positive-negative pressure breathing

pos·i·tive-·neg·a·tive pres·sure breath·ing (PNPB),

inflation of the lungs with positive pressure and deflation with negative pressure by an automatic ventilator.

pos·i·tive-neg·a·tive pres·sure breath·ing

(poz'i-tiv-neg'ă-tiv presh'ŭr brēdh'ing) Inflation of the lungs with positive pressure and deflation with negative pressure by a ventilator.