A 19-year-old man was arrested Monday after he was captured on surveillance video beating up an OB-GYN doctor at Mount Sinai Medical Center in Miami Beach, authorities said. According to authorities, Ventura Del Castillo Perez’s mother was a patient of Dr. Steven Silvers, and he was apparently upset because of the medication Silvers prescribed his mother. According to his arrest report, when police arrived to the hospital Monday morning, they located Del Castillo Perez, who was crying and struggling to catch his breath. “Defendant stated he was upset about what Doctor Silvers had prescribed his mother and wanted to advise...