A ventricular septal defect produces a holosystolic murmur. Blood abnormally flows from the LV (high pressure) to the RV (low pressure) creating turbulent blood flow and a holosystolic murmur ...

Heart murmurs can occur due to turbulent blood flow in or near the heart ... it's known as a ventricular septal defect. These holes can affect how blood flows in and through your heart.