Note: Your progress in watching these videos WILL NOT be tracked. These training videos are the same videos you will experience when you take the full ProACLS program. You may begin the training for free at any time to start officially tracking your progress toward your certificate of completion.

The most common underlying causes of cardiac arrest are presented as H's and T's. The H’s stand for hypovolemia, hypoxia, hydrogen ion or acidosis, hypokalemia, hyperkalemia, and hypothermia. The T's are tension pneumothorax, cardiac tamponade, toxins, pulmonary thrombosis, and coronary thrombosis.