Thickened

A 4 week old male infant presents with 12 episodes of vomiting over 4 days, which progressively worsened over time and became projectile in nature. No bile or blood was present.

He is always hungry and often vomits after feeds. He has been exclusively breastfed so far.

He was born at term with a birth weight of 3.6kg, which is between the 50th to 75th centiles.

Select Relevant Investigations
Serum Electrolytes

Performed

Na: 137 mEq/L (133-148)
K: 5.5 mEq/L (4.5-6.6)
Cl : 98 mEq/L (100-115)
Full Blood Count

Performed

Hb: 11.4 g/dl (9.4-13.0)
WBC: 14,200/dL (6,000-18,000)
Platelets: 357,000/dL (150,00-450,000)
Pyloric Ultrasound

Performed

The pyloric muscles are thickened and the pyloric channel is elongated.
Arterial Blood Gases

Performed

PH: 7.48 (7.35 – 7.45)
pCO2: 47 mmHg (35 – 45)
pO2: 66 mmHg (50 - 80)
HCO3: 30 mEq/L (20 – 24)

Select Relevant Management
IV Fluids
Pyloromyotomy
Antiemetics
NG Tube insertion