Obstructive Shock

Question 1

Definition of obstructive shock?

Answer 1

Blood cannot reach tissues due to obstruction.

Question 2

Causes of obstructive shock?

Answer 2

Pulmonary embolism, pneumothorax, hemothorax, cardiac tamponade.

Question 3

What is cardiac tamponade?

Answer 3

Fluid buildup in pericardial sac impairing heart contraction.

Question 4

Sequence of tamponade events?

Answer 4

Fluid compresses heart

Chambers cannot expand

Blood backs up systemically

Lungs receive inadequate blood

Body receives inadequate blood

Question 5

What causes pulmonary embolism?

Answer 5

Foreign body blocking pulmonary artery.

Question 6

Most pulmonary emboli originate from?

Answer 6

DVT (Deep Vein Thrombosis) in lower leg.

Question 7

Other emboli origins?

Answer 7

Pelvis, kidneys, arms, right heart chambers.

Question 8

Why does PE cause shock?

Answer 8

Increased Right ventricle pressure → septum shift → decreased Left ventricle preload → hypotension.