Table 2. Treatment timeline.

PDA: patent ductus arteriosus; PAH: pulmonary arterial hypertension; PICU: pediatric intensive care unit

Events	Date
Diagnosed as PDA with PAH	15/12/2021
Referred to the tertiary care centre	23/02/2022
Lung infection and collapse; transferred to the PICU; and put on mechanical ventilator support.	25/02/2022
Pre-operative physiotherapy commencement (Table 3)	25/02/2022
The patient was weaned off from ventilator and put on oxygen support (4 L/min)	07/03/2022
The patient underwent PDA ligation surgery	16/03/2022
Postoperative physiotherapy begins	17/03/2022