骨盆 II: 窥镜考试成绩

The speculum exam is used in a wide variety of gynecological procedures and can provide a wealth of diagnostic information. The speculum is a bivalve instrument, which is utilized for separating the walls of the vaginal canal. This not only allows for visual inspection of the cervix, but also provides an access to this region for specimen collection during diagnostic procedures such as the Papanicolau, or Pap test, which is performed to check for any precancerous changes. This video will illustrate the proper technique of using the speculum for cervical inspection, and the appropriate method for collection of samples for the Pap test.

Let’s begin with the review of the steps involved in prepping for the speculum exam and the Pap test, followed by a discussion of what a physician should look for while inspecting the cervix through the speculum. There are different types of commercially available specula. Some are made up of disposable plastic, while the metal ones are reusable. In this demonstration, we will use a plastic speculum.

Before starting the exam, it is essential to familiarize yourself with the instrument to be used and understand how it functions. After that you shall begin with the exam. Remember, this procedure usually comes after the external pelvic inspection, so at this point the patient history has been obtained, and they are already in the modified lithotomy position.

Make sure that the patient is seated at the end of the table to allow compete insertion of the speculum. Also lay out the supplies for the Pap test, including a cytology canister; lubricant squeezed onto a clean tray with a liner, and a spatula and endocervical brush OR just a cervical broom to collect the cell sample.Label the liquid cytology canister with the patient’s information. Then unscrew the lid of the canister until it is resting on top such that it can be easily lifted off.

It is essential to understand how to hold a speculum. In case you’re using a plastic speculum, place it in your non-dominant hand and position your index finger above the bills, your middle finger below the bills, and your thumb on the back of the speculum, avoiding the thumb lever as that would open the speculum. Using your dominant hand spread the water-based lubricant on the outside of the bills. Show the speculum to the patient without pointing it directly at them, and let them know what to expect during the exam, “Dialogue”.

Start by letting the patient know that you will first place the back of your hand on their thigh. This is done to prepare the patient for the exam by establishing a non-invasive contact first. Now separate the labia minora with the dominant index and middle finger pads to get a clear view of the vaginal introitus. Next, explain the relaxation technique to the patient, “Dialogue”. The vaginal introitus should open up as the patient bears down. Let the patient know that you are about to insert the speculum, “Dialogue” and place it halfway into the vaginal canal, keeping the bills at about 45° angle. Next, bring your non-dominant hand to the bottom handle and rotate the speculum flat, while simultaneously clearing the labia on both sides. Then angle the tip of the bills toward the floor and insert fully, such that the tip ends up below the cervix. Stop when the speculum is flushed against the patient’s pelvis.

Next place one of the dominant fingers inside the bills and apply strong posterior pressure while pulling down on the handle with the other hand until it is perpendicular to the floor. Make sure you apply enough pressure to see the space above the speculum. Now, while maintaining posterior pressure with the finger inside the speculum, you can smoothly depress the thumb lever to open the bills. Stop once resistance is met. Then engage the lock by pushing the thumb lever up one or two clicks and remove the finger from inside the speculum. Hold the speculum steady and, using a light source, check if the cervix is visible. Note the tone, color, and position of the cervix and observe for discharge, lesions, polyps, ulcerations, and masses.

You can visually inspect the lower intravaginal part of the cervix. This includes the exocervix, which is normally 2-3 cm in diameter, pink in color, and has a smooth surface; the external os, which is the opening of the endocervix into the vagina; and the four fornices, which are the recesses between the cervix margin and the vaginal wall.

After the visual inspection of the cervix, proceed to collecting samples for the Pap test. With the speculum still in place, insert the spatula into the vagina, being careful not to touch the walls. Position the spatula with its long end in the os, and the short end pressed against the junction. Now rotate it 360°, while maintaining consistent pressure and contact with the exocervix. Carefully remove the spatula avoiding the vaginal walls. Place the spatula into the open cytology canister and thoroughly rinse it by vigorous swirling in the liquid following the manufacturer’s instructions. Next, insert the endocervical brush into the vagina avoiding contact with the walls. Push the brush into the os until only the bottom bristles are exposed and then slowly rotate it 180° in one direction. Do not over rotate. Carefully remove the brush avoiding the walls, and place it into the cytology canister. Thoroughly rinse the brush by vigorous swirling and press it repeatedly against the sides of the canister to release material. Instead of using both spatula and brush, one can use just the endocervical broom, which has different sizes of bristles forming a triangular pattern. If using this, then you would insert it so the longer bristles rest in the os and the shorter rest on the transition zone and rotate it about five to ten times, depending on manufacturer’s instructions. The release of the sample is same as for that for the endocervical brush.

After sample collection is complete, release the locking mechanism by pressing down on the thumb lever, and while holding the lever down and bills open, remove the speculum about two to three inches out, to ensure that the cervix is cleared off the tip of the bills. Remove your thumb from the lever and place it on the handle. Finally, rotate the speculum by 45° while smoothly removing it all the way out. Have your hand underneath the speculum to catch any possible discharge, and discard the speculum, if disposable. At the end, replace the canister lid. Now the sample is ready for subsequent cytological analysis.

“Examiner explaining different types of specula-the similarities and differences”

You’ve just watched JoVE’s illustration of the speculum exam and the Pap test. You should now understand how to use the vaginal speculum and how to collect cervical cell sample for diagnostic evaluation. As always, thanks for watching!