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In extremis from dynamic hyperinflation, briefly disconnecting the circuit vents trapped gas, rapidly lowering intrathoracic pressure and improving preload/CO. This is a temporizing measure while you lower RR, reduce VT, and increase inspiratory flow to prolong exhalation. Lengthening inspiratory time (B) worsens trapping by shortening expiration. Matching PEEP (C) is used cautiously for trigger assistance in mild obstruction; in severe cases it risks increasing total PEEP and collapse. Diuretics (D) have no role. After the brief disconnect, immediately implement lung-protective, obstruction-sensitive settings, ensure deep sedation ± ketamine, and continue bronchodilators. Monitor BP, EtCO₂, and auto-PEEP with expiratory holds; be prepared for repeated transient disconnect only if life-saving and with high FiO₂ preoxygenation. Evaluate for mucus plugging and suction if high resistance persists.