Final answer:
Clients with type 1 diabetes mellitus should be instructed to monitor for symptoms of hypoglycemia, which include cool, clammy skin, as opposed to symptoms of hyperglycemia such as increased thirst and urination.
Step-by-step explanation:
The nurse should instruct the client with a new diagnosis of type 1 diabetes mellitus to monitor for cool, clammy skin as a manifestation of hypoglycemia. Unlike symptoms associated with hyperglycemia, such as excessive thirst (polydipsia), frequent urination (polyuria), and increased hunger (polyphagia), hypoglycemia presents with different signs. When blood glucose levels fall significantly, typically due to over-secretion of insulin or not consuming enough carbohydrates, the individual may experience symptoms such as sweating, tremors, faintness, and cool, clammy skin due to the activation of sympathetic nervous system responses.
Hypoglycemia requires immediate attention and can often be remedied with the oral intake of sugar. It's crucial for patients with diabetes mellitus to recognize these signs early to prevent more severe consequences, such as unconsciousness or even death.