Ectopic Pregnancy: Causes, Risk Factors, and Complications

 
 
Ectopic pregnancy
Dr. Manal Madany
Introduction:
The blastocyst normally implants in the endometrial lining of
the uterine cavity. Implantation anywhere else is considered
an ectopic pregnancy. It is derived from the Greek ektopos—
out of place .                                                 
I
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e
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:
-
According to the American College of Obstetricians and
Gynecologists (2008), 2 % of all first-trimester pregnancies in
the United States are ectopic, and these account for 6 % of all
pregnancy-related deaths.
C
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i
f
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Nearly 95 % of ectopic pregnancies are implanted
in the various segments of the fallopian tubes .Of
these, most are ampullary implantations. The
remaining 5 % implant in the ovary, peritoneal
cavity, or within the cervix.
 
 
 
 
 
 
R
i
s
k
 
F
a
c
t
o
r
s
1-previous ectopic pregnancy                                                                      3-13%
2-Tubal corrective surgery                                                                                4%
3-Tubal sterilization                                                                                           9%
4-Intrauterine device                                                                                      1-4%
5-Documented tubal pathology                                                               3.8–21%
6-Infertility                                                                                                  2.5–3%
7-Assisted reproductive technolog y                                                            2–8%
8-Previous genital infection                                                                         2–4 %
  Chlamydia                                                                                                    2%
  Salpingitis                                                                                          1.5–6.2%
9-Smoking                                                  1.7–4%
10-Multiple sexual partners                      1.6–3.5%
11-Prior cesarean delivery                         1–2.1%
12-
Maternal age (peak 25 to 34 years).
Mortality rate:
This condition still causes about 10% of maternal
deaths in the USA .
Pathophysiology:
In theory, any mechanical or functional factors that
prevent or interfere with the passage of the fertilized
egg to the uterine cavity may be etiological factor for
an ectopic pregnancy. In general the main cause is a
low grade infection- chronic PID.
In an ectopic pregnancy, the uterine endometrium
usually responds to the hormonal changes of
pregnancy & undergoes focal decidual
Natural history of untreated tubal
pregnancy:
1.
Tubal rupture.
2.
Pregnancy resorption.
3.
Tubal abortion into the peritoneal cavity.
Diagnosis:
Symptoms of ectopic pregnancy tend to have a poor
positive predictive value to help discriminate
between intra & extra uterine pregnancy. They may
present as acute/ subacute or silent presentation.
 
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b. Subacute presentation:
Give rise to diagnostic confusion.
1.
Abdominal pain which can be localized to one
iliac fossa.
2.
Delayed menstruation.
3.
Episodes of vaginal bleeding.
4.
There may be referred pain to shoulder.
5.
Abdominal & pelvic examination reveal sign of
peritoneal irritation less marked than in an acute
situation.
c. Asymptomatic (silent presentation).
Signs:
often have no specific signs:
1.
Rapid heart rate, low BP may be noticed.
2.
peritonism (due to intra abdominal blood if
ruptured).
3.
Gynecological examination:
      speculum or bimanual examination must be
performed in an environment where facilities for
resuscitation are available because may provoke
tubal rupture.
uterus usually normal size.
 cervical excitation & tenderness occasionally.
 adnexial tenderness.
 adnexial mass.
Investigation:
I.
Ultrasound:
Transvaginal U/S : gestational sac of an intra uterine
pregnancy should be detectable when serum B-hCG level
exeeds 1000IU/L.
The presence or absence of an intra uterine gestational sac
is the principle point of distinction between intra uterine
and tubal pregnancy.
Morphology of ectopic pregnancy can be classified by U/S
into 5 categories:
1.
Gestational sac with a live embryo.
2.
Sac with an embryo but no heart rate.
3.
Sac containing yolk sac.
4.
Empty gestational sac.
5.
Solid tubal swelling
The presence of fluid in the pouch of Douglas is
a non specific sign of ectopic pregnancy.
In 10 - 20% of ectopic pregnancy a pseudo
gestational sac is seen as a small, central located
endometrial fluid collection surrounded by a
single echogenic rim of endometrial tissue
undergoing decidual reaction.
 
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2. Serum progesterone:
Serum progesterone levels will respond quickly
to any decrease in hCG production.
Serum progsterone <20 nmol/L reflects fast
decreasing hCG levels and can be used to
diagnose spontaneous resolving pregnancies.
Progesterone level >60 nmol/L indicate normal
increase in hCG level,
 Those between 20 & 60 nmol/L are strongly
associated with abnormal pregnancy
Culdocentesis
This was used commonly in the past to identify
hemoperitoneum.
A 16-18 
gauge needle is inserted through the posterior
vaginal fornix into the cul-de-sac. If fluid 
present 
can be
aspirated, however, failure to do so is 
regarded as
 only
unsatisfactory entry into the cul-de-sac and does not
exclude an ectopic pregnancy, either ruptured or
unruptured.
Multimodality Diagnosis:
Ectopic pregnancies are identified with the combined use
of clinical findings along with serum analyte testing and
transvaginal sonography. A number of algorithms have
been proposed, but most include five key components:
1.
Transvaginal sonography
2.
Serum
 
hCG level
 
both the initial level and the pattern of
subsequent rise or decline
3.
Serum progesterone level
4.
Uterine curettage
5.
Laparoscopy and occasionally, laparotomy.
 
Management
Surgical Management
Laparoscopy is the preferred surgical treatment for
ectopic pregnancy unless the woman is hemodynamically
unstable. There have been only a few prospective studies
in which laparotomy was compared with laparoscopic
surgery
 
1-
Each method was followed by a similar number of
subsequent uterine pregnancies.
2-
Laparoscopy resulted in shorter operative times, less
blood loss, less analgesic requirements, and shorter
hospital stays
3-
Laparoscopic surgery was slightly but significantly less
successful in resolving tubal pregnancy.
4-
The costs for laparoscopy were significantly less,
although some argue that costs are similar when cases
converted to laparotomy are considered..
Tubal surgery
 
is considered conservative when there is tubal salvage.
Examples include salpingostomy, salpingotomy, and
fimbrial expression of the ectopic pregnancy.
Radical surgery is defined by salpingectomy.
 
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Salpingotomy
Seldom performed today, salpingotomy is essentially the
same procedure as salpingostomy except that the incision
is closed with delayed-absorbable suture.
Salpingectomy
Tubal resection may be used for both ruptured and
unruptured ectopic pregnancies. When removing the
oviduct, it is advisable to excise a wedge of the outer third
(or less) of the interstitial portion of the tube. This so-
called cornual resection is done in an effort to minimize
the rare recurrence of pregnancy in the tubal stump.
M
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Methotrexate 
This folic acid antagonist is highly effective against
rapidly proliferating trophoblast, and it has been used for more than
40 years to treat gestational trophoblastic disease .It is also used for
early pregnancy termination
Active intra-abdominal hemorrhage is a contraindication to
chemotherapy. other absolute contraindications include intrauterine
pregnancy; breast feeding; immunodeficiency, alcoholism; chronic
hepatic, renal, or pulmonary disease; blood dyscrasias; and peptic
ulcer disease.
 
 
Patient Selection
The best candidate for medical therapy is the woman who is
asymptomatic, motivated, and compliant. With medical therapy,
some classical predictors of success include:
1.
Initial serum  hCG level. This is the single best prognostic
indicator of successful treatment with single-dose methotrexate.
The prognostic value of the other two predictors is likely directly
related to their relationship with  hCG concentrations
2.
Ectopic pregnancy size. Although these data are less precise,
many early trials used "large size" as an exclusion criterion. a
93% success rate with single-dose methotrexate when the ectopic
mass was <3.5 cm, compared with success rates between 87-
90%  when the mass was >3.5 cm.
3.
No
Fetal cardiac activity.
E
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e
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t
a
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t
 
M
a
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a
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e
m
e
n
t
In select cases, it is reasonable to observe very early tubal
pregnancies that are associated with stable or falling
serum  hCG levels, restrict expectant management to
women with these criteria:
1.
Tubal ectopic pregnancies only
2.
Decreasing serial  hCG levels 
˂ 1500
3.
Diameter of the ectopic mass not >3.5 cm
4.
No evidence of intra-abdominal bleeding or rupture by
transvaginal sonography.
expectant therapy 
is
 undertaken only in appropriately
selected and counseled women.
 
 
 
 
 
Increasing Ectopic Pregnancy Rates
A number of reasons at least partially explain the increased rate of
ectopic pregnancies in the United States and many European
countries. Some of these include:
1-Increasing prevalence of sexually transmitted infections,
especially those caused by Chlamydia trachomatis
2-Identification through earlier diagnosis of some ectopic
pregnancies otherwise destined to resorb spontaneously
3-Popularity of contraception that predisposes pregnancy failures
to be ectopic
4-Tubal sterilization techniques that with contraceptive failure
increase the likelihood of ectopic pregnancy
5-Assisted reproductive technology
6-Tubal surgery, including salpingotomy for tubal pregnancy and
tuboplasty for infertility
Differential diagnosis of ectopic pregnancy:
Gynecologic problems:
Threatened or incomplete abortion.
Ruptured corpus luteum cyst.
Acute PID.
Adnexal torsion.
Degenerating leiomyoma (especially in
pregnancy).
Non- gynecologic problems:
Acute appendicitis.
Pyelonephritis.
Pancreatitis.
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Ectopic pregnancy occurs when a fertilized egg implants outside the uterus, most commonly in the fallopian tubes. This condition, if left untreated, can lead to serious complications, including maternal mortality. Risk factors such as previous ectopic pregnancy, tubal surgery, and smoking increase the likelihood of ectopic pregnancies. Early diagnosis is crucial to prevent severe outcomes associated with this condition.


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  1. Dr. Manal Madany

  2. Introduction: The blastocyst normally implants in the endometrial lining of the uterine cavity. Implantation anywhere else is considered an ectopic pregnancy. It is derived from the Greek ektopos out of place . Incidence:- According to the American College of Obstetricians and Gynecologists (2008), 2 % of all first-trimester pregnancies in the United States are ectopic, and these account for 6 % of all pregnancy-related deaths.

  3. Classification Nearly 95 % of ectopic pregnancies are implanted in the various segments of the fallopian tubes .Of these, most are ampullary implantations. The remaining 5 % implant in the ovary, peritoneal cavity, or within the cervix.

  4. Risk Factors 1-previous ectopic pregnancy 3-13% 2-Tubal corrective surgery 4% 3-Tubal sterilization 9% 4-Intrauterine device 1-4% 5-Documented tubal pathology 3.8 21% 6-Infertility 2.5 3% 7-Assisted reproductive technolog y 2 8% 8-Previous genital infection 2 4 % Chlamydia 2% Salpingitis 1.5 6.2%

  5. 9-Smoking 1.74% 10-Multiple sexual partners 1.6 3.5% 11-Prior cesarean delivery 1 2.1% 12-Maternal age (peak 25 to 34 years).

  6. Mortality rate: This condition still causes about 10% of maternal deaths in the USA . Pathophysiology: In theory, any mechanical or functional factors that prevent or interfere with the passage of the fertilized egg to the uterine cavity may be etiological factor for an ectopic pregnancy. In general the main cause is a low grade infection- chronic PID. In an ectopic pregnancy, the uterine endometrium usually responds to the hormonal changes of pregnancy & undergoes focal decidual

  7. Natural history of untreated tubal pregnancy: 1.Tubal rupture. 2.Pregnancy resorption. 3.Tubal abortion into the peritoneal cavity. Diagnosis: Symptoms of ectopic pregnancy tend to have a poor positive predictive value to help discriminate between intra & extra uterine pregnancy. They may present as acute/ subacute or silent presentation.

  8. Clinical presentation: A-Acute presentation (tubal rupture): 1-Acute abdominal pain referred to the shoulder tip. 2-Cardiovascular collapse. 3-Uterus slightly enlarged & there is a tender mass to one side. 4-Positive cervical excitation. .a

  9. b. Subacute presentation: Give rise to diagnostic confusion. 1.Abdominal pain which can be localized to one iliac fossa. 2.Delayed menstruation. 3.Episodes of vaginal bleeding. 4.There may be referred pain to shoulder. 5.Abdominal & pelvic examination reveal sign of peritoneal irritation less marked than in an acute situation. c. Asymptomatic (silent presentation).

  10. Signs: often have no specific signs: 1.Rapid heart rate, low BP may be noticed. 2.peritonism (due to intra abdominal blood if ruptured). 3.Gynecological examination: speculum or bimanual examination must be performed in an environment where facilities for resuscitation are available because may provoke tubal rupture. uterus usually normal size. cervical excitation & tenderness occasionally. adnexial tenderness. adnexial mass.

  11. Investigation: I.Ultrasound: Transvaginal U/S : gestational sac of an intra uterine pregnancy should be detectable when serum B-hCG level exeeds 1000IU/L. The presence or absence of an intra uterine gestational sac is the principle point of distinction between intra uterine and tubal pregnancy. Morphology of ectopic pregnancy can be classified by U/S into 5 categories: 1.Gestational sac with a live embryo. 2.Sac with an embryo but no heart rate. 3.Sac containing yolk sac. 4.Empty gestational sac. 5.Solid tubal swelling

  12. The presence of fluid in the pouch of Douglas is a non specific sign of ectopic pregnancy. In 10 - 20% of ectopic pregnancy a pseudo gestational sac is seen as a small, central located endometrial fluid collection surrounded by a single echogenic rim of endometrial tissue undergoing decidual reaction.

  13. II. Biochemical measurements: Serum hCG: Healthy normally developing pregnancies generally can be detected by a normal rate of increase of maternal serum B-hCG levels. Normal pregnancies show doubling of hCG levels every 48 hours in the first few weeks of pregnancy & sub optimal rise is suspicious of an ectopic pregnancy i.e. a prolonged hCG doubling time is an indicator of an abnormal pregnancy.

  14. 2. Serum progesterone: Serum progesterone levels will respond quickly to any decrease in hCG production. Serum progsterone <20 nmol/L reflects fast decreasing hCG levels and can be used to diagnose spontaneous resolving pregnancies. Progesterone level >60 nmol/L indicate normal increase in hCG level, Those between 20 & 60 nmol/L are strongly associated with abnormal pregnancy

  15. Culdocentesis This was used commonly in the past to identify hemoperitoneum . A 16-18 gauge needle is inserted through the posterior vaginal fornix into the cul-de-sac. If fluid present can be aspirated, however, failure to do so is regarded as only unsatisfactory entry into the cul-de-sac and does not exclude an ectopic pregnancy, either ruptured or unruptured .

  16. Multimodality Diagnosis: Ectopic pregnancies are identified with the combined use of clinical findings along with serum analyte testing and transvaginal sonography. A number of algorithms have been proposed, but most include five key components: 1.Transvaginal sonography 2.Serum hCG level both the initial level and the pattern of subsequent rise or decline 3.Serum progesterone level 4.Uterine curettage 5.Laparoscopy and occasionally, laparotomy.

  17. Management Surgical Management Laparoscopy is the preferred surgical treatment for ectopic pregnancy unless the woman is hemodynamically unstable. There have been only a few prospective studies in which laparotomy was compared with laparoscopic surgery

  18. 1-Each method was followed by a similar number of subsequent uterine pregnancies. 2-Laparoscopy resulted in shorter operative times, less blood loss, less analgesic requirements, and shorter hospital stays 3-Laparoscopic surgery was slightly but significantly less successful in resolving tubal pregnancy. 4-The costs for laparoscopy were significantly less, although some argue that costs are similar when cases converted to laparotomy are considered..

  19. Tubal surgery is considered conservative when there is tubal salvage. Examples include salpingostomy, salpingotomy, and fimbrial expression of the ectopic pregnancy . Radical surgery is defined by salpingectomy .

  20. Salpingostomy This procedure is used to remove a small pregnancy that is usually less than that is usually less than 2cm in length and located in the distal third linear incision is made with unipolar needle cautery on the antimesenteric border over the pregnancy. The products usually will extrude from the incision and can be carefully removed or flushed out using high-pressure irrigation that more thoroughly removes the trophoblastic tissue The incision is left unsutured

  21. . Salpingotomy Seldom performed today, salpingotomy is essentially the same procedure as salpingostomy except that the incision is closed with delayed-absorbable suture. Salpingectomy Tubal resection may be used for both ruptured and unruptured ectopic pregnancies. When removing the oviduct, it is advisable to excise a wedge of the outer third (or less) of the interstitial portion of the tube. This so- called cornual resection is done in an effort to minimize the rare recurrence of pregnancy in the tubal stump.

  22. Medical Management Methotrexate This folic acid antagonist is highly effective against rapidly proliferating trophoblast, and it has been used for more than 40 years to treat gestational trophoblastic disease .It is also used for early pregnancy termination Active intra-abdominal hemorrhage is a contraindication to chemotherapy. other absolute contraindications include intrauterine pregnancy; breast feeding; immunodeficiency, alcoholism; chronic hepatic, renal, or pulmonary disease; blood dyscrasias; and peptic ulcer disease.

  23. Patient Selection The best candidate for medical therapy is the woman who is asymptomatic, motivated, and compliant. With medical therapy, some classical predictors of success include: 1.Initial serum hCG level. This is the single best prognostic indicator of successful treatment with single-dose methotrexate. The prognostic value of the other two predictors is likely directly related to their relationship with hCG concentrations 2.Ectopic pregnancy size. Although these data are less precise, many early trials used "large size" as an exclusion criterion. a 93% success rate with single-dose methotrexate when the ectopic mass was <3.5 cm, compared with success rates between 87 90 % when the mass was >3.5 cm. - 3.NoFetal cardiac activity .

  24. Expectant Management In select cases, it is reasonable to observe very early tubal pregnancies that are associated with stable or falling serum hCG levels, restrict expectant management to women with these criteria: 1.Tubal ectopic pregnancies only 2.Decreasing serial hCG levels 1500 3.Diameter of the ectopic mass not >3.5 cm 4.No evidence of intra-abdominal bleeding or rupture by transvaginal sonography. expectant therapy is undertaken only in appropriately selected and counseled women .

  25. Increasing Ectopic Pregnancy Rates A number of reasons at least partially explain the increased rate of ectopic pregnancies in the United States and many European countries. Some of these include: 1-Increasing prevalence of sexually transmitted infections, especially those caused by Chlamydia trachomatis 2-Identification through earlier diagnosis of some ectopic pregnancies otherwise destined to resorb spontaneously 3-Popularity of contraception that predisposes pregnancy failures to be ectopic 4-Tubal sterilization techniques that with contraceptive failure increase the likelihood of ectopic pregnancy 5-Assisted reproductive technology 6-Tubal surgery, including salpingotomy for tubal pregnancy and tuboplasty for infertility

  26. Differential diagnosis of ectopic pregnancy: Gynecologic problems: Threatened or incomplete abortion. Ruptured corpus luteum cyst. Acute PID. Adnexal torsion. Degenerating leiomyoma (especially in pregnancy). Non- gynecologic problems: Acute appendicitis. Pyelonephritis. Pancreatitis.

  27. Thank you

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