A 55-year-old male is admitted to the ICU with increasing shortness of breath, cough, and fever. He has a history of COPD and was recently diagnosed with COVID-19. His vital signs are: BP 90/60 mmHg. HR 120 bpm, RR 32 breaths/min, SpO2 88% on 6L/min oxygen via nasal cannula, Temp 38.9°C (102°F). ABG results show: pH 7.28, PaO2 58 mmHg. PaCO2 55 mmHg, HCO3 25 mEq/L.

If the patient's condition continues to deteriorate despite NIPPV, what is the most appropriate next step?

A. To prevent atmospheric air from entering the pleural space: Preventing air entry is primarily the role of the water seal chamber, which allows one-way flow of air out of the pleural space while preventing backflow.

B. To regulate the amount of suction applied to the chest tube: The suction control chamber determines how much negative pressure is transmitted to the pleural space. The level of water in this chamber controls the suction strength, helping maintain consistent and safe suction without causing lung tissue damage.

C. To collect drainage from the pleural space: Collecting fluid or blood is the function of the collection chamber, not the suction control chamber. The suction control chamber does not store drainage but regulates pressure.

D. To indicate the presence of an air leak: Air leaks are identified by observing bubbling in the water seal chamber, not the suction control chamber. Continuous or intermittent bubbling in the water seal indicates an air leak along the drainage system or from the pleural space.

A. We can control amount of pressure going into lungs, decreasing risk of barotrauma: Pressure-control ventilation delivers breaths to a preset inspiratory pressure, limiting peak airway pressure. This reduces the risk of alveolar overdistension and barotrauma, making it particularly useful in patients with stiff or non-compliant lungs.

B. A patient will only need to be on the ventilator for a short period of time: The duration of mechanical ventilation depends on the patient’s underlying condition and recovery, not the mode itself. Pressure-control ventilation does not inherently shorten ventilation time.

C. The patient is more comfortable on this mode: Comfort may vary depending on sedation and ventilator settings. Pressure-control ventilation does not automatically make the patient more comfortable than other modes.

D. Patient is at lower risk of ventilator associated pneumonia: Ventilator-associated pneumonia risk is influenced by factors such as oral care, suctioning, and positioning, not by the choice of pressure-control ventilation mode.