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SRB Manual of Surgery BDS 3rd year topics wound healing shock thyroid

I have enough to give a thorough, well-organized answer. Here is a complete study guide for BDS 3rd year General Surgery PYQs, mapped to SRB's Manual of Surgery and S Das's Manual on Clinical Surgery.

BDS 3rd Year - General Surgery PYQ Study Guide

Based on SRB's Manual of Surgery & S Das's Manual on Clinical Surgery (2018-2026)

FREQUENCY ANALYSIS - MUST KNOW TOPICS

Topic	Long Essay Count	Short Essay Count
Shock (Septic/Hypovolemic/Hemorrhagic)	6	-
Thyroid (Solitary nodule/Goiter/Graves'/MNG)	6	2
Wound healing & wounds	4	2
Cleft lip & palate	3	3
Parotid tumors (Pleomorphic adenoma/Warthin's)	3	2
Gas gangrene	2	2
Ludwig's angina	-	4
Tracheostomy	-	3
Tuberculous lymphadenitis	-	3
Trigeminal neuralgia	-	3

SECTION I - LONG ESSAYS (10 Marks)

1. SHOCK (Most repeated topic - 6 times)

Definition (SRB): Shock is a state of acute circulatory failure with inadequate tissue perfusion resulting in cellular hypoxia.

Classification:

Hypovolemic - hemorrhage, burns, dehydration
Cardiogenic - MI, tamponade, arrhythmia
Distributive - Septic, anaphylactic, neurogenic
Obstructive - PE, tension pneumothorax

SEPTIC SHOCK (most asked subtype)

Etiology:

Gram-negative organisms most common: E. coli, Klebsiella, Pseudomonas
Gram-positive: Staphylococcus, Streptococcus
Sources: urinary tract, biliary, abdominal, respiratory

Pathophysiology (SRB):

Endotoxin (LPS from gram-negative) or exotoxin release
Activation of macrophages → release of TNF-alpha, IL-1, IL-6
Activation of complement, coagulation cascade
Nitric oxide synthase activation → massive vasodilation
Capillary leak syndrome → decreased preload
Myocardial depression
Hypotension, tachycardia, warm extremities (early/warm shock)
Multi-organ dysfunction → MODS

SIRS Criteria (2 or more):

Temperature >38°C or <36°C
Heart rate >90/min
Respiratory rate >20/min or PaCO₂ <32 mmHg
WBC >12,000 or <4,000 or >10% bands

Clinical Features:

Early/Warm shock: fever, flushed skin, bounding pulse, hypotension
Late/Cold shock: cold clammy skin, oliguria, altered sensorium, MODS

Management (SRB - 3 priorities):

Resuscitation:

Oxygen - high flow
IV access - two large bore cannulae
IV fluids - crystalloids (Normal saline/Ringer's lactate) - 30 mL/kg bolus
Target MAP >65 mmHg

Vasopressors (if fluids fail):

Norepinephrine - drug of choice (first line)
Vasopressin - added second
Dopamine - alternative

Source control:

Blood cultures before antibiotics
Broad spectrum IV antibiotics within 1 hour (Piperacillin-tazobactam + aminoglycoside)
Surgical drainage of source

Supportive:

ICU admission, monitoring CVP, urine output
Hydrocortisone 200 mg/day if refractory shock
Tight glycaemic control
DVT prophylaxis

HYPOVOLEMIC SHOCK:

4 classes based on blood loss (Class I-IV per SRB/ATLS)
Class I: <750 mL, Class II: 750-1500, Class III: 1500-2000, Class IV: >2000 mL
Management: stop bleeding, IV fluids (3:1 rule), blood transfusion (Class III/IV)

2. SOLITARY THYROID NODULE (4 times)

Definition: A single palpable nodule in an otherwise normal thyroid gland.

Etiology:

Benign (80%): Colloid cyst, follicular adenoma, Hashimoto's thyroiditis
Malignant (20%): Papillary carcinoma (most common), Follicular, Medullary, Anaplastic

"Malignant features" to identify (SRB mnemonic):

Hard, fixed, irregular nodule
Rapid growth
Age <20 or >70 years
Male sex
Hoarseness (RLN involvement)
Cervical lymphadenopathy
Previous radiation to neck

Investigations:

FNAC (Fine Needle Aspiration Cytology) - gold standard first investigation
Thyroid function tests (T3, T4, TSH)
USG thyroid (TIRADS grading)
Radioisotope scan - hot vs cold nodule (cold = higher malignancy risk)
Chest X-ray, laryngoscopy

Treatment:

Benign adenoma: hemithyroidectomy (isthmectomy + ipsilateral lobe)
Malignant: total thyroidectomy + neck dissection if lymph nodes involved
Follow-up: TSH suppression with thyroxine; radioiodine for papillary/follicular

3. WOUND HEALING (4 times)

Phases of wound healing (SRB):

Phase 1 - Inflammatory (Days 0-5):

Haemostasis: platelet plug, fibrin clot
Vasodilation, increased permeability
Neutrophils (Day 1-2): debridement
Macrophages (Day 2-5): key orchestrators, release growth factors (PDGF, FGF, EGF)

Phase 2 - Proliferative (Days 5-21):

Fibroblasts proliferate and migrate
Collagen synthesis (Type III initially, then Type I)
Angiogenesis (new blood vessel formation)
Granulation tissue formation
Epithelialisation

Phase 3 - Remodelling/Maturation (Day 21 to 1-2 years):

Type III collagen replaced by Type I
Scar matures, contracts
Tensile strength increases (maximum ~80% at 3 months)
Myofibroblast-driven wound contraction

Factors affecting wound healing:

Local factors:

Infection (most common cause of delayed healing)
Poor blood supply
Radiation damage
Foreign body
Dead space, wound tension

Systemic factors:

Diabetes mellitus
Malnutrition (Vitamin C, zinc deficiency)
Steroids and immunosuppressants
Jaundice, anaemia
Old age

Types of healing:

Primary (1st intention): clean incised wound, edges apposed
Secondary (2nd intention): contaminated/infected wound, heals by granulation
Tertiary (delayed primary/3rd intention): wound left open, closed after 4-5 days

4. GOITER AND TOXIC MNG (4 times)

Definition of Goiter: Any enlargement of the thyroid gland.

Classification (SRB):

Physiological: puberty, pregnancy, lactation

Pathological:

Simple (non-toxic): diffuse, MNG
Toxic: Graves' disease, toxic adenoma, toxic MNG
Inflammatory: Hashimoto's, De Quervain's
Neoplastic: benign (adenoma), malignant

Multinodular Goiter (MNG):

Multiple nodules of varying sizes
Most common thyroid disorder in iodine-deficient areas

Pathogenesis: Iodine deficiency → TSH rise → diffuse hyperplasia → focal hyperplasia → nodule formation → MNG

Clinical features:

Neck swelling moving with swallowing
Pressure symptoms: dyspnea, dysphagia, stridor
Retrosternal extension: Pemberton's sign (facial congestion on raising arms)
Hoarseness if malignant transformation

Toxic MNG (Plummer's disease):

MNG with hyperthyroidism
Usually elderly patients
T3 toxicosis common
No eye signs (unlike Graves')
Treatment: Radioiodine (preferred) or subtotal thyroidectomy

Graves' Disease:

Autoimmune: TSH receptor antibodies (TRAb)
Classic triad: goiter + exophthalmos + pretibial myxedema
Eye signs: lid lag (Von Graefe's), lid retraction (Dalrymple's), exophthalmos, ophthalmoplegia
Treatment: Antithyroid drugs (Carbimazole/PTU) → Block and replace; then radioiodine or surgery

5. CLEFT LIP AND PALATE (3 times)

Development of face (important for the essay):

Face develops from 5 facial processes:
- Frontonasal process (1)
- Maxillary processes (2)
- Mandibular processes (2)
Fusion failure → cleft

Cleft Lip:

Failure of fusion of medial nasal process with maxillary process
CL is UNILATERAL (left > right) or bilateral
Classification: incomplete (partial) / complete (through floor of nose)

Clinical features:

Cosmetic deformity
Feeding difficulty (poor suction)
Speech problems
Associated cleft palate (in ~50%)

Management (SRB rule of 10s - Millard's criteria):

Age: 10 weeks
Weight: 10 pounds (4.5 kg)
Hb: 10 g/dL
Technique: Millard's rotation-advancement flap (most common)

Cleft Palate:

Failure of fusion of palatal shelves
Types: Veau classification I-IV
Leads to: nasal regurgitation, speech problems (hypernasal), recurrent otitis media, dental problems

Management:

Surgery at 18 months (before speech development)
Technique: Veau-Wardill-Kilner (V-Y pushback) or Furlow double-opposing Z-plasty
Pre-op: feeding plate (obturator), speech therapy post-op

6. PAROTID TUMORS (3 times)

Classification:

Benign (80%):

Pleomorphic adenoma (mixed parotid tumor) - 70% of all parotid tumors
Warthin's tumor (cystadenolymphoma)
Oncocytoma

Malignant (20%):

Mucoepidermoid carcinoma (most common malignant)
Adenoid cystic carcinoma
Acinic cell carcinoma
Carcinoma ex-pleomorphic adenoma

Pleomorphic Adenoma (Mixed Parotid Tumor):

Most common salivary gland tumor
Location: superficial lobe of parotid, below earlobe
Capsule is incomplete - pseudocapsule
Contains epithelial cells + myoepithelial cells + mesenchymal stroma

Clinical features:

Painless, slow-growing swelling in parotid region
Firm, lobulated, mobile
No facial nerve palsy (benign)
Bimanual palpation - mobile
Risk of malignant transformation (~5% → carcinoma ex-pleomorphic)

Investigations: FNAC, USG, CT/MRI

Treatment: Superficial parotidectomy (with facial nerve preservation)

Not enucleation (high recurrence due to satellite nodules)

Warthin's Tumor (Cystadenolymphoma):

2nd most common benign parotid tumor
Bilateral in 10%, multicentric
Smooth, fluctuant, soft swelling
Exclusively in parotid (not other salivary glands)
Hot on technetium scan (due to oncocytic cells)
Histology: papillary epithelium with lymphoid stroma
Treatment: superficial parotidectomy

Frey's Syndrome:

Complication of parotidectomy
Auriculotemporal nerve (parasympathetic) aberrantly reinnervates sweat glands
Result: gustatory sweating (sweating while eating)
Treatment: Botulinum toxin injection

7. GAS GANGRENE (2 times)

Causative organisms:

Clostridium perfringens (most common, 80%)
Also: C. novyi, C. septicum, C. histolyticum

Pathogenesis:

Anaerobic wound → spore germination → exotoxin release
Alpha toxin (lecithinase) - most important → destroys cell membranes
Gas produced from carbohydrate fermentation → crepitus

Clinical features:

Incubation: 1-5 days
Wound: bronze-brown discoloration, serous/serosanguinous discharge, sweet/foul smell
Crepitus (pathognomonic) - crackling on palpation
Rapid spreading edema
Systemic: high fever, tachycardia, jaundice, hemolytic anemia
X-ray: gas in tissues (feathery pattern)

Management:

Radical debridement - wide excision of all necrotic tissue
Hyperbaric oxygen - inhibits anaerobic growth (3 atm, 3 sessions/day)
Penicillin G IV (drug of choice) + metronidazole
Polyvalent antitoxin (controversial)
Amputation if limb involved
ICU support

8. TETANUS

Organism: Clostridium tetani - gram positive, obligate anaerobe, drum stick appearance

Toxin: Tetanospasmin - blocks inhibitory neurotransmitters (GABA, glycine) at Renshaw cells → spasticity

Clinical features:

Incubation: 4-21 days (average 10 days)
Trismus (lockjaw) - first symptom
Risus sardonicus (sardonic grin)
Opisthotonus (arched back)
Board-like abdomen
Reflex spasms triggered by stimuli
Autonomic instability

Management (SRB):

Wound debridement
Human tetanus immunoglobulin (HTIG) 3000-6000 IU IM - neutralizes unbound toxin
Tetanus toxoid (active immunization in different limb)
IV Metronidazole (drug of choice) or Penicillin G
Diazepam (muscle relaxant - first line)
ICU - ventilator support, dark/quiet room, minimal stimulation

SECTION II - SHORT ESSAYS (5 Marks)

Ludwig's Angina (appeared 4 times)

Bilateral cellulitis of submandibular, sublingual, submental spaces
Organisms: mixed oral flora, Streptococci, Staphylococci, anaerobes
Source: most commonly 2nd/3rd molar tooth infection (85%)
Clinical: "woody hard" brawny induration, no pus formation (hallmark), tongue elevated, floor of mouth indurated, dysphagia, drooling, respiratory distress
Treatment: Airway (tracheostomy/awake intubation if threatened), IV antibiotics (Pen G + Metronidazole + aminoglycoside), surgical drainage through submandibular incision

Tuberculous Lymphadenitis (3 times)

Most common form of peripheral TB
Cervical LN (posterior triangle) most commonly involved
Stages (SRB): (1) Lymphadenitis → (2) Periadenitis → (3) Central caseation → (4) Collar stud abscess (cold abscess) → (5) Skin involvement (acute abscess) → (6) Sinus formation
Diagnosis: FNAC (most common), ZN staining for AFB, culture, Mantoux, CXR
Treatment: HRZE × 2 months → HR × 4 months (RNTCP)

Trigeminal Neuralgia (3 times)

Paroxysmal, severe, stabbing pain along trigeminal nerve distribution
V2 + V3 most common, rarely V1
Unilateral, brief attacks (seconds to 2 minutes)
Trigger zones: corner of mouth, upper lip, cheek
"Trigger factors:" eating, talking, cold wind, tooth brushing
Treatment: Carbamazepine (drug of choice), Phenytoin, Baclofen; Surgical: microvascular decompression (MVD - Jannetta's procedure), radiofrequency rhizotomy, alcohol nerve block

Tracheostomy (3 times)

Indications:

Upper airway obstruction (laryngeal trauma/tumor/foreign body)
Prolonged ventilatory support
Bronchopulmonary toilet
Prophylactic (major head & neck surgery)

Types: Temporary, permanent; high/mid/low

Complications:

Immediate: hemorrhage, air embolism, apnea
Early: tube displacement, subcutaneous emphysema, pneumothorax, infection
Late: tracheal stenosis, tracheomalacia, tracheo-cutaneous fistula, dysphagia

Le Fort Fractures

Le Fort I: Horizontal fracture through maxilla - separates teeth + hard palate from rest
Le Fort II: Pyramidal fracture through nasal bones, orbital floor, maxilla (classic: mobile maxilla, anesthesia over cheek)
Le Fort III: Craniofacial disjunction - entire face separated from skull base; through ZF suture, orbital walls, nasal bone

Dry vs Wet Gangrene

Feature	Dry	Wet
Cause	Ischemia (arteriosclerosis)	Infection + ischemia
Organisms	None	Present
Color	Black/shriveled, mummified	Green/black, foul smell
Spread	Slow, localized	Rapid, spreading
Toxemia	Absent	Severe
Line of demarcation	Present	Absent
Treatment	Conservative → amputation	Emergency amputation + antibiotics

Cellulitis

Spreading infection of dermis and subcutaneous tissue
Organism: Streptococcus pyogenes (Group A Strep) most common
Features: ill-defined erythema, edema, warmth, pain - NO pus
Treatment: IV Benzylpenicillin / Amoxicillin; elevation and rest; mark the edge

Carbuncle

Multiple interconnected furuncles (boils)
Common site: nape of neck, back
Organism: Staphylococcus aureus
Associated with diabetes mellitus
Treatment: Wide excision/cruciate incision, antibiotics (Cloxacillin), control diabetes

SECTION III - SHORT ANSWERS (2 Marks)

Topic	Key Answer Points
Collar stud abscess	TB cold abscess that tracks through deep fascia forming dumbbell/collar stud shape; fluctuation in both upper and lower compartments; treat by draining both
SIRS definition	2 or more: temp >38°C/<36°C, HR>90, RR>20/PaCO₂<32, WBC >12,000/<4,000
Reed-Sternberg cell	Binucleated giant cell with prominent "owl-eye" nucleoli; pathognomonic of Hodgkin's lymphoma
Virchow's triad	3 factors predisposing to thrombosis: (1) Endothelial injury, (2) Stasis of blood flow, (3) Hypercoagulability
Virchow's node	Left supraclavicular lymphadenopathy; sentinel node of GI malignancy (stomach/pancreatic cancer)
Thyroglossal cyst	Midline neck cyst arising from persistent thyroglossal duct; moves with swallowing AND protrusion of tongue; treatment: Sistrunk's operation
Branchial cyst	Remnant of 2nd branchial cleft; anterior border of SCM, level II/III; contains cholesterol crystals; lined by stratified squamous epithelium
Ranula	Retention cyst of sublingual salivary gland; bluish translucent swelling in floor of mouth; "plunging ranula" extends below mylohyoid
Keloid vs Hypertrophic scar	Keloid: grows beyond wound margins, does not regress, no time limit; Hypertrophic: within wound margins, regresses within 18 months
Bell's palsy	LMN facial nerve palsy; unable to close eye + forehead involved (unlike UMN); treatment: prednisolone + antivirals (acyclovir)
Hilton's method	Technique of opening abscess with artery forceps rather than incision to avoid cutting adjacent nerves/vessels
Thiersch grafting	Split skin graft (SSG): epidermis + part of dermis; donor site heals spontaneously; used for large wounds
Absorbable sutures	Catgut (plain + chromic), Vicryl (polyglactin), Dexon (polyglycolic acid), PDS (polydioxanone), Monocryl
Cancrum oris (Noma)	Gangrenous stomatitis in malnourished children; starts as ulcer in mouth; rapid tissue destruction; Fusospirochetal organisms; high mortality
Lucid interval	Period of consciousness between initial LOC and secondary LOC in extradural hematoma due to middle meningeal artery bleeding
Autoclave	Steam under pressure sterilization; 121°C at 15 psi for 15 min (porous load: 134°C/3 min); gold standard for surgical instruments
Leukoplakia	White patch on oral mucosa that cannot be scraped off; premalignant; >5 mm; biopsy if not responding to treatment; associated with tobacco/alcohol
Erythroplakia	Red velvety patch on oral mucosa; higher malignant potential than leukoplakia (~90% dysplastic)
Frey's syndrome	Gustatory sweating after parotidectomy; auriculotemporal nerve (parasympathetic) regenerates into sweat glands; treat with Botox
Macroglossia causes	Lymphangioma, hemangioma, cretinism (congenital hypothyroidism), Down's syndrome, amyloidosis, acromegaly, Beckwith-Wiedemann syndrome
Trismus causes	Tetanus, pericoronitis, TMJ ankylosis, masseteric space abscess, carcinoma cheek, drug-induced (phenothiazines)
Post-exposure prophylaxis HIV	2 NRTIs + 1 PI within 72 hours, for 28 days; zidovudine + lamivudine + lopinavir/ritonavir

HIGH-YIELD EXAM TIPS (SRB + S Das)

Most repeated essay: Septic shock - know SIRS criteria, norepinephrine as DOC, source control, "Surviving Sepsis Campaign" bundle
FNAC is gold standard first test for any neck/thyroid swelling - examiner loves this
Rule of 10s for cleft lip surgery timing is always asked
Pleomorphic adenoma = pseudocapsule = superficial parotidectomy (never enucleation)
Tetanus - Metronidazole (drug of choice, NOT penicillin in many current texts); Diazepam for spasms
Gas gangrene - Hyperbaric O₂ is important to mention
Tuberculosis - collar stud abscess, stages of TB lymphadenitis - very BDS-specific
Le Fort fractures - draw a diagram if possible; very commonly asked in 2-marker section
Virchow's triad and Virchow's node are different - know both
For wound healing essays: always divide into phases, list ALL factors affecting healing

References: SRB's Manual of Surgery (8th Edition, Sriram Bhat M) | S Das's Manual on Clinical Surgery (13th Edition) | Bailey & Love's Short Practice of Surgery (28th Edition)

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