The RN is co-assigned with an LPN to care for a group of clients in the cardiac unit. Which action by the LPN requires the RN to intervene immediately?

The LPN checks a client's blood pressure before administering nitroglycerin 0.4 mg SL.

The LPN assists a client to the bathroom 15 minutes after returning from a cardiac catheterization.

The LPN brings breakfast to a client who is scheduled for an echocardiogram later in the morning.

The LPN returns a client to bed after the client's heart rate increases from 72 to 96 after ambulation.