The nurse's teaching plan for a client taking lithium should include instructions to:

Choice a reason:
Warming the hands with water before testing is actually a recommended practice. It helps increase blood flow to the fingertips, making it easier to get a sufficient blood sample for testing. Cold hands can restrict blood flow, leading to difficulty in obtaining a blood sample and potentially inaccurate results.

Choice b reason:
Alternating fingers for blood glucose testing is also a recommended practice. It helps prevent soreness and calluses on the fingers from repeated pricks. Using different fingers or different sides of the same finger can help reduce pain and potential damage to the skin.

Choice c reason:
Choosing the center of the finger pad as a puncture site is not recommended. The sides of the fingertips are preferred because they have fewer nerve endings, making the process less painful. The center of the finger pad has a denser nerve supply and can lead to more discomfort during the test.

Choice d reason:
A random blood glucose result of 115 mg/dL is slightly above the normal range for non-diabetics, which is typically between 70 to 99 mg/dL when fasting. For someone with diabetes, this result might be considered within a target range, depending on individual treatment goals set by healthcare providers. However, it's important to note that a single glucose reading does not provide a complete picture of glucose control. An A1C test, which reflects average blood glucose levels over the past 2-3 months, is also necessary to assess overall glucose management.

Choice A reason:
Magnesium sulfate is used in the management of severe preeclampsia primarily for seizure prophylaxis. One of the key side effects of magnesium sulfate is its impact on neuromuscular transmission, leading to diminished deep-tendon reflexes as serum magnesium levels rise. The therapeutic range for anticonvulsant prophylaxis is typically between 5-8 mg/dL. Reflexes may begin to diminish when serum levels reach 8-12 mg/dL, indicating potential magnesium toxicity. Therefore, diminished reflexes are a warning sign to reassess the infusion rate and possibly reduce or discontinue the medication.

Choice B reason:
A respiratory rate of 16 breaths per minute falls within the normal adult range and suggests that the client's respiratory system is not being adversely affected by the magnesium sulfate infusion. Respiratory rate is a critical parameter to monitor during magnesium sulfate therapy, as respiratory depression is a serious side effect of magnesium toxicity. Maintaining a normal respiratory rate indicates that it is safe to continue the infusion at the current rate.

Choice C reason:
While a urine output of 50 mL/hr is on the lower end of the normal range, it is still considered adequate for most adults. In the setting of magnesium sulfate therapy for severe preeclampsia, maintaining adequate urine output is essential for ensuring that the kidneys can excrete the magnesium to prevent accumulation and toxicity. If urine output decreases significantly, it may necessitate reevaluation of the infusion rate or additional interventions to support renal function.

Choice D reason:
A heart rate of 56 beats per minute is slightly bradycardic but may not be clinically significant if the client is asymptomatic. However, magnesium has a direct effect on cardiac function, and high levels can lead to bradycardia and other cardiac conduction abnormalities. It is important to monitor the client's heart rate and rhythm during magnesium sulfate therapy to detect any early signs of cardiac involvement due to magnesium toxicity.