What are the symptoms of atrial septal defect?

Atrial septal defect (ASD) may present with symptoms such as reduced exercise tolerance, recurrent respiratory infections, palpitations, peripheral edema, and cyanosis of the lips. The severity of symptoms correlates with the size of the defect; individuals with mild ASD may remain asymptomatic early in life, with symptoms gradually emerging as they age. If persistent dyspnea or orthopnea occurs, prompt medical evaluation and treatment are recommended.

1. Reduced Exercise Tolerance:

Exercise capacity is diminished compared to healthy individuals—simple activities such as brisk walking or climbing stairs may trigger shortness of breath and profound fatigue. Abnormal intracardiac shunting impairs systemic oxygen delivery, limiting the body’s ability to sustain physical activity; recovery typically occurs only after rest.

2. Recurrent Respiratory Infections:

Increased pulmonary blood flow leads to chronically weakened pulmonary defenses, predisposing patients to frequent upper and lower respiratory tract infections—including common colds and bronchitis. Recovery from these infections tends to be slower, and their frequency exceeds that observed in the general population. Chronic, recurrent infections may progressively impair cardiopulmonary function.

3. Palpitations:

Cardiac rhythm disturbances occur spontaneously—even during rest or minimal exertion. Structural abnormalities of the atria predispose to electrical instability, resulting in arrhythmias. With advancing age, the frequency of such episodes tends to increase, disrupting normal cardiac pumping efficiency.

4. Peripheral Edema:

As the condition progresses, chronic elevation of cardiac workload impedes venous return, causing fluid retention in dependent areas—particularly the lower extremities and ankles. Swelling worsens with prolonged standing or physical exertion.

5. Cyanosis of the Lips:

In advanced stages, systemic hypoxemia manifests as cyanosis—bluish discoloration of the lips and fingertips. This reflects a critical imbalance in cardiopulmonary oxygenation and a significant decline in systemic arterial oxygen saturation, serving as an important warning sign requiring timely clinical intervention.

In daily life, maintain moderate, low-intensity physical activity; avoid strenuous exercise. Ensure adequate sleep and balanced nutrition, practice appropriate thermal protection, minimize exposure to respiratory pathogens, and undergo regular cardiac evaluations to monitor functional stability.