ABSTRACT
Although echocardiography was introduced to North America in the early 1950s, it was not until a decade later that Harvey Feigenbaum brought cardiac ultrasound into clinical practice. In collaboration with Harold Dodge, he applied the M-mode technique to measure le ventricular (LV) wall thickness and dimensions, LV stroke volume, and ejection fraction in patients with cardiac disease.1 With technological advances including real-time 2D imaging, pulsed-wave and continuous wave spectral Doppler, color Doppler, transesophageal echogradiography (TEE), and 3D imaging, its use has extended beyond cardiology and has entered into other clinical theaters, such as the operating room, emergency room, and intensive care unit (ICU).
