<prompt> Which of the following condition doesnt present with cyanosis at bih: September 2006TOFTransposition of great vesselsPDATricuspid atresia  <response>: Ans. C: PDA Left to right shunts doesnt present with cyanosis, though they are prone for frequent chest infections. The three main L-R shunts are: ASD VSD PDA Right to left shunt are characterized by the presence of cyanosis, which leads to polycythemia and clubbing.They may either have pulmonary stenosis or pulmonary aerial hypeension. R-L shunt with pulmonic stenosis: - TOF - Tricuspid atresia - Ebstein anomaly - Transposition of great vessels - Total anomalous pulmonary venous connection R-L shunt with pulmonary aerial hypeension: - Eisenmenger syndrome 