The platypnea-orthodeoxia syndrome.

Area of Science:

• Cardiology
• Pulmonology
• Medical Diagnostics

Background:

• Platypnea orthodeoxia syndrome (POS) is a rare condition causing dyspnea and hypoxia in the upright position.
• The underlying mechanism involves an atrial right-to-left shunt, often due to anatomical or functional interatrial communication or atrial septum deformity.
• Diagnosis can be challenging, requiring specific consideration of POS.

Purpose of the Study:

• To elucidate the pathophysiology, diagnostic challenges, and treatment of platypnea orthodeoxia syndrome (POS).
• To highlight the role of echocardiography in diagnosing POS.
• To emphasize the efficacy of interventional closure for POS treatment.

Main Methods:

• Utilizing transthoracic and transesophageal echocardiography in both supine and upright positions.
• Employing contrast medium and Doppler studies to identify the atrial shunt.
• Reviewing cases involving anatomical or functional causes of interatrial communication.

Main Results:

• Echocardiography in varying positions is crucial for diagnosing POS.
• Right-to-left atrial shunting is the primary pathophysiological mechanism.
• Interventional closure of the atrial septal defect leads to prompt symptom resolution.

Conclusions:

• POS diagnosis requires specific echocardiographic evaluation in different body positions.
• Prompt interventional closure of the atrial septal defect is an effective treatment for POS.
• Understanding the underlying shunt mechanism is key to managing POS.