Course Content
🔬 Station 1 — Microscopic Identification of Acute Inflammation
Learning Outcomes Identify inflammatory cells on a provided microscopic slide. Identify the histopathological changes of acute appendicitis. Relate the demonstrated microscopic findings to acute inflammation.
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Microscopic Identification of Acute Inflammation
🔬 Station 2 — Microscopic Identification of Chronic and Granulomatous Inflammation
Learning Outcomes Identify the morphological changes of chronic inflammation in a provided specimen/slide. Identify the characteristic cells and their arrangement in a granuloma. Distinguish the demonstrated chronic inflammatory pattern from acute inflammation when asked.
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Microscopic Identification of Chronic and Granulomatous Inflammation
🔬 Station 3 — Identification of Granulation Tissue
Learning Outcomes Identify granulation tissue on a provided histopathology slide/image. Identify its characteristic microscopic features. Distinguish granulation tissue from granulomatous inflammation when asked.
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Identification of Granulation Tissue
🧪 Station 4 — Performance and Interpretation of Bacterial Biochemical Tests
Learning Outcomes Perform the bacterial biochemical test provided at the station using the appropriate technique. Observe and interpret the test result. Report the test as positive or negative based on the demonstrated reaction.
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Performance and Interpretation of Bacterial Biochemical Tests
🧫 Station 5 — Identification of Culture Media and Hemolysis on Blood Agar
Learning Outcomes Identify the provided microbiological culture medium. Recognize blood agar, mannitol salt agar, chocolate medium or Cary-Blair transport medium when presented. Identify the demonstrated pattern of hemolysis on blood agar.
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Identification of Culture Media and Hemolysis on Blood Agar
🚑 Station 6 — Demonstration of Gastric Lavage
Learning Outcomes Demonstrate the sequence of steps involved in gastric lavage using the provided model/manikin and equipment. Demonstrate safe handling and appropriate procedural sequence. State the essential precaution(s) relevant to the procedure when asked.
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Demonstration of Gastric Lavage
💊 Station 7 — Prescription Writing for Common Infectious Diseases Acute Tonsillitis / Malaria
Learning Outcomes Construct a complete prescription for the supplied infectious-disease scenario. Select appropriate medication with dose, route, frequency and duration. Demonstrate essential principles of safe and rational prescription writing.
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Prescription Writing for Common Infectious Diseases Acute Tonsillitis / Malaria
🦴🔍 Station 8 — Forensic Personal Identification: Bone or Hair/Fibre
Learning Outcomes Determine human sex from a provided bone or identify human hair microscopically, according to the station material. Identify the relevant distinguishing characteristics supporting the conclusion. Differentiate human hair from fibre when that specimen is provided.
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Forensic Personal Identification: Bone or Hair/Fibre
🦠 Station 9 — Laboratory Identification of Common Parasites
Learning Outcomes Identify the supplied parasite/specimen from a laboratory slide or specimen. Recognize the characteristic diagnostic form demonstrated. State the identifying feature supporting the diagnosis.
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Laboratory Identification of Common Parasites
🌍 Station 10 — Identification of Communicable Disease Models and Prevention
Learning Outcomes Identify the communicable disease represented by the provided model. Identify the important signs/features demonstrated by the model. State the major complication(s) and relevant preventive measures.
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Identification of Communicable Disease Models and Prevention
🧪🔬 AIM OSPE/OSCE Lab — Infection & Inflammation Module | 3rd Year MBBS
AIM OSCE / OSPE • MBBS

🚑 Station 6 — Demonstration of Gastric Lavage

Rapid Revision • Practical Skills • Viva

🎯 Task

CANDIDATE TASK

Using the provided manikin and equipment, demonstrate the correct sequence of gastric lavage. Maintain procedural safety throughout and state the essential precautions when asked by the examiner.

⚡ Model Station Answer

⚡ MODEL STATION ANSWER What to say in the exam

Preparation: I would first confirm that gastric lavage is specifically indicated, check for contraindications and ensure that the airway is protected.

Position: I would place the patient in the left lateral, head-down position, with suction and resuscitation equipment immediately available.

Technique: After inserting an appropriately sized lubricated gastric tube and confirming gastric placement, I would aspirate the stomach contents, then instill and withdraw measured aliquots of lavage fluid repeatedly.

Completion: I would monitor the patient throughout, stop if complications occur, remove the tube safely when lavage is complete and document the procedure.

Exam safety point: Gastric lavage is not a routine treatment for poisoning. In clinical practice it is reserved for rare selected cases and should be performed only by trained personnel with appropriate airway and resuscitation facilities.

🔎 Stepwise Procedure / Approach

Confirm indication and exclude contraindications. Review the ingested substance, timing, airway status and risk of aspiration or gastrointestinal injury.

 

  1. Prepare and protect the patient. Explain the procedure, obtain cooperation where possible, perform hand hygiene, wear appropriate PPE and ensure monitoring, suction and resuscitation equipment are ready.
  2. Position correctly. Place the patient in the left lateral decubitus position with the head lower than the torso where appropriate, to reduce aspiration risk and facilitate gastric drainage.
  3. Prepare and insert the gastric tube. Use an appropriately sized, well-lubricated gastric/orogastric tube; insert gently without force. A bite block may be used when appropriate.
  4. Confirm gastric placement before lavage. Aspirate gastric contents and confirm that the tube is in the stomach according to the local clinical protocol. Do not instill fluid if placement is uncertain.
  5. Aspirate the initial gastric contents. Collect the initial aspirate where clinically required before starting irrigation.
  6. Perform the lavage cycle. Introduce a measured aliquot of warmed isotonic lavage fluid, commonly about 200–300 mL at a time in an adult, then lower/aspirate the system to recover the fluid and gastric contents. Avoid excessive pressure or volume.
  7. Repeat while monitoring. Continue the instillation-and-drainage cycle as clinically directed while observing airway, breathing, oxygenation, pulse and the character and volume of the return.
  8. Complete safely. Stop if airway compromise, respiratory distress, bleeding or other complication occurs. When finished, remove the tube carefully if appropriate, reassess the patient and document fluid used, return obtained and patient response.

🖼️ Visual Learning

VISUAL 1

Safe Gastric Lavage — Position, Tube Placement and Lavage Cycle

🎥 Practical Video

🎥 Practical Demonstration — Gastric Lavage
Source: YouTube demonstration linked by the International Emergency Medicine Education Project

Demonstrates gastric-tube placement and the practical lavage sequence, helping you visualize the positioning, insertion and washout steps expected in a skills station.


▶ Watch Practical Video

📝 Important Viva Questions

Q1. What is gastric lavage?

It is the removal of gastric contents by passing a gastric tube and repeatedly introducing and withdrawing lavage fluid.
Q2. Is gastric lavage routinely performed in every poisoned patient?

No. It is not recommended routinely and is considered only in rare, carefully selected potentially life-threatening ingestions when the expected benefit outweighs the risk.
Q3. What is the most important airway precaution before gastric lavage?

The patient must have adequate protective airway reflexes. If the airway is compromised, lavage must not proceed without appropriate airway protection and expert management.
Q4. Name important contraindications to gastric lavage.

Important contraindications include an unprotected airway, ingestion of corrosive substances and ingestion of hydrocarbons with high aspiration potential; significant risk of gastrointestinal bleeding or perforation is also a major concern.
Q5. Why is the patient placed in the left lateral head-down position?

It helps gastric contents remain dependent in the stomach and reduces the risk of aspiration during the procedure.
Q6. What must be done before introducing lavage fluid?

The gastric tube position must be confirmed and the initial gastric contents should be aspirated. Fluid must not be introduced through a tube whose position is uncertain.
Q7. What are important complications of gastric lavage?

Important complications include aspiration pneumonitis, hypoxia or laryngospasm, tube misplacement, esophageal or gastric injury, bleeding and fluid or electrolyte disturbances.
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