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Emergency And Acute Medicine – Amenorrhea
Core Overview
Amenorrhea refers to the absence of menstruation. Primary amenorrhea is defined as the absence of spontaneous uterine bleeding by age 16 years or within 5 years of breast development, which normally begins by age 13. Secondary amenorrhea is the absence of uterine bleeding for 3 months in a woman with previously regular menses or for 9 months in a woman with prior oligomenorrhea. Secondary amenorrhea is more common, and pregnancy is the most frequent cause encountered in emergency care.
Underlying Causes
Primary amenorrhea is most commonly due to gonadal failure, hypothalamic–pituitary disorders, chromosomal abnormalities, structural abnormalities such as imperforate hymen, or conditions such as Turner syndrome. Secondary amenorrhea is frequently related to pregnancy, lactation, or the postpartum state. Other causes include Asherman syndrome, dysfunction of the hypothalamic–pituitary–ovarian axis, polycystic ovarian syndrome, endocrinopathies, extremes of body weight, intense physical exercise, medications, autoimmune disease, ovarian failure, and menopause.
Clinical Features
History should focus on age at menarche, menstrual pattern, sexual activity, exercise habits, weight change, chronic illness, medication use, prior chemotherapy or CNS radiation, family history, and infertility. Physical examination may reveal signs of low estrogen such as atrophic vaginal mucosa and mood changes, or signs of hyperandrogenism including truncal obesity, hirsutism, acne, and male-pattern baldness. Thyroid examination, pelvic or genital examination, and Tanner staging are essential components of assessment.
Essential Emergency Evaluation
A pregnancy test is mandatory in all patients presenting with amenorrhea. If pregnancy testing is negative and the patient is otherwise stable, no additional emergent testing is typically required in the emergency department.
Diagnostic Testing
If pregnancy is excluded, further laboratory evaluation such as TSH, prolactin, LH, and FSH can be deferred to outpatient follow-up with gynecology or primary care. Imaging is not required emergently unless there is concern for ectopic pregnancy or another acute process based on the patient’s presentation. No diagnostic procedures are typically required in the emergency setting.
Conditions To Differentiate
Pregnancy must always be excluded first, including ectopic pregnancy when clinically suspected.
Emergency Department Management
Prehospital care is supportive. If amenorrhea is related to pregnancy, management should follow pregnancy-specific protocols. In the emergency department, treatment consists primarily of reassurance, patient education, and appropriate referral for outpatient evaluation.
Disposition And Follow-Up
Admission is not required unless there is concern for ectopic pregnancy or another emergent condition. Most patients can be safely discharged with referral to gynecology. Follow-up with a gynecologist is recommended for definitive evaluation and management.
Key Clinical Lessons And Common Errors
Pregnancy is the most important and common cause of amenorrhea in the emergency department and must always be ruled out. Urine pregnancy testing may yield false-negative results in dilute urine or early pregnancy, and serum testing should be considered when clinical suspicion is high, particularly for ectopic pregnancy. Eating disorders such as anorexia nervosa should be considered, especially in adolescents presenting with amenorrhea.
Core Overview
Amenorrhea refers to the absence of menstruation. Primary amenorrhea is defined as the absence of spontaneous uterine bleeding by age 16 years or within 5 years of breast development, which normally begins by age 13. Secondary amenorrhea is the absence of uterine bleeding for 3 months in a woman with previously regular menses or for 9 months in a woman with prior oligomenorrhea. Secondary amenorrhea is more common, and pregnancy is the most frequent cause encountered in emergency care.
Underlying Causes
Primary amenorrhea is most commonly due to gonadal failure, hypothalamic–pituitary disorders, chromosomal abnormalities, structural abnormalities such as imperforate hymen, or conditions such as Turner syndrome. Secondary amenorrhea is frequently related to pregnancy, lactation, or the postpartum state. Other causes include Asherman syndrome, dysfunction of the hypothalamic–pituitary–ovarian axis, polycystic ovarian syndrome, endocrinopathies, extremes of body weight, intense physical exercise, medications, autoimmune disease, ovarian failure, and menopause.
Clinical Features
History should focus on age at menarche, menstrual pattern, sexual activity, exercise habits, weight change, chronic illness, medication use, prior chemotherapy or CNS radiation, family history, and infertility. Physical examination may reveal signs of low estrogen such as atrophic vaginal mucosa and mood changes, or signs of hyperandrogenism including truncal obesity, hirsutism, acne, and male-pattern baldness. Thyroid examination, pelvic or genital examination, and Tanner staging are essential components of assessment.
Essential Emergency Evaluation
A pregnancy test is mandatory in all patients presenting with amenorrhea. If pregnancy testing is negative and the patient is otherwise stable, no additional emergent testing is typically required in the emergency department.
Diagnostic Testing
If pregnancy is excluded, further laboratory evaluation such as TSH, prolactin, LH, and FSH can be deferred to outpatient follow-up with gynecology or primary care. Imaging is not required emergently unless there is concern for ectopic pregnancy or another acute process based on the patient’s presentation. No diagnostic procedures are typically required in the emergency setting.
Conditions To Differentiate
Pregnancy must always be excluded first, including ectopic pregnancy when clinically suspected.
Emergency Department Management
Prehospital care is supportive. If amenorrhea is related to pregnancy, management should follow pregnancy-specific protocols. In the emergency department, treatment consists primarily of reassurance, patient education, and appropriate referral for outpatient evaluation.
Disposition And Follow-Up
Admission is not required unless there is concern for ectopic pregnancy or another emergent condition. Most patients can be safely discharged with referral to gynecology. Follow-up with a gynecologist is recommended for definitive evaluation and management.
Key Clinical Lessons And Common Errors
Pregnancy is the most important and common cause of amenorrhea in the emergency department and must always be ruled out. Urine pregnancy testing may yield false-negative results in dilute urine or early pregnancy, and serum testing should be considered when clinical suspicion is high, particularly for ectopic pregnancy. Eating disorders such as anorexia nervosa should be considered, especially in adolescents presenting with amenorrhea.
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