Evaluation of cranial base repair techniques utilizing a novel cadaveric CPAP model

Area of Science:

• Neurosurgery
• Otolaryngology
• Respiratory Medicine

Background:

• Obstructive sleep apnea (OSA) guidelines recommend early postoperative continuous positive airway pressure (CPAP) after endonasal skull base surgery.
• The optimal timing for initiating CPAP in these patients remains unclear.
• This study investigates the pressure tolerance of different skull base repair techniques.

Purpose of the Study:

• To evaluate the effectiveness of various skull base repair techniques in withstanding positive airway pressure.
• To determine the pressure thresholds at which different repair methods fail.
• To inform clinical decisions regarding CPAP initiation after endonasal skull base surgery.

Main Methods:

• A cadaveric model with 3 fresh human heads was used.
• Skull base defects were created and repaired using three techniques: Surgicel™ onlay, dural substitute underlay with dural sealant onlay, and dural substitute underlay with nasoseptal flap onlay with dural sealant.
• Pressure microsensors measured pressures in the sphenoid sinus and sella against CPAP settings from 5-20 cm H2O.

Main Results:

• 79%-95% of positive pressure reached the sphenoid sinus.
• Sellar pressure varied significantly by repair technique, being lowest with the third technique.
• The first repair technique failed at the lowest CPAP settings, while the third technique showed no breaches.

Conclusions:

• Skull base repair techniques differ in their ability to tolerate positive airway pressure.
• The second and third repair techniques demonstrated similar effectiveness in withstanding positive pressure.
• The nasoseptal flap technique appears most robust against CPAP-induced pressure.