pericardial effusion

例句：

1. 1.He was diagnosed with pericardial effusion and required immediate surgery.
   他被诊断出患有心包积液，需要立即进行手术。
2. 2. The patient's condition worsened after the pericardial effusion treatment.
   在心包积液治疗后，患者的病情恶化了。
3. 3. The doctor explained that pericardial effusion can be caused by various factors, including heart disease and infection.
   医生解释说，心包积液可以由多种因素引起，包括心脏病和感染。