Final answer:
The next action would be to assess the patient's symptoms, vital signs, and underlying cause of the tachycardia. Medication may be considered if vagal maneuvers are ineffective.
Step-by-step explanation:
Tachycardia is a condition where the heart rate is above 100 beats per minute. In the case of the monitored patient in the ICU, they are experiencing narrow-complex tachycardia with a heart rate of 220 beats per minute. This indicates a rapid heart rate.
The next action to take would be to assess the patient's symptoms and vital signs, as well as the underlying cause of the tachycardia. Since vagal maneuvers have not been effective in reducing the heart rate, medication may be considered. It is important to address any potential underlying causes and consult with a healthcare professional for further guidance and treatment.