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SU15.1,SU16.1 | Hospital Waste Disposal and Minimally Invasive Surgery — SDL Guide (Part 3)
Check Your Understanding
Consolidate both halves of the module by walking each from principle to practice. For biomedical waste, fix the principle first — segregate at source, label and use the biohazard symbol, never recap needles — then map the four colours: yellow for anatomical/soiled/expired-drug/chemical/lab waste (incinerated or deep-buried); red for contaminated recyclable plastics (autoclaved then recycled); white puncture-proof for sharps (autoclaved/dry-heat then shredded/encapsulated); blue for broken glass and metallic implants (disinfected then recycled). For minimally invasive surgery, recall that it operates through small ports with a camera and long instruments, made possible by a CO2 pneumoperitoneum (inert, non-combustible, highly soluble, ~12–15 mmHg); state its indications (diagnostic laparoscopy; cholecystectomy, appendicectomy, hernia repair and more); its advantages (less pain, smaller scars, less infection, fewer adhesions, shorter stay, faster recovery); and its disadvantages (cost, learning curve, longer early operative time, loss of tactile feedback, CO2-related physiological effects, access injury, and the option of conversion to open). Self-test on four links: can you assign any item to its waste colour and state its treatment; can you explain why CO2 is the insufflating gas; can you list the advantages and disadvantages of MIS; and can you say when MIS is unsuitable or should be converted? The questions below check exactly these.
SELF-CHECK
Carbon dioxide is the gas used to create the pneumoperitoneum in laparoscopic surgery. Which property is the MAIN reason it is preferred?
A. It is heavier than air and so settles in the pelvis
B. It is inert, non-combustible and highly soluble in blood, so any absorbed gas is rapidly cleared by the lungs
C. It increases blood pressure, improving organ perfusion during surgery
D. It is flammable, which improves diathermy performance
Reveal Answer
Answer: B. It is inert, non-combustible and highly soluble in blood, so any absorbed gas is rapidly cleared by the lungs
CO2 is chosen because it is inert and non-combustible (safe near diathermy) and highly soluble in blood, so gas that is absorbed — or that accidentally enters a vessel — is rapidly carried to the lungs and exhaled, reducing the danger of gas embolism. It does not raise blood pressure (raised intra-abdominal pressure actually reduces venous return), and it is the opposite of flammable.