Site of RVOT obstruction in TOF – MCQ – Answer
The commonest site of right ventricular outflow obstruction in Tetralogy of Fallot is – Correct answer: c) Infundibular (subvalvar) pulmonary stenosis
Obstruction can be at other locations and there could be a combination of lesions. Infundibular spasm with dynamic worsening of right ventricular outflow obstruction is thought to be one of the pathophysiological mechanisms of cyanotic spells in Tetralogy of Fallot. Immature respiratory center has an important role in the tachypnea leading on to the spell.
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