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In Vitro Fertilization(IVF)
IVF is an elective medical treatment usually
undertaken when other fertility therapies have been unsuccessful
or are not possible. It is a complex, multi step process, resulting
in the creation of embryos in the laboratory. The embryos are then
placed into the uterus for potential implantation. IVF treatment
enables many patients to achieve their dream of parenthood.
Once the decision is made to proceed
with IVF, several test results on both partners are usually required
to be reviewed prior to the initiation of the IVF cycle. These include
tests such as hormonal profile, ovarian reserve screening, semen
analysis, tests for infectious screening (HIV, Hepatitis B, Syphilis
etc
), genetic testing when indicated and uterine cavity assessment.
When all of the tests are completed, the treatment cycle begins.
Each patient's treatment plan is unique. In general, the steps are
as follows: The patient is placed on oral
contraceptives (birth control pills)for approximately
14-35 days. During this time a trial
transfer/ mock transfer may be performed. The patient
will then take Lupron
for approximately 12-14 days. These drugs prepare the body for the
stimulation that will follow. A baseline ultrasound is performed.
Ovarian stimulation with fertility
medications is begun and continues for approximately
10-12 days. Close monitoring with blood tests
and ultrasound examination occurs during this time. At the appropriate
time, a trigger shot of hCG is given and is followed 36-38
hours later by egg retrieval. Progesterone
supplementation is also usually started around this time. Fertilization
of retrieved eggs with the sperm sample then occurs in the laboratory
under the supervision and monitoring of an embryologist. Embryo
transfer occurs 3-5 days after the egg retrieval. A
pregnancy test is performed approximately 14 days later, followed
by subsequent ultrasounds to detect a fetal heart beat.
Medication and their dosages can confuse patients. Detailed explanations
to familiarize patients with the types of drugs and methods of administration
help eliminate confusion. Every patient's response to the medications
is unique and a patient's response from one cycle to the next may
also be different. A treatment calendar which usually outlines the
following is often helpful:
-
Type of medications
to be taken
-
Dates when these
medications are to be taken
-
The patient's visits
for blood tests and ultrasound examination, to monitor the
response to medications.
-
Other pertinent instructions
- It is crucial that patients follow these directions carefully,
as there is no room for error. Any mistake could jeopardize
the success of the treatment.
- Oral contraceptives / Birth control
pills (BCP)
Most patients
start the treatment cycle with birth control pills (oral contraceptives).
By putting the patient on BCPs, the menstrual cycle can be
manipulated. This allows for flexible scheduling, the ability
to plan ahead and to provide the patient with specific treatment
dates that can be set well in advance. The patient usually
takes these pills for a period of 2-5 weeks. This will in
no way harm the patient's chances of conceiving.
- Lupron
Lupron is
an analog of gonadotropin releasing hormone (GnRH). It suppresses
the ovaries, improves the recruitment of multiple follicles
and prevents premature ovulation. In short, it permits a better
response with the fertility medications. Lupron is administered
as a subcutaneous injection (under the skin) with a small
needle. The patient will take daily Lupron injections until
otherwise indicated, usually for 12- 14 days.
- Fertility Medications (super ovulating
drugs)
These include
one or a combination of the following: Gonal-f, Follistim,
Menopur, Bravelle, Ovidrel or Repronex (all given subcutaneously).
These medications are gonadotropins which directly stimulate
the ovaries to produce multiple eggs. The response to these
drugs varies according to the patient's age, her FSH hormone
levels and the amount of drugs given. The dose to be taken
will be clearly indicated on the treatment calendar. These
drugs are given once (usually in the evening) or twice daily
(morning and evening). Patients may need to make arrangements
with someone (partner or friend) to give these injections.
Mixing and injection instructions will be given prior to treatment.
The response to these drugs is closely monitored by vaginal
ultrasound examination and blood hormonal tests. These results
are then used to individualize subsequent medication treatment
and adjust the drug dosage, as patients move through a cycle.
At every visit, the patient is informed about the changes
in drug dosage based on the monitoring results
Monitoring
First Visit:
At the first appointment, which is 3-4 days after the start of
the fertility stimulation drugs the following will be performed:
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A blood test
for the hormone Estradiol (E2): As the follicles (containing
the eggs) mature, the eggs secrete the Estradiol hormone.
Therefore, the level of this hormone in the blood is a good
indicator of how the ovaries are responding to the drugs.
The E2 level increases over the next several days as the
eggs are maturing and the follicles growing. The more eggs
or follicles a patient has, the higher the Estradiol level
will be.
-
A vaginal ultrasound
examination: The purpose of this examination is to visualize
the ovaries and count the number of follicles present. A
follicle is the fluid-filled sac that contains the egg.
Each follicle usually contains one egg. By counting the
number of follicles, it is possible to determine how well
the patient has responded to the fertility drugs. The follicles
are also measured. The size of the follicle gives a good
idea about the maturity of the egg. As the patient continues
to take the fertility drugs, these follicles will grow (about
3 mm growth in 2 days); and at a certain point in time they
will be ready to be harvested. A mature follicle measures
around 16 mm. After evaluating the number and size of the
follicles, the thickness and pattern of the uterine lining
will also be evaluated.
During this same visit,
the patient's partner will be asked to produce a semen sample
that will be frozen for back-up. The purpose of this back-up
specimen is to have sperm available on the day of the egg retrieval.
This will prevent compromising the success of the cycle, in
the event the partner has difficulty producing a fresh semen
sample at the time of egg retrieval, or if there are issues
with quality of the sperm sample produced or if there is evidence
of infection in the sample produced.
Based on the testing results, the patient will be given specific
instructions on how to proceed with drug dosages. She will be
told what medications to continue taking and when to come back
for another blood test and ultrasound.
Follow-up Visits
During this follow-up
visit, a blood test for Estradiol and an ultrasound examination
to evaluate the growth of the follicles will again be performed.
The patient will again be given further instructions on what
to do based on the test results. Sometimes, yet another visit
for another ultrasound examination and blood estradiol level
will be required. The number of visits required prior to egg
retrieval, varies from patient to patient and from cycle to
cycle.
hCG
Injection
When the physician decides that the follicles are ready to be
aspirated (to remove the eggs), the patient will be given instructions
to take an hCG injection 36 to 38 hours prior to the Egg Retrieval.
It is crucial that the dose and the time of administration of
this medication be adhered to strictly. It provides the trigger
that will "push" the eggs through their final stages of maturation
and will release them from their attachments to the walls of the
follicles to float inside the follicular fluid. If HCG is not
taken correctly and at the exact time specified, the eggs will
not be mature and will not be able to be aspirated.
The patient will be given written instructions on how and when
to administer this medication. She will also be given a new calendar,
the hCG Calendar, which will contain new instructions about additional
medications (such as Progesterone) the patient should begin taking.
The patient will be contacted with the day and time to take the
hCG injection as well as the time that the patient has to report
for Egg Retrieval 34-36 hours later. hCG injections are usually
given at night (usually between 8 PM and 11 PM) and the Egg Retrieval
is scheduled 34-36 hours after the injection.
Progesterone
Progesterone is a hormone produced by the remainder of the follicle
after its rupture (corpus luteum). Progesterone helps the lining
of the uterus to become thick and is necessary for the implantation
of the pre-embryo. Since the estrogen levels are higher than normal
in stimulated ovarian cycles, it is necessary to administer natural
progesterone supplements to establish a normal estrogen/progesterone
ratio. These supplements will improve the uterine lining and facilitate
pre-embryo implantation. Instructions as to the exact route and
administration of natural progesterone are provided to patients.
The progesterone can be administered through a vaginal suppository
or an IM injection.
Egg
Retrieval
When the size of the leading follicles reaches 16 mm in average
diameter and the estradiol hormone level is appropriately elevated,
then it is time for the eggs to be "harvested". The hCG injection
(described in the previous section) will be administered in the
evening usually between 8 PM and 11 PM. The egg retrieval will
be scheduled 36 hours after the hCG injection. The couple needs
to be at the IVF center at least 30 minutes prior to the scheduled
time of Egg Retrieval (ER). The patient is instructed not eat
or drink anything after midnight, the night before the ER day.
Detailed Pre-Retrieval Instructions are provided to the patient
prior to scheduling the procedure.
The egg retrieval (ER) is performed under "general anesthesia"
but without intubation. The patient will not feel any discomfort
during the procedure and will wake up within 10 to 15 minutes
after the procedure. Depending on the number of follicles present,
the ER usually lasts 10 to 30 minutes. 
The ER is performed under ultrasound guidance similar to the vaginal
ultrasound examination that the patient has during monitoring
of follicle growth. A needle guide is attached to the ultrasound
probe, a long needle is introduced through the guide, and under
direct visualization each follicle is punctured and the fluid
(along with the egg floating in it) is aspirated. The fluid is
then immediately sent to the laboratory where the embryologists
search for the eggs, and isolate them. The prepared sperm will
be added to each egg and they will be allowed to incubate overnight
under controlled laboratory conditions. At the completion of the
ER, the patient is taken to the recovery area where she will stay
for about an hour. Pain medications might be administered at this
time as needed. Some discomfort is expected for a few hours following
ER and Tylenol can be taken by the patient at home as needed every
4 hours. Occasionally, some nausea might also occur which usually
dissipates within a few hours.
After about an hour when the patient is fully awake and relatively
pain-free, instructions are given by the recovery nurse and the
patient is discharged home. The patient must be accompanied by
someone who can drive her home and should not be left alone for
the rest of the day. Post-Retrieval Instructions are provided
to the patient. While the patient is undergoing ER, the partner
is asked to provide a semen sample. Abstinence from ejaculation
for two to five days prior to providing this semen specimen is
recommended. The semen is washed and prepared to fertilize the
eggs 3-4 hours later. The partner might be asked to give another
semen sample, if the first sample does not have an adequate number
of viable sperm.
Embryo Transfer
Three to five days following the Egg Retrieval, the patient
will have the Embryo Transfer (ET). During this time the fertilized
eggs (embryos) have been allowed to grow and divide in the incubator.
The patient would have also been started on Progesterone injections
and suppositories the day of hCG injection to prepare the uterine
lining for implantation. Pre-transfer instructions are provided
to the patient in advance. The physician will have a discussion
about the number and quality of the embryos at hand. A decision
will be made by the couple and their physician as to the number
of embryos that will be transferred and the number to be frozen
or discarded. The patient will then take a sedative pill. The
embryos will be separated into a separate dish and then transferred
to the transfer catheter. Meanwhile the physician will prepare
the patient for the ET.
The procedure is very similar to an artificial insemination
procedure except that embryos are transferred into the uterus
instead of sperm. A speculum is inserted in the vagina and the
cervix is washed and cleansed. The embryologist will then deliver
the catheter to the physician who introduces it through the
cervical canal into the uterine cavity where the embryos are
released. The embryologist will then check the catheter to make
sure none of the embryos are left behind in the catheter. The
whole procedure takes approximately 15 minutes. The patient
will remain in bed for about an hour. She will then be discharged
home and will need a ride back home. Post-transfer instructions
are provided to the patient. It is recommended that the patient
rests at home for 4 days following the transfer.
Pregnancy Testing
Quantitative hCG pregnancy testing is usually done fourteen days
after egg retrieval. The test is usually reported as either positive
or negative; however, a test may be reported as "weakly positive."
This could be due to one of several reasons as follows:
-
Late but normal
implantation of the embryo
-
Discontinued pregnancy
-
Ectopic pregnancy
-
4. Lab error
In such a situation, further hCG monitoring is indicated and a
second pregnancy test will be performed 2 days later. During a
normal pregnancy course, the hCG levels are expected to double
every two to three days.
An ultrasound examination will be performed approximately three
to four weeks after the egg retrieval. This early ultrasound can
help detect a miscarriage, ectopic pregnancy, and multiple pregnancies.
An ectopic (tubal) pregnancy is known to occur in 2-4% of IVF
pregnancies. If diagnosed early, this unfortunate complication
may be treated as an outpatient with medication. Once a fetal
heartbeat is detected on ultrasound examination, the patient is
referred back to their obstetrician for prenatal care.
Risks and Complications Associated with
IVF
Every medical procedure has its share of risks and complication.
This holds good for the IVF procedure as well, although every
effort is made to keep complications to a minimum. Each step of
the IVF process is associated with specific risks, some of which
are described below.
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Side effects with
Lupron therapy are short term and include hot flashes and
occasionally patients experience headaches.
-
Risks associated
with the fertility medications include tenderness, infection,
hematoma, and swelling or bruising at the injection site,
allergic reactions, hyperstimulation of the ovaries, and
failure of the ovaries to respond and cancellation of the
treatment cycle.
-
Since more than
one follicle is produced during ovarian stimulation, hormone
levels of estrogen and progesterone increase to levels much
higher than normal. When the estrogen level becomes mildly
to moderately elevated, side effects include fluid retention
with slight transient weight gain, nausea, and diarrhea,
pelvic discomfort due to enlarged cystic ovaries, breast
tenderness, mood swings, headache and fatigue.
-
Ovarian Hyperstimulation
Syndrome (OHSS): This occurs if the estrogen level rises
excessively and hCG is administered to trigger final maturation
of the eggs. The signs and symptoms include excessive fluid
retention with fluid in the abdomen and/or chest cavity;
thrombosis of arteries and/or veins (formation of blood
clots) which may lead to stroke, embolus, or potentially
fatal complications and abnormally enlarged ovaries, which
have the possibility of rupturing or twisting (a surgical
emergency). Treatment involves hospitalization. Most often,
close monitoring of estrogen levels can help prevent this
complication from occurring.
-
Risks of egg retrieval
include reactions to the drugs used to administer anesthesia
as well as risks associated with the passage of the needle
through the vagina into the ovaries (including infection,
bleeding, inadvertent damage to adjacent structures including
the bowel, bladder, blood vessels, ureter, uterus or ovary
and adhesion formation (internal scarring) following the
procedure.
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Side effects of
progesterone include vaginal dryness, bloating, breast tenderness,
depression and mood swings.
-
Embryo transfer
can cause mild cramping. There is a small risk of bleeding
or infection as a result of the transfer procedure.
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IVF is associated
with the risk of a multiple pregnancy. Women with multiple
pregnancies have a much higher risk of complicated pregnancies,
which may include the following: toxemia, pre-eclampsia,
miscarriage, premature labor and delivery, stillbirth, birth
defects, and other complications.
-
IVF is also associated
with the risk of ectopic pregnancies within the tube. A
combination of normal pregnancy and ectopic pregnancy is
also possible. A tubal ectopic pregnancy if detected early
may be treated with medication, but may require laparoscopy
or major surgery for treatment.
-
Pregnancies that
occur with IVF may result in miscarriage. This is not unique
to IVF pregnancies and can occur after spontaneous conception
as well. Sometimes, a dilatation and curettage (D&C)
may be necessary after a miscarriage.
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Congenital abnormalities,
genetic abnormalities, mental retardation or other birth
defects which occur in about 3% of spontaneously-conceived
pregnancies may still occur in children born following assisted
reproductive techniques. There is no evidence to indicate
that babies born with IVF have a higher incidence of developmental
anomalies.
Prodedural Terminology
Trial
Embryo Transfer / Mock Transfer
This procedure is performed early on, when the patient is on birth
control pills before the start of fertility medications. It consists
of a pelvic examination and placement of a tiny empty catheter
(similar to that used to transfer embryos) inside the uterus.
Since each person's birth canal is unique, this procedure helps
to determine the direction and length of the uterine cavity prior
to the actual treatment cycle. It can be likened to the creation
of a road map for the physician to follow at the time of the actual
embryo transfer. This helps minimize trauma to the uterine lining
during the actual IVF treatment cycle embryo transfer process.
It helps keep the time period between embryo removal from the
incubator to transfer into the uterine cavity to the minimum and
may enhance pregnancy rates. Sometimes, it may detect a narrowing
of the cervical canal which may require dilatation prior to embryo
transfer.
Cryopreservation
Cryopreservation is the procedure of freezing sperm or fertilized
eggs in liquid nitrogen for future reproductive use.
Cryopreservation of sperm is a routine procedure during an IVF
cycle where it serves as a backup sample at the time of egg retrieval.
Healthy sperm can be obtained from ejaculates or from liquid extracted
during a surgical procedure. The sperm is preserved by freezing
in liquid nitrogen at 320 degrees below 0 degrees Fahrenheit.
There is no evidence to indicate an increase in birth defects
between sperm that have been through the freeze-thaw procedure
and freshly ejaculated sperm.
The purpose of cryopreservation of extra embryos is to preserve
the unused embryos for future use. If the IVF fresh embryo procedure
does not result in pregnancy, the frozen embryos can be thawed
and transferred to the uterus. This frozen cycle allows for a
second or third attempt at pregnancy without exposure to all the
fertility stimulating drugs. Alternatively, if the first fresh
cycle resulted in a pregnancy, the frozen embryo's can be used
to attempt another pregnancy years later. The embryo can be frozen
in liquid nitrogen indefinitely. Cryopreservation of human embryos
has been successfully conducted worldwide for a number of years.
To date, there are no reports of increased birth defects in pregnancies
achieved through this process.
Frozen Embryo Transfer
At egg retrieval, when more eggs are retrieved than needed, majority
are inseminated with sperm resulting in excessive embryos than
are needed for the first embryo transfer. These embryos can be
frozen at any stage between day one and day six after egg retrieval
and can be stored for years. Frozen embryo transfer can be performed
after a failed IVF cycle or after a successful IVF cycle for a
second or third pregnancy. The frozen embryo transfer process
is less invasive and may be done during a natural cycle. However,
sometimes the cycle may need to be manipulated with medication
to monitor and control occurrence of natural ovulation. Before
the frozen embryo transfer can be performed, the embryos need
to be thawed. Not all embryos survive the cryopreservation process.
Before the frozen embryo transfer, the embryos are evaluated to
make sure they are ready for transfer. The embryos are placed
into the uterus at the time of ovulation and when the thickness
of the endometrium (lining of the uterus) is right. During the
procedure a catheter is inserted through the cervix and the embryos
are placed into the uterus. The frozen embryo transfer usually
takes about 15 minutes. The success rate of frozen embryo transfer
is almost as successful as standard IVF. Success depends on several
factors, including the number and quality of embryos, the patient's
age, and the cause of infertility.
Blastocyst Transfer
Blastocyst Transfer refers to the placement of the embryo in the
uterus five days after egg retrieval, rather than the traditional
three days. A blastocyst is an embryo that has developed for five
days after fertilization
and has divided into two different cell types. The embryos that
survive to day five of development are thought to be strong and
healthy, offer a greater chance of implantation into the uterine
wall and possibly more likely to result in a pregnancy. Usually
only two such blastocyst stage embryos are transferred into the
uterus, resulting in a reduction of the risk of multiple gestation
higher than twins. Blastocyst transfers can improve pregnancy
rates in specific cases while transferring fewer embryos to reduce
the risk of multiple gestations However, the primary disadvantage
of blastocyst transfer is the overall reduction in the number
of embryos that develop. Since some of the embryos will stop developing
between day 3 and day 5 in the laboratory, it results in fewer
overall embryos, fewer or no embryos to freeze (cryopreserve),
and occasionally the need to cancel the transfer if all the embryos
arrest. Therefore, blastocyst transfer is planned only after careful
consideration and discussion.
Preimplatation Genetic Diagnosis (PGD)
Preimplantation genetic diagnosis (PGD), also termed embryo biopsy,
is a procedure that can identify some genetic defects within an
embryo before it is transferred into the uterus. The patient undergoes
the normal IVF process until egg retrieval. These eggs are fertilized
by a procedure called Intracytoplasmic Sperm Injection (ICSI)
where one sperm fertilizes each egg. All embryos are biopsied
on Day 3, by removing a single cell from each embryo. Each cell
is then treated with probes for genetic abnormalities and the
DNA is evaluated to determine if the inheritance of the gene is
present. Those embryos without the genetic defect are transferred
into the uterus. Preimplantation genetic diagnosis enables couples
that carry genetic disorders to try for a biological normal child
of their own. PGD minimizes the risk of passing genetic defects
on to future generations.
Assisted Hatching
Assisted Hatching refers to the procedure wherein, a small hole
is made in the outer membrane (shell) or zona pellucida of the
embryo. The embryologist usually accomplishes this mechanically
with a microscope needle (micromanipulation), although it can
also be done chemically, or with a laser. This artificial "hatching"
is performed on embryos that may be at higher risk of having hardened
or thickened "shells", as is speculated to occur in women with
more advanced reproductive age. The opening is said to help improve
the chances of implantation of the embryo into the uterus, because
it overcomes the age related changes in the covering of the embryo
that probably interfere with the normal hatching process.
Miscellaneous
The psychological stress associated with infertility and undergoing
Assisted Reproduction procedures should not be underestimated.
Patient may experience significant anxiety and disappointment.
All patients are encouraged to consider short-term supportive
counseling during this time. Dr. Pinto will be happy to assist
patients with obtaining psychological support to help you them
through this difficult time.
Patients should be aware that IVF therapy requires substantial
time commitment by both partners. Couples will need to adjust
their schedules to undergo the required testing and therapies
associated with IVF.
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