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OG19.3,OG35.{15-18,20},OG36.3 | Core Procedural Skills — Practice Quiz
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When performing a conventional Pap smear (Ayre's spatula), which anatomical landmark must be sampled to ensure an adequate specimen?
Correct. The transformation zone at the squamocolumnar junction is where the majority of cervical intraepithelial neoplasia arises, and the Ayre's spatula must engage this zone. A smear with no TZ component is technically unsatisfactory.
The transformation zone is the primary target of Pap smear sampling. The Bethesda System 2014 mandates an assessment of TZ component adequacy on every report.
The Pap smear is specifically designed to sample the transformation zone at the squamocolumnar junction — the region where squamous metaplasia occurs and CIN develops. Sampling the fornix, ectocervix alone, or endocervical canal above the os will miss the critical zone.
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A Pap smear report is labelled 'Unsatisfactory for evaluation.' Which of the following is the most common reason for this classification?
Correct. Per the Bethesda System 2014, a smear is unsatisfactory when >75% of cells are obscured by blood, inflammation, or other factors. The specimen cannot be evaluated for abnormality.
Bethesda System 2014: unsatisfactory = >75% obscured, or insufficient squamous cells. A partially obscured smear with >75% cells visible is 'satisfactory but limited by...' — not unsatisfactory.
Endocervical cells are desirable (confirm TZ sampling); patient age and instrument choice do not define unsatisfactory status. Obscuring factors (blood, inflammation, thick smear) covering >75% of cells render the specimen unsatisfactory under the Bethesda System.
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During colposcopy-directed cervical punch biopsy, from which site should the biopsy be taken to maximise diagnostic yield?
Correct. The acetowhite or Schiller's iodine-negative area within the TZ represents the area of highest-grade abnormality. Punch biopsy must be directed by colposcopic findings to avoid sampling error.
Cervical punch biopsy is a colposcopy-directed procedure. Random biopsy without colposcopic guidance increases the risk of sampling error and missing high-grade CIN.
Punch biopsy must be colposcopically directed. Normal columnar epithelium, random quadrant sampling, and fixed anatomical sites do not target the abnormal tissue. The highest-grade lesion is identified by the densest acetowhitening or iodine-negativity.
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A primigravida at 38 weeks is being considered for ARM to augment slow progress in active labour. Which of the following is an ABSOLUTE contraindication to performing ARM?
Correct. A high floating head (not engaged — 3/5 palpable corresponds to station -2 or higher) is a contraindication to ARM because of the risk of cord prolapse. The presenting part must be engaged (2/5 or less palpable abdominally) before ARM.
The critical prerequisite for ARM is engagement of the presenting part. A floating head (>2/5 palpable) makes cord prolapse likely when membranes are ruptured artificially.
ARM requires an engaged presenting part to prevent cord prolapse. A head that is 3/5 palpable abdominally has not engaged into the pelvic brim — ARM in this situation risks umbilical cord prolapse, which is an obstetric emergency. Bishop score, cervical dilatation, and mild oligohydramnios are not absolute contraindications.
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A mediolateral episiotomy is made at 45 degrees from the midline during crowning. When suturing, the first layer to be closed is:
Correct. Episiotomy repair proceeds in layers from deep to superficial. The vaginal mucosa is repaired first, starting from the apex — which must be identified and secured to prevent a haematoma in the unrepaired dead space above.
Always start episiotomy repair at the apex of the vaginal mucosal incision, not the introitus. Missing the apex creates dead space above the repair — the site of haematoma formation.
Episiotomy repair is anatomical layer-by-layer: vaginal mucosa first (apex upward), then deep perineal muscles, superficial perineal muscles, and finally skin. Starting with skin or muscles leaves the vaginal space unsecured. Anal sphincter repair (if torn) precedes all other layers in a 3rd/4th degree tear.
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Which suture material is recommended for routine episiotomy repair in current obstetric practice?
Correct. Polyglactin 910 (Vicryl) is the preferred absorbable braided suture for episiotomy repair, offering good tensile strength for 3–4 weeks and minimal tissue reactivity compared to chromic catgut.
Polyglactin 910 (Vicryl 2-0 or 3-0) is the standard for episiotomy repair. Chromic catgut has higher inflammation rates; non-absorbable sutures require removal and increase pain.
Non-absorbable sutures (Prolene, silk) require removal and cause patient discomfort. Chromic catgut is associated with more tissue inflammation and faster absorption than polyglactin. Polyglactin 910 (Vicryl) is the evidence-based choice for episiotomy repair.
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During female urinary catheterisation in the immediate postpartum period, difficulty identifying the urethral meatus is encountered. What is the most common anatomical reason?
Correct. Postpartum perineal oedema and haematoma can distort the normal anatomical landmarks and displace the urethral meatus, making identification difficult. Adequate lighting, patient positioning, and gentle labial retraction are required.
Postpartum catheterisation requires extra care because perineal oedema and haematoma obscure the urethral meatus. Use good lighting and gentle labial retraction before attempting passage.
The postpartum perineum undergoes significant soft-tissue oedema and may develop haematoma following instrumental delivery or episiotomy. This distorts the urethral meatus position. Congenital stenosis does not develop acutely; bladder descent and anterior vaginal wall displacement are not the primary mechanism.
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A 28-year-old woman with three children requests a CuT 380A IUCD. During insertion, the uterine sound measures 5.5 cm. What is the correct action?
Correct. CuT 380A requires a minimum uterine cavity depth of 6 cm. A cavity measuring 5.5 cm is too small — forced insertion risks perforation. Alternative contraception should be discussed.
Always sound the uterus before IUCD insertion. Minimum uterine length for CuT 380A is 6 cm. A cavity under 6 cm mandates aborting insertion to prevent perforation.
CuT 380A has a minimum cavity depth requirement of 6 cm. Forcing insertion into a smaller cavity dramatically increases the risk of uterine perforation. Partial insertion or ignoring the measurement are unsafe. The correct action is to abort insertion and counsel on alternatives.
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A patient presents 3 weeks after CuT 380A insertion with lower abdominal pain, fever (38.2°C), and purulent cervical discharge. IUCD strings are visible. What is the immediate management?
Correct. WHO guidelines recommend starting broad-spectrum antibiotics first in IUCD-associated PID. The IUCD is removed only if there is no clinical improvement within 48–72 hours. Premature removal without antibiotic cover may worsen ascending infection.
In IUCD-associated PID, start antibiotics first. Remove the IUCD only if symptoms do not improve within 72 hours of adequate antibiotic therapy — this balances infection control with avoiding premature removal.
Immediate IUCD removal without antibiotic cover can permit ascending spread. Retaining the device without addressing the infection allows progression to tubo-ovarian abscess. WHO recommends antibiotics first, with IUCD removal if no improvement within 72 hours.
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During a minilaparotomy for tubal ligation using the modified Pomeroy technique, the surgeon excises a loop of tissue. The specimen is sent for histology. Which finding would confirm that the correct structure was ligated?
Correct. The fallopian tube lumen is lined by ciliated columnar (tubal) epithelium with interspersed secretory cells. Histological identification of this epithelium confirms the excised loop is fallopian tube, not round ligament.
The modified Pomeroy technique provides an excised loop for histological confirmation — the fallopian tube is identified by its ciliated columnar epithelium. The round ligament has no epithelial lumen and is the classic wrong-structure error in minilaparotomy tubal ligation.
The round ligament — a common wrong-structure confusion — is composed of smooth muscle and fibrous tissue without an epithelial lumen. The fallopian tube is uniquely identified by its ciliated columnar epithelium-lined lumen. Histological confirmation with the modified Pomeroy specimen is the key safety check.
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