NURS 6501: MIDTERM EXAM: Please contact Your Favorite Professor for help with   NURS 6501: Midterm Exam or any other assignment. Email: professorrobertphd@gmail.com   An adult man presents with excessive daytime sleepiness. His wife reports that he snores loudly every night. The patient’s BMI is 32 kg/m2. He denies any history of smoking or alcohol consumption. Which of the following pathophysiologic mechanisms is the primary factor contributing to his likely diagnosis? Group of answer choices

• Increased pharyngeal tissue mass leading to partial or complete airway obstruction
• Decreased diaphragmatic excursion leading to reduced inspiratory volume
• Absence of neural input leading to cessation of respiratory effort
• Parasympathetic overactivity leading to bronchoconstriction

  The correct answer is Increased pharyngeal tissue mass leading to partial or complete airway obstruction.   Explanation: The patient is presenting with excessive daytime sleepiness and loud snoring, which, in combination with his BMI of 32 kg/m², strongly suggest a diagnosis of obstructive sleep apnea (OSA). Pathophysiology of Obstructive Sleep Apnea:

• In obstructive sleep apnea, the primary issue is intermittent obstruction of the upper airway during sleep due to the relaxation of the muscles around the pharynx. This can be exacerbated by increased pharyngeal tissue mass, such as from obesity (which is a common risk factor), leading to partial or complete airway obstruction during sleep. This obstruction leads to breathing pauses and results in poor sleep quality and daytime sleepiness.

Why the other options are incorrect:

• Decreased diaphragmatic excursion leading to reduced inspiratory volume: This would typically be seen in restrictive lung diseases or other conditions affecting the lungs, not in obstructive sleep apnea.
• Absence of neural input leading to cessation of respiratory effort: This would describe central sleep apnea, where the issue is the failure of the brain to send signals to the muscles that control breathing. This is different from OSA, where the problem is mechanical airway obstruction, not a failure to initiate breathing.
• Parasympathetic overactivity leading to bronchoconstriction: This is more relevant to conditions like asthma or other respiratory conditions, not obstructive sleep apnea.

Thus, the primary pathophysiologic mechanism in this patient is increased pharyngeal tissue mass contributing to airway obstruction, which is the hallmark of obstructive sleep apnea.