A nurse is caring for a client who has Meniere’s disease. The nurse identifies that which of the following manifestations is caused by an excessive accumulation of endolymph fluid?

A. Severe myopia: Severe myopia refers to nearsightedness and is not typically associated with Meniere's disease. Myopia affects vision but is unrelated to the characteristic symptoms of Meniere's disease.

B. Vertigo: Vertigo is a hallmark symptom of Meniere's disease. It is characterized by a sensation of spinning or dizziness, often accompanied by nausea, vomiting, and imbalance. Vertigo episodes in Meniere's disease can be severe and debilitating, significantly impacting the individual's quality of life.

C. Anosmia: Anosmia refers to a loss of sense of smell and is not a typical manifestation of Meniere's disease. Meniere's disease primarily affects the inner ear and is characterized by symptoms related to vestibular dysfunction, such as vertigo, rather than olfactory disturbances.

D. Photopsia: Photopsia refers to the perception of flashing lights or visual disturbances and is not a characteristic manifestation of Meniere's disease. Visual disturbances may occur in certain conditions affecting the eyes or visual pathways but are not typically associated with Meniere's disease, which primarily affects the inner ear and vestibular system.

Pulseless electrical activity (PEA) refers to a situation in which an electrocardiogram (ECG) shows electrical activity in the heart, but there is no effective mechanical activity and no palpable pulse. PEA can result from various underlying conditions that impair cardiac function or compromise circulation.

A. Hypertension: Hypertension, or high blood pressure, is not typically a direct cause of PEA. While uncontrolled hypertension can contribute to cardiovascular disease and increase the risk of cardiac events such as myocardial infarction, it is not a direct cause of PEA.

B. Hypovolemia: Hypovolemia, or low blood volume, is a common cause of PEA. Reduced circulating blood volume leads to decreased preload and inadequate filling of the heart chambers, impairing cardiac output. This can result in ineffective cardiac contractions and the development of PEA.

C. Hypoxia: Hypoxia, or inadequate oxygenation of tissues, is a significant cause of PEA. Insufficient oxygen delivery to the myocardium impairs cardiac function and can lead to ineffective cardiac contractions. Without adequate oxygenation, the heart is unable to generate sufficient mechanical force to maintain circulation, resulting in PEA.

D. Hyperkalemia: Hyperkalemia, or elevated levels of potassium in the blood, can cause PEA by disrupting cardiac electrical activity. Excessive potassium ions in the extracellular fluid alter the normal myocardial action potential, leading to cardiac conduction abnormalities and potential arrhythmias, including PEA.

E. Hypernatremia: Hypernatremia, or elevated levels of sodium in the blood, is not typically a direct cause of PEA. While severe hypernatremia can lead to neurological symptoms and dehydration, it does not directly impair cardiac electrical activity or mechanical function to the extent that it causes PEA.

F. Hyperthermia: Hyperthermia, or elevated body temperature, is not typically a direct cause of PEA. While extreme hyperthermia can lead to cardiovascular complications such as heat stroke, it is not a common cause of PEA unless it is associated with severe systemic metabolic derangements.