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Results 1 - 1 of 1 for Prominent S wave in lead I
  1. SVC obstruction 
    ... neck The swelling may be worse or more prominent when lying down than when upright. It may ... a heart blood vessel study) Doppler ultrasound (sound wave test of the blood vessels) Radionuclide ventriculography (nuclear ...
    https://medlineplus.gov/ency/article/001097.htm - Medical Encyclopedia