Congenital Heart Defects

NURS 201 - Introduction to congenital heart defects, their assessment, implications, and nursing care.

Fetal Heart Development:
- Fetal heart rate is detectable approximately on post-conceptual day 17.
- The four chambers of the heart and major arteries form during gestational weeks 2 through 8.
Oxygenation:
- Oxygenation of the fetus occurs via the placenta; the lungs are perfused but do not participate in gas exchange during fetal life.
Key Structures:
- Foramen Ovale:
- An opening between the atria that allows blood to flow from the right atrium to the left atrium, bypassing pulmonary circulation.
- Ductus Arteriosus:
- A fetal blood vessel connecting the pulmonary artery to the aorta, allowing blood to shunt away from the lungs.

Disorders Categorization:
- Decreased Pulmonary Blood Flow:
- Conditions include:
  - Tetralogy of Fallot
  - Tricuspid atresia
- Increased Pulmonary Blood Flow:
- Conditions include:
  - Patent Ductus Arteriosus (PDA)
  - Atrial Septal Defect (ASD)
  - Ventricular Septal Defect (VSD)
- Obstructive Disorders:
- Conditions include:
  - Coarctation of the aorta
  - Aortic stenosis
  - Pulmonary stenosis
- Mixed Disorders:
- Conditions include:
  - Transposition of the great vessels (TGV)
  - Total anomalous pulmonary venous return (TAPVR)
  - Truncus arteriosus
  - Hypoplastic left heart syndrome

Definition:
- A defect characterized by a "hole" in the wall separating the atria.
Pathophysiology:
- Allows oxygen-rich blood to leak from the left atrium into the right atrium, mixing with oxygen-poor blood.
Heart Sounds:
- Common findings include:
- Right ventricular heave
- Fixed split-second heart sound
- Systolic ejection murmur
Symptoms:
- Many infants are asymptomatic; small ASDs may close spontaneously.
- Larger defects may require surgical intervention.
Adult Symptoms (by age 30):
- Shortness of breath
- Palpitations
- Fatigue
- Swelling in legs, feet, or abdomen
- Heart murmurs

Definition:
- Persistence of the ductus arteriosus, a fetal blood vessel that normally closes shortly after birth.
Pathophysiology:
- Results in abnormal blood flow between the aorta and pulmonary artery, causing increased lung blood flow.
Affect on Newborns:
- Common in those with respiratory problems like hypoxia, especially in preterm infants.
Heart Sounds:
- Characteristic continuous, machine-like murmur, loudest under the left clavicle, at the first and second intercostal spaces.
Complications:
- Increased blood volume returning to lungs raises lung pressure, potentially resulting in pulmonary hypertension.

Definition:
- A congenital narrowing of the aorta, limiting oxygenated blood flow to the lower body.
Clinical Sign:
- Discrepancy in blood pressure and pulsations between the arms and legs.
Symptoms:
- Many infants or children remain asymptomatic; frequently unnoticed until adulthood.
Heart Sounds:
- Murmurs are usually absent unless accompanied by an additional heart defect.

Definition:
- A defect in the septum separating the ventricles; classified as an acyanotic congenital heart defect.
Symptoms:
- Symptoms manifest a few weeks after birth; no cyanosis initially.
- Uncorrected VSD may lead to increased pulmonary vascular resistance.
Heart Sounds:
- Characteristic holosystolic (or pansystolic) harsh murmur heard along the left sternal border, starting at S1 and extending to S2 due to regurgitation.
Consequences of Large VSD:
- Poor growth, excessive sweating, and tachypnea (rapid breathing).

Definition:
- A combination of four specific heart defects:
- Ventricular septal defect
- Dextroposition of the aorta
- Pulmonary outflow obstruction or narrowing
- Right ventricular hypertrophy
Risk Factors:
- Maternal alcoholism
- Maternal diabetes mellitus (DM)
- Maternal age over 40
- Down syndrome
- Family history of the condition
Symptoms:
- Low blood oxygen saturation with or without cyanosis observed at birth or in infancy.
- Patients may experience