Abortion

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Synonyms and keywords:Pregnancy loss, miscarriage, spontaneous abortion

Overview

Historical Perspective

  • Abortion means termination of a pregnancy and it has been known since ancient times.


[Disease name] was first discovered by [name of scientist], a [nationality + occupation], in [year]/during/following [event].

The association between [important risk factor/cause] and [disease name] was made in/during [year/event].

In [year], [scientist] was the first to discover the association between [risk factor] and the development of [disease name].

In [year], [gene] mutations were first implicated in the pathogenesis of [disease name].

There have been several outbreaks of [disease name], including -----.

In [year], [diagnostic test/therapy] was developed by [scientist] to treat/diagnose [disease name].

Classification

Abortion can be classified into the following:[1] [2][3]


Abortion type Characterestics
Early Threatened Abortion before 12 weeks gestation

Symptoms:

Cervix:

Ultrasound:

Late Inevitable Abortion between 12 and 20 weeks gestation

Symptoms:

Cervix:

Ultrasound:

Spontaneous Noninduced abortion
Missed Undetected death of an embryo or a fetus that is not expelled and that causes no bleeding (also called blighted ovum, anembryonic pregnancy, or intrauterine embryonic demise)

Symptoms: variable, asymptomatic, light vaginal bleeding

Cervix: closed

Ultrasound: Nonviable fetus

Inevitable Vaginal bleeding or rupture of the membranes accompanied by dilation of the cervix

Symptoms: Vaginal bleeding, uterine cramps,

Cervix: Open

Ultrasound: Intrauterine fetus with possible heartbeats, ruptured or collapsed gestational sac

Incomplete Expulsion of some products of conception

Symptoms: Vaginal bleeding with large clots or tissue, uterine cramps, some products of conception can be visualized in the dilated cervical os

Cervix: Open

Ultrasound: products of conception in the cervix

Threatened Vaginal bleeding occurring before 20 weeks gestation without cervical dilation and indicating that spontaneous abortion may occur

Symptoms: variable amount of bleeding

Cervix: closed

Ultrasound: viable pregnancy

Septic Serious infection of the uterine contents during or shortly before or after an abortion. usually after induced abortion and rarely after spontaneous abortion

Symptoms: Fever, malaise, signs of sepsis, foul vaginal discharge, cervical motion tenderness, uterine tenderness, can be life threatening

Cervix: open

Ultrasound: retained products of conception

Complete Expulsion of all products of conception

Symptoms:

Cervix:

Ultrasound:

Recurrent or habitual ≥ 2 to 3 consecutive spontaneous abortions

Symptoms:

Cervix:

Ultrasound:

Therapeutic Termination of pregnancy because the woman’s life or health is endangered or because the fetus is dead or has malformations incompatible with life
Induced Termination of pregnancy for medical or elective reasons


There is no established system for the classification of [disease name].

OR

[Disease name] may be classified according to [classification method] into [number] subtypes/groups: [group1], [group2], [group3], and [group4].

OR

[Disease name] may be classified into [large number > 6] subtypes based on [classification method 1], [classification method 2], and [classification method 3]. [Disease name] may be classified into several subtypes based on [classification method 1], [classification method 2], and [classification method 3].

OR

Based on the duration of symptoms, [disease name] may be classified as either acute or chronic.

OR

If the staging system involves specific and characteristic findings and features: According to the [staging system + reference], there are [number] stages of [malignancy name] based on the [finding1], [finding2], and [finding3]. Each stage is assigned a [letter/number1] and a [letter/number2] that designate the [feature1] and [feature2].

OR

The staging of [malignancy name] is based on the [staging system].

OR

There is no established system for the staging of [malignancy name].

Pathophysiology

The exact pathogenesis of [disease name] is not fully understood.

OR

It is thought that [disease name] is the result of / is mediated by / is produced by / is caused by either [hypothesis 1], [hypothesis 2], or [hypothesis 3].

OR

[Pathogen name] is usually transmitted via the [transmission route] route to the human host.

OR

Following transmission/ingestion, the [pathogen] uses the [entry site] to invade the [cell name] cell.

OR


[Disease or malignancy name] arises from [cell name]s, which are [cell type] cells that are normally involved in [function of cells].

OR

The progression to [disease name] usually involves the [molecular pathway].

OR

The pathophysiology of [disease/malignancy] depends on the histological subtype.

Causes

Early Pregnancy Loss[4][5]

Fetal causes:

  • Genetic or chromosomal abnormalities (45,X karyotype, Trisomies (Trisomy 16 is the most common))
  • Teratogenic and mutagenic factors

Maternal causes:

  • Genetic: Maternal age is directly related to the aneuploidy risk,
  • Parental chromosomal anomaly balanced translocation

Acute causes:

  • Corpus luteum deficiency
  • Active infection such as rubella virus, cytomegalovirus

Chronic maternal comorbidities

  • Antiphospholipid syndrome
  • Severe hypertension
  • Systemic lupus erythematosus (SLE)
  • Renal disease
  • Poorly controlled diabetes mellitus
  • Polycystic ovary syndrome

Differentiating abortion from other Diseases

[Disease name] must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].

OR

[Disease name] must be differentiated from [[differential dx1], [differential dx2], and [differential dx3].

Epidemiology and Demographics

The incidence/prevalence of [disease name] is approximately [number range] per 100,000 individuals worldwide.

OR

In [year], the incidence/prevalence of [disease name] was estimated to be [number range] cases per 100,000 individuals worldwide.

OR

In [year], the incidence of [disease name] is approximately [number range] per 100,000 individuals with a case-fatality rate of [number range]%.


Patients of all age groups may develop [disease name].

OR

The incidence of [disease name] increases with age; the median age at diagnosis is [#] years.

OR

[Disease name] commonly affects individuals younger than/older than [number of years] years of age.

OR

[Chronic disease name] is usually first diagnosed among [age group].

OR

[Acute disease name] commonly affects [age group].


There is no racial predilection to [disease name].

OR

[Disease name] usually affects individuals of the [race 1] race. [Race 2] individuals are less likely to develop [disease name].


[Disease name] affects men and women equally.

OR

[Gender 1] are more commonly affected by [disease name] than [gender 2]. The [gender 1] to [gender 2] ratio is approximately [number > 1] to 1.


The majority of [disease name] cases are reported in [geographical region].

OR

[Disease name] is a common/rare disease that tends to affect [patient population 1] and [patient population 2].

Risk Factors

Independent risk factors:

  • Advanced age
  • Extremes of age
  • Feeling stressed
  • Advanced paternal age

Social causes

  • Tobacco
  • Alcohol
  • Cocaine
  • High doses Caffeine

Screening

There is insufficient evidence to recommend routine screening for [disease/malignancy].

OR

According to the [guideline name], screening for [disease name] is not recommended.

OR

According to the [guideline name], screening for [disease name] by [test 1] is recommended every [duration] among patients with [condition 1], [condition 2], and [condition 3].

Natural History, Complications, and Prognosis

If left untreated, [#]% of patients with [disease name] may progress to develop [manifestation 1], [manifestation 2], and [manifestation 3].

OR

Common complications of [disease name] include [complication 1], [complication 2], and [complication 3].

OR

Prognosis is generally excellent/good/poor, and the 1/5/10-year mortality/survival rate of patients with [disease name] is approximately [#]%.

Diagnosis

Diagnostic Study of Choice

The diagnosis of [disease name] is made when at least [number] of the following [number] diagnostic criteria are met: [criterion 1], [criterion 2], [criterion 3], and [criterion 4].

OR

The diagnosis of [disease name] is based on the [criteria name] criteria, which include [criterion 1], [criterion 2], and [criterion 3].

OR

The diagnosis of [disease name] is based on the [definition name] definition, which includes [criterion 1], [criterion 2], and [criterion 3].

OR

There are no established criteria for the diagnosis of [disease name].

History and Symptoms

The majority of patients with [disease name] are asymptomatic.

OR

The hallmark of [disease name] is [finding]. A positive history of [finding 1] and [finding 2] is suggestive of [disease name]. The most common symptoms of [disease name] include [symptom 1], [symptom 2], and [symptom 3]. Common symptoms of [disease] include [symptom 1], [symptom 2], and [symptom 3]. Less common symptoms of [disease name] include [symptom 1], [symptom 2], and [symptom 3].

Physical Examination

Patients with [disease name] usually appear [general appearance]. Physical examination of patients with [disease name] is usually remarkable for [finding 1], [finding 2], and [finding 3].

OR

Common physical examination findings of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

The presence of [finding(s)] on physical examination is diagnostic of [disease name].

OR

The presence of [finding(s)] on physical examination is highly suggestive of [disease name].

Laboratory Findings

An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of [disease name].

OR

Laboratory findings consistent with the diagnosis of [disease name] include [abnormal test 1], [abnormal test 2], and [abnormal test 3].

OR

[Test] is usually normal among patients with [disease name].

OR

Some patients with [disease name] may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].

OR

There are no diagnostic laboratory findings associated with [disease name].

Electrocardiogram

There are no ECG findings associated with [disease name].

OR

An ECG may be helpful in the diagnosis of [disease name]. Findings on an ECG suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

X-ray

There are no x-ray findings associated with [disease name].

OR

An x-ray may be helpful in the diagnosis of [disease name]. Findings on an x-ray suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

There are no x-ray findings associated with [disease name]. However, an x-ray may be helpful in the diagnosis of complications of [disease name], which include [complication 1], [complication 2], and [complication 3].

Echocardiography or Ultrasound

There are no echocardiography/ultrasound findings associated with [disease name].

OR

Echocardiography/ultrasound may be helpful in the diagnosis of [disease name]. Findings on an echocardiography/ultrasound suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

There are no echocardiography/ultrasound findings associated with [disease name]. However, an echocardiography/ultrasound may be helpful in the diagnosis of complications of [disease name], which include [complication 1], [complication 2], and [complication 3].

CT scan

There are no CT scan findings associated with [disease name].

OR

[Location] CT scan may be helpful in the diagnosis of [disease name]. Findings on CT scan suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

There are no CT scan findings associated with [disease name]. However, a CT scan may be helpful in the diagnosis of complications of [disease name], which include [complication 1], [complication 2], and [complication 3].

MRI

There are no MRI findings associated with [disease name].

OR

[Location] MRI may be helpful in the diagnosis of [disease name]. Findings on MRI suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

There are no MRI findings associated with [disease name]. However, a MRI may be helpful in the diagnosis of complications of [disease name], which include [complication 1], [complication 2], and [complication 3].

Other Imaging Findings

There are no other imaging findings associated with [disease name].

OR

[Imaging modality] may be helpful in the diagnosis of [disease name]. Findings on an [imaging modality] suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

Other Diagnostic Studies

There are no other diagnostic studies associated with [disease name].

OR

[Diagnostic study] may be helpful in the diagnosis of [disease name]. Findings suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

Other diagnostic studies for [disease name] include [diagnostic study 1], which demonstrates [finding 1], [finding 2], and [finding 3], and [diagnostic study 2], which demonstrates [finding 1], [finding 2], and [finding 3].

Treatment

Medical Therapy

There is no treatment for [disease name]; the mainstay of therapy is supportive care.

OR

Supportive therapy for [disease name] includes [therapy 1], [therapy 2], and [therapy 3].

OR

The majority of cases of [disease name] are self-limited and require only supportive care.

OR

[Disease name] is a medical emergency and requires prompt treatment.

OR

The mainstay of treatment for [disease name] is [therapy].

OR   The optimal therapy for [malignancy name] depends on the stage at diagnosis.

OR

[Therapy] is recommended among all patients who develop [disease name].

OR

Pharmacologic medical therapy is recommended among patients with [disease subclass 1], [disease subclass 2], and [disease subclass 3].

OR

Pharmacologic medical therapies for [disease name] include (either) [therapy 1], [therapy 2], and/or [therapy 3].

OR

Empiric therapy for [disease name] depends on [disease factor 1] and [disease factor 2].

OR

Patients with [disease subclass 1] are treated with [therapy 1], whereas patients with [disease subclass 2] are treated with [therapy 2].

Surgery

Surgical intervention is not recommended for the management of [disease name].

OR

Surgery is not the first-line treatment option for patients with [disease name]. Surgery is usually reserved for patients with either [indication 1], [indication 2], and [indication 3]

OR

The mainstay of treatment for [disease name] is medical therapy. Surgery is usually reserved for patients with either [indication 1], [indication 2], and/or [indication 3].

OR

The feasibility of surgery depends on the stage of [malignancy] at diagnosis.

OR

Surgery is the mainstay of treatment for [disease or malignancy].

Primary Prevention

There are no established measures for the primary prevention of [disease name].

OR

There are no available vaccines against [disease name].

OR

Effective measures for the primary prevention of [disease name] include [measure1], [measure2], and [measure3].

OR

[Vaccine name] vaccine is recommended for [patient population] to prevent [disease name]. Other primary prevention strategies include [strategy 1], [strategy 2], and [strategy 3].

Secondary Prevention

There are no established measures for the secondary prevention of [disease name].

OR

Effective measures for the secondary prevention of [disease name] include [strategy 1], [strategy 2], and [strategy 3].

References

  1. Rushton DI (1978). "Simplified classification of spontaneous abortions". J Med Genet. 15 (1): 1–9. doi:10.1136/jmg.15.1.1. PMC 1012814. PMID 564967.
  2. Ganatra B, Gerdts C, Rossier C, Johnson BR, Tunçalp Ö, Assifi A; et al. (2017). "Global, regional, and subregional classification of abortions by safety, 2010-14: estimates from a Bayesian hierarchical model". Lancet. 390 (10110): 2372–2381. doi:10.1016/S0140-6736(17)31794-4. PMC 5711001. PMID 28964589.
  3. Fujikura T, Froehlich LA, Driscoll SG (1966). "A simplified anatomic classification of abortions". Am J Obstet Gynecol. 95 (7): 902–5. doi:10.1016/0002-9378(66)90537-0. PMID 5914126.
  4. Pereza N, Ostojić S, Kapović M, Peterlin B (2017). "Systematic review and meta-analysis of genetic association studies in idiopathic recurrent spontaneous abortion". Fertil Steril. 107 (1): 150–159.e2. doi:10.1016/j.fertnstert.2016.10.007. PMID 27842992.
  5. Barut MU, Bozkurt M, Kahraman M, Yıldırım E, Imirzalioğlu N, Kubar A; et al. (2018). "Thrombophilia and Recurrent Pregnancy Loss: The Enigma Continues". Med Sci Monit. 24: 4288–4294. doi:10.12659/MSM.908832. PMC 6045916. PMID 29932168.


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