A pH below 3.3 can lead to failure of anesthesia because the solution is too acidic

The correct onset of action for lidocaine is:

A) 30 seconds to 1 minute with vasoconstrictor B) 2 to 3 minutes C) 5 to 7 minutes D) 6 to 10 minutes

The flow waveform pattern that will decrease peak pressure but at the same time may increase mean airway pressure is which of the following?

a. Sine b. Rectangular c. Ascending ramp d. Descending ramp