Anatomy & Physiology第 70 / 100 题
A student asks why an EKG can look normal in a patient whose heart is not pumping effectively. What is the best explanation?
a.The EKG measures blood pressure, not electrical activity
b.The EKG only records the atria
c.EKG machines are frequently inaccurate
d.The EKG records electrical activity, and electrical activity can be present without effective mechanical contraction
解析
An EKG records only the electrical events of the heart, so an organized rhythm can appear on the monitor while the heart produces no pulse, a situation known as pulseless electrical activity. This is exactly why the technician always confirms the patient's condition rather than treating the monitor. The EKG does not measure pressure or output, and it records both atrial and ventricular activity.
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