A 31-year-old male client with excessive daytime sleepiness (EDS) has episodes in which he loses muscle tone but remains conscious. These episodes usually occur after he laughs. What should the PMHNP assess for?

Choice A reason: Pseudobulbar affect is characterized by sudden, uncontrollable episodes of laughing or crying that are disproportionate or unrelated to the situation. It does not involve loss of muscle tone or cataplexy and is typically associated with neurological conditions such as multiple sclerosis or traumatic brain injury. Choice B reason: Secondary narcolepsy occurs due to identifiable causes such as brain injury, tumors, or infections affecting the hypothalamus. While it can present with excessive daytime sleepiness, cataplexy is not a defining feature unless hypocretin deficiency is present. The presence of cataplexy in this case points more specifically to Type 1 narcolepsy. Choice C reason: Type 1 narcolepsy is characterized by excessive daytime sleepiness and cataplexy—sudden loss of muscle tone triggered by strong emotions such as laughter, while consciousness is preserved. This presentation is classic for Type 1 narcolepsy and is associated with low cerebrospinal fluid hypocretin levels. Choice D reason: Type 2 narcolepsy also presents with excessive daytime sleepiness but lacks cataplexy. Since the patient experiences muscle tone loss triggered by laughter, Type 2 narcolepsy is ruled out.