prevention and management of preterm birth according to Malaysian MOH
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Malaysian MOH CPG prevention management preterm birth guidelines
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Malaysia MOH 2023 preterm birth guideline tocolysis progesterone cerclage corticosteroids recommendations
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Prevention and Management of Preterm Birth
Malaysian Ministry of Health (MOH) Guidelines 2023
MOH/P/PAK/516.23(GU)-e | Published by the Medical Development Division, MOH Malaysia, in collaboration with JPPOBG
The full guideline PDF is available from the MOH website.
Section 1: Introduction and Background
1.1 Definition of Preterm Birth
Preterm birth is defined as birth occurring between 22 weeks and before completed 37 weeks of gestation. It is further classified as:
| Classification | Gestational Age |
|---|---|
| Extremely preterm | < 28 weeks |
| Very preterm | 28 - < 32 weeks |
| Moderate-to-late preterm | 32 - < 37 weeks |
1.2 Burden in Malaysia
- Approximately 500,000 babies are born in Malaysia annually
- The preterm birth rate is approximately 12.3%
- Preterm birth is a leading cause of neonatal and infant mortality; risk of mortality increases as gestational age decreases
- It is aligned with the UN SDG Goal 3 (reduce neonatal mortality) and Malaysia's commitment to evidence-based maternity care
1.3 Classification by Aetiology
- Spontaneous preterm labour with intact membranes
- Preterm prelabour rupture of membranes (PPROM)
- Provider-initiated (iatrogenic) preterm birth - for maternal or fetal indications
1.4 Risk Factors
Major risk factors include:
- Previous spontaneous preterm birth or second-trimester loss (16 to <37 weeks)
- Short cervix (cervical length ≤25 mm) detected on transvaginal ultrasound
- Previous cervical surgery or trauma (e.g., LLETZ > 10 mm depth)
- Multiple pregnancy
- Uterine anomalies
- Infections: urinary tract infection, genital infections
- Low pre-pregnancy BMI
- Smoking
- Extremes of maternal age
1.5 Role of Progesterone
Progesterone plays a key prophylactic role. It is the central pharmacological intervention in the guideline's prevention strategy.
Section 2: Screening Strategies
2.1 Who to Screen - Cervical Length
High-risk population (recommended):
- Women with previous spontaneous preterm birth or second-trimester loss
- Women with a short cervix in a previous pregnancy
- Women with previous PPROM
- Previous cervical surgery/trauma (e.g., LLETZ >10 mm depth)
- Women with uterine anomalies
Low-risk population (suggested, as part of Universal Screening):
- All pregnant women (as part of the anomaly scan)
When to screen:
- Recommended timeframe: 16-24 weeks of gestation
- In high-risk populations, cervical length screening may be performed as early as the first-trimester anomaly scan
How to screen:
- Transvaginal ultrasound (TVU) measurement of cervical length is the recommended method
- Short cervix is defined as ≤25 mm
Section 3: Prevention
3.1 Progesterone
Progesterone supplementation is the cornerstone of prevention:
Indications for progesterone:
- Previous spontaneous preterm birth or second-trimester loss (between 16 to <37 weeks of gestation)
- Isolated short cervix (≤25 mm) between 16 and 24 weeks without a history of spontaneous PTB, PPROM, or cervical trauma
Indications for progesterone AND/OR cervical cerclage:
- Short cervix (≤25 mm) PLUS prior spontaneous preterm birth or second-trimester loss (16 to <37 weeks)
3.2 Cervical Cerclage
Indications for cerclage:
- Short cervix (≤25 mm) and PPROM in a previous pregnancy
- Short cervix (≤25 mm) related to previous cervical trauma
- Previous successful cerclage for cervical insufficiency in a prior pregnancy
3.3 Interventions with Limited or No Proven Benefit
The guideline identifies interventions that are NOT recommended due to lack of proven benefit:
- Bed rest
- Routine antibiotic prophylaxis (in the absence of infection)
- Home uterine monitoring
- Routine hydration/bed rest for threatened preterm labour without specific indications
Section 4: First Review and Follow-Up at O&G Specialist Clinic
Patients at high risk should be referred to and followed up at a specialist O&G clinic. A detailed risk assessment is performed, covering:
- Full obstetric and cervical history
- Cervical length measurement by TVU
- Microbiological investigations where indicated
- Decision on prevention strategy (progesterone, cerclage, or combined)
Appendix flowcharts outline:
- Flow Chart 1: Algorithm for Prevention of Spontaneous PTB - Initial and Further Risk Assessment at Peripheral Health Clinics
- Flow Chart 2: Algorithm for Prevention of Spontaneous PTB - Evaluation and Management at O&G Specialist Clinic
Section 5: Diagnosing and Treating Preterm Labour
5.1 Diagnosis of Preterm Labour
Preterm labour is diagnosed by:
- Regular uterine contractions (at least 4 in 20 minutes or 8 in 60 minutes)
- Cervical changes (effacement and/or dilatation)
- Intact or ruptured membranes
5.2 Investigations
When preterm labour is suspected, the following investigations should be performed:
- FBC (Full Blood Count)
- MSU FEME and C&S (midstream urine, full and microscopic examination, culture and sensitivity)
- Cardiotocograph (CTG)
- Ultrasound assessment (Note: Exclude gross fetal anomaly)
5.3 Tocolysis
Indication: Tocolysis is used in women with preterm labour between 24 weeks and 35 weeks 6 days of pregnancy.
Purpose: Tocolysis delays delivery by ~48 hours to allow:
- Completion of a course of antenatal corticosteroids
- In-utero transfer to a facility with appropriate neonatal care
Tocolytic agents (options):
| Agent | Route | Notes |
|---|---|---|
| Nifedipine | Oral | First-line calcium channel blocker |
| Atosiban (oxytocin receptor antagonist) | IV | Alternative to nifedipine |
| Terbutaline (Bricanyl) | SC/IV | Beta-2 agonist; preferred at district hospitals for in-utero transfer |
| Magnesium sulphate | IV | Also used for neonatal neuroprotection |
District hospital/peripheral clinic guidance: Administer SC terbutaline 0.25 mg stat for tocolysis to facilitate in-utero transfer.
Contraindications to tocolysis include:
- Non-reassuring fetal heart rate
- Clinical chorioamnionitis
- Placental abruption with fetal compromise
5.4 Antenatal Corticosteroids
Indication: Administer to women between 24 weeks and 35 weeks 6 days of pregnancy with preterm labour or PPROM.
Benefits: Reduction in:
- Neonatal death
- Respiratory distress syndrome (RDS)
- Intraventricular haemorrhage (IVH)
- Necrotising enterocolitis (NEC)
- Need for mechanical ventilation
Dosing:
- Dexamethasone OR Betamethasone 12 mg IM, two doses, 24 hours apart
Rescue (repeat) corticosteroids:
- A rescue course may improve short-term outcomes (reduced RDS, less need for surfactant, reduced composite morbidity)
- However, there is concern about association with reduced birth weight, length, and head circumference - risks increase with more courses
- Repeat antenatal corticosteroids should be used with caution and factors to consider include: interval since last course, gestational age, and likelihood of delivery within 7 days
- There is no difference in long-term outcomes with rescue courses
5.5 Magnesium Sulphate for Fetal Neuroprotection
Indication: Administer parenteral MgSO4 to women between 24 weeks and 33 weeks 6 days of pregnancy who are in established preterm labour where delivery is likely to occur soon.
Purpose: Fetal neuroprotection - reduces risk of cerebral palsy and neurodevelopmental disability in preterm neonates.
5.6 Intrapartum Antibiotics
Indications for intrapartum antibiotic prophylaxis (IAP) include:
- GBS (Group B Streptococcus) carriage in current pregnancy
- Preterm labour with unknown GBS status
- PPROM with known GBS carrier status
- Previous infant with invasive GBS disease
- GBS bacteriuria
According to the Malaysian MOH National Antimicrobial Guideline (NAG):
GBS prophylaxis (intrapartum):
- Preferred: Benzylpenicillin 5MU IV (initial dose), then 2.5-3MU IV q4h until delivery
- Alternative: Ampicillin 2g IV initial dose, then 1g IV q4h until delivery
- Mild penicillin allergy: Cefazolin 2g IV initial dose, then 1g q8h until delivery; OR Cefuroxime 1.5g IV stat then 750mg IV q8h
- Severe penicillin allergy: Vancomycin 15-20 mg/kg IV q8-12h OR Clindamycin 900mg IV q8h until delivery
PPROM antibiotic management (from MOH NAG):
- Non-GBS carrier: Erythromycin ethylsuccinate 400mg PO q6h (or 800mg PO q12h) for 7-10 days
- GBS carrier: Ampicillin 2g IV q6h for 48 hours PLUS Azithromycin 1g PO stat on admission, followed by Amoxicillin 500mg PO q8h for 5-7 days (or until delivery)
Summary of Key Recommendations at a Glance
| Intervention | Indication | Gestational Age |
|---|---|---|
| Cervical length screening (TVU) | High-risk + universal | 16-24 weeks |
| Vaginal progesterone | Short cervix ≤25 mm ± prior PTB | From detection until 34-36 weeks |
| Cervical cerclage | Short cervix + specific risk factors | Typically before 24 weeks |
| Tocolysis | Established preterm labour | 24-35+6 weeks |
| Antenatal corticosteroids | Preterm labour / PPROM | 24-35+6 weeks |
| MgSO4 for neuroprotection | Imminent preterm birth | 24-33+6 weeks |
| Intrapartum antibiotics (GBS) | GBS carriage / PTL / PPROM | At admission in labour |
Appendices Referenced in the Guideline
- Appendix 1 - Preterm Birth Screening Checklist
- Appendix 2 - Flow Chart 1: Algorithm for Prevention at Peripheral Health Clinics
- Appendix 3 - Flow Chart 2: Algorithm for Prevention at O&G Specialist Clinic
- Appendix 4 - Drafting Committee
Source: Malaysian MOH Guidelines on Prevention and Management of Preterm Birth (2023), MOH/P/PAK/516.23(GU)-e. Developed by the Obstetrical & Gynaecological and Paediatric Services Unit, Medical Development Division, MOH Malaysia, in collaboration with JPPOBG. Available at the MOH website.
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