Cardiovascular Physiology Part G: Circulatory Shock

Question 1

Circulatory Shock

Answer 1

inadequate blood flow (⇓ O2, nutrients to cells)

Question 2

Hypovolemic Shock

Answer 2

• ⇓ blood volume

- due to: blood loss, severe burns, diarrhea, vomiting

Question 3

Vascular Shock

Answer 3

• blood volume normal, but vessels expanded

- due to: systemic vasodilation of blood vessels ⇒ ⇓ bp

Question 4

Anaphylactic Shock

Answer 4

• example of vesicular shock
• allergic reactions
• due to: lots of histamine released from mast cells

Question 5

Septic Shock

Answer 5

• example of vesicular shock

- due to: bacterial toxins

Question 6

Cariogenic Shock

Answer 6

• example of vesicular shock
• pump failure ⇒ ⇓ CO
• heart cannot sustain blood flow

Question 7

3 Stages of Shock

Answer 7

1. Compensatory
2. Progressive
3. Irreversible

Question 8

Which stage of shock has mechanisms to restore homeostasis and involves baroreceptors, chemoreceptors and schema (lack of O2) of medulla?

Answer 8

Compensatory

Question 9

Compensatory stage of shock

trigger SNS, which……

Answer 9

• ⇑ HR, generalized vasoconstriction (except to heart, brain) = ⇑ bp
• ⇓ blood flow to kidneys triggers renin release - get angio II, aldosterone, ADH release ∴ vasocon, ⇑ Na+, H2O retention (maintain blood volume), ⇑ thirst

Question 10

Which stage of shock has mechanisms inadequate to restore homeostasis- requires intervention?

Answer 10

Progressive

Question 11

What happens in the progressive stage of shock?

Answer 11

1. ⇓ CO ∴ ⇓ bp in cardiac circulation ∴ ⇓ cardiac activity
2. ⇓ blood to brain ⇒ ⇓ cardiovascular control
3. damage to viscera due to ⇓ blood flow, especially kidneys (can lead to renal failure)

Question 12

What happens in the Irreversible stage of shock?

Answer 12

1. ⇓ CO ⇒ too little blood to heart ⇒ ⇓ CO

2. self-perpetuating cycle - leads to death