Table 2. Clinical characteristics and laboratory and ultrasonographic findings of IHPS according to serum bicarbonate levels.
| Variable | Bicarbonate ≥30 mmol/L (N=16) | Bicarbonate <30 mmol/L (N=51) | p-value | |
|---|---|---|---|---|
| Full term | 16 (100.0) | 48 (94.1) | 0.526 | |
| Male | 15 (93.8) | 41 (80.4) | 0.327 | |
| Birth weight (kg) | 3.27±0.45 | 3.15±0.48 | 0.455 | |
| Age (d) | 46.27±27.76 | 40.43±18.83 | 0.405 | |
| Symptom duration (d) | 15.73±10.19 | 11.74±10.50 | 0.260 | |
| Frequency of vomiting (d) | 4.18±1.32 | 3.72±1.41 | 0.321 | |
| Weight at diagnosis (kg) | 4.24±0.74 | 4.52±0.97 | 0.352 | |
| Weight loss after symptom | 8 (50.0) | 10 (19.6) | 0.006 | |
| Total bilirubin (mg/dL) | 4.62±3.99 | 3.32±3.52 | 0.303 | |
| Electrolyte | ||||
| Sodium (mEq/L) | 135.18±3.12 | 138.19±2.62 | 0.011 | |
| Potassium (mEq/L) | 4.02±0.48 | 5.02±0.56 | 0.023 | |
| Chloride (mEq/L) | 93.94±7.42 | 106.02±3.70 | 0.015 | |
| Pyloric size | ||||
| Pyloric length (mm) | 23.65±2.76 | 18.56±2.74 | 0.015 | |
| Muscle thickness (mm) | 4.90±0.95 | 4.91±1.15 | 0.452 | |
| Postoperative vomiting | 8 (50.0) | 9 (17.6) | 0.017 | |
Values are presented as number (%) or mean±standard deviation.
IHPS: infantile hypertrophic pyloric stenosis.
Normal range for electrolyte, sodium: 135–145 mEq/L, potassium: 3.5–5.5 mEq/L, chloride: 97–110 mEq/L. Continuous data are compared using student’s t-test and discrete data are compared using Chi-square tests.