Can the cervical canal shorten during pregnancy and still grow

After the cervical canal becomes shorter during pregnancy, it is usually difficult to naturally restore its original length, but the progression can be delayed through medical intervention. Cervical canal shortening is mainly related to factors such as increased uterine mechanical pressure, cervical dysfunction, infectious factors, multiple pregnancies, and a history of cervical surgery.

1. Increased uterine pressure:

As pregnancy progresses, the weight of the fetus and amniotic fluid continuously compresses the cervix, causing mechanical pressure that gradually shortens the cervical canal. It is recommended to reduce prolonged standing, avoid lifting heavy objects, and if necessary, use a uterine brace to relieve pressure.

2. Cervical incompetence: When the cervical tissue structure is abnormal or collagen is insufficient, it may not be able to withstand pregnancy tension, manifested as painless cervical dilation. This situation requires cervical cerclage surgery, and postoperative supportive treatment with progesterone is necessary.

3. Infection factors:

Bacterial vaginitis or chorioamnionitis can cause local inflammatory reactions, leading to cervical softening and shortening. After diagnosis through vaginal secretion testing, antibiotics such as azithromycin and clindamycin can be used for treatment.

4. Multiple pregnancies:

Twin and above pregnancies result in a significant increase in uterine volume and a doubling of cervical pressure. It is recommended that pregnant women with multiple pregnancies monitor their cervical length every two weeks starting from the 16th week of pregnancy, and if necessary, prevent cervical cerclage in advance.

5. Previous surgical history:

Cervical conization, multiple induced abortions, and other procedures may damage the cervical structure. These types of pregnant women should start dynamic ultrasound monitoring in mid pregnancy, and if cervical length is less than 25mm, immediate intervention is needed. Pregnant women with cervical canal shortening should ensure 8 hours of daily lying down rest and adopt a left lateral position to reduce uterine blood flow resistance. Increasing the intake of high-quality protein and vitamin C in the diet, such as eggs, fish, kiwifruit, etc., can help with collagen synthesis. Avoid consuming foods that may induce uterine contractions, such as hawthorn and longan. 3-5 pelvic floor muscle exercises per week can enhance cervical support. The specific method is to contract the anal muscles for 10 seconds and then relax, with 15 exercises per group. When there is lower abdominal bloating or abnormal secretion, seek medical attention immediately, and if necessary, be hospitalized for magnesium sulfate to inhibit uterine contractions. Regularly monitor changes in cervical length using transvaginal ultrasound and evaluate the risk of premature birth by combining fetal fibronectin testing.