THROMBOSIS - Super Simple Notes

🔑 First, The Basics

🔺 Virchow's Triad = 3 Reasons Thrombosis Happens

1️⃣ Endothelial Injury

• PRO-thrombotic side = Says "CLOT!" 🛑
• ANTI-thrombotic side = Says "DON'T CLOT!" ✅

Pro-clot team (bad guys when vessel is injured):

• Thromboplastin / Tissue Factor - starts the clotting cascade
• vWF (Von Willebrand Factor) - glues platelets to the vessel wall
• Platelet Activating Factor - activates + clumps platelets together
• Inhibitor of plasminogen activator - stops clot from dissolving

Anti-clot team (good guys, lost after injury):

• Heparin-like substance - boosts antithrombin III (breaks clots)
• Thrombomodulin - activates Protein C (breaks clots)
• tPA (Tissue Plasminogen Activator) - dissolves fibrin clots
• ADPase + PGI2 (Prostacyclin) - stop platelets from clumping

💡 Memory trick: When endothelium is injured, it exposes vWF + Tissue Factor → clot forms!

2️⃣ Altered Blood Flow

💡 Quick rule:

• Turbulence → Arterial & Cardiac clots
• Stasis → Venous clots

3️⃣ Hypercoagulable States (Thrombophilia)

Type 1: Hereditary (Born with it) 🧬

⭐ Most common inherited cause = Factor V Leiden mutation

Type 2: Acquired (Developed in life) 🏥

• Old age, bed rest, immobilization (plaster cast, long flights)
• Smoking, obesity

• Heart disease (MI, heart failure, rheumatic disease)
• Vascular disease (atherosclerosis, varicose veins)
• Thick blood conditions (polycythaemia, dehydration, nephrotic syndrome, cancers)
• Shock, trauma, burns, major surgery
• Late pregnancy
• Drugs: OCP (oral contraceptive pills), anaesthetics, hormone therapy

• Lupus anticoagulant antibody
• Anti-cardiolipin antibody

These antibodies paradoxically CAUSE clots, not prevent them!

🩸 Types of Thrombi

3 Sites:

1. Cardiac thrombi - in the heart (called vegetations)
2. Arterial thrombi
3. Venous thrombi

Color difference (easy gross exam question!):

💡 Memory trick: "Arteries = White & Wealthy (more platelets)", "Veins = Red & Fibrin-filled"

🧠 Ultra-Quick Recap (Read this before your exam!)

Thrombosis = BAD clot in intact vessel
Cause = Virchow's Triad (EVH):
  E = Endothelial injury → exposes vWF + TF → clot
  V = Blood flow altered → stasis/turbulence → clot  
  H = Hypercoagulable → hereditary or acquired
  
Most common inherited cause = Factor V Leiden
Arterial clot = White (platelets)
Venous clot = Red (RBCs + fibrin)
Turbulence → arterial/cardiac clots
Stasis → venous clots

White vs Red Infarct - Super Simple! 🧠

First - What is an Infarct?

An infarct = an area of dead tissue due to blocked blood supply (ischemia)

The Simple Difference in One Line:

🤔 WHY does blood leak back in Red Infarct?

• White infarct = tissue is dense/solid (like a brick) → blood cannot seep in even if flow returns
• Red infarct = tissue is loose/spongy → when blood flow returns, it floods the dead area = RED

Where Each One Occurs - The KEY Table

💡 Memory Trick - "HKLS"

❤️ Heart + 🫘 Kidney + 🫐 Spleen Think: "HKS = Hard, Keeps blood out, Solid"

🫁 Lung (dual: pulmonary + bronchial artery) 🟫 Liver (dual: portal vein + hepatic artery) 🌀 Intestine (loose + collaterals) 🧠 Brain (loose tissue, reperfusion)

Shape Difference

What Happens Over Time (Both types)

Day 1-2:   Area becomes necrotic (coagulative necrosis)
Day 4-7:   Neutrophils come in (inflammation)
Week 2:    Macrophages clean up the dead tissue
Week 3-4:  Fibroblasts come → Scar tissue forms
Final:     Firm, pale SCAR (in both types)

💡 Exception: Brain infarct → becomes liquefactive necrosis (turns into a fluid-filled cavity), NOT a scar!

⚡ Ultra-Quick Exam Recap

White infarct  = Pale, dry, solid organs, single blood supply
                 (Heart, Kidney, Spleen)

Red infarct    = Red, wet, loose/dual supply organs
                 (Lung, Liver, Intestine, Brain)

Key reason for RED = reperfusion into loose/spongy tissue
Key reason for WHITE = dense tissue blocks blood re-entry

Both end up as SCAR (except brain = fluid cavity)

🧠 Tonight & Tomorrow - Your Game Plan

🌙 TONIGHT (Most Important)

1. STOP studying by 10-10:30 PM

2. Do a "Brain Dump" right now (15-20 min only)

• Take a blank paper
• Write down every topic/keyword you remember WITHOUT looking at notes
• This actually strengthens recall pathways - it's called retrieval practice
• Don't panic at gaps - just move on

3. Only do LIGHT revision after that

• Just read your short notes/mnemonics (like the ones above)
• No deep studying - just gentle reminders
• Stop completely by 10:30 PM

4. Sleep - aim for 7 hours minimum

• Memory literally gets locked in during deep sleep
• Sleep deprivation is the #1 cause of exam blanking
• Set an alarm, don't pull an all-nighter

☀️ TOMORROW MORNING

1. Wake up with enough time - no rushing

• Rushing = cortisol spike = worse recall
• Give yourself at least 1.5 hours before the exam

2. Eat something - even if you don't feel like it

• Glucose fuels your brain
• Something simple: banana, toast, eggs - avoid heavy oily food
• Drink water - dehydration impairs memory significantly

3. Do ONE final light read (30 min max)

• Just scan your mnemonics and key tables
• Don't start new topics
• Don't re-read huge chapters

4. No last-minute panicked discussions with classmates

• "Did you study X?" conversations spike anxiety right before an exam
• Protect your headspace

📝 IN THE EXAM HALL - Dealing with Blanking

The moment you sit down, do THIS first:

• Write all your mnemonics, key words, tables in the margin/rough area
• Takes 3-5 minutes
• Gets everything OUT of your anxious brain and onto paper
• Then you're just copying from your own notes during the exam!

If you blank on a question:

1. Skip and come back - don't sit frozen
2. Write what you DO know - even partial answers get marks
3. Take 3 slow deep breaths - this genuinely lowers cortisol and restores recall (not a cliche - it's physiology)
4. Think of the mnemonic/trigger word first, not the full answer

Answer structure trick:

• Start every answer with a definition - you almost always know this
• Then write classification - you usually know this too
• By then your brain has "warmed up" and the rest flows

💭 About the Anxiety

• You study fine at home but blank in the exam
• You remember the answer RIGHT AFTER leaving the hall
• It feels like the knowledge "disappeared"

⚡ Tonight's Priority Order

Right now      → 15 min brain dump on blank paper
Next 1 hour    → Light scan of short notes only
10:00-10:30 PM → Stop. Put the books away.
10:30 PM       → Wind down (no phone doom scrolling)
11:00 PM       → Sleep
Tomorrow AM    → Eat, light read, early arrival
In exam        → Brain dump first, then open paper

⏰ 2 AM with Exam at 10 AM

RIGHT NOW - Sleep is the #1 priority

Your Timeline

2:00 AM  → Put everything down. Sleep NOW.
8:00 AM  → Wake up
8:00-8:20 → Eat something. Drink water.
8:20-9:20 → Light revision (1 hour only - mnemonics, key tables)
9:20-9:30 → Get ready, leave
9:50 AM  → In your seat, do rough paper brain dump
10:00 AM → Exam starts ✅

The Hard Truth

Studying from 2-4 AM on a saturated brain will not help you. You will not retain what you read. But it WILL make you groggy, slower, and more anxious at 10 AM.

For the 1 hour revision tomorrow morning

• Your mnemonics (like EVH, HKS, LLIB)
• Headings and definitions only
• Nothing new