The nurse instructs a client with coronary artery disease in the proper use of nitroglycerin (Nitrostat). At the onset of chest pain, the client should: 1. Call 911 when three nitroglycerin tablets...

The nurse instructs a client with coronary artery disease in the proper use of nitroglycerin (Nitrostat). At the onset of chest pain, the client should:

1. Call 911 when three nitroglycerin tablets taken every 5 minutes are ineffective.

2. Call 911 when five nitroglycerin tablets taken every 5 minutes are ineffective.

3. Take three nitroglycerin tablets, 10 minutes apart, and call 911.

4. Go to the emergency department if three nitroglycerin tablets are ineffective.