What is OHSS Prevention?
💡 OHSS prevention uses pre-stimulation risk stratification (AMH, AFC, PCOS) and intra-cycle modifications: low-dose stimulation, close monitoring, GnRH agonist trigger, freeze-all strategy, and dopamine agonist (cabergoline). Severe OHSS can be reduced to <0.5% in high-risk patients with a comprehensive protocol.
OHSS prevention is the suite of clinical strategies used during IVF stimulation to identify high-risk patients and modify the protocol to prevent ovarian hyperstimulation syndrome. With appropriate risk stratification and preventive interventions, severe OHSS can be reduced to near zero.
🇮🇳 India Context: OHSS Prevention is widely assessed and treated across major Indian fertility centres including Chennai, Mumbai, Bangalore, Delhi, and Hyderabad.
What are the key characteristics of OHSS Prevention?
- Risk stratification: AMH >3.0 ng/mL, AFC >20, PCOS, age <35, BMI <20, prior OHSS — all indicate high risk
- Low-dose stimulation start: 100–150 IU/day for high-risk patients vs 225–450 IU/day standard protocol
- Close monitoring: transvaginal ultrasound every 1–2 days from Day 6–8 to count follicles and adjust dose
- Dose adjustment (coasting): gonadotropin dose reduced or held if E2 rises rapidly or >15 follicles develop
- GnRH agonist trigger (instead of hCG): reduces OHSS risk by >90% — requires antagonist stimulation protocol
- Freeze-all strategy: all embryos cryopreserved — eliminates late OHSS by removing endogenous hCG from early pregnancy
- Dopamine agonist (cabergoline 0.5mg/day × 7 days post-trigger): reduces VEGF-mediated vascular permeability
- Cycle cancellation: last resort if >25 mature follicles or E2 >5000 pg/mL — prevents life-threatening OHSS
How does OHSS Prevention work?
Why does OHSS Prevention matter in fertility?
OHSS prevention does not compromise IVF outcomes. GnRH agonist trigger combined with freeze-all produces equivalent or superior live birth rates to fresh transfer in high-risk patients — while reducing severe OHSS to near zero. The most impactful single intervention is freeze-all: removing the embryo from the OHSS-risk environment entirely. Cabergoline and individualised dosing are adjuncts. In India, OHSS prevention protocols are implemented at all NABH-accredited IVF centres as a mandatory safety standard; patients at high risk should be explicitly counselled before stimulation begins.
What are related terms to OHSS Prevention?
FAQs about OHSS Prevention
How is OHSS prevented in IVF?
OHSS is prevented through: pre-cycle risk stratification (AMH, AFC, PCOS), low-dose stimulation start (100–150 IU/day), close monitoring, GnRH agonist trigger (instead of hCG), freeze-all strategy, and cabergoline (0.5mg/day × 7 days). Severe OHSS can be reduced to near zero with this protocol.
What is a GnRH agonist trigger and why does it prevent OHSS?
GnRH agonist trigger replaces the standard hCG trigger shot. It causes a shorter, physiological LH surge that induces final oocyte maturation with significantly less VEGF stimulation — reducing OHSS risk by >90%. It requires an antagonist stimulation protocol and must be paired with freeze-all for optimal outcomes.
What is freeze-all and how does it prevent OHSS?
Freeze-all means cryopreserving all embryos and performing no fresh transfer. It prevents late OHSS by eliminating endogenous hCG from early pregnancy — the main driver of prolonged, severe late OHSS. All frozen embryos are transferred in a subsequent natural or medicated FET cycle after ovarian recovery.
What is cabergoline used for in IVF?
Cabergoline is a dopamine agonist given at 0.5mg/day for 7 days post-trigger in high-risk patients. It reduces VEGF-mediated vascular permeability — lowering fluid leakage without affecting egg quality. It is an adjunct to (not a replacement for) GnRH agonist trigger and freeze-all in OHSS prevention.
Can OHSS be prevented in PCOS patients undergoing IVF?
Yes. PCOS patients should receive low-dose stimulation (100 IU/day start), close monitoring from Day 5–6, GnRH agonist trigger, and freeze-all strategy. With this combined approach, severe OHSS in PCOS patients can be reduced to near zero without compromising IVF egg yield or embryo quality.
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