Harrison's Principles of Internal Medicine

Medicine Simplified - Mini Harrison by Dr. Mukesh Bhatia

Key features of the book:

• Condensed version of Harrison's Principles of Internal Medicine
• Integrates anatomy, physiology, pathology, and clinical medicine
• Covers disease mechanisms, diagnostic criteria, and treatment
• Designed for MBBS students and postgraduate exam preparation
• Available in 3 volumes

What IS available in this library:

How to Score Well in Medicine (MBBS / PG Level)

1. Understand the Exam Pattern First

• Know whether it's theory (long/short answers) or MCQs or both
• Check past papers - examiners repeat topics heavily
• Focus on high-yield topics (common diseases, classic presentations)

2. How to Answer Theory Questions

For Long Answer Questions (LAQs):

For Short Answer Questions (SAQs):

• 4-6 bullet points per heading
• No need for full sentences - use crisp phrases
• Always add a diagram or flowchart - examiners love it
• Write the most important point first

3. High-Yield Topics in Medicine to Prioritize

4. Smart Study Techniques

• Read Mini Harrison or a concise text first - don't start with the full Harrison's
• Make one-page summaries for each disease (classic exam format)
• Use mnemonics - MUDPILES for anion gap, AEIOU for coma causes, etc.
• Revise 3 times - first read, then 48-hour revision, then weekly
• Solve MCQs daily - even during theory prep, it reinforces memory
• Group study for clinical cases - present cases to each other

5. Answer Writing Tips That Examiners Notice

• Use headings and subheadings - never write a wall of text
• Draw tables to compare (e.g., nephrotic vs nephritic, Type 1 vs Type 2 DM)
• Underline or box the diagnosis or key term in your answer
• Start with a definition - shows you know the concept
• Mention investigations in order - bedside → lab → imaging → special
• End with prognosis or a clinical pearl - shows depth
• Neat handwriting matters - even average content looks better when readable

6. One Week Before Exam

• Only revise your one-page summaries
• Go through previous year questions and mentally outline answers
• Focus on clinical features and treatment - these are most commonly asked
• Sleep well - fatigue kills recall more than under-preparation

The Answer Formulas for Medicine Exams

FORMULA 1 — Long Answer Question (LAQ) "10-marker"

1. Definition          → 1 line
2. Etiology            → classified list (congenital/acquired OR primary/secondary)
3. Pathophysiology     → brief flow (can draw arrow diagram)
4. Clinical Features   → Symptoms | Signs (two columns or bullets)
5. Investigations      → Routine | Specific | Imaging | Special
6. Diagnosis           → criteria if exists (WHO, Duke, Jones, etc.)
7. Treatment           → Non-pharmacological | Pharmacological | Surgical
8. Complications       → bullet list
9. Prognosis           → 1 line

Apply this to: Heart failure, TB, Cirrhosis, Nephrotic syndrome, Diabetes, etc.

FORMULA 2 — Short Answer Question (SAQ) "5-marker"

1. Definition          → 1 line
2. Causes / Types      → 3-4 bullets
3. Clinical Features   → 4-5 bullets
4. Investigations      → 3-4 bullets
5. Treatment           → 3-4 bullets

Keep each point short. No paragraphs. Use bullets only.

FORMULA 3 — "Enumerate / Write short notes on..." Questions

1. Define it briefly
2. Classify OR list causes
3. Key clinical points (3-4)
4. One key investigation
5. One key treatment line

These are 3-5 marker questions. Be concise. Examiners want breadth, not depth here.

FORMULA 4 — Clinical Case / Vignette Question

1. Diagnosis           → State it in first line confidently
2. Basis of diagnosis  → Point out clues from the case (age, symptoms, signs)
3. Differentials       → 2-3 alternatives briefly
4. Investigations      → To confirm + to rule out differentials
5. Treatment           → Specific to the diagnosis
6. Complications       → If asked

Example opener: "The most likely diagnosis is ___ based on the history of ___ and the finding of ___."

FORMULA 5 — Investigations Question

1. Bedside / Clinical  → pulse, BP, urine output, SpO2
2. Basic Labs          → CBC, LFT, RFT, electrolytes, blood sugar
3. Specific Labs       → e.g., ANA for SLE, ASO titre for RF, LDH for hemolysis
4. Imaging             → X-ray → USG → CT/MRI (least to most invasive)
5. Special / Invasive  → biopsy, bronchoscopy, endoscopy

FORMULA 6 — Treatment Question

1. General measures    → rest, diet, fluid, admission if needed
2. Treat the cause     → specific drug/surgery
3. Symptomatic         → pain, fever, nausea, etc.
4. Monitoring          → what to watch (labs, clinical signs)
5. Complications       → prevent or treat them
6. Follow-up           → when to review, what to check

FORMULA 7 — Comparison / Differentiate Between Two Conditions

Classic comparisons: Nephrotic vs Nephritic, Type 1 vs Type 2 DM, Crohn's vs UC, Pleural transudate vs exudate

FORMULA 8 — "Complications of..." Question

1. Immediate          → within hours
2. Early              → days to weeks
3. Late               → months to years
4. Systemic           → other organ involvement

Golden Rules for All Answers

The Long Answer Formula - Full Detail

STEP 1 — Definition (2-3 lines)

"[Disease] is defined as [key feature] characterized by [main finding] occurring due to [basic cause]."

"Heart failure is a clinical syndrome in which the heart is unable to pump sufficient blood to meet the metabolic demands of the body, or can do so only at the cost of elevated filling pressures."

• Never skip this - it earns marks even if the rest is weak
• One sentence is enough

STEP 2 — Classification / Etiology

Option A - Classification first, then causes under each:

Classification:
  A. By onset     → Acute / Chronic
  B. By side      → Left / Right / Biventricular
  C. By function  → Systolic / Diastolic

Etiology:
  Under each class, list 3-4 causes

Option B - Direct causes list:

1. Congenital
2. Acquired
   a. Infective
   b. Inflammatory
   c. Metabolic
   d. Neoplastic
   e. Vascular
   f. Iatrogenic

Tip: Use the surgical sieve VITAMIN CD as a memory aid: Vascular, Infective, Traumatic, Autoimmune, Metabolic, Iatrogenic, Neoplastic, Congenital, Degenerative

STEP 3 — Pathophysiology

Cause
  ↓
Primary defect (organ/cell level)
  ↓
Compensatory mechanism activated
  ↓
Compensation fails
  ↓
Clinical syndrome appears

LV dysfunction
  ↓
Reduced cardiac output
  ↓
RAAS + SNS activated (compensatory)
  ↓
Fluid retention → preload ↑ → further strain
  ↓
Pulmonary congestion + peripheral edema

• 5-8 lines is enough
• Draw it as a diagram in the answer sheet - saves time and looks impressive

STEP 4 — Clinical Features

Symptoms (what patient feels):

• List 5-7 symptoms
• Start with the most classic/common
• Mention onset, duration if relevant

Signs (what doctor finds):

• Vital signs first (pulse, BP, temperature, RR)
• General examination
• Specific system examination findings
• Use medical terms: tachycardia, hepatomegaly, crepitations, etc.

STEP 5 — Investigations

A. Bedside
   - Pulse oximetry, urine output, ECG

B. Routine Blood Tests
   - CBC, RFT, LFT, electrolytes, blood glucose, ESR, CRP

C. Specific Blood Tests
   - Disease-specific markers (e.g., BNP in HF, troponin in MI, ANA in SLE)

D. Imaging
   - X-ray (cheapest, first)
   - Ultrasound
   - CT scan
   - MRI (most expensive, last)

E. Special / Invasive
   - Biopsy, bronchoscopy, echo, cardiac catheterization
   - Only mention if truly relevant

For each investigation, add what you expect to find: "Chest X-ray - cardiomegaly, pulmonary venous congestion, Kerley B lines"

STEP 6 — Diagnosis / Diagnostic Criteria

• Heart Failure → Framingham criteria
• Rheumatic Fever → Jones criteria (2015 revised)
• Infective Endocarditis → Duke criteria
• TB → WHO criteria
• SLE → ACR/EULAR 2019 criteria
• Diabetes → ADA criteria
• PE → Wells score

STEP 7 — Treatment

A. General / Supportive
   - Rest, diet modification, fluid restriction, O2 if needed
   - Admit if severe

B. Treat the Underlying Cause
   - Address the root cause specifically

C. Pharmacological Treatment
   - First line drugs (with dose if you know it)
   - Second line / add-on
   - Drug classes are fine if you forget exact names

D. Non-pharmacological
   - Lifestyle, physiotherapy, counseling

E. Surgical / Interventional
   - Only if applicable (e.g., valve replacement, CABG, dialysis)

F. Monitoring
   - What labs / signs to monitor and how often

STEP 8 — Complications

A. Acute / Immediate     → life-threatening, hours-days
B. Subacute / Early      → days to weeks
C. Chronic / Late        → months to years
D. Systemic              → involving other organs

Cardiac / Renal / Hepatic / Neurological / Hematological complications

STEP 9 — Prognosis (closing line)

• Mortality rate if known
• What improves or worsens prognosis
• Any scoring system (e.g., Child-Pugh for cirrhosis, NYHA class for HF)

"Prognosis depends on the underlying etiology and functional class. With optimal medical therapy, 5-year survival in HFrEF is approximately 50%."

The Winning Layout on Paper

Q. Discuss Heart Failure                              [10 marks]

1. DEFINITION
   _______________________________________________

2. CLASSIFICATION / ETIOLOGY
   _______________________________________________

3. PATHOPHYSIOLOGY
   [flowchart diagram here]

4. CLINICAL FEATURES
   Symptoms          |    Signs
   __________________|____________________

5. INVESTIGATIONS
   A. Bedside   B. Blood   C. Imaging   D. Special

6. DIAGNOSTIC CRITERIA
   _______________________________________________

7. TREATMENT
   A. General   B. Drugs   C. Surgical

8. COMPLICATIONS
   _______________________________________________

9. PROGNOSIS
   _______________________________________________

Time Management for LAQs

How to Answer "Management of..." Questions

THE MASTER FORMULA

1. Initial Assessment
2. Diagnosis Confirmation
3. General Measures
4. Specific Treatment
5. Monitoring
6. Complications Management
7. Follow-up / Long-term care

STEP 1 — Initial Assessment (ABC First)

A - Airway         → is it patent?
B - Breathing      → RR, SpO2, work of breathing
C - Circulation    → pulse, BP, CRT, JVP
D - Disability     → GCS, neurological status
E - Exposure       → full examination, temperature

• History - duration, severity, triggers, past history, drug history
• Examination - relevant system findings
• Severity assessment - mild / moderate / severe (use scoring if available)

Example for Asthma: Use PEFR, SpO2, RR, ability to speak to classify severity

STEP 2 — Confirm the Diagnosis

- State what investigations you need to confirm
- What result confirms it
- Rule out differentials

Do NOT skip this - management flows from diagnosis

STEP 3 — General / Supportive Measures

1. Hospitalization   → admit if moderate/severe
2. Rest              → bed rest if acute phase
3. Diet              → specific dietary advice
4. IV access         → establish in sick patients
5. Fluid balance     → IV fluids if needed, monitor I/O
6. Oxygen            → if SpO2 < 94%, give O2 by mask

• Positioning (head-end elevation in HF, left lateral in pregnancy)
• Fasting / NPO if GI disease or pre-surgery
• Isolation if infectious

STEP 4 — Specific / Pharmacological Treatment

Sub-structure for drugs:

A. First-line treatment
   - Drug name + class + dose + route + duration

B. Second-line / Add-on
   - When to add, what to add

C. Adjuncts / Supportive drugs
   - Antipyretics, antiemetics, proton pump inhibitors, etc.

D. Drugs to AVOID
   - Always mention contraindicated drugs - examiners love this

Template for writing a drug:

"[Drug name] ([class]) [dose] [route] [frequency] for [duration] - mechanism/reason"

"Furosemide (loop diuretic) 40mg IV BD - to relieve pulmonary congestion by reducing preload"

STEP 5 — Surgical / Interventional (if applicable)

- Indications for surgery / procedure
- Name of procedure
- Timing (emergency vs elective)

• CABG / PCI in MI
• Valve replacement in severe valvular disease
• Dialysis in severe AKI/CKD
• Chest drain in massive pleural effusion
• Pericardiocentesis in cardiac tamponade

STEP 6 — Monitoring

A. Clinical monitoring
   - Vital signs: pulse, BP, RR, temperature, SpO2
   - Fluid balance: input/output chart
   - Symptom response: breathlessness, pain, fever, etc.

B. Laboratory monitoring
   - Which labs, how often
   - e.g., renal function on ACE inhibitors
   - e.g., INR on warfarin

C. Drug toxicity monitoring
   - Side effects to watch for
   - e.g., hypokalemia with diuretics
   - e.g., hepatotoxicity with anti-TB drugs

D. Disease-specific monitoring
   - e.g., PEFR in asthma
   - e.g., urine output in AKI
   - e.g., blood glucose in DM

STEP 7 — Follow-up and Long-term Management

- When to review (1 week, 1 month, etc.)
- What to check at review
- Long-term medications (maintenance therapy)
- Lifestyle modification
- Patient education
- Vaccination / prophylaxis if applicable
- Rehabilitation if needed

Special Management Scenarios

A. Emergency Management Formula

1. Call for help / activate emergency response
2. ABC resuscitation
3. IV access + bloods
4. Monitor (ECG, SpO2, BP)
5. Specific emergency drug/procedure
6. ICU admission if needed
7. Treat underlying cause

"This is a medical emergency. The patient should be managed as follows:"

B. "Outline the management" Formula

1. Resuscitation / stabilize
2. Specific treatment
3. Prevent recurrence

C. Chronic Disease Management Formula

1. Lifestyle modification (always first)
2. First-line drug monotherapy
3. Add second agent if target not reached
4. Combination therapy / specialist referral
5. Treat complications
6. Screening for comorbidities
7. Long-term follow-up

D. Drug Treatment Ladder (Step-up approach)

Step 1 → Lifestyle / non-pharmacological
Step 2 → Low-dose monotherapy
Step 3 → Full-dose monotherapy OR dual therapy
Step 4 → Triple therapy / specialist input
Step 5 → Advanced / invasive options

Power Phrases Examiners Like

One-Page Summary Card

MANAGEMENT = ABCDE + SPECIFIC + MONITOR + FOLLOW-UP

A  →  Assess severity (ABC, scoring system)
B  →  Basic investigations to confirm
C  →  Conservative / General measures
D  →  Drugs (first line → second line → adjuncts)
E  →  Emergency procedures if needed
     +
     Monitor (vitals, labs, drug toxicity)
     +
     Follow-up (lifestyle, maintenance, education)