---

SURGERY EXAM ANSWERS (10 Marks Each)

Reference: SRB's Manual of Surgery

---

Q1. SHOCK

Definition

---

Classification of Shock

┌─────────────────────────────────────────────────────────┐
│                   TYPES OF SHOCK                        │
├───────────────┬──────────────────────────────────────────┤
│ TYPE          │ EXAMPLES                                 │
├───────────────┼──────────────────────────────────────────┤
│ Hypovolemic   │ Hemorrhage, burns, dehydration           │
│ Cardiogenic   │ MI, cardiac tamponade, arrhythmia        │
│ Distributive  │ Septic, anaphylactic, neurogenic         │
│ Obstructive   │ Pulmonary embolism, tension pneumothorax │
└───────────────┴──────────────────────────────────────────┘

In surgery, Hypovolemic (hemorrhagic) shock is the most common.

---

Grades of Hemorrhagic Shock (ATLS Classification)

---

Pathophysiology

Blood Loss
    ↓
↓ Venous return → ↓ Cardiac Output → ↓ BP
    ↓
Baroreceptor activation
    ↓
↑ Sympathetic response → Tachycardia, vasoconstriction
    ↓
Tissue hypoperfusion → Anaerobic metabolism → Lactic acidosis
    ↓
Cell death → MODS (Multi-Organ Dysfunction Syndrome)

---

Clinical Features

• Tachycardia (earliest sign)
• Cold, clammy, pale skin
• Restlessness and anxiety
• Thirst
• Oliguria

• Hypotension
• Tachypnea, air hunger
• Confusion, altered sensorium
• Anuria
• Cyanosis

---

Investigations

• CBC: Low Hb, Hct (if hemorrhagic)
• ABG: Metabolic acidosis, raised lactate
• RFT: Raised creatinine (renal compromise)
• Blood glucose: Often raised (stress response)
• Urine output: Monitor hourly (target >0.5 mL/kg/hr)
• CVP (Central Venous Pressure): Low in hypovolemia (<5 cm H2O)
• FAST ultrasound: For internal bleeding

---

Management

ABCDE Approach:

1. Airway - Ensure patent airway, O2 supplementation
2. 2 large bore IV cannulas (14-16G) - antecubital fossa
3. Fluid resuscitation:
   • Warm crystalloids - 1-2L Ringer's Lactate (preferred over NS)
   • Blood transfusion in Grade III & IV shock
   • Ratio: 1:1:1 (PRBC : FFP : Platelets) in massive transfusion
4. Control hemorrhage: Direct pressure, tourniquets, surgical hemostasis
5. Vasopressors (Noradrenaline, Dopamine) if fluid-unresponsive
6. Treat the cause: Surgery, antibiotics (septic shock)
7. Monitor: HR, BP, urine output, CVP, ABG every hour

Golden Hour concept - Aggressive resuscitation within the first hour saves lives.

---

Q2. DEEP VEIN THROMBOSIS (DVT)

Definition

---

Etiology - VIRCHOW'S TRIAD (The Cornerstone)

        ┌─────────────────────┐
        │   VIRCHOW'S TRIAD   │
        └─────────────────────┘
               /  |  \
              /   |   \
    Stasis  Hypercoag. Endothelial
   (Immob.) (OCP,cancer) (Trauma,surgery)

---

Pathophysiology

• Stasis + hypercoagulable state → platelet aggregation at valve sinuses
• Thrombus propagates proximally
• Red thrombus (fibrin + RBCs) forms
• Organization → fibrosis → valvular incompetence → post-thrombotic syndrome

---

Clinical Features

• Calf pain and tenderness
• Swelling of the affected limb
• Heaviness in the leg
• Skin discoloration (erythema)

• Homan's sign - Pain in calf on dorsiflexion of foot (not reliable, only 30% sensitive)
• Pitting edema of the affected limb
• Dilated superficial veins (collaterals)
• Skin warmth and erythema
• Phlegmasia Alba Dolens - massive DVT with white, painful, edematous limb
• Phlegmasia Cerulea Dolens - cyanotic, painful, edematous limb (limb-threatening)

---

Investigations

1. D-Dimer - Screening test (sensitive but not specific; negative D-dimer rules out DVT)
2. Doppler Ultrasonography - Investigation of choice; shows non-compressible vein
3. Venography - Gold standard (rarely done now)
4. Wells Score - Clinical probability scoring

• Score ≥2 = High probability; Score <2 = Low probability

---

Management

Prophylaxis (Prevention):

• Early ambulation post-surgery
• TED stockings (compression stockings)
• LMWH (Enoxaparin 40mg SC once daily)
• Intermittent pneumatic compression (IPC) devices
• Hydration

Treatment:

• Anticoagulation:
  • LMWH (Enoxaparin) - preferred initial therapy
  • Unfractionated Heparin (UFH) IV - in massive DVT or renal failure
  • Overlap with Warfarin (INR target 2.0-3.0) for 3-6 months
  • NOACs (Rivaroxaban, Apixaban) - now first-line in many guidelines
• Thrombolysis - Streptokinase/tPA in massive DVT with limb threat
• IVC filter - If anticoagulation contraindicated or recurrent PE
• Thrombectomy - Surgical, rarely required

---

Complications

• Pulmonary Embolism (PE) - most feared; can be fatal
• Post-thrombotic syndrome (chronic venous insufficiency)
• Venous ulceration
• Recurrent DVT

---

Q3. VARICOSE VEINS

Definition

---

Etiology

• Congenital valve incompetence
• Hereditary weakness of vein wall

• DVT (post-thrombotic)
• Pregnancy (increased pelvic pressure)
• Pelvic tumors/masses
• Arteriovenous fistula
• Klippel-Trenaunay syndrome

---

Pathophysiology

Incompetent perforator/saphenofemoral valve
            ↓
Retrograde flow (Reflux) under gravity
            ↓
↑ Venous pressure in superficial veins
            ↓
Dilatation and tortuosity of superficial veins
            ↓
Venous hypertension in skin microcirculation
            ↓
Lipodermatosclerosis → Ulceration

---

Clinical Features

• Aching, heaviness in legs (worse at end of day, better on elevation)
• Swelling of ankles
• Itching over varicosities
• Cosmetic concern

• Visible, dilated, tortuous veins (medial thigh and leg)
• Ankle edema
• Skin changes: Eczema, pigmentation (haemosiderin), lipodermatosclerosis
• Venous ulcer - medial malleolus (gaiter area), painless, sloping edges

---

Special Tests

---

Investigations

• Duplex Doppler Ultrasound - Investigation of choice (identifies reflux, patency of deep veins, perforator incompetence)
• Venography - Only if deep vein anatomy unclear
• Hand-held Doppler - Quick assessment of SFJ/SPJ incompetence

---

Management

Conservative:

• Elevation of limb
• Compression stockings (Class 2)
• Weight reduction
• Avoid prolonged standing

Surgical (Definitive):

1. Trendelenburg operation - Flush ligation of saphenofemoral junction (SFJ)
2. Stripping - Long saphenous vein stripped from groin to knee
3. Multiple stab avulsions - Removal of varicosities through tiny incisions
4. Subfascial perforator ligation (SEPS)

Minimally Invasive:

• Sclerotherapy - Injection of sclerosant (Sodium tetradecyl sulphate) into small varicosities
• EVLA (Endovenous Laser Ablation) - Laser energy destroys vein wall
• RFA (Radiofrequency Ablation) - Similar to EVLA
• Foam sclerotherapy - For larger veins

Complications of Varicose Veins:

• Hemorrhage (from rupture)
• Thrombophlebitis
• DVT
• Venous eczema
• Lipodermatosclerosis
• Venous ulcer
• Calcification (phleboliths)

---

Q4. BLOOD TRANSFUSION (BT) REACTIONS AND COMPLICATIONS

Classification of Transfusion Reactions

┌──────────────────────────────────────────────┐
│         TRANSFUSION REACTIONS                │
├─────────────────┬────────────────────────────┤
│   IMMUNOLOGICAL │    NON-IMMUNOLOGICAL        │
├─────────────────┼────────────────────────────┤
│ Acute hemolytic │ Circulatory overload        │
│ Febrile non-hem │ Air embolism                │
│ Allergic/anaph  │ Hypothermia                 │
│ TRALI           │ Metabolic (hypocalcemia,    │
│ Graft-vs-host   │  hyperkalemia, acidosis)    │
└─────────────────┴────────────────────────────┘

---

A. ACUTE HEMOLYTIC REACTION (Most Dangerous)

• Fever, chills, rigors
• Loin/back pain
• Chest pain, dyspnea
• Hemoglobinuria (red/cola-colored urine)
• Hypotension, shock
• DIC (Disseminated Intravascular Coagulation)
• Acute renal failure

1. STOP transfusion immediately
2. Keep IV line open with Normal Saline
3. Recheck blood group and cross-match
4. IV fluids to maintain urine output >100 mL/hr
5. Mannitol/Furosemide - forced diuresis
6. Treat DIC - FFP, platelets, cryoprecipitate
7. Renal support if needed

---

B. FEBRILE NON-HEMOLYTIC REACTION (Most Common)

• Slow/stop transfusion
• Paracetamol
• Leukocyte-depleted blood for future transfusions

---

C. ALLERGIC / ANAPHYLACTIC REACTION

• Stop transfusion
• Adrenaline (0.5 mg IM) for anaphylaxis
• Antihistamines, corticosteroids
• Bronchodilators for bronchospasm

---

D. TRALI (Transfusion-Related Acute Lung Injury)

• Donor antibodies against recipient leukocytes → non-cardiogenic pulmonary edema
• Acute respiratory distress within 6 hours
• Treatment: Supportive, O2, mechanical ventilation if needed

---

E. DELAYED HEMOLYTIC REACTION

• 5-10 days post transfusion
• Due to anamnestic antibody response
• Mild fever, falling Hb, jaundice

---

Other Complications

---

Q5. BURNS

Definition

---

Classification

A. By Depth:

┌────────────────────────────────────────────────────────────┐
│               DEPTH OF BURNS                               │
├───────────────┬──────────────┬───────────────┬─────────────┤
│ DEGREE        │ STRUCTURES   │ APPEARANCE    │ PAIN        │
├───────────────┼──────────────┼───────────────┼─────────────┤
│ 1st (Superf.) │ Epidermis    │ Red, dry      │ Painful     │
│ 2nd Superf.   │ Papillary    │ Blisters,wet  │ Very painful│
│ 2nd Deep      │ Reticular    │ Pale,moist    │ Less painful│
│ 3rd (Full)    │ Full skin    │ White/black,  │ Painless    │
│               │ thickness    │ leathery      │             │
│ 4th           │ Bone/muscle  │ Charred       │ Painless    │
└───────────────┴──────────────┴───────────────┴─────────────┘

B. By Extent - RULE OF NINES (Wallace's Rule):

         Head & Neck = 9%
              ─┬─
              ─┼─
    Arm = 9% ─┤├─ Arm = 9%
         Chest = 9%  Back = 9%
         Abd   = 9%  Back = 9%
              │
  Thigh 9% ──┤├── Thigh 9%
  Leg   9% ──┤├── Leg   9%
         Perineum = 1%
         
         Total = 100%

In children: Use Lund and Browder chart (more accurate - head is larger proportionally)

---

Severity Classification

---

Pathophysiology (Zones of Jackson)

     ┌─────────────────┐
     │   Zone of       │ ← Dead tissue (coagulation)
     │   COAGULATION   │
     ├─────────────────┤
     │   Zone of       │ ← Can survive with good care
     │   STASIS        │
     ├─────────────────┤
     │   Zone of       │ ← Heals spontaneously
     │   HYPEREMIA     │
     └─────────────────┘

---

Immediate/First Aid Management

1. Remove from source - Stop burning process
2. Airway first - Assess for inhalation injury (hoarse voice, singed nasal hair, facial burns, carbonaceous sputum)
3. Early intubation if inhalation injury (airway can swell rapidly)
4. Cool the burn - Run cool water for 20 minutes (NOT ice)
5. Wrap in clean, moist non-adherent dressing
6. Do NOT burst blisters
7. IV access - 2 large bore cannulas
8. Fluid resuscitation

---

Fluid Resuscitation - Parkland Formula

4 mL × Body weight (kg) × % TBSA burned = Total fluid in first 24 hrs

• Half given in first 8 hours (from time of burn, NOT admission)
• Half given in next 16 hours
• Fluid of choice: Ringer's Lactate (Hartmann's solution)
• Monitor urine output: 0.5-1 mL/kg/hr (30-50 mL/hr in adults)

• Total = 4 × 70 × 30 = 8400 mL in 24 hours
• First 8 hrs: 4200 mL; Next 16 hrs: 4200 mL

---

Definitive Management

---

Complications of Burns

---

Q6. GAS GANGRENE

Definition

---

Etiology and Causative Organisms

• C. novyi
• C. septicum
• C. histolyticum
• C. sordellii

These are Gram-positive, spore-forming, obligate anaerobes - found in soil and human intestine.

---

Predisposing Conditions

• War/compound wounds contaminated with soil
• Ischemic tissue (diabetic, peripheral vascular disease)
• Colorectal surgery (bowel flora)
• Compound fractures
• Crush injuries with devitalized muscle
• Immunocompromised patients

---

Pathogenesis (Etiopathology)

Contamination of wound with Clostridial spores
            ↓
Anaerobic environment (devitalized tissue, foreign bodies)
            ↓
Spores germinate → Vegetative forms multiply
            ↓
Production of TOXINS (Alpha toxin - Lecithinase C)
            ↓
Destruction of cell membranes → Muscle necrosis
            ↓
Gas production (CO2, H2, H2S) in tissues
            ↓
Systemic toxin absorption → Toxemia
            ↓
Multi-organ failure → Death (if untreated)

---

Clinical Features

Local Features:

• Pain - severe, out of proportion to wound appearance (earliest symptom)
• Wound appearance - dark, discolored, dirty brownish skin
• Discharge - thin, watery, brownish/serosanguineous, foul smelling
• Crepitus - gas bubbles felt on palpation (pathognomonic)
• Brawny edema of surrounding tissue
• Skin blistering with dark fluid
• Muscle - appears dark red to black, non-bleeding when cut, brick-like consistency

Systemic Features (Toxemia):

• High fever with tachycardia (disproportionate to fever)
• Anxiety, restlessness, terror (characteristic)
• Jaundice (hemolysis by toxins)
• Hypotension and shock
• Hemoglobinuria (dark urine)
• Progressive obtundation → coma → death

SRB mnemonic: The patient has a look of TERROR - anxious, frightened face is characteristic.

---

Investigations

1. X-ray of affected part - Gas in soft tissues (feathery pattern along fascial planes) - pathognomonic
2. Wound swab Gram stain - Gram-positive rods, few or no polymorphs
3. Culture - Anaerobic culture (takes time, not to wait for)
4. Blood tests: CBC (anemia, leukocytosis), RFT, LFT, coagulation profile
5. Blood culture - Positive in severe cases
6. CT scan - Better delineates extent of gas in soft tissues

---

Management

Emergency - 3-pronged approach:

• Immediate wide debridement - Key treatment
• Remove all dead, devitalized muscle (non-bleeding, non-contracting muscle must be excised)
• Amputation - If limb is extensively involved (life-saving)
• Leave wound open - no primary closure
• Re-explore in 24-48 hours

• High-dose Penicillin G - drug of choice (20-24 million units/day IV)
• Metronidazole - for anaerobic cover (500mg IV TDS)
• Clindamycin - inhibits toxin production (added in severe cases)

• 100% oxygen at 3 atmospheres
• Inhibits anaerobic growth
• Promotes phagocytosis
• Adjunct therapy (3 sessions in 24 hours if available)

Supportive:

• IV fluids, blood transfusion
• ICU care, vasopressors if needed
• Antitoxin (limited value)

---

Prevention

• Proper wound debridement
• Remove devitalized tissue and foreign bodies
• Leave contaminated wounds open
• Prophylactic penicillin for high-risk wounds
• Gas Gangrene Antitoxin (polyvalent) - prophylactically for war wounds
• Adequate tetanus prophylaxis

---

Prognosis

• Mortality: 20-30% even with treatment
• Untreated: 100% fatal
• Amputation is lifesaving when extensive muscle involvement

---

Q7. HOSPITAL ACQUIRED INFECTION (HAI) / NOSOCOMIAL INFECTION

Definition

---

Common Sites (Frequency)

┌────────────────────────────────────────────┐
│         SITES OF HAI (Frequency)           │
├────────────────────────────────────────────┤
│ 1. Urinary Tract Infection (UTI) - 35-40%  │
│ 2. Surgical Site Infection (SSI) - 15-20%  │
│ 3. Pneumonia (VAP) - 15-20%               │
│ 4. Bloodstream Infection (BSI) - 10-15%    │
│ 5. Others - 10%                            │
└────────────────────────────────────────────┘

---

Various Causes of HAI

1. Patient-Related Factors:

• Extremes of age (very young, very old)
• Malnutrition, immunosuppression
• Underlying diseases (diabetes, cancer, renal failure)
• Prolonged hospital stay
• Prior antibiotic therapy (disrupts normal flora)

2. Procedure-Related Factors:

• Invasive devices: Foley catheter, IV cannula, central venous catheter, endotracheal tube
• Surgical procedures (wound contamination)
• Prolonged operations (>2 hours)

3. Environmental Factors:

• Overcrowded wards
• Inadequate hand washing
• Contaminated equipment
• Poor sterilization techniques
• Infected healthcare workers

4. Antibiotic Overuse:

• Selection pressure → MRSA, VRE, ESBL-producing organisms

---

Common Causative Organisms

ESKAPE organisms - the most problematic MDR pathogens in hospitals: Enterococcus, S.aureus (MRSA), Klebsiella, Acinetobacter, Pseudomonas, Enterobacter

---

Preventive Measures

I. Standard Precautions (ALL patients):

1. Hand Hygiene - Most effective preventive measure
   • WHO 5 Moments: Before patient contact, before aseptic procedure, after body fluid exposure, after patient contact, after touching patient surroundings
   • Alcohol-based hand rub (ABHR) preferred
2. Personal Protective Equipment (PPE):
   • Gloves for any contact with blood/body fluids
   • Masks, gowns, goggles as needed
3. Safe injection practices - Single use needles/syringes
4. Proper sterilization - All surgical instruments

---

II. Device-Specific Bundles:

---

III. Other Measures:

• Isolation of infectious patients (contact, droplet, airborne precautions)
• Antibiotic stewardship - Rational use of antibiotics
• Surveillance - Regular HAI monitoring and reporting
• Staff education and training
• Environmental cleaning - Especially high-touch surfaces
• Restrict visitor numbers
• Vaccination of healthcare workers (Hepatitis B, Influenza)

---

Q8. HAEMOTHORAX

Definition

Massive Haemothorax = >1500 mL of blood in pleural cavity (or >200 mL/hr drainage for 2-4 hours)

---

Causes

• Blunt chest trauma (RTA, fall)
• Penetrating trauma (stab, gunshot)
• Iatrogenic (subclavian line insertion, pleural biopsy)

• Malignancy (lung, pleural tumors)
• Aortic aneurysm rupture
• Coagulopathy
• Pulmonary infarction
• Spontaneous (anticoagulant therapy)

---

Pathophysiology

Chest injury
    ↓
Tear in intercostal vessels / lung parenchyma / great vessels
    ↓
Blood accumulates in pleural space
    ↓
Lung compression → Atelectasis → Ventilation-Perfusion mismatch
    ↓
Hypoxia + Blood loss → Hemorrhagic shock
    ↓
Clotted haemothorax → Fibrothorax (if untreated)

---

Clinical Features

Symptoms:

• Dyspnea (proportional to blood volume)
• Chest pain (pleuritic)
• Anxiety, restlessness
• Symptoms of shock (dizziness, weakness)

Signs:

Differentiate from Tension Pneumothorax: In pneumothorax, percussion is hyperresonant and trachea deviates away. In haemothorax, percussion is stony dull and JVP is low (not raised).

---

Investigations

1. Chest X-ray:
   • Opacification (white out) of affected hemithorax
   • Blunting of costophrenic angle (>200 mL)
   • Fluid level if associated pneumothorax (haemopneumothorax)
   • Mediastinal shift if massive
2. Ultrasound (FAST/EFAST) - Bedside diagnosis; detects as little as 50-100 mL
3. CT Scan Chest - Quantifies blood, identifies source, detects associated injuries (lung contusion, aortic injury)
4. Diagnostic tap - Aspirate blood (to confirm diagnosis)
5. Blood tests: CBC, coagulation profile, ABG, cross-match blood

---

Management

ATLS Principles - Immediate:

1. Airway - secure, high-flow O2
2. Two large-bore IV cannulas + blood samples
3. IV fluid resuscitation / blood transfusion

Specific Treatment:

1. Intercostal Chest Drain (ICD) - Primary Treatment

• Size: Large bore (28-32 Fr) chest tube
• Position: 5th intercostal space, anterior axillary line (or mid-axillary line)
• Insert above upper border of rib (to avoid neurovascular bundle below rib)
• Connected to underwater seal drain
• Monitor: Volume, rate of drainage, air leak

2. Indications for Surgery (Emergency Thoracotomy):

• Massive haemothorax (>1500 mL on initial drainage)
• Ongoing hemorrhage > 200 mL/hr for 2-4 consecutive hours
• Hemodynamic instability despite resuscitation
• Suspected great vessel injury
• Cardiac injury

3. Video-Assisted Thoracoscopic Surgery (VATS):

• For retained haemothorax (clotted blood not drained by ICD)
• For prevention of fibrothorax
• Best done within 5 days of injury

---

Complications

---

Q9. BLOOD TRANSFUSION IN SURGICAL PATIENTS

A. Indications for Blood Transfusion in Surgical Patients

Absolute Indications:

• Hb < 7 g/dL in asymptomatic patients
• Hb < 8 g/dL in patients with cardiovascular disease, undergoing cardiac surgery
• Hb < 10 g/dL in symptomatic patients (dyspnea, tachycardia, angina)
• Acute massive hemorrhage > 30% blood volume loss (Class III & IV shock)
• Pre-operative anemia when surgery cannot be delayed

Restrictive Transfusion Trigger (TRICC Trial evidence):

Transfuse when Hb < 7 g/dL in hemodynamically stable patients

Other Indications:

• Exchange transfusion in hemolytic disease
• Autologous transfusion (pre-donated blood)
• Bone marrow failure

---

B. Four Blood Products

Other products: Albumin, IVIG, Factor concentrates (VIII, IX for haemophilia)

---

C. Hazards / Complications of Blood Transfusion

IMMUNOLOGICAL:

1. Acute Hemolytic Reaction - ABO incompatibility → hemolysis, DIC, renal failure (most dangerous)
2. Febrile Non-Hemolytic Reaction - Most common; anti-leukocyte antibodies
3. Allergic/Anaphylactic Reaction - Urticaria to anaphylaxis
4. TRALI (Transfusion-Related Acute Lung Injury) - Acute pulmonary edema
5. TACO (Transfusion-Associated Circulatory Overload) - Pulmonary edema
6. Delayed Hemolytic Reaction - Day 5-10; anamnestic antibody response
7. Post-transfusion purpura - Thrombocytopenia 5-10 days post-transfusion
8. GvHD (Graft vs. Host Disease) - Donor lymphocytes attack recipient (irradiated blood prevents this)

NON-IMMUNOLOGICAL:

---

Q10. TOTAL PARENTERAL NUTRITION (TPN)

Definition

---

Indications (When GI Tract Cannot Be Used)

Rule: If the gut works, use it (enteral nutrition preferred over TPN)

---

Components of TPN

┌──────────────────────────────────────────────┐
│              TPN "ALL IN ONE BAG"             │
├────────────────────────────────────────────────┤
│ ENERGY SOURCES:                               │
│  • Dextrose (glucose) - 50-60% of calories   │
│  • Lipid emulsion (Intralipid) - 30-40%      │
│                                               │
│ NITROGEN SOURCE:                              │
│  • Amino acid solutions (Aminosyn, Freamine)  │
│  • ~0.2g N/kg/day (1.5-2g protein/kg/day)   │
│                                               │
│ ELECTROLYTES: Na, K, Cl, Ca, Mg, Phosphate   │
│                                               │
│ VITAMINS: Water-soluble (B, C) + Fat-soluble  │
│           (A, D, E, K)                        │
│                                               │
│ TRACE ELEMENTS: Zinc, Copper, Manganese, Se   │
│                                               │
│ FLUID: Total volume 2-3 litres/day            │
└──────────────────────────────────────────────┘

---

Route of Administration

• Central Venous Access (Central line) - preferred for long-term TPN (hypertonic solutions thrombose peripheral veins)
  • Subclavian vein, Internal jugular, PICC line
• Peripheral TPN - Only for short-term use with less concentrated solutions

---

Monitoring During TPN

---

Complications of TPN

A. Catheter-Related:

• Pneumothorax (during central line insertion)
• Hemothorax, arterial puncture
• CLABSI (Central Line-Associated Bloodstream Infection) - most common complication
• Catheter thrombosis
• Air embolism

B. Metabolic:

C. GI Complications:

• Gut atrophy - Absence of luminal nutrients → villous atrophy → bacterial translocation
• Cholestasis and liver failure (prolonged TPN)

---

Q11. LAPAROSCOPIC SURGERY - ADVANTAGES, DISADVANTAGES AND COMPLICATIONS

Definition

---

Advantages of Laparoscopic Surgery

For the Patient:

1. Small incisions (5-10 mm) → Less pain post-operatively
2. Faster recovery - Earlier return to normal activities and work
3. Shorter hospital stay - Often day-care or 1-2 day admission
4. Less blood loss intraoperatively
5. Better cosmesis - Minimal scarring (important in young patients)
6. Reduced wound complications - Less SSI, wound dehiscence, incisional hernia
7. Less post-op adhesion formation - Reduced bowel obstruction risk
8. Better visualization - Magnified view (10× magnification) improves identification of structures
9. Less post-op pulmonary complications - Earlier mobilization
10. Less immunosuppression - Minimal tissue trauma → better immune function

For the Surgeon:

• Magnified operative field
• Ability to inspect entire abdomen (diagnostic laparoscopy)
• Less fatigue (no prolonged retraction)

---

Disadvantages of Laparoscopic Surgery

1. Loss of tactile sensation (haptic feedback) - Cannot feel tissue consistency
2. 2D visualization (conventional laparoscopy) - Depth perception reduced
3. Steep learning curve - Long training period required
4. Expensive equipment - High initial setup cost, maintenance costs
5. Limited range of motion - Fixed pivot point at trocar site
6. Limited for complex cases - Massive hemorrhage, dense adhesions may need conversion
7. CO2 pneumoperitoneum effects - Physiological changes (see below)
8. Difficult to control massive bleeding laparoscopically
9. Not suitable in previous multiple surgeries (dense adhesions)
10. Trocar site hernias - Incisional hernias at port sites

---

Physiological Effects of CO2 Pneumoperitoneum

CO2 Insufflation (IAP raised to 12-15 mmHg)
├── Cardiovascular: ↓ Venous return → ↓ CO, tachycardia
├── Respiratory: Diaphragm pushed up → ↑ airway pressure
├── Renal: ↓ Renal blood flow → transient oliguria
├── CO2 absorption: Hypercarbia, acidosis
└── Position effects: Trendelenburg → ↑ ICP

---

Post-Operative Complications of Laparoscopic Surgery

Specific to Laparoscopy:

General Post-op Complications:

---

Conversion to Open Surgery - Indications

• Uncontrolled bleeding
• Dense adhesions
• Unable to identify anatomy
• Bowel or organ injury
• Equipment failure
• Anaesthetic complications

---

Common Laparoscopic Procedures in Surgery

---

Reference: SRB's Manual of Surgery (S. Rajgopal Bhat), Bailey and Love's Short Practice of Surgery 28th Edition

---

• Always start with a definition (2 marks)
• Classification with a table/diagram (2 marks)
• Clinical features clearly listed (2 marks)
• Investigations in order of preference (2 marks)
• Management logically sequenced (2 marks)
• Complications as a final table (bonus marks)