A client who suffered a brain injury after falling off a ladder has recently developed syndrome of inappropriate antidiuretic hormone (SIADH). What findings indicate that the treatment he's receiving for SIADH is effective?

1. Decrease in body weight

2. Rise in blood pressure and drop in heart rate

3. Absence of wheezes in the lungs

4. Increase in urine output

5. Decrease in urine osmolarity