Comparison of parameters: before and after surgery for VSD
| Patient | Age (months) | Nitrate in PA (μmol/l) | PPA (mm Hg) | Qp/Qs | Pp/Ps | Rp/Rs |
|---|---|---|---|---|---|---|
| 1 | Before (4) | 100 | 29 | 4.84 | 0.71 | 0.15 |
| After (12) | 22 | 14 | 1.07 | 0.27 | 0.20 | |
| 2 | Before (5) | 55 | 35 | 1.82 | 0.57 | 0.33 |
| After (36) | 30 | 18 | 1.05 | 0.31 | 0.24 | |
| 3 | Before (2) | 50 | 50 | 4.81 | 0.97 | 0.21 |
| After (16) | 39 | 16 | 1.00 | 0.31 | 0.31 | |
| 4 | Before (48) | 39 | 10 | 1.07 | 0.20 | 0.05 |
| After (70) | 22 | 18 | 1.00 | 0.22 | 0.26 |
PA, pulmonary artery; PPA, mean pulmonary arterial pressure; Pp/Ps, pulmonary to systemic systolic pressure ratio; Qp/Qs, pulmonary to systemic flow ratio; Rp/Rs, pulmonary to systemic vascular resistance ratio (normally less than 0.3).