🧠Step 7 — Student Memory Support

Cardiovascular System (CVS) Module 3rd Year

🧠 STEP 10 — Student Memory Support

🃏 1️⃣ High-Yield Flashcards

What is shock in pathology?

Shock is systemic tissue hypoperfusion causing cellular hypoxia, lactic acidosis, and organ dysfunction.

What is the most important cellular consequence of shock?

Reduced oxygen delivery → anaerobic glycolysis → lactic acidosis.

Name the major types of shock.

Hypovolemic, cardiogenic, septic, neurogenic, anaphylactic, and obstructive shock.

What causes hypovolemic shock?

Loss of circulating volume, such as hemorrhage, dehydration, burns, vomiting, or diarrhea.

What causes cardiogenic shock?

Failure of the heart to pump effectively, commonly due to myocardial infarction or severe arrhythmia.

What is sepsis?

Life-threatening organ dysfunction due to a dysregulated host response to infection.

What is septic shock?

Severe sepsis with profound circulatory and metabolic failure, causing hypotension, raised lactate, and organ dysfunction.

Why does septic shock cause hypotension?

Inflammatory mediators cause vasodilation, endothelial injury, capillary leakage, and reduced effective circulating volume.

What are the stages of shock?

Compensated/non-progressive, progressive, and irreversible stages.

What is the key feature of compensated shock?

Sympathetic response, RAAS, and ADH maintain vital organ perfusion; BP may still be near normal.

What happens in progressive shock?

Persistent hypoxia causes lactic acidosis, endothelial injury, capillary leak, microthrombi, and worsening organ dysfunction.

What makes irreversible shock irreversible?

Severe ATP depletion, mitochondrial damage, membrane failure, necrosis, and established multiorgan failure.

What is DIC?

Disseminated intravascular coagulation is systemic activation of coagulation causing microvascular thrombi and bleeding due to consumption of platelets and clotting factors.

What is the classic lab pattern of DIC?

Low platelets, prolonged PT/aPTT, raised D-dimer, and low fibrinogen.

What is the difference between acute and chronic hemorrhage?

Acute hemorrhage can cause hypovolemic shock; chronic hemorrhage commonly causes iron deficiency anemia.

🧠 2️⃣ Mnemonics

Mnemonic Title: Types of Shock

Mnemonic Word: HC-SANO
Meaning:
H — Hypovolemic
C — Cardiogenic
S — Septic
A — Anaphylactic
N — Neurogenic
O — Obstructive

Mnemonic Title: Stages of Shock

Mnemonic Word: CPI
Meaning:
C — Compensated
P — Progressive
I — Irreversible

Mnemonic Title: DIC Lab Pattern

Mnemonic Word: PLoD-F
Meaning:
P — Platelets low
Lo — Prolonged PT/aPTT
D — D-dimer high
F — Fibrinogen low

Mnemonic Title: Shock Organ Injury

Mnemonic Word: K-Li-Lu-H-B
Meaning:
K — Kidney: acute tubular injury
Li — Liver: centrilobular injury
Lu — Lung: diffuse alveolar damage
H — Heart: subendocardial ischemia
B — Brain: ischemic encephalopathy

📋 3️⃣ Memory Tables

Table 1: Commonly Confused Shock Types

Shock Type	Main Problem	Key Exam Clue
Hypovolemic	Loss of circulating volume	Hemorrhage, dehydration, burns
Cardiogenic	Pump failure	Myocardial infarction, arrhythmia
Septic	Infection + inflammatory vasodilation	Fever, hypotension, raised lactate
Neurogenic	Loss of sympathetic tone	Spinal injury, vascular pooling
Anaphylactic	Hypersensitivity vasodilation	Edema, airway symptoms
Obstructive	Mechanical block to circulation	Pulmonary embolism, tamponade

Table 2: Shock vs DIC

Feature	Shock	DIC
Core problem	Tissue hypoperfusion	Systemic coagulation activation
Main mechanism	Cellular hypoxia and lactic acidosis	Microthrombi + factor consumption
Key lab clue	Raised lactate	Low platelets, high D-dimer
Organ effect	Ischemic injury	Ischemia plus bleeding
Exam trap	Not just low BP	Not just bleeding

⚡ 4️⃣ Rapid Revision Points

Must Remember

• Shock means tissue hypoperfusion, not only hypotension.

• Main cellular event in shock is hypoxia → anaerobic glycolysis → lactic acidosis.

• Early shock may have near-normal BP due to compensation.

• Compensated shock uses sympathetic activation, RAAS, and ADH.

• Progressive shock shows acidosis, endothelial injury, capillary leak, and microthrombi.

• Irreversible shock means severe cellular injury and multiorgan failure.

• Sepsis is organ dysfunction due to dysregulated host response to infection.

• Septic shock involves vasodilation, capillary leak, endothelial injury, and metabolic failure.

• Acute hemorrhage causes hypovolemic shock; chronic hemorrhage causes anemia.

• DIC causes both thrombosis and bleeding.

• DIC labs: low platelets, prolonged PT/aPTT, raised D-dimer, low fibrinogen.

• Kidney injury in shock commonly presents as oliguria and rising creatinine.

🩺 5️⃣ Clinical Memory Hooks

Clinical Hook 1

Fever + hypotension + raised lactate → Septic shock

Clinical Hook 2

Trauma + massive blood loss + weak pulse → Hemorrhagic hypovolemic shock

Clinical Hook 3

Low urine output after hypotension → Acute tubular injury

Clinical Hook 4

Sepsis + bleeding from cannula site + high D-dimer → DIC

Clinical Hook 5

Near-normal hemoglobin after acute bleeding → Do not exclude hemorrhagic shock

⭐ 6️⃣ Starred High-Yield Exam Points

• ⭐ Shock = systemic tissue hypoperfusion causing cellular hypoxia and organ dysfunction.

• ⭐ Raised lactate is the key lab clue of tissue hypoperfusion.

• ⭐ Septic shock is driven by dysregulated host inflammatory response, not just bacteria in blood.

• ⭐ Early septic shock may show warm skin due to vasodilation.

• ⭐ DIC causes thrombosis and bleeding at the same time.

• ⭐ Classic DIC labs: low platelets + prolonged PT/aPTT + high D-dimer + low fibrinogen.

• ⭐ Acute hemorrhage → hypovolemic shock; chronic hemorrhage → iron deficiency anemia.

• ⭐ The fatal endpoint of shock is multiorgan dysfunction due to irreversible cellular injury.