He was heavily sedated and on a ventilator at Beth Israel Deaconess Hospital, but was "alert, mentally competent and lucid" during the brief initial court appearance at his bedside on Monday, U.S. Magistrate Judge Marianne Bowler found.

CNN: SHARE THIS

Dr. Stephen Epstein, attending physician in the emergency department at Beth Israel Deaconess Medical Center in Boston, said the hospital had received at least 21 patients from the explosions Monday, ranging from people complaining of ear damage to seven needing surgery for life-threatening injuries.

WSJ: Doctors Treating Boston Marathon Victims Describe Injuries

In a court hearing on Monday before a federal magistrate judge at Beth Israel Deaconess Medical Center, Dzhokhar Tsarnaev was charged at his hospital bedside with crimes that could result in the death penalty if convicted.

BBC: Boston bombs: Memorial for slain officer Sean Collier

Massachusetts General Hospital had received 29, Boston Medical Center had 23, Beth Israel Deaconess had 21 and Tufts Medical Center had 12.

WSJ: Two Explosions at Boston Marathon Finish Line