Extract: The electrocardiograms of 26 patients with persistent left superior vena cava (SVC) draining into the coronary sinus were reviewed. Left axis of P waves between +15 and −29 degrees was ...
Prep for the United States Medical Licensing Examination (USMLE) with these practice quizzes. Read the question thoroughly, choose the best answer, then click "submit" to see the correct answer and ...
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