Do you have any of the following symptoms that require emergency treatment? Call 911 or other emergency services immediately.

• Unconsciousness. See Rescue Breathing and Cardiopulmonary Resuscitation (CPR) in the topic Dealing With Emergencies.
• Chest discomfort or pain that is crushing or squeezing or feels like a heavy weight on the chest
• Chest discomfort or pain that occurs with:
  • •Sweating
  • •Shortness of breath
  • •Nausea or vomiting
  • •Discomfort or pain that spreads from the chest to the neck, jaw, or one or both shoulders or arms
  • •Dizziness or lightheadedness
  • •Fast heart rate or irregular heart rhythm
• Moderate to severe difficulty breathing
• Shock
• Sudden heart rate or rhythm change with nausea, lightheadedness, fainting, or severe fatigue