Which postoperative respiratory intervention is contraindicated after transsphenoidal hypophysectomy?

Which postoperative respiratory intervention is contraindicated after transsphenoidal hypophysectomy?

• A. Continuous positive airway pressure
• B. Supplemental oxygen via nasal cannula
• C. Endotracheal intubation
• D. Noninvasive positive pressure ventilation

Answer: (A)

After transsphenoidal hypophysectomy the skull base repair sits just behind the nasal/sphenoidal passages, so it must be protected from any rise in pressure transmitted through the nose and upper airway. Continuous positive airway pressure delivers a constant positive pressure throughout both inspiration and expiration, which markedly increases intranasal and intracranial pressures and can push air through the repair site, risking a CSF leak or pneumocephalus. Because of this risk, continuous positive airway pressure is contraindicated in the immediate postoperative period. Providing oxygen via nasal cannula doesn’t generate significant airway pressure and is generally safe for maintaining oxygenation. Endotracheal intubation is an airway management technique used to protect the airway or provide ventilation when needed, not a means of applying positive airway pressure through the nasal passages. Noninvasive positive pressure ventilation also elevates airway pressures, but the defining risk here is the continuous nasal pressure from CPAP, which is why that option is avoided.

After transsphenoidal hypophysectomy the skull base repair sits just behind the nasal/sphenoidal passages, so it must be protected from any rise in pressure transmitted through the nose and upper airway. Continuous positive airway pressure delivers a constant positive pressure throughout both inspiration and expiration, which markedly increases intranasal and intracranial pressures and can push air through the repair site, risking a CSF leak or pneumocephalus. Because of this risk, continuous positive airway pressure is contraindicated in the immediate postoperative period. Providing oxygen via nasal cannula doesn’t generate significant airway pressure and is generally safe for maintaining oxygenation. Endotracheal intubation is an airway management technique used to protect the airway or provide ventilation when needed, not a means of applying positive airway pressure through the nasal passages. Noninvasive positive pressure ventilation also elevates airway pressures, but the defining risk here is the continuous nasal pressure from CPAP, which is why that option is avoided.