Qp/Qs Ratio by Noninvasive Methods in Children With Shunt Dependent Pulmonary Circulation

The Accuracy of Qp/Qs Calculated by Noninvasive Methods in Children With Shunt Dependent Pulmonary Circulation

In pediatric cardiac patients with shunt dependent pulmonary circulation, Qp/Qs ratio is a important parameter indicating the balance of pulmonaty and systemic circulation.

This study will calculate Qp/Qs using variables measured using non-invasive monitors (cerebral oximeter and pulse oximeter). This value will be compared with Qp/Qs calculated using variables obtained from blood sample.

Blood sampling will be performed in both arterial and central venous lines.

Inclusion Criteria:

1. pediatric cardiac patients scheduled to cardiac operation (shunt dependent pulmonary circulation)
2. preoperative SpO2<97%

Exclusion Criteria:

1. unable to measure pulse oximeter or cerebral oximeter signal
2. unable to measure SaO2 or SmvO2
3. unstable vital sign