Procedure preparation and anesthesia selection
Culdocentesis is performed exclusively in a minor operating room. The patient is placed on a standard gynecological examination table in the supine position. To ensure adequate access, the legs must be flexed at the hip and knee joints.
Before starting the manipulation, the physician selects the optimal method of anesthesia. Local infiltration anesthesia is permitted, using a 0.25% procaine solution. Alternatively, especially when deeper patient relaxation is required, intravenous anesthesia (short-term general anesthesia) is used.
Classic execution algorithm (without vaginal specula during the puncture stage)
This technique involves removing the specula immediately before the puncture itself. The step-by-step algorithm includes the following stages:
- Thorough disinfection of the external genitalia and vaginal mucosa with an antiseptic solution.
- Exposure of the vaginal portion of the cervix using vaginal specula.
- Grasping and secure fixation of the posterior lip of the cervix with bullet forceps.
- Removal of the specula from the vagina. The physician performs traction (pulling) of the cervix anteriorly, strictly in the direction of the pubic symphysis.
- A 10–12 cm long needle tightly attached to a dry 5–10 ml syringe is used for the puncture.
- The puncture is performed strictly along the midline, slightly posterior to the boundary between the cervix and the fornix. The puncture site is determined by palpation: the physician searches for an area of fluctuation, induration, bulging, or characteristic "pasty" consistency.
- The needle is advanced 2–3 cm into the tissues. The direction of movement is strictly parallel to the posterior surface of the uterus (the pelvic axis).
- Aspiration of the contents of the punctured space is performed by slowly pulling the syringe plunger back.
Alternative technique (using specula)
In certain clinical situations, a modified technique is used where the specula remain in the vagina throughout the procedure:
- The vagina is opened with specula.
- A long retractor is inserted under the posterior lip of the cervix. It is used to gently push the tissues upward and anteriorly.
- A spoon-shaped speculum is placed in the posterior fornix to improve visualization of the surgical field.
- The needle puncture is performed strictly along the midline, in the space between the uterosacral ligaments. The direction of needle advancement is parallel to the cervix.
Evaluation of the punctate and management in case of a negative result
The material obtained during aspiration is subject to immediate visual assessment. The physician analyzes the nature of the fluid, its color, and its degree of transparency.
If dark blood appears in the syringe or a small blood clot forms, this serves as a reliable criterion for the presence of spilled blood in the abdominal cavity.
It is important to remember: the absence of fluid in the syringe does not rule out pathology. If the result is negative on the first attempt, the needle should not be completely withdrawn. It must be slightly shifted to the side and the aspiration attempt repeated.
Related invasive procedures: uterine sounding
In addition to culdocentesis, uterine sounding is often performed in the minor operating room immediately before minor gynecological surgeries. This is an invasive diagnostic method, the main goal of which is to establish the exact position and direction of the uterine cavity, as well as to measure its length.
An absolute contraindication to sounding is a suspected desired intrauterine pregnancy.
The "Three Ps" rule for a safe puncture: Posterior to the cervix (under the cervix), Pentral (midline), Parallel to the pelvic axis (or the posterior surface of the uterus).
Class and exam questions
In what direction is cervical traction performed during the classical puncture technique?
After grasping the posterior lip with bullet forceps, the cervix is pulled anteriorly toward the pubic symphysis.
Does an empty syringe during aspiration rule out pathology in the lesser pelvis?
No, the absence of fluid does not rule out pathology. In this case, it is necessary to shift the needle to the side without completely withdrawing it, and repeat aspiration.
What characteristics of the obtained punctate are evaluated by the physician?
The nature of the obtained fluid, its color, and transparency must be evaluated. The presence of dark blood or a clot confirms intra-abdominal bleeding.
What anesthesia is used for culdocentesis?
The procedure is performed under local infiltration anesthesia (e.g., 0.25% procaine solution) or short-term intravenous anesthesia.
What else to study on this topic
- Cytogenetic studies in gynecology: indications and markers of chromosomal abnormalities.
- Sex chromatin screening tests and rules for material collection (buccal scrape).
- Indications for mandatory karyotype testing (including suspected gonadal dysgenesis).
- Uterine sounding: detailed goals, execution technique, and strict contraindications.
- The connection between recurrent early pregnancy loss and genetic mutations.
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