A nurse is preparing to administer labetalol 40 mg IV to a client. Available is labetalol 5 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Rationale:

A. Frequent swallowing: Frequent swallowing, especially of small amounts, can indicate that the child is swallowing blood from postoperative bleeding. This is a common early sign of hemorrhage following a tonsillectomy and requires immediate evaluation.

B. Increased drowsiness: Drowsiness can result from anesthesia, pain medication, or fatigue after surgery. While it should be monitored, it is not a specific indicator of postoperative hemorrhage in a child following tonsillectomy.

C. Elevated pain level: Pain is expected after tonsillectomy and does not necessarily signal bleeding. Sudden severe pain might warrant reassessment, but elevated pain alone is not a definitive sign of hemorrhage.

D. Diminished breath sounds: Diminished breath sounds are not typically associated with post-tonsillectomy hemorrhage. This finding may indicate a respiratory issue, but not specifically bleeding from the surgical site.

Rationale:

A. Sudden muscular contractions: Antipsychotics like haloperidol and chlorpromazine can cause extrapyramidal symptoms (EPS), including acute dystonia, which manifests as sudden, involuntary muscle contractions typically affecting the face, neck, or back.

B. Orthostatic hypotension: Chlorpromazine, a low-potency typical antipsychotic, often causes orthostatic hypotension due to its alpha-adrenergic blockade, increasing fall risk, especially in older adults or those new to therapy.

C. Anticholinergic effects: These include dry mouth, blurred vision, constipation, and urinary retention. Chlorpromazine is particularly known for its anticholinergic side effects due to its action on muscarinic receptors.

D. Tremors: Tremors are part of parkinsonian side effects, another form of EPS commonly caused by haloperidol. They result from dopamine blockade in the nigrostriatal pathway.

E. Sedation: Both haloperidol and chlorpromazine can cause sedation. Chlorpromazine is especially sedating due to its histamine (H1) receptor blockade, which depresses the CNS.

F. Increased urination: Not typically associated with these medications. In fact, anticholinergic effects from chlorpromazine more often lead to urinary retention, not increased urination.