What is sleep apnea? Signs most people miss

The signs people skip are often not in the bedroom. Resistant blood pressure, atrial fibrillation, getting up to urinate, and a partner who already knows the breathing stops can be the reason to test, even when you do not think of yourself as sleepy. Questionnaires cannot make the diagnosis. The 2017 AASM diagnostic guideline says clinical tools, questionnaires, and prediction algorithms should not be used to diagnose adult OSA in the absence of a sleep study. This page is not a second “what is sleep apnea” explainer. That page already exists.

If you already know about snoring, what is left?

Loud snoring, witnessed gasping, and nodding off in traffic are the brochure symptoms. They still matter. They are also the symptoms people who do not snore, or who sleep alone, never get asked. The Kapur 2017 remarks define “increased risk of moderate to severe OSA,” for the purpose of choosing a home test, as excessive daytime sleepiness plus at least two of: habitual loud snoring, witnessed apnea or gasping or choking, or diagnosed hypertension. Hypertension is already on that short list. The rest of cardiology has added resistant hypertension and atrial fibrillation as reasons to take a sleep history. Those are the misses this article is for.

The practice’s sleep apnea condition page covers how diagnosis and treatment work. Use that for the disease overview. Use this page if your internist is treating blood pressure, your cardiologist is treating AF, or your partner has moved to the guest room, and no one has ordered a study because you scored “fine” on a printout in the waiting room.

Why is a STOP-BANG score not a diagnosis?

Kapur recommendation 1 is strong: do not use clinical tools, questionnaires, or prediction algorithms to diagnose OSA in adults without polysomnography or home sleep apnea testing. The task force looked at Berlin, Epworth, STOP-BANG, neck-circumference tricks, and multivariable scores. In clinic populations, they misclassified too many people. The upper range of predicted false negatives per 1,000 patients exceeded 100 for the models they judged, a number the task force called clearly excessive for a stand-alone diagnostic test.

STOP-BANG is sensitive and not specific. Kapur’s pooled figures for STOP-BANG against PSG included sensitivity around 0.90 to 0.95 with specificity around 0.36 at common cutoffs, depending on the AHI threshold. That pattern is a screening net, not a diagnosis. Epworth measures self-reported dozing, not obstruction. You can have severe OSA and an Epworth of 6. You can have insomnia, a high Epworth, and a normal AHI.

A STOP-BANG worksheet is still a reasonable way to decide whether to pick up the phone. It is a terrible way to decide you do not have apnea. Kapur’s good-practice statements put testing next to a comprehensive sleep evaluation, not next to a score that “looked low.”

What does resistant blood pressure have to do with it?

The 2021 American Heart Association scientific statement on OSA and cardiovascular disease recommends screening for OSA in patients with resistant or poorly controlled hypertension. The statement notes that 30 to 50 percent of hypertensive patients have comorbid OSA, and that among people with resistant hypertension, up to 80 percent may have OSA, citing clinic series such as Logan 2001. “Resistant” in this usage is blood pressure that stays above goal on multiple agents, including a diuretic, not a single high reading at an urgent-care kiosk.

Javaheri’s 2017 JACC review treats OSA as a cause of systemic hypertension, with a stronger observational signal in resistant disease. Randomized CPAP trials show blood-pressure drops that are real and modest: on the order of 2 to 2.5 mm Hg systolic and 1.5 to 2 mm Hg diastolic in broader hypertensive OSA groups, and larger (about 4.7 to 7.2 mm Hg systolic) in some resistant-hypertension analyses. Those are not reasons to promise that PAP will replace an antihypertensive. They are reasons that a blood-pressure clinic should ask about snoring and witnessed pauses instead of adding a fourth drug with no sleep history.

If your medicines have stacked up and no one has asked whether you stop breathing at night, that gap is the missed sign. The next step is sleep testing, not another questionnaire in the cardiology waiting room.

Why do AF clinics keep finding apnea?

The same AHA statement puts recurrent atrial fibrillation after cardioversion or ablation on the short list for OSA screening. It also states the limit of the evidence: OSA is an independent risk factor for AF in patients without other underlying cardiac disorders, OSA and AF share risk factors, and it has not been definitively proven that OSA causes AF. Mechanisms on the table include hypoxia, swings in intrathoracic pressure, sympathetic surges, and atrial remodeling. Observational work, including ORBIT-AF (a registry of more than 10,000 patients with AF and OSA, as cited in the AHA statement), associates CPAP use with less progression to permanent AF. Those studies are not SAVE-style randomized proof. They are still a reason an electrophysiology clinic should ask about snoring instead of assuming the atrium is the whole story.

For a patient, the practical reading is narrower. If you have been cardioverted or ablated and the AF came back, a sleep history (ideally with a bed partner) is part of the workup the AHA writing group wants cardiology to do. Palpitations at 3 a.m. are not a substitute for a scored study, and a scored study is not a substitute for anticoagulation decisions. The two clinics should share the tracing.

People who feel “fine” in the daytime still belong in this paragraph. SAVE enrolled people with established cardiovascular disease and often little sleepiness. Feeling rested does not settle the AF question.

Why does getting up to urinate keep showing up?

Nocturia is on the AASM’s own list of symptoms that can impair sleep-related quality of life in the Patil 2019 PAP guideline remarks, alongside snoring, choking, insomnia, morning headaches, and a wrecked bed partner’s sleep. Negative intrathoracic pressure, atrial stretch, and natriuretic peptide release are the physiology textbooks use to connect obstructive events to nighttime urine production. You do not need a urology diagnosis first. You need someone to notice that three trips to the bathroom clustered with snoring and dry mouth, and to stop calling it “just getting older.”

Plenty of nocturia is prostate disease, diuretics timed at 8 p.m., uncontrolled diabetes, or drinking a bottle of water at bedtime. The miss is treating only those and never asking whether the sleep is broken by apneas. A urologist who starts an anticholinergic without a sleep history in a hypertensive snorer has skipped a reversible contributor. A sleep lab that never asks about nocturia has skipped a symptom patients will actually report. Nighttime trips that cluster with gasping, dry mouth, and a headache are a different pattern from one planned bathroom stop after an evening pill. We will not invent a prevalence percentage we did not open a paper for. We will ask the question, because Patil already put nocturia on the quality-of-life list and because patients mention it when someone lets them.

What if the only historian is the person in the other bed?

The AHA statement says a sleep history should ideally be taken with assistance from a bed partner, covering snoring, gasping or snorting, frequent awakening, and sleepiness. Witnessed apnea is one of Kapur’s three companion criteria for “increased risk of moderate to severe OSA.” People who sleep alone, and people whose partners have already left the room, lose that data. Ask the partner before the visit, or bring them. A secondhand description of breathing that stops and then snorts back is often more accurate than your own story of “I sleep fine.”

Women can present with insomnia, fatigue, and mood symptoms more than with classic snoring. That pattern has its own article. The point here is only that an atypical daytime complaint plus a partner’s report still needs a study, not a lower index of suspicion.

If any of this sounds like your chart (resistant hypertension, AF, nocturia, a partner who is done being polite) call Westerville Sleep Center at (614) 898-9340. We will not diagnose you from a form. We will decide whether a home test or a lab night is the right first recording.