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Medical Science
Grade 11-12
Shock Types & Recognition Reference Cheat Sheet
A printable reference covering shock types, recognition signs, perfusion, blood pressure, pulse pressure, and hemodynamic profiles for grades 11-12.
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Shock is a life-threatening state in which the circulatory system cannot deliver enough oxygen and nutrients to body tissues. This reference covers the major shock types, early recognition signs, and key hemodynamic patterns used in medical science. Students need this cheat sheet because shock can worsen quickly, and fast recognition supports safer decision-making in clinical simulations and emergency care training.
Key Facts
- Shock is present when tissue perfusion is inadequate, even if the blood pressure is still in the normal range.
- Mean arterial pressure can be estimated with MAP = diastolic BP + 1/3 pulse pressure.
- Pulse pressure is calculated with pulse pressure = systolic BP - diastolic BP.
- Cardiac output is calculated with CO = heart rate x stroke volume.
- Hypovolemic shock usually has low preload, low cardiac output, high systemic vascular resistance, tachycardia, cool skin, and narrow pulse pressure.
- Cardiogenic shock usually has high preload, low cardiac output, high systemic vascular resistance, pulmonary congestion, and signs of poor perfusion.
- Distributive shock often has low systemic vascular resistance and widened pulse pressure, especially early in septic or anaphylactic shock.
- Obstructive shock occurs when blood flow is physically blocked, such as in cardiac tamponade, tension pneumothorax, or massive pulmonary embolism.
Vocabulary
- Shock
- A critical condition in which the body cannot maintain enough tissue perfusion to meet cellular oxygen needs.
- Perfusion
- The delivery of oxygen-rich blood through capillaries to body tissues.
- Preload
- The volume of blood returning to the heart before contraction, closely related to ventricular filling.
- Afterload
- The pressure or resistance the heart must pump against to move blood into the arteries.
- Systemic Vascular Resistance
- The resistance to blood flow created by the diameter and tone of systemic blood vessels.
- Mean Arterial Pressure
- An estimate of the average pressure driving blood through the circulation during one cardiac cycle.
Common Mistakes to Avoid
- Waiting for very low blood pressure before identifying shock is wrong because early compensated shock can have normal blood pressure with tachycardia and poor perfusion.
- Assuming all shock causes cold skin is wrong because early distributive shock can cause warm, flushed skin from vasodilation.
- Confusing cardiogenic shock with hypovolemic shock is wrong because cardiogenic shock often has fluid overload signs, while hypovolemic shock has reduced circulating volume.
- Ignoring mental status changes is wrong because anxiety, confusion, or decreased alertness can be early signs of reduced brain perfusion.
- Using one vital sign alone is wrong because shock recognition requires patterns, including heart rate, blood pressure, skin signs, capillary refill, urine output, and patient history.
Practice Questions
- 1 A patient has a blood pressure of 90/60 mmHg. Calculate the pulse pressure and estimate the mean arterial pressure.
- 2 A patient has a heart rate of 120 beats per minute and a stroke volume of 50 mL. Calculate the cardiac output in L/min.
- 3 A trauma patient has cool clammy skin, heart rate 132, narrow pulse pressure, delayed capillary refill, and suspected internal bleeding. Which shock type is most likely?
- 4 Explain why a patient in early septic shock may have warm skin and a bounding pulse even though tissue perfusion is becoming inadequate.