FREE RST Sleep Disorder Pathophysiology Questions and Answers

Question 1

A patient with severe, untreated obstructive sleep apnea (OSA) is at an increased risk for developing systemic hypertension.
What is the primary pathophysiological mechanism that links the repetitive respiratory events of OSA to elevated blood pressure?

Accepted Answer

Repetitive episodes of intermittent hypoxia and arousals leading to sympathetic nervous system over-activation.

Answer

Chronic elevation of parasympathetic nervous system activity during sleep.

Answer

A decrease in circulating cortisol levels due to fragmented sleep.

Answer

Mechanical stress on the heart from excessive diaphragmatic effort alone.

Question 2

The pathophysiology of Narcolepsy Type 1 is most directly associated with a significant loss of which of the following?

Accepted Answer

Hypocretin (orexin)-producing neurons in the lateral hypothalamus.

Answer

Dopamine-producing neurons in the substantia nigra.

Answer

Serotonin receptors in the dorsal raphe nucleus.

Answer

Acetylcholine-releasing cells in the pontine tegmentum.

Question 3

A 70-year-old male with a history of congestive heart failure (CHF) undergoes a polysomnogram. The recording shows a cyclical crescendo-decrescendo pattern of breathing effort and airflow, followed by a central apnea. This pattern is characteristic of Cheyne-Stokes Respiration. What is the primary pathophysiological driver of this breathing pattern in this patient?

Accepted Answer

Prolonged circulation time between the lungs and the brainstem chemoreceptors.

Answer

Upper airway neuromuscular collapse due to fluid overload.

Answer

Opioid-induced suppression of the medullary respiratory center.

Answer

Loss of normal muscle atonia during REM sleep.

Question 4

REM Sleep Behavior Disorder (RBD) is characterized by dream-enacting behaviors. This is a direct result of a failure in which normal physiological process?

Accepted Answer

The maintenance of muscle atonia during REM sleep.

Answer

The generation of sleep spindles and K-complexes in N2 sleep.

Answer

The suppression of the circadian alerting signal from the SCN.

Answer

The homeostatic drive for sleep that builds during wakefulness.

Question 5

The pathophysiology of Restless Legs Syndrome (RLS) is most strongly linked to a dysfunction in which of the following systems?

Accepted Answer

Central nervous system iron metabolism and dopaminergic pathways.

Answer

Adenosine accumulation in the basal forebrain.

Answer

Hypocretin/Orexin signaling from the hypothalamus.

Answer

GABAergic inhibition in the cerebral cortex.

Question 6

In the pathophysiology of obstructive sleep apnea (OSA), which factor is considered the most critical contributor to the repeated collapse of the upper airway during sleep?

Accepted Answer

Reduced activity of the genioglossus and other pharyngeal dilator muscles.

Answer

Excessive secretion of melatonin from the pineal gland.

Answer

Over-activation of the diaphragm during inspiration.

Answer

A primary failure of central respiratory drive from the brainstem.

A patient with severe, untreated obstructive sleep apnea (OSA) is at an increased risk for developing systemic hypertension.What is the primary pathophysiological mechanism that links the repetitive respiratory events of OSA to elevated blood pressure?

A patient with severe, untreated obstructive sleep apnea (OSA) is at an increased risk for developing systemic hypertension.
What is the primary pathophysiological mechanism that links the repetitive respiratory events of OSA to elevated blood pressure?