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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
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Sleep-disordered breathing and resistant hypertension.

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Obstructive sleep apnea (OSA) is linked to resistant hypertension. Continuous positive airway pressure therapy offers modest blood pressure control benefits for OSA patients, but its impact on hard outcomes requires more study.

Keywords:
Sleep disordered breathingcontinuous positive airway pressurehypertensiontreatment

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Area of Science:

  • Cardiology
  • Nephrology
  • Sleep Medicine

Background:

  • Hypertension affects one-third of adults globally, with resistant hypertension in 15-20% of cases.
  • Resistant hypertension predicts adverse cardiovascular and renal outcomes.
  • Obstructive sleep apnea (OSA) is recognized as a significant cause of secondary hypertension.

Purpose of the Study:

  • To discuss the associations between OSA and resistant hypertension.
  • To review the pathophysiologic mechanisms linking OSA and hypertension.
  • To summarize recent evidence on continuous positive airway pressure (CPAP) therapy for blood pressure control in OSA patients.

Main Methods:

  • Review of epidemiologic evidence linking OSA to resistant hypertension and target organ damage.
  • Analysis of prospective longitudinal studies on OSA as a hypertension risk factor.
  • Summarization of prospective randomized controlled trials and meta-analyses on CPAP therapy's effect on blood pressure in OSA patients.

Main Results:

  • Epidemiologic data strongly link OSA to resistant hypertension, nondipping nocturnal blood pressure, and target organ damage.
  • OSA independently predicts hypertension development and increased risk of cardiovascular events and mortality.
  • The majority of trials indicate a modest but significant blood pressure reduction with CPAP therapy in OSA patients.

Conclusions:

  • OSA is a critical risk factor for resistant hypertension and adverse cardiovascular outcomes.
  • CPAP therapy provides a significant benefit for blood pressure management in patients with OSA.
  • Further investigation is needed to determine if CPAP therapy improves hard clinical outcomes in patients with OSA and resistant hypertension.