Categories: Respirology/ ICU

Pulmonary Embolism causing Obstructive Shock: Mechanism

Obstructive shock occurs due to obstruction of the cardiovascular system. Commonly due to PE, Tension pneumothorax and Tamponade.

HOW? PE results in elevated RV preload and strain (high CVP and RV dilation).

Typical clinical presentation is hypotension, skin vasoconstriction and distended JVP. A pulsus paradoxus can often be found.


  1. Oxford Desk Reference: Critical Care. Carl Waldmann, Neil Soni, Andrew Rhodes. 2008. Oxford Press.
  2. Emergency Medicine: The Principles of Practice. Gordian W. O. Fulde. 2009. Elsevier Australia.
Get Medical Pearls directly to your inbox every week!
Weekly posts with high yield medical knowledge, directly to your mailbox!
Dr. C Humphreys

Internal Medicine

Published by
Dr. C Humphreys

Recent Posts

Nocturia and OSA: Mechanism

Nocturia is a common symptom associated with obstructive sleep apnea. [1] Img Cred: Am J…

7 months ago

ASD vs. VSD Murmur Difference

ASD (Atrial Septal Defect) Wide, Fixed split S2 (in contrast to the normal variation in…

7 months ago

Mechanism of a Mixed Apnea

Mixed apneas are characterized by absent respiratory effort and airflow in the first section of…

2 years ago

How Does Hypothyroidism Cause Hypoventilation?

Although rare, the differential diagnosis of hypoventilation and hypercapnia respiratory failure includes hypothyroidism. It is…

2 years ago

Why is Pro-BNP/ BNP lower in Obesity?

B-type natriuretic peptide (BNP) is a hormone created in response to cardiac wall stretch due…

2 years ago

What is Peribronchovascular Distribution on CT imaging?

A common finding described on computed tomography (CT) imaging. A disease with a peribronchovascular distribution…

3 years ago

This website uses cookies.