeping on Your Side: Positional sleep apnea is common; back sleeping allows the tongue and soft tissue to fall back and obstruct the airway
- Managing Blood Pressure: Hypertension is a shared risk factor; controlling it benefits both conditions
- Stress Reduction: Yoga, meditation, and regular exercise can reduce sympathetic nervous system overactivation, which benefits both heart rhythm and sleep quality
- Treating underlying conditions: Thyroid disorders and diabetes, if present, should be actively managed
These aren’t substitutes for treatment—they’re amplifiers. The patients who do best are typically the ones who combine appropriate medical or dental therapy with consistent lifestyle support.
Frequently Asked Questions
Can sleep apnea cause AFib?
Yes, and the evidence is substantial. Obstructive sleep apnea triggers a cascade of mechanisms—repeated oxygen drops, mechanical stress on the heart, autonomic dysfunction, and chronic inflammation—that together promote the atrial remodeling that underlies AFib. It’s now considered one of the most important modifiable risk factors for developing and perpetuating atrial fibrillation.
Will treating my sleep apnea help my AFib?
It can, and in many cases significantly so. Multiple studies have shown that patients with AFib who treat their sleep apnea consistently—particularly with sustained CPAP or oral appliance use—have better AFib outcomes, lower recurrence rates after procedures like catheter ablation, and fewer hospitalizations. The keyword is consistent: short-term or irregular treatment offers less benefit.
Is CPAP the only option for AFib patients with sleep apnea?
No. Oral appliance therapy — custom-fitted by a dental sleep medicine specialist — is a clinically validated CPAP alternative for mild-to-moderate sleep apnea. For many patients, especially those who find CPAP intolerable, an oral appliance is the more practical path to consistent nightly treatment. If you’re in the Nashua, NH area, Dr. Ura can evaluate whether you’re a candidate.
I had a catheter ablation. Do I still need to treat my sleep apnea?
Yes—arguably more than ever. Research shows that untreated sleep apnea is one of the primary reasons AFib recurs after catheter ablation. Sustained sleep apnea treatment (particularly more than one year of use) is associated with significantly lower very late recurrence rates. Protecting your ablation results means protecting your sleep health.
Does sleep apnea increase stroke risk in AFib patients?
Yes. Sleep apnea independently predicts stroke risk in AFib patients, above and beyond the stroke risk from AFib itself. Since AFib already raises stroke risk (by promoting blood clot formation), the addition of untreated sleep apnea compounds this danger. Both conditions together create a more urgent case for comprehensive management.
Can a dentist really help with AFib and sleep apnea?
A dental sleep medicine specialist doesn’t treat AFib directly—that’s your cardiologist’s role. But because oral appliance therapy is a primary treatment for obstructive sleep apnea, and because managing sleep apnea is now understood to be integral to good AFib outcomes, the right sleep dentist is a meaningful part of your care team. Dr. Ura works collaboratively with patients’ physicians to ensure treatment is coordinated and effective.
Protect Your Heart. Treat Your Sleep.
The connection between sleep apnea and atrial fibrillation is no longer a footnote—it’s central to how both conditions are understood and managed. If you have AFib, finding out whether you also have sleep apnea isn’t optional; it’s part of a complete cardiac workup. If you have sleep apnea, treating it isn’t just about sleeping better — it’s about protecting your heart from one of the most common and preventable arrhythmias in the world.
Dr. Stephen Ura and the team at the Center for Dental Sleep Health are here to help you take that step. We provide personalized oral appliance therapy for sleep apnea patients in Nashua, NH, and surrounding communities, working alongside your cardiologist, primary care physician, and sleep specialist to give you the most comprehensive care possible.
Call our Nashua dental office at (603) 886-4300, or fill out our online contact form to schedule your consultation. Patients from Hudson, Merrimack, Milford, and the greater Nashua area are always welcome.
Your new life begins today.