What Untreated Sleep Apnea Does to Your Heart: A Sleep Physician Explains

‍

Shana Hansen, MD, Board-Certified Sleep Medicine Physician, Lucid Sleep Experts

If you snore, wake up exhausted, or have been told you stop breathing in your sleep, you have probably wondered whether it really matters. Maybe your bed partner has been nudging you for years. Maybe your blood pressure keeps creeping up no matter what you do. Maybe you just feel like your body is working harder than it should.

I want to tell you something I share with my patients in San Antonio and Kerrville every week: snoring is the loud part of sleep apnea. The damage it does to your heart is the silent part. And the silent part is the one that concerns me most as a sleep physician.

The good news is that this is a solvable problem. Sleep apnea is one of the most treatable conditions in all of medicine, and understanding what it does to your cardiovascular system is the first step toward protecting yourself.

‍

Your Heart Never Gets a Night Off

Here is what happens inside your body during an apnea event.

Your airway collapses or narrows. Airflow stops or becomes shallow. The oxygen level in your blood begins to fall. Your brain, sensing an emergency, releases a surge of adrenaline and other stress hormones to jolt your body just enough to reopen the airway. Your heart rate jumps. Your blood pressure spikes. Then you drift back toward deeper sleep, and the cycle begins again.

For someone with moderate to severe obstructive sleep apnea, this can happen 15, 30, even more than 60 times per hour. Over the course of a night, that can mean hundreds of oxygen drops and hundreds of adrenaline surges. Night after night. Year after year.

Sleep is supposed to be when your cardiovascular system rests. Blood pressure normally dips during healthy sleep, giving your heart and blood vessels a recovery period. Untreated sleep apnea takes that recovery period away and replaces it with a nightly stress test your heart never signed up for.

‍

‍

If you suspect sleep apnea, do not wait for a wake-up call from your heart. Schedule a consultation with Lucid Sleep Experts and we will guide you from a simple home sleep test to a treatment plan built around your life.

‍

What Research Tells Us About Untreated Sleep Apnea and Heart Disease

I never want to scare patients. I do want to inform them, because the research here is extensive and consistent.

Sleep apnea and heart disease overlap far more than most people realize. According to a scientific statement from the American Heart Association, obstructive sleep apnea is present in 40 to 80 percent of people with cardiovascular disease, yet it remains under-recognized and undertreated in cardiovascular care (1). Think about that. In a cardiology waiting room, sleep apnea may be the most common condition in the room, and most of the people who have it do not know.

Untreated sleep apnea is linked to significantly higher cardiovascular risk. Research compiled in systematic reviews has associated obstructive sleep apnea with a 140 percent increase in the risk of heart failure, a 60 percent increase in the risk of stroke, and a 30 percent increase in the risk of coronary heart disease (2). Meta-analyses have linked sleep apnea to nearly double the risk of cardiovascular disease, stroke, and death from any cause (3).

The risk starts earlier than you think. A large Danish nationwide study published in the Journal of the American Heart Association followed patients age 50 and younger who were diagnosed with sleep apnea. Even in this young group, the risk of a cardiovascular event and the risk of death from any cause were both nearly double compared to similar people without sleep apnea (4). Sleep apnea is not just a disease of older adults, and its cardiac consequences do not wait for retirement age.

Landmark studies have confirmed the danger for years. A study published in the New England Journal of Medicine found that obstructive sleep apnea independently increased the risk of stroke or death, and that the risk climbed as the apnea became more severe (5). A long-term observational study of men followed for more than a decade found that untreated severe sleep apnea carried nearly triple the odds of a fatal cardiovascular event (6).

Even the timing of heart emergencies changes. In the general population, heart attacks and sudden cardiac death cluster in the morning hours. In people with obstructive sleep apnea, research published in the New England Journal of Medicine found the pattern shifts, with sudden cardiac death occurring disproportionately during sleeping hours, between midnight and 6 a.m. (7). The events happening in your airway at night are not staying in your airway.

‍

How Sleep Apnea Strains the Cardiovascular System

High Blood Pressure

This is the most established connection. Sleep apnea affects an estimated 30 to 50 percent of people with high blood pressure, and the number climbs even higher in people whose blood pressure resists medication (1). The Wisconsin Sleep Cohort, one of the foundational studies in my field, showed that sleep-disordered breathing predicted the development of hypertension years later (8). If you are taking multiple blood pressure medications and your numbers still will not budge, a sleep evaluation should be on your list. The American Heart Association specifically recommends screening for sleep apnea in patients with resistant or poorly controlled hypertension (1).

Atrial Fibrillation

AFib is an irregular, often rapid heart rhythm that raises stroke risk. Sleep apnea and AFib travel together so frequently that the American Heart Association recommends sleep apnea screening for patients with recurrent atrial fibrillation, particularly those whose AFib returns after cardioversion or ablation procedures (1). The repeated oxygen drops, pressure swings inside the chest, and adrenaline surges of untreated apnea create exactly the kind of electrical and structural stress that makes the heart's upper chambers misfire.

Heart Failure

The 140 percent figure I mentioned earlier deserves its own explanation. Heart failure does not mean the heart stops. It means the heart can no longer pump efficiently enough to meet the body's needs. Every apnea event forces the heart to pump against spiking blood pressure while starved of oxygen. Over years, that workload contributes to the thickening and stiffening that lead to heart failure, and sleep apnea is associated with worse outcomes in people who already have it (1).

Coronary Artery Disease and Heart Attack

The same nightly cascade of low oxygen, inflammation, and blood pressure surges accelerates the process of atherosclerosis, the buildup of plaque inside the arteries that feed the heart itself. Research has associated sleep apnea with roughly a 30 percent higher risk of coronary heart disease (2), and studies of patients undergoing coronary procedures have found untreated moderate to severe sleep apnea predicts future major cardiac events (3).

Stroke

More than 60 percent of stroke patients have sleep apnea, compared with a small fraction of the general middle-aged population (5). Most of them were never diagnosed before their stroke. This is one of the statistics that motivates me most, because a stroke is often the first moment anyone thinks to ask about sleep.

‍

You Do Not Have to Figure This Out Alone

If you have read this far and recognized yourself, your spouse, or a parent in these paragraphs, take a breath. Here is the part of the story where things turn around.

At Lucid Sleep Experts, my role as your sleep physician is to take this off your shoulders. You do not need to interpret studies, decode insurance rules, or guess whether your snoring is "bad enough." That is our job. Our team has helped patients across San Antonio, Kerrville, and the Texas Hill Country move from worried and exhausted to diagnosed and treated, and we have built our entire process to make that path simple.

‍

Three Steps From Uncertainty to Answers

Step 1: Take a home sleep test. For most patients, diagnosis no longer requires a night in a lab. We provide a small, comfortable device you wear in your own bed for one or two nights. It records your breathing, oxygen levels, and heart rate while you sleep where you always sleep.

Step 2: Review your results with a sleep physician. I personally review your study and sit down with you to explain exactly what is happening during your sleep, how severe it is, and what it means for your heart and your health. A physician-ordered sleep study and diagnosis always come before any treatment decision.

Step 3: Get treatment fitted to your life. CPAP remains the first-line therapy for severe obstructive sleep apnea, and for many patients it works beautifully once it is set up and supported correctly. For patients who cannot tolerate CPAP, or for many with mild to moderate apnea, custom oral appliance therapy delivered by our dental sleep medicine team, led by Tiffini Stratton, DDS, a Diplomate of the American Board of Dental Sleep Medicine, offers an effective, comfortable alternative. Treatment addresses the root of the problem: it keeps your airway open so the oxygen drops and adrenaline surges stop disrupting your nights.

‍

What Success Looks Like

Patients often come back after a few weeks of effective treatment and tell me some version of the same thing. They forgot what it felt like to wake up rested. Their bed partner is sleeping through the night again. Their energy is back. Their morning headaches are gone.

Just as importantly, treating sleep apnea removes the nightly cardiovascular stress I described above and gives you and your medical team a fair fight. Blood pressure becomes easier to manage. Your cardiologist is working with a heart that finally gets to rest at night. You are no longer leaving a major, modifiable risk factor unaddressed while working hard on all the others.

‍

What Failure Looks Like

I will be honest about the alternative, because you deserve honesty. Untreated sleep apnea does not stay the same. The risks compound quietly, and for too many people, the first unmistakable symptom of years of untreated apnea is a cardiac event. I would much rather meet you in my clinic than have a hospitalist meet you after a stroke or heart attack that might have been influenced by a condition we could have identified with one night of testing.

‍

Frequently Asked Questions

I snore but I feel fine during the day. Should I still get tested? Possibly, yes. Daytime sleepiness is common in sleep apnea but not universal. Many patients, especially women, present with fatigue, morning headaches, mood changes, or stubborn high blood pressure instead of classic sleepiness. Loud snoring with witnessed pauses in breathing warrants an evaluation regardless of how you feel during the day.

Does treating sleep apnea cure heart disease? No single therapy cures heart disease, and I am careful not to overpromise. What treatment does is eliminate the nightly cycle of oxygen drops and blood pressure surges that sleep apnea inflicts on your cardiovascular system, and it improves the intermediate markers that matter, like nighttime blood pressure and oxygen levels (1). Managing sleep apnea is one important piece of comprehensive cardiovascular care alongside the plan you build with your physician.

I have AFib or high blood pressure. Should I mention sleep to my cardiologist? Absolutely. The American Heart Association specifically recommends sleep apnea screening for patients with resistant hypertension and recurrent atrial fibrillation (1). Many of our patients are referred by their cardiologist or primary care provider, and we send results and treatment plans back to your referring physician so your whole care team is aligned.

What if I cannot tolerate CPAP? You have options. Before giving up on CPAP, small adjustments to pressure settings, mask fit, and humidity solve many problems. If CPAP truly is not workable for you, custom oral appliance therapy is an established alternative for appropriate candidates, and our practice offers both under one roof.

Does insurance cover testing and treatment? In most cases, yes. Home sleep testing and sleep apnea treatment are covered by most plans, and we accept Medicare and TRICARE. Our benefits team verifies your coverage and explains your costs before you commit to anything.

‍

Your Heart Is Asking for a Full Night's Rest. Give It One.

You did not choose sleep apnea, but you can choose what happens next. One night of testing in your own bed can answer a question your heart has been asking for years.

Request an appointment at lucidtx.com or call our San Antonio or Kerrville office. We will take it from there.

Shana Hansen, MD, is a board-certified sleep medicine physician and the Medical Director of Lucid Sleep Experts, with locations in San Antonio and Kerrville, Texas. Lucid Sleep Experts provides physician-led diagnosis and full-spectrum treatment of obstructive sleep apnea, including home sleep testing, CPAP management, and custom oral appliance therapy.

This article is for educational purposes only and is not a substitute for medical advice. Treatment decisions should be made together with your physician. Lucid Dental, PA and Lucid Sleep Doctors PLLC, doing business as Lucid Sleep Experts.

‍

References

‍