Unraveling Sleep Apnea: A Medical Doctor's Journey to Understanding the Complexity of Sleep Medicine
When patients with uncontrolled hypertension weren't responding to treatment in Louisiana's "stroke belt," Dr. David McCarty began noticing a pattern. Behind their stubborn blood pressure readings lurked an often-overlooked culprit: sleep apnea. This discovery launched the internal medicine physician on a journey to demystify one of healthcare's most complex conditions, one that sits at the intersection of dental and medical practice.
In a recent conversation with Dr. Kelly Tanner on The Dental Handoff podcast, Dr. McCarty shared insights from his evolution from a primary care physician to a sleep medicine specialist, revealing how dental professionals play a crucial role in addressing this widespread condition.
From English Major to Sleep Medicine Pioneer
Dr. McCarty's path to medicine wasn't straightforward. After graduating from the University of Virginia as an English major (and self-described "swimming major" as a collegiate athlete), he spent a year bartending before realizing he wanted more meaningful work.
"I wanted to feel like Hawkeye Pierce, like Marcus Welby," he explains, referencing iconic television doctors. "I wanted to be that guy who helped people."
After completing medical school at Duke and his internal medicine residency at Massachusetts General Hospital, Dr. McCarty began practicing primary care. But something was missing from his training: knowledge about sleep.
"There wasn't that much curriculum about sleep and what it's for," he notes. This gap became personally relevant during his residency's demanding schedule of being on call every third night. "If one day of sleep deprivation can make me feel this lousy, I began to reflect on what happens if your sleep is destroyed every night?"
The Sleep Apnea-Hypertension Connection
While practicing in Shreveport, Louisiana—part of the "stroke belt" known for high rates of hypertension, Dr. McCarty encountered patients whose blood pressure remained difficult to control despite medication. This coincided with emerging research connecting sleep apnea to treatment-resistant hypertension.
"I start sending these sleep studies, and before you know it, you realize with a little bit of paying attention that this problem is everywhere," he explains. "It's a little bit scary because you realize you're not prepared for the answer."
This realization led Dr. McCarty to develop frameworks to help both patients and providers understand and navigate sleep disorders without getting overwhelmed by their complexity.
Breaking Down Complexity: The Five-Finger Approach
Dr. McCarty's first framework, published in the Journal of Clinical Sleep Medicine in 2010, is what he calls the "Five-Finger Approach"—a diagnostic tool for exploring sleep complaints:
Circadian Misalignment: Mismatches between the body's internal clock and sleep opportunity
Pharmacologic Influences: How medications, caffeine, tobacco, THC, and other substances affect sleep
Medical Factors: How conditions like chronic pain impact sleep quality
Psychosocial and Psychiatric Issues: Mental health considerations that influence sleep
Primary Sleep Diagnoses: Formal sleep disorders diagnosed at sleep clinics, including sleep apnea
This holistic approach prevents providers from immediately jumping to sleep apnea as the diagnosis when other factors might be contributing to or causing sleep disturbances.
The Five Reasons to Treat
Dr. McCarty's second framework focuses on the "Five Reasons to Treat" sleep apnea:
Risk: Understanding different risk profiles between obstructive and central sleep apnea
Snoring: Addressing the social impact of disruptive breathing
Sleep: Improving overall sleep quality
Wake: Enhancing daytime functioning and alertness
Comorbidities: Managing conditions connected to sleep apnea
This approach helps providers and patients move beyond simplistic categorizations of mild, moderate, and severe sleep apnea to address the specific factors most relevant to each individual.
The Two Flavors of Sleep Apnea
One of Dr. McCarty's most important insights is the distinction between obstructive and central sleep apnea—what he calls the "two flavors" that are often lumped together in diagnosis.
"The obstructive component is inherently a little more stressful and potentially destructive than the central sleep apnea component," he explains. While obstructive sleep apnea involves physical blockage of the airway (essentially "choking" during sleep), central sleep apnea involves dysregulation of breathing patterns without physical obstruction.
The challenge? When patients receive a diagnosis of "sleep apnea," it's often unclear how much of their condition stems from each mechanism. This distinction matters greatly for treatment planning, as different approaches target different mechanisms.
The Dental Connection
Dr. McCarty emphasizes that dental professionals are uniquely positioned to identify sleep apnea risk factors before patients even reach medical specialists.
"Your medical brethren and siblings are not ready to evaluate the oral vault as a risk factor for sleep," he notes. "The dental community is really in a great place to use their skills and vocabulary to see things and teach their medical siblings."
He recommends dental professionals consider using screening tools like the "FAIRist Six"—a chairside assessment examining six physical attributes that can indicate airway issues. Dental hygienists, who see patients regularly, may be particularly well-positioned to incorporate such screenings into routine care.
Creating a Common Language
Perhaps most importantly, Dr. McCarty advocates for a shared vocabulary around sleep disorders that bridges the gap between dental and medical approaches.
"What's happened here is the language of sleep apnea has divergently evolved," he explains. While medical doctors approach sleep apnea through one lens, dental sleep medicine pioneers have developed different terminology around developmental aspects of oral structures.
The result? Patients bounce between providers who seem to be talking about completely different conditions, making it difficult to navigate treatment options coherently.
"I want people to be using the language of complexity in common conversation," Dr. McCarty says. "If the patient and the provider don't share this understanding of the complexity, they can't help one another."
Empowering Patients and Providers
Through his Empowered Sleep Apnea Project, Dr. McCarty aims to create a structure for understanding sleep disorders that is "portable"—usable by any healthcare provider and centered on patient needs rather than specific treatments.
This approach shifts away from the traditional "eat your vegetables because they're good for you" dynamic of prescribing CPAP machines without adequate explanation. Instead, it brings patients into the conversation as informed partners who understand why specific approaches might help their unique situation.
For dental professionals looking to incorporate sleep medicine into their practices, Dr. McCarty's frameworks offer a pathway to engage with this complex field without becoming overwhelmed—and most importantly, without overwhelming patients.
By recognizing the multifaceted nature of sleep disorders and collaborating across specialties, healthcare providers can better address a condition that impacts millions of Americans, often hiding in plain sight behind other health concerns.
Keywords: Sleep apnea, sleep medicine, dental-medical collaboration, Five-Finger Approach, obstructive sleep apnea, central sleep apnea, hypertension, airway assessment, sleep disorders, Dr. Dave McCarty, The Dental Handoff podcast, sleep screening, dental sleep medicine