system
Perform all tasks and answer all questions accurately and completely.
human
Provide a more accessible phrase for the following jargon: "The surgeon performed a pericardiectomy to relieve pressure on the heart."

Relevant data:
The doctor removed part of the sac around the heart to reduce pressure on it.
gpt
The surgeon conducted a surgical procedure to remove a portion of the membrane surrounding the heart, which was contributing to potentially dangerous levels of cardiac pressure.