A newborn baby had normal APGAR score at birth and developed excessive frothing and choking on attempted feeds. The investigation of choice is –
**Core Concept**
The excessive frothing and choking on attempted feeds in a newborn baby can be indicative of a congenital anomaly in the upper gastrointestinal tract. This condition is related to the abnormal function of the esophageal sphincter or the presence of an obstruction.
**Why the Correct Answer is Right**
The investigation of choice in this scenario is an **esophageal atresia** or **tracheoesophageal fistula (TEF)**. These anomalies occur due to the incomplete separation of the esophagus and trachea during fetal development. The esophagus fails to connect properly with the stomach, leading to an obstruction or a fistulous connection between the esophagus and trachea. This results in feeding difficulties, excessive frothing, and choking. A chest X-ray, specifically a **swallow study**, is the investigation of choice to diagnose these conditions.
**Why Each Wrong Option is Incorrect**
* **Option A:** An upper GI series with barium is not the first-line investigation for suspected esophageal atresia or TEF, as it may cause aspiration of barium into the lungs.
* **Option B:** An abdominal ultrasound may help identify gastrointestinal anomalies, but it is not specific for diagnosing esophageal atresia or TEF.
* **Option C:** A complete blood count (CBC) may be used to assess for any underlying infection or inflammation, but it does not help diagnose the underlying cause of feeding difficulties.
**Clinical Pearl / High-Yield Fact**
In newborns with suspected esophageal atresia or TEF, it is essential to perform a **swallow study** (or an X-ray with a nasogastric tube) before attempting any oral feeding, as this can lead to aspiration and respiratory complications.
**Correct Answer:** C. Chest X-ray with a swallow study