A nurse is teaching a class about sleep. The nurse should include that which of the following hormones regulates the sleep-wake cycle?

Herbal supplements are commonly used as complementary therapies to manage various symptoms, including gastrointestinal discomfort such as nausea and vomiting. Some herbs contain bioactive compounds that influence gastrointestinal motility, gastric emptying, and central pathways involved in nausea regulation. Nurses must understand evidence-based herbal effects to provide safe and accurate patient education. Among commonly used supplements, only a few have well-documented antiemetic properties.

Rationale:
A. Cranberry is primarily used for urinary tract health due to its ability to reduce bacterial adherence to the bladder wall. It has no significant antiemetic properties and does not affect gastrointestinal motility or nausea pathways. Therefore, it is not used to manage nausea symptoms.

B. Echinacea is commonly used to support immune function and may be taken for prevention or management of upper respiratory infections. It does not have clinically significant effects on nausea or vomiting and is not indicated for gastrointestinal symptom relief.

C. Garlic is used for cardiovascular health, including potential cholesterol-lowering and antimicrobial effects. However, it can actually irritate the gastrointestinal tract in some individuals and may worsen nausea or heartburn rather than relieve it. It is not recommended for managing nausea.

D. Ginger is an evidence-supported herbal supplement that helps reduce nausea and vomiting by promoting gastric emptying and acting on serotonin receptors in the gastrointestinal tract and central nervous system. It is commonly used for motion sickness, pregnancy-related nausea, and postoperative nausea. Its antiemetic properties make it the correct herb for decreasing nausea symptoms.

Orthostatic hypotension is a condition characterized by an abnormal drop in blood pressure when a person changes position, typically from lying or sitting to standing. It occurs due to impaired autonomic cardiovascular responses, leading to inadequate vasoconstriction and reduced cerebral perfusion. This can cause dizziness, lightheadedness, or syncope shortly after standing. It is clinically significant because it directly increases the risk of injury, particularly falls, in affected clients.

Rationale:
A. Orthostatic hypotension is defined by a decrease in systolic blood pressure of at least 20 mm Hg or a decrease in diastolic pressure of at least 10 mm Hg within 3 minutes of standing. A drop of 10 mm Hg systolic alone is not the standard diagnostic criterion. This statement underestimates the threshold used for clinical diagnosis.

B. A decrease in diastolic blood pressure of 5 mm Hg is not sufficient to define orthostatic hypotension. The accepted diagnostic criteria require a drop of at least 10 mm Hg in diastolic pressure within 3 minutes of standing.

C. Orthostatic hypotension does not directly increase the risk of pulmonary embolism. Pulmonary emboli are typically caused by deep vein thrombosis (DVT) resulting from venous stasis or hypercoagulability. While immobility is a risk factor for both orthostatic hypotension and DVT, the drop in blood pressure itself does not cause blood clots.

D. Orthostatic hypotension significantly increases a client’s risk of falls due to sudden dizziness, lightheadedness, or fainting when standing. The temporary decrease in cerebral perfusion can lead to loss of balance or syncope. This makes fall prevention a key nursing priority in clients with orthostatic hypotension.