Guidance DDIs

Introduction

Sleep apnea encompasses both obstructive sleep apnea syndrome (OSA) and central sleep apnea syndrome (CSA). While OSA is characterized by repeated obstructions of the upper airway, central sleep apnea results from a disruption in respiratory control by the central nervous system. Both forms of sleep apnea are prevalent among patients with psychiatric disorders and stroke patients, significantly impacting health outcomes. This report reviews the available evidence and guidelines to assess whether universal screening for obstructive and central sleep apnea should be recommended for these patient populations.

Evidence from Studies on Patients with Psychiatric Disorders

1. High Prevalence of OSA and CSA in Psychiatric Disorders

Studies show a significant prevalence of OSA in patients with psychiatric disorders, particularly affective disorders such as depression and bipolar disorder. About 62% of psychiatric patients present with OSA, indicating a high risk for untreated sleep apnea [(Wichniak et al., 2023)]. Central sleep apnea is more common in patients with heart failure or neurological conditions, but psychiatric patients, especially those on medications affecting the respiratory center, may also be affected [(Vanek et al., 2022)].

2. Guideline Recommendations for Psychiatric Patients

International guidelines such as those from the American Academy of Sleep Medicine (AASM) recommend that at-risk patients for sleep apnea, including those with psychiatric disorders, be screened for both OSA and CSA. Polysomnography is recommended as the standard diagnostic method, particularly in suspected CSA cases, as home tests may not reliably detect central apneas [(Kapur et al., 2017)]. Patients with psychiatric disorders who experience insomnia, breathing pauses, or excessive daytime sleepiness should be screened for both forms of sleep apnea, especially if they are taking medications that may impair respiration.

3. Conclusion for Psychiatric Patients

Given the high prevalence of OSA and the potential risk for CSA in psychiatric patients, routine screening for both forms of sleep apnea should be considered. Guidelines should aim to standardize these tests across psychiatric clinics.

Evidence from Studies on Stroke Patients

1. OSA and CSA in Stroke Patients

About 60-80% of stroke patients suffer from OSA, which can delay neurological recovery and increase mortality. Central sleep apnea is also prevalent in stroke patients, particularly when brain damage affects respiratory centers [(Camilo et al., 2014)]. CSA is often associated with heart failure but can also occur post-stroke due to damage to the brainstem, which disrupts respiratory regulation. Early diagnosis and treatment of both forms of sleep apnea can improve functional outcomes and survival rates in stroke patients [(Rola et al., 2007)].

2. Guidelines for Stroke Patients

The American Heart Association/American Stroke Association (AHA/ASA) recommends screening for sleep-related breathing disorders (OSA and CSA) in stroke patients, as they are modifiable risk factors for worse neurological outcomes and increased mortality [(Navalkele et al., 2016)]. The Canadian Stroke Prevention Guidelines advocate for the integration of OSA and CSA screening into routine stroke care. This should be done via polysomnography or validated screening tools to detect both OSA and CSA [(King & Cuellar, 2016)].

3. Conclusion for Stroke Patients

Since OSA and CSA are prevalent in stroke patients and lead to poorer recovery and higher mortality if left untreated, all stroke patients should be routinely screened for both forms of sleep apnea.

Recommendations from International and National Guidelines

The American Academy of Sleep Medicine (AASM) recommends thorough screening of at-risk patients with psychiatric disorders or stroke for both OSA and CSA. Polysomnography is recommended for diagnosing CSA as it is the most comprehensive method to detect both obstructive and central apneas [(Kapur et al., 2017)]. The United States Preventive Services Task Force (USPSTF) emphasizes that there is insufficient evidence to recommend universal screening for OSA in asymptomatic adults, but recommends targeted testing for high-risk groups such as stroke patients and patients with severe psychiatric disorders [(Shafazand, 2017)].

Conclusion

Universal screening for OSA and CSA should be recommended for patients with psychiatric disorders and those who have had a stroke. Both forms of sleep apnea are prevalent in these groups and significantly impact health outcomes. International and national guidelines support targeted screening in high-risk patients to ensure early diagnosis and treatment.

Introduction: 

Sleep apnea, especially obstructive sleep apnea (OSA), is highly prevalent among patients with post-traumatic stress disorder (PTSD). Research indicates that sleep apnea, both central and obstructive types, is associated with exacerbation of PTSD symptoms and a potential barrier to effective treatment. The link between sleep apnea and PTSD is a growing concern, and the management of both conditions is critical to improving health outcomes.

Prevalence of Sleep Apnea in PTSD Patients:

• A meta-analysis reported that up to 75.7% of PTSD patients may have OSA with an apnea-hypopnea index (AHI) ≥ 5. Veterans with PTSD are particularly prone to OSA, which negatively affects adherence to continuous positive airway pressure (CPAP) therapy (Ye Zhang et al., 2017).
• Studies suggest that 60% of veterans with PTSD suffer from sleep apnea, although the reasons for this prevalence remain unclear (Brooker et al., 2023).
• PTSD patients often report more severe symptoms when sleep apnea is present. A study of Dutch veterans found that PTSD severity correlated with the presence of OSA, potentially worsening PTSD symptoms (van Liempt et al., 2011).

Health Impacts of Sleep Apnea on PTSD Patients:

• Untreated OSA can worsen the sleep disturbances in PTSD patients, such as nightmares and insomnia, reducing the effectiveness of trauma-focused therapies (Tamanna et al., 2014).
• Studies also highlight that PTSD patients with OSA may have more significant daytime sleepiness, depression, and cognitive impairments, negatively impacting their overall quality of life and increasing the risk of suicidal ideation (Gupta & Jarosz, 2018).

Guidelines for Diagnosis and Management:

1. Screening:

   • PTSD patients should be routinely screened for sleep apnea, especially if they report sleep-related symptoms such as excessive daytime sleepiness, snoring, or frequent awakenings.
   • Screening tools such as the Epworth Sleepiness Scale (ESS) or the Berlin Questionnaire can identify patients at high risk for sleep apnea (Schulz, 2019).

2. Polysomnography (PSG):

   • A sleep study (polysomnography) should be conducted for those at high risk. This can help confirm the diagnosis of OSA and determine the severity (AHI score), which is essential for tailoring the treatment plan (Tamanna et al., 2014).

3. Treatment:

   • CPAP Therapy: Continuous positive airway pressure (CPAP) is the gold standard treatment for OSA. Studies have shown that CPAP reduces nightmares, improves sleep quality, and mitigates PTSD symptoms. Adherence to CPAP is critical, although PTSD patients may struggle with consistent use (Ye Zhang et al., 2017).
   • Behavioral Interventions:Weight management and sleep hygiene practices are crucial, as obesity increases the risk of OSA. Behavioral interventions to improve adherence to CPAP can also enhance treatment outcomes (Yeghiazarians et al., 2021).

4. Follow-up and Adjustments:

   • Patients should be regularly monitored for adherence to CPAP and improvements in PTSD and sleep apnea symptoms. Sleep testing should be repeated to ensure that the treatment is effective (Schulz, 2019).

Conclusion:
Sleep apnea is highly prevalent in patients with PTSD, especially among veterans. Early screening, effective treatment with CPAP, and adherence monitoring are key to managing both OSA and PTSD symptoms. Comprehensive treatment approaches targeting both conditions can significantly improve quality of life for these patients.

1. Prevalence and Mechanism:

   • Sleep apnea, particularly obstructive sleep apnea (OSA), is linked with hypertension, even in individuals of normal weight without metabolic syndrome. This relationship is believed to be due to intermittent hypoxia, oxidative stress, and activation of the sympathetic nervous system, which increases blood pressure independent of obesity (Kono et al., 2007).
   • The association between OSA and arterial hypertension is recognized in patients without metabolic syndrome, with OSA contributing to sustained elevations in blood pressure even without metabolic risk factors (Prejbisz et al., 2014).

2. Obstructive Sleep Apnea (OSA) as a Risk Factor:

   • Patients with OSA show a higher prevalence of hypertension than those without OSA. In normal-weight patients, OSA is an independent risk factor for hypertension due to the mechanical and inflammatory consequences of airway obstruction during sleep, which elevates blood pressure levels (Todea et al., 2013).

3. Role of Central Sleep Apnea (CSA):

   • CSA, though less common, also contributes to fluctuations in blood pressure, typically through autonomic instability and irregularities in oxygen and CO2 levels during sleep. This can lead to both nocturnal and daytime hypertension without being linked to obesity or metabolic syndrome (Fischer & Raschke, 1995).

4. Cardiovascular Risk:

   • The combination of OSA and hypertension, regardless of weight or metabolic factors, significantly increases cardiovascular risk. In particular, left ventricular remodeling and carotid intima-media thickness are more pronounced in non-obese OSA patients with hypertension, even when metabolic syndrome is absent (Prejbisz et al., 2014).

Guidelines and Clinical Recommendations

Current clinical guidelines primarily focus on patients with OSA and co-occurring cardiovascular risks, including hypertension, even in the absence of metabolic syndrome or obesity. Here's a summary of the recommendations and guidelines:

1. Diagnosis and Screening:

   • Guidelines recommend screening for sleep apnea in patients with arterial hypertension, regardless of body weight, especially in cases where blood pressure is difficult to control with medication alone (Florczak et al., 2010).
   • Polysomnography is suggested to confirm the diagnosis, especially for hypertensive patients with symptoms of sleep apnea such as excessive daytime sleepiness, snoring, or nocturnal awakenings (Mineiro et al., 2017).

2. Treatment Approaches:

   • Continuous Positive Airway Pressure (CPAP): CPAP is the primary treatment for OSA and has shown benefits in reducing blood pressure in hypertensive patients. It is especially effective in lowering nighttime blood pressure, which is a critical factor in reducing cardiovascular risks in these patients (Spannella et al., 2018).
   • In hypertensive patients without metabolic syndrome, CPAP can lead to significant improvements in both systolic and diastolic blood pressure, even in the absence of weight loss (Sharma et al., 2011).

3. Lifestyle Modifications:

   • Lifestyle interventions, including regular physical activity and dietary changes, are also recommended for managing hypertension in OSA patients, even those who are not overweight (Choukri et al., 2022).

4. Prognosis and Follow-Up:

   • Long-term follow-up is recommended for hypertensive patients with OSA to monitor blood pressure and cardiovascular health. Periodic reassessment with polysomnography is also advised to evaluate the effectiveness of CPAP therapy and other interventions (Prejbisz et al., 2014).

Conclusion

Patients with arterial hypertension and sleep apnea, even in the absence of metabolic syndrome or overweight, are at an increased risk of cardiovascular disease. Effective screening, diagnosis via polysomnography, and treatment with CPAP are essential interventions. CPAP therapy has been shown to improve blood pressure control and mitigate the cardiovascular risks associated with OSA in these patients.