The nurse is providing medication teaching to a client with bipolar disorder who receives a prescription for lithium carbonate. Which instruction should the nurse emphasize with the client?

A) Worsening headache:
This option is correct. Vasopressin, also known as antidiuretic hormone (ADH), acts to increase water reabsorption in the kidneys, thereby reducing urine output. However, excessive administration of vasopressin can lead to vasoconstriction, which may result in increased intracranial pressure and subsequent headaches. Therefore, worsening headache can be indicative of vasopressin overdose or adverse effects, and it should be promptly reported to the healthcare provider for evaluation and appropriate management.

B) Polyuria:
Polyuria, or excessive urine output, is the opposite effect of vasopressin. While diabetes insipidus is characterized by polyuria due to insufficient ADH secretion or renal responsiveness to ADH, administering vasopressin should decrease urine output. Therefore, polyuria would not be expected as a side effect of vasopressin administration.

C) Polydipsia:
Polydipsia, or excessive thirst, is also a symptom of diabetes insipidus but is not typically associated with vasopressin administration. Vasopressin functions to decrease urine output and, consequently, reduce thirst. Therefore, polydipsia would not be expected as a side effect of vasopressin administration.

D) Low urine specific gravity:
Vasopressin administration is expected to increase urine specific gravity by promoting water reabsorption in the kidneys, leading to more concentrated urine. Therefore, low urine specific gravity would not be an expected side effect of vasopressin administration.

A) Irrigation and topical antibiotic application to wound area: While wound care is important in managing infections, obtaining cultures before initiating antibiotic therapy takes precedence to ensure appropriate treatment. Topical antibiotics may not adequately address systemic infections caused by gram-negative bacteria.
B) Monitor for signs of sodium and fluid retention: This intervention is important when administering certain antibiotics, such as those in the aminoglycoside class, but it is not the most immediate priority. Monitoring for signs of sodium and fluid retention is typically indicated after antibiotic therapy has commenced and involves assessing the client's clinical status and laboratory values for signs of electrolyte imbalance or fluid overload.
C) Wound and blood specimens for culture and sensitivity: This action is essential before initiating antibiotic therapy because it allows for the identification of the specific organism causing the infection and its susceptibility to antibiotics. This information guides the selection of the most appropriate antibiotic for targeted therapy, improving treatment efficacy and reducing the risk of antibiotic resistance.
D) Complete blood count and serum electrolytes: While monitoring laboratory values is important in the overall management of the client, obtaining cultures for culture and sensitivity testing is the priority before initiating antibiotic therapy. This step helps ensure that the chosen antibiotic is effective against the specific pathogen causing the infection.