Bio 152-2 Animal Case 1 – 3 rd Case study for the semester Spring 2009 Up a creek with a couple of paddles You are an emergency room physician making the rounds on patients awaiting treatment. Suddenly, chaos (more than normal) ensues. Patient 1 , who has a history of heart problems and entered the ER with chest pains, shortness of breath, and extremely low blood pressure, has suddenly slipped into unconsciousness and has no pulse. At the same moment, Patient 2 , who has a history of coronary artery disease, has suddenly become unconscious, with no blood pressure or pulse detected. You look at their electrocardiogram (ECG) readings to assess their problems. But first, you recall what a (basic) “normal” ECG looks like and how to interpret it: The P wave indicates stimulatory impulses (depolarization) propagated throughout the atria. The steep incline of the QRS complex reflects the depolarizing impulses traveling through the bundle branches, while the sharp decline indicates stimulatory impulses traveling through the Perkinje fibers. The
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