coasting in ivf
Post on 13-Jun-2015
244 Views
Preview:
DESCRIPTION
TRANSCRIPT
Coasting: Helpful
or Costly Mistake?
Dr Santosh GuptaMBBS,MS,FRM
Consultant, Reproductive Medicine
Ovarian Hyper-Stimulation Syndrome (OHSS)
• Serious
• Iatrogenic
• Severe OHSS can be lethal(0.1 – 2%)
Preventive strategies
• Prior to stimulation
• During stimulation
• After stimulation
Coasting
Nautical terminology
Nature Coasting
What is Coasting?
• Withholding gonadotropins with continuation of agonist or antagonist
• Drug holiday/ no stimulation
Principle
• Withholding Gonadotropins
• Apoptosis of small & medium follicles, larger follicles continue to grow
• Lesser granulosa cell population
• Reduce release of Vascular Endothelial Growth Factor-VEGF /vasoactive substances
• Lesser chance of OHSS
Serum E2 during coasting
• Classically 1st day of coasting E2 increases• Start falling gradually after 1.7days
When to start…….?
Three factors
• Serum estradiol level(reflects the functional granulosa cell population)
• Number of follicles (predicts potential for further granulosa cell proliferation and rise in E2)
• Diameter of leading follicle
CoastingTypes
• Early coasting :When growing follicles of intermediate size 12 -15 mm
• Late coasting:Growing follicle>15mmLarger follicles less dependent on FSH
Coasting… systemic review
Coasting …….
• Reduces severe OHSS
• Reduces /eliminates cycle cancellation
• Reduces cost of therapy
• More chances of fresh transfer
• Thus offers best chance in index cycle
• Reduces distress of cancellation , OHSS and
cryopreservation of all embryos
Coasting may spoil cycle outcome..???
Days of coasting(Mansour et al, 2005)
Is early coasting feasible……??
Early and late coasting Chen Chao et al ,fert sterl 2003
Coasting in PCOS when E2 level >1500 but <3000pg/ml
(Egbase et al, human reprod 2002)
E2 on coasting D1 1943±693
E2 on coasting D2 2526±1063
E2 on coasting D3 2169±9753.6
No of follicles 25.2±4.1
No of oocytes retrieved 16.5±3.6
Fertilization rate 74%
Cleavage rate 88%
No of embryo transferred 2.4±0.2
Clinical pregnancy rate 45%
Severe OHSS nil
All pts PCOS with high BMI
Does it really reduces OHSS……?
coasting with antagonist ???
Antag coasting
Antagonist coasting
• Long protocol with hyper-stimulation can be coasted with antagonist switching resulting in rapid fall in E2
• Mean coasting days were significantly less in antag gp(1.74 vs 2.82,p value<0.0001)
• No significant difference in clinical pregnancy rate
(Aboulgar et al 2011, fert sterl)
Will it spoil my embryos……..??
Coasting and endometrial receptivityV. Ifaza ,Garcia et al, hum rep, 2002
• Coasting might impair endometrial receptivity
• Prolonged coasting associated with luteinization of endometrium
• Poor endometrial receptivity d/t high E2 level
• Thus embryo quality and implantation potential is best studied in recipients having donor oocytes from coasted vs non coasted donors
Embryo Quality in Coasting
recipient Coasted donor Non coasted donor P value
M II oocytes 6.9 7.4 ns
Fertilization rate 80.7% 83.3% ns
Cleavage rate 92% 96% ns
Embryos transferred/pt 2.6 2.9 ns
Implantion rate 22 27.7 ns
Preg rate 52.9% 54.5% ns
When coasted more than four days implantation rate was significantly low in coasted donor group probably due to bad quality oocytes /embryosImplantation rate 30.5 % vs 11.3% (p value<0.005,sign)Pregnancy rate 72% vs 37% (p value <0.005,sign)
Ifiza etal , hum rep 2002
Can we stop agonist also….???
Step Wise Integrated Approach
• Tailor made protocol• Lesser dose Gn• Step down• Coasting• Low dose hCG/ agonist trigger• Albumin/bromocriptine• Cryopreservation
Take home message
Coasting is one of the very important tool to prevent OHSS without
compromising clinical outcome
Coasting is equally feasible with antagonist protocol
Thank you
Have
safe
stimulation
top related