A nurse is caring for a child diagnosed with Ventricular septal defect (VSD).
The child presents with poor feeding, fast breathing, and sweating with exertion.
Which of the following is the characteristic heart murmur associated with VSD?
A A continuous “machinery” murmur that is loudest below the left clavicle.
B A harsh holosystolic murmur that is best heard at the left lower sternal border.
C A systolic ejection murmur that is best heard at the left upper sternal border.
D A systolic ejection murmur that radiates to the back.
The correct answer and Explanation is :
The characteristic heart murmur associated with a Ventricular Septal Defect (VSD) is:
B: A harsh holosystolic murmur that is best heard at the left lower sternal border.
Explanation:
Ventricular Septal Defect (VSD) is a congenital heart defect characterized by an abnormal opening in the ventricular septum, which is the wall separating the left and right ventricles of the heart. This defect allows blood to flow from the left ventricle (which is under higher pressure) into the right ventricle (which is under lower pressure), causing a left-to-right shunt. This abnormal flow of blood leads to the characteristic murmur associated with VSD.
The murmur associated with VSD is typically described as a harsh holosystolic (or systolic) murmur. The term “holosystolic” means that the murmur lasts throughout the entire systolic phase of the cardiac cycle, from the first heart sound (S1) to the second heart sound (S2). The murmur occurs due to the turbulent blood flow from the left ventricle into the right ventricle through the defect.
This murmur is best heard at the left lower sternal border. The location is significant because the left lower sternal border is where the sound of the turbulent blood flow through the ventricular septal defect is most prominent. The murmur’s harsh quality and the timing throughout systole help differentiate it from other types of murmurs.
The other options refer to different types of murmurs associated with other cardiac conditions:
- Option A describes a continuous “machinery” murmur, which is more characteristic of a Patent Ductus Arteriosus (PDA).
- Option C refers to a systolic ejection murmur, typically associated with conditions like aortic or pulmonic stenosis.
- Option D describes a systolic ejection murmur that radiates to the back, which is also more typical of conditions such as aortic stenosis.
Thus, the correct answer is B: A harsh holosystolic murmur that is best heard at the left lower sternal border.