Echocardiographic Evaluation Near a Leadless Pacemaker

Focus: How to identify pericardial effusion, signs of myocardial perforation, or echogenic masses/thrombus on or near the device.

1. Pericardial Effusion

• Best views: Parasternal long/short axis, apical 4-chamber, and subcostal views.
• Appearance: Anechoic (dark) fluid between pericardium and myocardium, often first seen posteriorly.
• Assessment: Measure effusion size, check for right atrial/ventricular diastolic collapse, and evaluate IVC plethora for tamponade physiology.

2. Signs Suggestive of Myocardial Perforation

• Device relation: Inspect the pacemaker’s contact site (RV septum or apex).
• Red flags: New/enlarging pericardial effusion, abnormal device position protruding beyond endocardial contour, or focal wall motion abnormality.
• Color Doppler: Can reveal abnormal flow near the device if perforation occurs.

3. Echogenic Masses or Thrombus

• Appearance: Hyperechoic or heterogeneous masses attached to/around the device.
• Differentiation: Thrombi tend to be mobile or pedunculated, while fibrotic tissue/artifacts are usually fixed and smooth.
• Contrast echo: Helps confirm thrombus versus artifact.
• Clinical relevance: Note size, mobility, and risk of embolization.

🔎 These observations guide detection, but final interpretation and management rest with the treating cardiologist.