**Core Concept**
The question refers to a patent ductus arteriosus (PDA), a congenital heart defect characterized by the failure of the ductus arteriosus to close after birth, leading to abnormal blood flow between the aorta and pulmonary artery. This results in excessive blood flow to the lungs and potential left heart volume overload.

**Why the Correct Answer is Right**
A large PDA leads to pulmonary overcirculation, which causes increased pressure and volume overload in the left side of the heart. This can lead to left ventricular hypertrophy, pulmonary hypertension, and eventually, heart failure. The excess blood flow to the lungs can also cause pulmonary congestion, leading to respiratory symptoms. The increased workload on the left heart can also lead to failure of the mitral valve, resulting in mitral regurgitation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but it is likely incorrect because PDA does not typically cause decreased pulmonary blood flow.
**Option B:** This option is not provided, but it is likely incorrect because PDA does not typically cause decreased left ventricular volume.
**Option C:** This option is not provided, but it is likely incorrect because PDA does not typically cause increased systemic vascular resistance.

**Clinical Pearl / High-Yield Fact**
A large PDA can be life-threatening if left untreated, and surgical ligation or catheter-based closure is often required to prevent long-term complications.

**Correct Answer:** D.