Repeated massive pulmonary air embolism during pacemaker implantation

Area of Science:

• Cardiology
• Medical Devices
• Patient Safety

Background:

• Pacemaker implantation is a common procedure for cardiac rhythm management.
• Complications, though rare, can occur, including potentially fatal massive pulmonary air embolism.
• Sick sinus syndrome necessitates pacemaker implantation for symptom management.

Observation:

• A 72-year-old male with sick sinus syndrome developed repeated massive pulmonary air embolisms during pacemaker implantation.
• The patient received heavy sedation, leading to snoring, indicating upper airway obstruction.
• Air embolism events occurred after lead placement within the sheaths.

Findings:

• Marked negative intrathoracic pressure in sedated, snoring patients can facilitate air entry into the cardiovascular system.
• This negative pressure can overcome frictional resistance, allowing air to be drawn into the gap between the lead and sheath.
• Standard procedural techniques may be insufficient to prevent air embolism in high-risk scenarios.

Implications:

• Aggressive management of upper airway obstruction is crucial in sedated patients undergoing pacemaker implantation.
• Using sheaths with haemostatic valves is strongly recommended when upper airway obstruction cannot be adequately addressed.
• This case highlights the importance of recognizing and mitigating risks associated with air embolism during pacemaker procedures.