Does a 2.9cm cervical canal require fetal protection

The length of the cervical canal is 2.9 centimeters, which is at the critical value. It is necessary to comprehensively evaluate whether to preserve the pregnancy based on the gestational age and symptoms. The main influencing factors include gestational age, history of previous miscarriage, frequency of uterine contractions, multiple pregnancies, and pathological factors such as cervical dysfunction.

1. Gestational stage:

The normal range of cervical canal length before 24 weeks of pregnancy is 3-4 centimeters, with 2.9 centimeters approaching the lower limit. The occurrence of this value in mid pregnancy requires strengthened monitoring, while in late pregnancy it may belong to physiological shortening. It is recommended to dynamically observe the trend of length changes through ultrasound and have a weekly review.

2. History of previous miscarriage: Pregnant women with a history of late miscarriage or premature birth are at a higher risk. The probability of premature birth in this population is 30% when the cervical canal is 2.9 centimeters, and preventive cervical cerclage surgery should be considered. Individuals without a history of adverse pregnancy and childbirth can be observed through restricted activities.

3. Uterine Contraction Frequency:

When accompanied by regular contractions of more than 4 times per hour, it indicates a risk of threatened premature birth. Immediate use of uterine contraction inhibitors such as ritodrine hydrochloride and supportive treatment with progesterone is required. Patients without symptoms of uterine contractions can temporarily rest in bed.

4. Multiple pregnancies:

The risk of preterm birth in twin pregnancies with a cervical canal of 2.9 cm is three times higher than in singleton pregnancies. In such cases, it is recommended to be hospitalized for monitoring and, if necessary, undergo cervical tray placement surgery. Single pregnancy can be followed up in outpatient department.

5. Cervical incompetence:

For those with congenital cervical dysplasia or a history of cervical surgery, a diameter of 2.9 cm may indicate cervical incompetence. Typical manifestations include painless dilation of the cervix, requiring emergency cervical cerclage and absolute bed rest.

It is recommended to consume 2000 milliliters of water daily to maintain amniotic fluid volume, and avoid lifting heavy objects and standing for long periods of time. Kegel exercises can be practiced to enhance pelvic floor muscle support, but if vaginal bleeding or fluid flow occurs, immediate medical attention should be sought. During sleep, use a left lateral position to improve placental blood supply, and control weight gain within 0.5 kilograms per week. Pay attention to supplementing high-quality protein such as fish and soy products in diet, while ensuring 30 grams of dietary fiber per day to prevent constipation. Keep the perineum clean, change cotton underwear twice a day, and clean with a weakly acidic solution with a pH of 5.5.