Ovarian hyperstimulation syndrome - what you need to know
Ovarian hyperstimulation syndrome:
what you need to know
Who is this information for?
This information is only of relevance to women on fertility drugs to stimulate ovaryproduction.
What is OHSS?
Ovarian hyperstimulation syndrome (OHSS) is a potentially serious complication offertility treatment, particularly of in vitro fertilisation (IVF) treatment.
What are the symptoms of OHSS?
The symptoms are abdominal swelling or bloating because of enlarged ovaries,nausea and, as the condition gets worse, vomiting.
– mild abdominal swelling or bloating, abdominal discomfort and
– symptoms of mild OHSS but the swelling and bloating is
worse because fluid is building up in the abdomen. There is abdominal pain
– symptoms of moderate OHSS plus extreme thirst and
dehydration because so much fluid is building up in the abdomen, passing
very small amounts of urine which is very dark in colour (concentrated),
difficulty breathing because of build-up of fluid in the chest and a red, hot,
swollen and tender leg due to a clot in the leg or lungs (thrombosis). If you
develop any of the symptoms, seek medical help immediately.
What causes it?
Fertility drugs stimulate the ovaries to produce many egg sacs (follicles).
Sometimes there is an excessive response to fertility drugs and this causes OHSS.
Overstimulated ovaries enlarge and release chemicals into the bloodstream that makeblood vessels leak fluid into the body. Fluid leaks into your abdomen and, in severecases, into the space around the heart and lungs. OHSS can affect the kidneys, liverand lungs. A serious, but rare, complication is a blood clot (thrombosis). A very smallnumber of deaths have been reported.
Who gets it?
Mild symptoms are common in women having IVF treatment. As many as one in three(33%) women develop mild OHSS. About one in 20 (5%) women develop moderate orsevere OHSS.
The risk of OHSS is increased in women who:
get pregnant, particularly if this is a multiple pregnancy (twins or more).
How long does OHSS last?
Most of your symptoms should usually resolve in a few days. If you have mild OHSS,you can be looked after at home.
If your fertility treatment does not result in a pregnancy, OHSS will getbetter by the time your period comes.
If your fertility treatment results in a pregnancy, OHSS can get worse andlast up to a few weeks or longer.
What should I do if I have mild OHSS?
Make sure you drink clear fluids at regular intervals. Make sure you do notdrink in excess. If you have pain, take ordinary paracetamol or codeine (nomore than the maximum dose). You should avoid anti-inflammatory drugs(aspirin or aspirin-like drugs such as ibuprofen), which can affect how thekidneys are working.
Even if you feel tired, make sure you continue to move your legs.
When should I call for medical help?
Call for medical help if you develop any of the symptoms of severe OHSS, particularlyif you are not getting any pain relief.
If you start to vomit, have urinary problems, chest pain or any difficultybreathing contact your fertility clinic immediately.
If you are unable to contact your fertility clinic, contact:
your general practice the A&E department at your local hospitalNHS Direct on 0845 4647 (if you are in England or Wales)NHS 24 on 0845 24 24 24 (if you are in Scotland).
When will I need to stay in hospital?
If your symptoms get worse, or if you have the symptoms of severe OHSS, yourdoctor may advise you to be admitted to hospital.
At the hospital, the doctor will carry out the tests for mild OHSS such as blood testsand ultrasound.
If you are vomiting, you may need a drip to replace the fluids you have lost. The fluidwill help to keep you hydrated and may contain sugar and carbohydrates (for energy),minerals and chemical elements (for regulating and maintaining the organs in yourbody).
What should happen at the hospital?
There is no specific test that can diagnose OHSS. A diagnosis is made on the basis ofyour symptoms.
Your doctor will ask you to describe your symptoms and will examine you. In addition,your doctor may:
ask about how much urine you are passing and whether it is darker than normal
take an initial measurement of your waistline to see if the fluid is building upor reducing
check your weight to confirm if fluid is building up or reducing
scan your ovaries to measure how big they are and whether there is any fluidbuild-up in your abdomen
take a blood test to measure how concentrated your blood is and how well yourkidneys are working.
Your doctor should also think about other problems that can cause similar symptomsof pain and abdominal swelling. This might include pelvic infection, ovarian cysts,internal bleeding, ectopic pregnancy and appendicitis.
If you are well enough to stay at home, regular check-ups are usually performed.
What is the treatment for OHSS?
There is no treatment that can reverse OHSS.
OHSS will get better with time, so treatment is to help symptoms and preventproblems. This includes:
pain relief such as paracetamol or codeine
anti-sickness drugs to help reduce nausea and vomiting
support stockings and heparin injections to prevent a clot in the leg or lungs(thrombosis)
a procedure known as a paracentesis may be offered if your abdomen is tenseand swollen because of fluid build-up. This is when a thin needle or tube isinserted into the abdomen to remove fluid.
Is my baby at risk if I have OHSS?
There is no evidence of problems in the baby as a result of OHSS.
Is there anything else I should know?
Your fertility clinic should provide you with full written information about yourfertility treatment, including the risk of OHSS and a 24-hour helpline number.
If you develop OHSS, your fertility clinic will advise changing from hCG(human chorionic gonadotrophic) injections to progesterone injections orsuppositories. The hCG injections can make OHSS worse.
If you have mild to moderate OHSS, your ovaries are enlarged and painful.
You should avoid having sex or doing strenuous exercise to avoid injury to theovaries.
In hospital you will be under the care of a specialist.
A few women develop OHSS as an after-effect of other fertility treatment.
Human Fertilisation and Embryology Authority (HFEA)
21 Bloomsbury Street
London WC1B 3HF
Tel: 020 7291 8200
Infertility Network UK
Charter House 43 St Leonards Road
Bexhill on Sea
East Sussex TN40 1JA
Tel: 08701 188088
Sources and acknowledgements
This information is based on the Royal College of Obstetricians and Gynaecologists (RCOG) guideline
on Ovarian hyperstimulation (which was published in September 2006 and is due to reviewed in
September 2009). This information will also be reviewed, and updated if necessary, once the
guideline has been reviewed. The guideline contains a full list of the sources of evidence we have
used at: www.rcog.org.uk/resources/Public/pdf/green_top_5_management_ohss.pdf
Clinical guidelines are intended to improve care for patients. They are drawn up by teams of medicalprofessionals and consumer representatives who look at the best research evidence available andmake recommendations based on this evidence.
This information has been developed by the Patient Information Subgroup of the RCOG Guidelinesand Audit Committee, with input from the Consumers’ Forum and the authors of the clinical guideline.
It was reviewed before publication by women attending clinics in London and Bristol. The final versionis the responsibility of the RCOG Guidelines and Audit Committee
A final note
The Royal College of Obstetricians and Gynaecologists produces patient information for the public.
This is based on guidelines which present recognised methods and techniques of clinical practice,
based on published evidence. The ultimate judgement regarding a particular clinical procedure or
treatment plan must be made by the doctor or other attendant in the light of the clinical data
presented and the diagnostic and treatment options available.
Royal College of Obstetricians and Gynaecologists 2007
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