Final answer:
The nurse would be most concerned if the client is observed to have Kussmaul respirations and diaphoresis. These symptoms indicate potential metabolic disturbances and require immediate medical attention.
Step-by-step explanation:
The nurse would be most concerned if the client is observed to have Kussmaul respirations and diaphoresis. Kussmaul respirations are deep and rapid breaths that are typically seen in diabetic ketoacidosis, a serious complication of diabetes. Diaphoresis, or excessive sweating, can also be a sign of hypoglycemia or low blood sugar. These symptoms indicate potential metabolic disturbances and require immediate medical attention.