Correct Answer: B

Rationale: When the body needs to lose heat, one of the mechanisms it employs is radiation. Radiation involves the transfer of heat from the body to the environment in the form of infrared waves. While metabolism, exercise, and food digestion contribute to heat production, they are not mechanisms for heat loss. Metabolism generates heat as a byproduct, exercise increases metabolic rate leading to heat production, and food digestion involves some heat generation, but these processes do not directly facilitate heat loss. Therefore, in the scenario where the patient is feeling cold, radiation is the primary mechanism for the body to lose excess heat and maintain a stable internal temperature.

Correct Answer: B

Rationale: The correct answer is, 'The change in blood pressure readings is called orthostatic hypotension.' Orthostatic hypotension is defined as a drop in systolic pressure of ³20 mm Hg or ³10 mm Hg drop in diastolic pressure that occurs with a quick change to a standing position. This condition is common in individuals on prolonged bed rest, older adults, those with hypovolemia, or taking specific medications. The blood pressure readings provided in the question (150/90 mm Hg lying, 130/80 mm Hg sitting, and 100/60 mm Hg standing) demonstrate a significant change in blood pressure with position changes, which is indicative of orthostatic hypotension. Choices A, C, and D are incorrect because the readings do not indicate a normal response or blood pressure within normal limits for the patient's age; rather, they suggest the presence of orthostatic hypotension.

Correct Answer: B

Rationale: Rectal temperature measurement is preferred in situations where other routes are impractical or when the most accurate measure is necessary, such as in critically ill patients. The rectal route may be chosen due to its reliability in such cases. For older adults, school-age children, and patients receiving oxygen via nasal cannula, rectal temperature measurement is not typically indicated. Other routes like oral, tympanic, or axillary measurements are more commonly used in these populations due to comfort, convenience, and non-invasive nature.

Correct Answer: B

Rationale: In infants, a normal head measurement is approximately 32 to 38 cm, and it is usually around 2 cm larger than the chest circumference. These measurements vary with age; between 6 months and 2 years, both measurements are approximately the same, and after age 2 years, the chest circumference becomes greater than the head circumference. Given that the 1-month-old infant's head measurement is within the typical range and slightly larger than the chest circumference, the nurse should consider these findings normal. There is no indication to refer the infant for further evaluation or to have the parent return for re-evaluation in 2 weeks, as these measurements fall within the expected parameters for a 1-month-old infant.

Correct Answer: C

Rationale: In situations where a child has ingested a potentially harmful substance, contacting the Poison Control Center quickly is crucial. The Poison Control Center can provide specific guidance tailored to the child's situation, which can include whether immediate medical attention is necessary or if any actions need to be taken at home. Option A, 'This too shall pass,' is not appropriate as it dismisses the seriousness of the situation. Option B, 'Take the child immediately to the ER,' may not always be the best course of action without guidance from experts. Option D, 'Give the child syrup of ipecac,' is outdated advice and not recommended as a first response to poisoning incidents.