Final answer:
The nurse should report crackles in the lungs as an adverse effect when managing a client with increased ICP receiving mannitol, as it could indicate pulmonary edema due to fluid shifts caused by the diuretic effect of mannitol.
Step-by-step explanation:
When caring for a client with increased intracranial pressure (ICP) who is receiving mannitol via continuous IV infusion, the nurse should report crackles in the lungs as an adverse effect. Mannitol acts as an osmotic diuretic, and while an increased urine output is an expected outcome, it can also lead to fluid shifts that cause pulmonary edema, represented by crackles in the lungs. Other potential adverse effects of mannitol include electrolyte imbalances, such as decreased sodium levels (hyponatremia), which can lead to confusion, seizures, and decreased level of consciousness. Therefore, the nurse should closely monitor the patient for these signs and report any adverse findings to the medical team.