Fig. 1.
The early evaluation of mouth-to-mouth ventilation and validation of head extension as a two-hand technique by Peter Safar at the Baltimore City Hospital. Reprinted from Baskett PJF: Peter J. Safar, the early years 1924 to 1961, the birth of CPR. Resuscitation 2001; 50:17–22 with kind permission from Elsevier.