A nurse is teaching the mother of a child who has cystic fibrosis and has a prescription for pancreatic enzymes three times per day. Which of the following statements indicates that the mother understands the teaching?

A patent ductus arteriosus (PDA) is a congenital heart defect associated with increased pulmonary blood flow. In normal fetal circulation, the ductus arteriosus allows blood to bypass the lungs since the baby receives oxygen from the mother's placenta. After birth, the ductus arteriosus should close, redirecting blood flow to the lungs for oxygenation. However, in some infants with PDA, the ductus arteriosus remains open, causing an abnormal connection between the aorta and the pulmonary artery. As a result, oxygenated blood from the aorta flows back into the pulmonary artery, increasing the workload on the lungs.

The other options are as follows:
A. Coarctation of the aorta - Coarctation of the aorta is a narrowing of the aorta, which obstructs blood flow and leads to increased blood pressure in the upper body and reduced blood flow to the lower body.
C. Tetralogy of Fallot - Tetralogy of Fallot is a combination of four heart defects that results in decreased pulmonary blood flow due to a ventricular septal defect (VSD), overriding aorta, pulmonary stenosis, and right ventricular hypertrophy.
D. Tricuspid atresia - Tricuspid atresia is a congenital heart defect where the tricuspid valve does not develop correctly, resulting in an absent or abnormal tricuspid valve. This defect prevents blood flow from the right atrium to the right ventricle and, therefore, reduces pulmonary blood flow.

Hirschsprung disease is a condition where nerve cells are missing from parts of the intestine, leading to problems with bowel movements. The treatment for Hirschsprung disease often involves surgery to remove the affected portion of the bowel and create a temporary ostomy (stoma). An ostomy is an opening in the abdominal wall through which waste material can pass into an external pouch, bypassing the affected section of the intestine.
The correct statement by the parent that indicates an understanding of the teaching is C. The parent is expressing relief that the ostomy is temporary, meaning it is not a permanent situation. This response indicates that the parent has been informed about the nature of the ostomy and its planned duration, which is an essential aspect of preoperative teaching.
Let's go through the other options and explain why they are not the best choices:
A. "I'm glad my child will have normal bowel movements now." This statement is not accurate because, after the initial surgery with the creation of a temporary ostomy, the child will not have normal bowel movements. The ostomy is created to bypass the affected part of the intestine, and the child's bowel movements will be directed through the ostomy until further surgery is performed to reconnect the intestine.
B. "I want to learn how to use my child's feeding tube as soon as possible." While learning how to use a feeding tube may be relevant for certain medical conditions, it is not specifically related to Hirschsprung disease or the planned initial surgery. Hirschsprung disease primarily affects the bowel and its function, not the child's ability to eat.
D. "I want to learn how to empty my child's urinary catheter bag." Hirschsprung disease does not directly impact the urinary system, so there is no specific reason for the parent to learn how to empty a urinary catheter bag in the context of this condition or the planned surgery.