When performing mouth-to-mask ventilation on an adult patient, ventilations should be delivered over _____ second(s). Respiration and Artificial Ventilation When performing mouth-to-mask ventilation on an adult patient, ventilations should be delivered over _____ second(s). A. 1/2 B. 1 C. 2 D. 3 Answer: B Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+