A nurse is caring for a client who is experiencing anaphylactic shock in response to the administration of penicillin. Which of the following medications should the nurse administer first?

A. While this is a good safety measure for any client, it doesn't address the specific issue of homonymous hemianopsia.
B. This can be helpful for clients with motor difficulties but does not address the visual impairment.
C. Since the client has a right-sided stroke and homonymous hemianopsia, they will likely miss food on the left side of their tray. Reminding them to scan that area can help prevent them from missing food.
D. While this might seem logical, it doesn't address the underlying issue of the client's visual impairment.

A. Atrial fibrillation is consistent with the symptoms described. It causes irregular palpitations and dizziness due to the rapid and irregular ventricular rate. The significant pulse deficit can occur because the irregular rhythm may lead to intermittent weak or absent pulses. The ECG typically shows an irregular rhythm with no identifiable P waves and an irregularly irregular ventricular response.
B. Sinus bradycardia does not usually cause a rapid and irregular heart rate. It is characterized by a regular rhythm with a slow heart rate. While it can cause fatigue and dizziness, it does not typically present with an irregular rhythm or a significant pulse deficit. Therefore, it is less consistent with the symptoms described.
C. Sinus tachycardia is characterized by a rapid but regular heart rate. It does not typically present with an irregular rhythm or significant pulse deficit. While it may cause symptoms such as palpitations and

dizziness, the regular rhythm and absence of irregularity in the ECG make it less likely to be the cause of the significant irregular pulse deficit described.
D. First-degree AV block does not usually cause a rapid and irregular heart rate. It typically presents with a regular rhythm but with a prolonged PR interval. It is not typically associated with irregular palpitations or a significant pulse deficit. The symptoms described are not characteristic of first-degree AV block.