What vital sign should be closely monitored in a client receiving paroxetine who exhibits restlessness and tachycardia?

When a client is prescribed paroxetine and presents with symptoms such as restlessness and tachycardia, monitoring the heart rate becomes essential. Paroxetine is a selective serotonin reuptake inhibitor (SSRI) that can have side effects including increased heart rate (tachycardia) and anxiety, which may lead to feelings of restlessness.

Tachycardia indicates that the heart is beating faster than normal, which can have various implications, particularly in relation to the cardiovascular system. Close monitoring of the heart rate assists in evaluating the client’s response to the medication and determining if any interventions are necessary. It is particularly important because excessive heart rate can lead to complications, especially in individuals with pre-existing heart conditions.

While monitoring respiratory rate, temperature, and oxygen saturation can be important in different clinical situations, in this particular case, the most critical vital sign to focus on is the heart rate due to the evident tachycardia and its potential implications for the patient's overall health. This focused assessment helps in the management of side effects from the medication and ensures the patient's safety.