I have a vsd problem and i am underweight.i generally have high pulse rate. is this is the reason of being underweight or fail to gain weight?

Spell out VSD: To American doctors, VSD means ventricular septal defect. This heart defect has a wide spectrum of severity. If the VSD significantly effects heart function, you will be short of breath and retain water (gain weight). A less common result of VSD is endocarditis (infection inside the heart). This could cause weight loss and high pulse. You would also have a fever.