The parents of a child with acid-base imbalance ask the nurse about mechanisms that regulate acid-base balance. Which statement by the nurse accurately explains the mechanisms regulating acid-base balance in children?

Legg-Calve-Perthes disease, also known as Perthes disease, is a childhood condition that affects the hip joint. It occurs due to a disruption in the blood supply to the femoral head (epiphysis), which can lead to bone death (avascular necrosis) and subsequent deformity of the femoral head.

It is essential for parents to understand that Legg-Calve-Perthes disease is not an acute illness that lasts for a short duration (Option A). It is a chronic condition that typically progresses over a period of months or years.

stating that it is caused by a virus, in (option C) is incorrect. The exact cause of Legg-Calve- Perthes disease is not fully understood, but it is not caused by a viral infection. It is believed to be related to multifactorial factors, including genetic and vascular factors.

stating that it primarily affects adults, in (option D) is incorrect. Legg-Calve-Perthes disease predominantly affects children, typically between the ages of 4 and 8 years old, during the period of rapid growth.

A change in status that should alert the nurse to increased intracranial pressure (ICP) in a child with a head injury is confusion and altered mental status. As intracranial pressure increases, it can affect brain function and lead to neurological changes, including confusion, disorientation, irritability, decreased level of consciousness, or other alterations in mental status. These changes indicate that the brain is being compressed and compromised, and immediate intervention is required.

Option B, increased diastolic pressure with narrowing pulse pressure in (option B) is incorrect because it, can be a sign of increased ICP, but it is not specific to head injuries and can be influenced by other factors such as pain, anxiety, or systemic conditions. It is important to consider the overall hemodynamic status of the child and assess for additional signs and symptoms of increased ICP.

irregular, rapid heart rate in (option C), can be a sign of increased ICP, but it is not specific to head injuries and can be influenced by other factors such as pain, anxiety, or other medical conditions. Assessment of heart rate should be considered along with other signs and symptoms of increased ICP.

rapid, shallow breathing, in (option D) can be a sign of increased ICP, but it is not specific to head injuries and can be influenced by other factors such as pain, anxiety, or respiratory conditions. Respiratory assessment should be considered along with other signs and symptoms of increased ICP.