Quick answer
Conventional cervical cerclage sits low on the cervix, and when it fails the pregnancy is lost again. Laparoscopic isthmic cerclage places the stitch higher but requires abdominal surgery and a caesarean delivery. Zhang Songying at Sir Run Run Shaw Hospital found a third route: place the stitch at the uterine isthmus through the vagina. Her team reports raising the term delivery rate in recurrent miscarriage from 52% to 70%, with the largest case volume in the world [1][2].
Key takeaways
- The technique is a transvaginal isthmic cerclage — higher than a standard stitch, without laparoscopy [2].
- Reported term delivery rate rose from 52% to 70% in women with recurrent miscarriage [1].
- Case volume is described as the world's largest, with more than 700 women treated by 2015 and later figures higher [3][4].
- It can be performed during pregnancy, unlike pre-pregnancy laparoscopic cerclage [4].
- Zhang also developed a laparoscopic linear-incision technique for cornual pregnancy that preserves the intrauterine pregnancy [1].
The problem
Cervical insufficiency causes painless mid-trimester dilation and loss, often repeatedly. A standard vaginal cerclage is placed at the level of the cervix, which is below the failing segment; it helps some women but not those whose cervix has already shortened badly or been damaged by previous surgery [2].
In 1965 surgeons proposed abdominal isthmic cerclage, moving the stitch up to the isthmus to hold the pregnancy longer. It worked better but required laparotomy or laparoscopy and mandated caesarean delivery. Zhang's insight, prompted by a patient in 2003 who had lost three pregnancies, was that the same height might be reached through the vagina — a "grip at the neck" rather than a low tie [2].
What was reported
The team reports that the modified procedure raised the term delivery rate in recurrent miscarriage from 52% to 70%, and that the case volume is the largest globally. By 2015 more than 700 women had been treated, with over 200 babies born in one patient cohort. The technique has been taught to more than 100 hospitals and used in over 200,000 patients across her wider programme [1][3][4][5].
The 52%-to-70% figure and the volume claim come from award citations and media profiles rather than a randomised trial in the sources reviewed. Case-series figures of this kind are subject to selection and referral bias, and the comparison (before/after or with conventional cerclage) is not fully described. The technique's anatomical logic is sound, but independent comparative data would strengthen it [1][2].
The condition in context: recurrent miscarriage
Recurrent miscarriage affects a small proportion of couples but has an outsized psychological cost.
| Region | What the data shows | Source |
|---|---|---|
| Cervical factor | Cervical insufficiency is a leading cause of late miscarriage and preterm birth [2]. | Hangzhou Daily [2] |
| Conventional cerclage | Low placement limits effectiveness when the cervix is already short or damaged [2]. | Hangzhou Daily [2] |
| China | Zhang's technique has been adopted by more than 100 hospitals [1]. | China Civilization Network [1] |
Because each loss compounds the next pregnancy's risk and anxiety, a procedure that raises term delivery has value beyond the statistic [1].
Why it matters
| For the patient | What the report suggests | Source |
|---|---|---|
| Higher stitch | Isthmic placement holds the pregnancy longer than a low cerclage [2]. | [2] |
| Less invasive | Vaginal route avoids abdominal surgery [2]. | [2] |
| Caution | Evidence is case-series based; comparative trials are lacking [1]. | [1] |
Availability and limits
- This is an editorial summary of award and media material, not a treatment recommendation [1][2].
- No randomised comparison with conventional or abdominal cerclage is cited [1].
- Cerclage requires confirmed cervical insufficiency and exclusion of infection [2].
- The procedure needs specific training; outcomes vary by operator [1].
- Term delivery still fails in about 30% of cases [1].
What to ask before booking
| Question | Why it matters |
|---|---|
| Is my pregnancy loss due to cervical insufficiency? | The procedure only helps that mechanism [2]. |
| Which cerclage technique is proposed, and why? | Height and route determine effectiveness and delivery mode [2]. |
| Which department handles foreign patients, and in what language? | Sir Run Run Shaw Hospital is a working hospital we do not book; confirm international-department coordination and language support. |
| When in pregnancy would the stitch be placed? | The vaginal isthmic approach can be done during pregnancy [4]. |
Questions patients ask
What is a transvaginal isthmic cerclage?
A cerclage placed at the uterine isthmus through the vagina — higher than a conventional stitch but without abdominal surgery [2].
What improvement is reported?
Term delivery in recurrent miscarriage rose from 52% to 70% [1].
How many patients have been treated?
More than 700 by 2015, described as the world's largest case volume [3][4].
Is it backed by a randomised trial?
Not in the sources reviewed; the figures come from case series and award citations [1].
Is this relevant to international patients?
It is useful context for China's reproductive surgery. Sir Run Run Shaw Hospital is a working hospital we do not book — contact its international department directly [1].