A neonate has recurrent attacks of abdominal pain, restless irritability and diaphoresis on feeding. Cardiac auscultation reveals a nonspecific murmur. He is believed to be at risk for Mi. Likely diagnosis here is –
**Core Concept**
The neonate's symptoms suggest a congenital cardiac anomaly causing an abnormal communication between the aorta and the left-sided cardiac chambers, leading to excessive blood flow through the aorta, potentially resulting in aortic arch syndrome.
**Why the Correct Answer is Right**
The likely diagnosis is a patent ductus arteriosus (PDA), a congenital heart defect characterized by the failure of the ductus arteriosus to close after birth, causing a persistent left-to-right shunt. This condition leads to excessive blood flow through the aorta, resulting in the symptoms described. The nonspecific murmur heard on cardiac auscultation is likely due to the increased blood flow through the aortic valve and the continuous murmur heard over the left upper sternal border.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the symptoms described. Atrial septal defect (ASD) typically presents with symptoms such as failure to thrive, respiratory distress, and a fixed splitting of the second heart sound, which are not mentioned in the scenario.
* **Option B:** Tetralogy of Fallot (TOF) is a cyanotic congenital heart defect characterized by four components, including a ventricular septal defect, pulmonary stenosis, right ventricular hypertrophy, and an overriding aorta. The symptoms described do not match TOF, which typically presents with cyanosis and clubbing.
* **Option C:** Coarctation of the aorta is a congenital heart defect characterized by the narrowing of the aorta, typically at the level of the ductus arteriosus. While it can cause hypertension and other symptoms, it does not typically cause the symptoms described in the scenario.
**Clinical Pearl / High-Yield Fact**
The "continuous murmur" heard over the left upper sternal border in a neonate with a PDA is often described as a "machinery" murmur, which is a characteristic auscultatory finding of this condition.
**Correct Answer:** .