Emergencies in Early Pregnancy

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Presentation transcript:

Emergencies in Early Pregnancy Emergency Medicine Clerkship Lecture Series Primary Author: David A. Wald, DO Co-Author: Michael Fiorito, MD Reviewer: David Manthey, MD

Learning Objectives Review the common causes of abdominal pain and vaginal bleeding in early pregnancy Review strategies for diagnosis and management Review the role of bedside ultrasound

Case 1 26 year old female Had a syncopal episode while at work On arrival, she is anxious and diaphoretic Initial vitals: HR 112 RR 18 BP 94/60 Lower abdominal tenderness with guarding

Case 1 Describe the initial management required to stabilize this patient? 2 large bore peripheral IV lines 18 gauge or larger Crystalloid resuscitation with normal saline

Case 1 What is your presumptive diagnosis? Ectopic Pregnancy

Differential Diagnosis of Case 1 Life threatening Benign Most likely Least likely Ectopic Pregnancy

“VASCULAR EMERGENCY” Key Point Abdominal pain and hypotension in a female of child bearing age = “VASCULAR EMERGENCY”

Ectopic Preganacy Ruptured ectopic pregnancy is the leading cause of maternal death in first trimester pregnancy Overall, accounts for 10% – 15% of maternal deaths Incidence of ectopic pregnancies have increased 4 fold in the past 30 years

Ectopic Pregnancy What is the incidence of ectopic pregnancy? The incidence is between 1:100 and 1:200 pregnancies

Ectopic Pregnancy What are the risk factors for ectopic pregnancy? PID Previous ectopic Endometriosis Previous tubal/pelvic surgery Infertility treatment Cigarette smoking

Location of Ectopic Pregnancies 80% Ampullary 12% Isthmic 5% Fimbrial 2% Cornual 1.4% Abdominal 0.2% Ovarian 0.2% Cervical

Ectopic Pregnancy Surgical management has been the traditional treatment Medical Methotrexate may be a reasonable alternative in certain stable low risk patients Hemodynamically stable Gestation < 3.5cm

Case 2 23 yo G2P1 female presents with 3 days of lower abdominal cramps spotting that started today She does not recall passing any fetal tissue

Case 2 Vital signs are stable Abdomen is soft, minimal suprapubic tenderness Cervical os is closed Minimal adnexal tenderness, no masses No active bleeding

Case 2 You perform an US… 8 week live IUP, FHT’s 176

Case 2 What is your diagnosis? Threatened miscarriage

Threatened Miscarriage Diagnosis given to a pregnant patient with vaginal bleeding and / or lower abdominal pain (early pregnancy) Cervical os is closed Has not passed any fetal products Confirmed IUP or indeterminate ultrasound if very early in pregnancy

Threatened Miscarriage Stable patients may be discharged with a non-diagnostic ultrasound Patients should have adequate follow up Repeat beta-hCG quantitative testing is recommended in 2-3 days Patients should avoid strenuous activity, but strict bed rest is not required

Miscarriage Overall, what percent of pregnancies end in miscarriage? Greater than 50% of all pregnancies end in miscarriage, most before clinical recognition After pregnancy has been recognized about 15% end in miscarriage

Miscarriage What is the likelihood of a pregnancy progressing to miscarriage once FHT’s are identified by US Usually less than 5% once cardiac activity is identified by US May be higher with advanced maternal age (>35 years)

Bleeding in Pregnancy How often does vaginal bleeding occur in early pregnancy? Vaginal bleeding occurs in ¼ - ⅓ of pregnancies

Bleeding in Pregnancy What percent of women presenting with vaginal bleeding in early pregnancy eventually miscarry Approximately 50% of pregnancies complicated by early vaginal bleeding will end in miscarriage

Case 3 27 year old G3P2012 female c/o lower abdominal cramps for 2 days She noted a small amount of spotting yesterday, but none since Based on the date of her LMP, her EGA is 126/7 weeks She had an ultrasound 4 weeks ago Live IUP, EGA 8 weeks

Case 3 Vital signs are stable Mild lower abdominal tenderness Cervical os is closed, minimal blood in the vaginal vault No active bleeding No adnexal masses or tenderness

Case 3 What is your differential diagnosis? Threatened miscarriage Missed abortion

Case 3 How should we work up this case ? Does she need a beta-hCG to assist in her ED diagnosis? Does she need any other laboratory tests? Does she need an US to assist in her ED diagnosis?

Case 3 She does not need a quantitative beta-hCG evaluation to make her ED diagnosis Because she has already had a viable IUP documented by US, a repeat US can be used to assess her fetal viability

Case 3 If the patient knows for sure that she is RH+ then she does not require a type and screen If the patient is unsure or if she is RH-, she will need a type and screen to confirm her blood type in case she requires anti-d immune globulin

Case 3 CRL corresponds to EGA 95/7 weeks No fetal heart tones

Case 3 What is the diagnosis? Missed abortion

Missed Abortion Characteristics Also referred to as an intrauterine fetal demise (IUFD) Fetus does not pass spontaneously None – mild cramps Minimal or no vaginal bleeding Cervical OS can be closed US required for diagnosis

Missed Abortion How should this case be handled? Discuss with your OB/GYN colleagues Formal consult in most institutions The patient may either be admitted for a D&E or scheduled to return for the procedure in a few days

Miscarriage Spectrum of Miscarriage Threatened Inevitable Incomplete

Miscarriage Terminology “Spontaneous abortion” is the medically correct term for pregnancy loss in the first half of pregnancy The term “miscarriage” is an acceptable alternative and often has less negative connotations for the patient

Miscarriage What is the distinction between a threatened miscarriage and an inevitable miscarriage?

Threatened Miscarriage Characteristics < 20 weeks gestation No symptoms to mild cramps Spotting to heavier bleeding Closed cervical os Diagnosis of exclusion

Inevitable Miscarriage Characteristics Mild – moderate cramps Vaginal bleeding (variable), usually heavier than threatened miscarriage Open cervical os Diagnosis can be made by PE All cases will end in miscarriage

Incomplete Miscarriage Characteristics Moderate cramps is common Vaginal bleeding (can be heavy) Open cervical os Incomplete expulsion of fetal products Diagnosis can be made by PE US may be required to identify retained fetal products

Complete Miscarriage Characteristics Total expulsion of fetal products Variable abdominal pain and vaginal bleeding Cervical os can either be closed or open Formal US may be required to exclude retained fetal products May be difficult to diagnose in the ED

Bedside Ultrasonography A brief overview… http://www.sonosite.com

EMBU Why emergency medicine US? Cost effective Resource utilization Expedite patient care Quick learning curve Answers the simple question Is there an IUP?

EMBU The goal of EMBU is to definitively identify an IUP Identification of an IUP virtually excludes the diagnosis of ectopic pregnancy Heterotopic pregnancies are very, very rare Greater incidence in women on fertility medications

Heterotopic Pregnancy

Key Point The threshold to perform a pelvic ultrasound to exclude an ectopic pregnancy in a pregnant patient with any vaginal bleeding or abdominal pain should be very low Many patients with an ectopic pregnancy are hemodynamically stable

Discriminatory Zone What is the discriminatory zone? The level of the beta-hCG above which a gestational sac should reliably be seen on ultrasound TAS ~6500 mIU/ml TVS 1500 – 2000 mIU/ml

Ultrasound Findings <5 weeks 5 weeks 5.5 weeks 6 weeks >6 weeks TV Ultrasound No GS seen Gest sac Yolk Sac Fetal pole Cardiac activity Βeta-hCG <1800 1800 1800 -3500 >3500 >>3500

Ultrasound The decision to obtain an US in a pregnant patient is based on the history and physical examination Many ectopic pregnancies will have lower than expected beta-hCG levels than expected The beta-hCG level may be helpful to better interpret a non-diagnostic US NEVER wait for the beta-hCG to determine if an US is necessary

Beta-hCG Rise in Pregnancy http://www.cdc.gov/search.do?action=search&queryText=ectopic

Ultrasound Landmarks identified by trans- abdominal sonography (TAS) occur approximately 1 week after they are identified by transvaginal sonography (TVS)

Twin Gestations

12 Week IUP

Ectopic Pregnancy

FHR 140 (Ectopic Pregnancy)

Transverse Uterus (Empty)

Key Points The common causes of vaginal bleeding in early pregnancy are: Ectopic Pregnancy Miscarriage Threatened Inevitable Incomplete Complete Missed

Final Comments All women of child bearing age: Consider pregnant until proven otherwise In a pregnant patient, ectopic pregancy should be high on your differential diagnosis list until proven otherwise

Final Comments Most ectopic pregnancies present with stable vital signs Do not discount the possibility of an ectopic gestation because the patient is stable or has only mild complaints of pain or spotting