Table 1.

Classification of massive pulmonary embolism.

Society	Category	Criteria
American Heart Association	Massive	Hemodynamic instability manifested by one of the following
		Systolic blood pressure < 90 mmHg for >15 min
		Requirement of inotropes
		Signs of shock
		Decrease from baseline Systolic blood pressure (BP) > 40 mmHg
		Cardiac arrest
		Significant symptom manifestation
		Hypotension
		Tissue hypoperfusion
		Hypoxemia.
European Society of Cardiology	High risk	Cardiovascular shock or persistent hypotension manifested by one of the following
		Cardiac Arrest with a need for cardiopulmonary resuscitation
		Obstructive shock with Systolic BP < 90 mmHg or vasopressors required to achieve a BP ≥90 mmHg despite adequate filling status and-organ hypoperfusion (altered mental status; cold, clammy skin; oliguria/anuria; increased serum lactate)
		Persistent hypotension manifested by Systolic BP < 90 mmHg or systolic BP drop ≥40 mmHg, lasting longer than 15 min and not caused by new-onset arrhythmia, hypovolaemia, or sepsis