ABSTRACT: INTRODUCTION-Paediatric Congenital heart diseases [CHD] after corrective surgeries are under regular chest physical therapy [CPT] care for preventing post-operative complication. Comprehensive literature search was done and have not come across any studies showing the efficacy of combined Lung Recruitment Manoeuvres [LRM] and [CPT]. so study was conducted with aim to assess safety and efficacy of LRM as an adjunct to CPT on oxygenation, ventilation and on adverse events in operative paediatric CHD patients on mechanical ventilation. METHOD & METHODOLOGY- 48 patients operated case of CHD in the age group of Two to Fourteen years intubated more than 6 hours were included in the study. Study populations were divided into two groups. Control Group (Group A) that received CPT and Interventional Group (Group B) that received CPT with LRM. Patients were assessed pretreatment and 15 minutes post treatment on Oxygenation, Ventilation and adverse events during treatment. RESULT- There were statistically significant improvement in oxygenation and ventilation within the group with p<0.05.The study showed that there were no adverse events in both the groups. CONCLUSION- The oxygenation and ventilation improved in both the groups. No adverse events were observed in both groups. Both the interventions are safe and effective