A nurse is providing site care for a child who a gastrostomy enteral tube. Which of the following actions should the nurse take?

A. Facial erythema is not a primary diagnostic feature of this specific respiratory bacterial infection. While intense coughing fits may cause temporary facial flushing or venous congestion, it is not a hallmark finding. Conditions like fifth disease or slapped-cheek syndrome are more likely to present with persistent malar rashes. This sign lacks the specificity required for a pertussis diagnosis.

B. Peeling of the skin on the extremities, known as desquamation, is classically associated with Kawasaki disease or scarlet fever. Bordetella pertussis does not typically produce the exotoxin profile necessary to cause significant integumentary shedding or widespread dermatological involvement. The pathology of pertussis is primarily localized to the ciliated epithelium of the respiratory tract. It is not an exfoliative disease.

C. In the catarrhal phase of the infection, a low-grade temperature is a standard clinical finding as the immune system responds to the initial bacterial colonization. The presence of systemic inflammation results in mild pyrexia alongside coryza. This manifestation is most prominent before the onset of the characteristic paroxysmal cough. Fever helps differentiate early pertussis from non-inflammatory conditions.

D. A beefy, red tongue, often described as a strawberry tongue, is a classic sign of scarlet fever or toxic shock syndrome. This manifestation occurs due to capillary permeability and inflammation of the lingual papillae caused by Streptococcus pyogenes. Pertussis involves the respiratory mucosa rather than the oral structures or the tongue. This symptom indicates a different bacterial or inflammatory etiology.

A) Irregular heart rate: An irregular heart rate is a key manifestation of hyperkalemia. Elevated potassium levels can interfere with the normal electrical activity of the heart, leading to arrhythmias, which can cause an irregular heart rate. In severe cases, hyperkalemia can lead to life-threatening cardiac events such as ventricular fibrillation or asystole.

B) Dry mucous membrane: Dry mucous membranes are more commonly associated with dehydration, not hyperkalemia. Dehydration can cause fluid volume depletion, which leads to dry mouth and other signs of insufficient hydration. While renal failure can lead to fluid balance issues, dry mucous membranes are not typically linked to elevated potassium levels.

C) Trousseau's sign: Trousseau's sign is a clinical indicator of hypocalcemia, not hyperkalemia. It is a spasm of the hand and wrist that occurs when a blood pressure cuff is inflated above systolic pressure for several minutes. This sign suggests low calcium levels, and while calcium imbalance can occur in renal failure, it is unrelated to hyperkalemia.

D) Hyperactive reflexes: Hyperactive reflexes are more commonly associated with conditions like hypocalcemia, rather than hyperkalemia. In hyperkalemia, the typical findings include muscle weakness or paralysis due to the effect of potassium on muscle and nerve function, but hyperactive reflexes would not be expected.