Which feature of Pierre Robin sequence contributes to difficulty generating intraoral pressure during sucking?

Which feature of Pierre Robin sequence contributes to difficulty generating intraoral pressure during sucking?

• A. Micrognathia
• B. Posterior cleft palate
• C. Glossoptosis
• D. Nasal regurgitation

Answer: (B)

Generating intraoral pressure during sucking requires a sealed oral cavity created by the palate against the tongue. In Pierre Robin sequence, a posterior cleft palate directly disrupts that seal, so air leaks into the nasal cavity instead of building negative pressure in the mouth. This makes suction weak or ineffective. While micrognathia and glossoptosis contribute to airway obstruction and overall feeding difficulty, they don’t disrupt the oral seal as directly as a palatal defect does. Nasal regurgitation can occur with a palate defect, but it’s the incomplete posterior palate that mainly explains the trouble with generating intraoral pressure during sucking.

Generating intraoral pressure during sucking requires a sealed oral cavity created by the palate against the tongue. In Pierre Robin sequence, a posterior cleft palate directly disrupts that seal, so air leaks into the nasal cavity instead of building negative pressure in the mouth. This makes suction weak or ineffective. While micrognathia and glossoptosis contribute to airway obstruction and overall feeding difficulty, they don’t disrupt the oral seal as directly as a palatal defect does. Nasal regurgitation can occur with a palate defect, but it’s the incomplete posterior palate that mainly explains the trouble with generating intraoral pressure during sucking.