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SU14.1-4,SU15.1,SU16.1 | Basic Surgical Skills, Biohazard Disposal and MIS — Practice Quiz
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A theatre technician is reprocessing a load of stainless-steel instruments in a downward-displacement autoclave. Which combination of temperature, pressure and holding time represents the standard moist-heat sterilization cycle for such instruments?
Correct. Saturated steam at 121 °C, 15 psi (about 1 atmosphere above ambient) held for 15 minutes is the classic downward-displacement autoclave cycle and reliably kills vegetative organisms and resistant bacterial spores.
Moist heat sterilizes by denaturing protein; the standard autoclave cycle is 121 °C / 15 psi / 15 min. Higher-temperature cycles (134 °C) require correspondingly shorter holding times.
The classic autoclave cycle is 121 °C at 15 psi for 15 minutes. 100 °C is boiling (disinfection, not sterilization), 160 °C is a dry-heat oven setting, and 134 °C cycles run for only ~3 minutes, not 60.
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Using the Spaulding classification, a flexible gastrointestinal endoscope that contacts intact mucous membranes but does not enter sterile tissue is classified as which category, and what minimum level of reprocessing does it require?
Correct. Items contacting mucous membranes or non-intact skin are semi-critical and require at least high-level disinfection.
Spaulding classification: critical → sterilize; semi-critical → high-level disinfection; non-critical → low-level disinfection. Match the reprocessing level to the contact risk of the item.
Spaulding classes items by contact risk: critical (enter sterile tissue/vasculature) need sterilization; semi-critical (contact mucosa/non-intact skin) need high-level disinfection — an endoscope is semi-critical; non-critical (intact skin) need low-level disinfection.
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After an autoclave cycle, the external chemical indicator tape on a surgical pack has changed colour. A trainee concludes the instruments inside are sterile. What does this external colour change actually confirm?
Correct. External (process) indicator tape distinguishes processed from unprocessed packs only. Sterility of the contents is confirmed by the internal chemical integrator and, periodically, the biological indicator.
Three monitors: mechanical (gauges), chemical (external process tape + internal integrator), biological (spore test, the gold standard). External tape never proves the load is sterile.
External autoclave tape is a Class 1 process indicator: it shows the pack went through a sterilizer, nothing more. Confirm sterility from the internal chemical integrator and the biological indicator (spore test).
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A surgeon is closing a clean facial laceration and wants a suture that minimises tissue drag and bacterial harbouring while providing the smoothest passage. Which physical property of suture material best meets this requirement?
Correct. Monofilament sutures have a single smooth strand, so they cause less tissue drag and resist bacterial colonisation in their interstices — ideal for a contaminated or cosmetically important wound.
Keep the two suture classifications separate. Monofilament = smooth, low drag, less bacterial harbouring; braided = better handling/knot security but wicks bacteria. Absorbable vs non-absorbable is a separate axis.
Two independent classifications exist: absorbable vs non-absorbable (what happens over time) and monofilament vs braided (physical structure). Smoothness and resistance to bacterial harbouring are structural properties — a monofilament strand is the answer.
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When planning an elective incision over the skin of the forearm, a surgeon orients it to minimise wound tension and produce the finest scar. According to which principle should the incision be placed?
Correct. An elective incision placed parallel to Langer's lines (the lines of least skin tension) gaps least and heals with the finest scar.
Place elective incisions parallel to Langer's lines for least tension and finest scar, while still giving adequate surgical access.
Langer's lines are the lines of least skin tension. An elective incision parallel to them minimises wound gape and gives the best cosmetic scar; cutting across (perpendicular to) them widens the scar.
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Under the Indian Bio-Medical Waste Management Rules 2016 colour-coding system, into which coloured container should a used disposable scalpel blade and other sharps be discarded?
Correct. Sharps — needles, blades, scalpels — go into the white translucent, rigid, puncture-proof container under the BMW Rules 2016.
BMW 2016 colour coding: Yellow (incinerable infectious/anatomical), Red (contaminated recyclable plastic), White (sharps, puncture-proof), Blue (glass/metal). Sharps → white, never recapped.
BMW 2016 colours: yellow = anatomical/soiled/infectious waste (incineration); red = contaminated recyclable plastics (tubing, catheters); white = sharps (puncture-proof); blue = broken/discarded glass and metallic implants. Sharps are white.
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A nurse has just given an intramuscular injection. Which practice most directly reduces the risk of a needle-stick injury during disposal?
Correct. Needles should be discarded uncapped, directly into the rigid puncture-proof sharps container at the point of use. Recapping is the single commonest cause of needle-stick injury.
Never recap needles. Discard uncapped sharps directly into the white puncture-proof container at the point of use — recapping causes most needle-stick injuries.
Recapping (especially two-handed) is the commonest cause of needle-stick injury and must be avoided. The safe practice is to drop the uncapped needle straight into the sharps container at the point of use.
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During laparoscopic surgery the abdominal cavity is insufflated to create a working space (pneumoperitoneum). Which gas is used for insufflation, and why is it preferred?
Correct. CO2 is used because it is non-combustible (safe with diathermy), highly soluble and rapidly absorbed then excreted by the lungs, limiting the risk of a dangerous gas embolism.
Laparoscopy uses CO2 for pneumoperitoneum: non-combustible and rapidly absorbed/excreted. Advantages of MIS include less pain, smaller scars, shorter stay; disadvantages include cost, learning curve and limited tactile feedback.
Pneumoperitoneum is created with carbon dioxide: it is non-combustible (unlike oxygen/nitrous oxide near diathermy) and highly soluble, so it is rapidly absorbed and exhaled, reducing embolism risk. Room air is not used.
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