Skip to content
  • About
  • Contact
  • Contribute
  • Book
  • Careers
  • Podcast
  • Recommended
  • Speaking
  • All
  • Physician
  • Practice
  • Policy
  • Finance
  • Conditions
  • .edu
  • Patient
  • Meds
  • Tech
  • Social
  • Video
    • All
    • Physician
    • Practice
    • Policy
    • Finance
    • Conditions
    • .edu
    • Patient
    • Meds
    • Tech
    • Social
    • Video
    • About
    • Contact
    • Contribute
    • Book
    • Careers
    • Podcast
    • Recommended
    • Speaking

MKSAP: 26-year-old woman with a mechanical mitral valve prosthesis

mksap
Conditions
February 24, 2018
Share
Tweet
Share

Test your medicine knowledge with the MKSAP challenge, in partnership with the American College of Physicians.

A 26-year-old woman with a mechanical mitral valve prosthesis visits to discuss anticoagulation management during pregnancy. Her last menstrual period was 6 weeks ago and her pregnancy was confirmed by laboratory testing in the office. Her mitral valve was replaced 5 years ago. Her medications are low-dose aspirin, metoprolol, and warfarin (4 mg/d).

On physical examination, vital signs are normal. Cardiac auscultation demonstrates a normal mechanical S1. There are no murmurs or added sounds. Her INR is 2.6.

Which of the following anticoagulation regimens will provide the greatest protection against thromboembolism during her pregnancy?

A. Continue warfarin and aspirin
B. Stop warfarin and start dabigatran
C. Stop warfarin and start subcutaneous fixed-dose unfractionated heparin
D. Stop warfarin and start weight-based low-molecular-weight heparin

MKSAP Answer and Critique

The correct answer is A. Continue warfarin and aspirin.

The anticoagulation regimen that will provide the greatest protection against thromboembolism in this patient is warfarin therapy. Low-dose aspirin therapy should also be continued. Women with mechanical valve prostheses carry a high risk of valve thrombosis, bleeding, and fetal morbidity and mortality during pregnancy, and the optimal anticoagulation strategy has not been established. Options include warfarin, unfractionated heparin (UFH), and low-molecular-weight heparin (LMWH). Although warfarin poses an increased risk of teratogenicity and fetal loss, it appears to be the most effective option for reducing thromboembolism risk in the mother. The current dose of warfarin (4 mg/d), used to achieve a therapeutic INR, is associated with a low risk of warfarin embryopathy and a low risk of fetal complications.

The novel oral anticoagulants, such as dabigatran, bivalirudin, rivaroxaban, and apixaban, do not adequately protect patients with mechanical valve prostheses against thromboembolism and should not be used in pregnant or nonpregnant patients with mechanical valve prostheses.

Intravenous UFH is the anticoagulant treatment of choice around the time of delivery. Intravenous UFH can also be used during the first trimester. The dose effect must be measured by activated partial thromboplastin time and the dose adjusted to a therapeutic level. Fixed-dose subcutaneous UFH may not provide adequate anticoagulation.

LMWH can be used as an anticoagulant during pregnancy, but for patients with a mechanical valve prosthesis, a weight-based regimen has been demonstrated to be inadequate. The LMWH dose must be adjusted to anti–factor Xa activity in order to provide adequate anticoagulation.

Key Point

  • Anticoagulation strategies for pregnant women with a mechanical valve prosthesis include warfarin, dose-adjusted unfractionated heparin, and dose-adjusted low-molecular-weight heparin; of these options, warfarin poses a lesser risk of maternal thromboembolism but a greater risk of fetal embryopathy.

This content is excerpted from MKSAP 17 with permission from the American College of Physicians (ACP). Use is restricted in the same manner as that defined in the MKSAP 16 Digital license agreement. This material should never be used as a substitute for clinical judgment and does not represent an official position of ACP. All content is licensed to KevinMD.com on an “AS IS” basis without any warranty of any nature. The publisher, ACP, shall not be liable for any damage or loss of any kind arising out of or resulting from use of content, regardless of whether such liability is based in tort, contract or otherwise.

Prev

A medical student's first day in anatomy lab

February 23, 2018 Kevin 1
…
Next

5 lessons every woman doctor must learn

February 24, 2018 Kevin 0
…

Tagged as: Cardiology, OB/GYN

Post navigation

< Previous Post
A medical student's first day in anatomy lab
Next Post >
5 lessons every woman doctor must learn

ADVERTISEMENT

More by mksap

  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 26-year-old man with back pain

    mksap
  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 36-year-old man with abdominal cramping, diarrhea, malaise, and nausea

    mksap
  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 52-year-old woman with osteoarthritis of the right hip

    mksap

Related Posts

  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 35-year-old woman with constipation

    mksap
  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 60-year-old woman with persistent constipation

    mksap
  • a desk with keyboard and ipad with the kevinmd logo

    MKSAP: 45-year-old woman with type 2 diabetes mellitus

    mksap

More in Conditions

  • Why medicine must stop worshipping burnout and start valuing humanity

    Sarah White, APRN
  • Why perinatal mental health is the top cause of maternal death in the U.S.

    Sheila Noon
  • A world without vaccines: What history teaches us about public health

    Drew Remignanti, MD, MPH
  • Unraveling the mystery behind one of the most dangerous pregnancy complications: preeclampsia

    Thomas McElrath, MD, PhD and Kara Rood, MD
  • How community paramedicine impacts Indigenous elders

    Noah Weinberg
  • Pain is more than physical: the story your body is trying to tell

    Katie Hatt, DO
  • Most Popular

  • Past Week

    • Why are medical students turning away from primary care? [PODCAST]

      The Podcast by KevinMD | Podcast
    • Here’s what providers really need in a modern EHR

      Laura Kohlhagen, MD, MBA | Tech
    • Why “do no harm” might be harming modern medicine

      Sabooh S. Mubbashar, MD | Physician
    • How community paramedicine impacts Indigenous elders

      Noah Weinberg | Conditions
    • Why doctors are reclaiming control from burnout culture

      Maureen Gibbons, MD | Physician
    • Addressing U.S. vaccine inequities in vulnerable communities [PODCAST]

      The Podcast by KevinMD | Podcast
  • Past 6 Months

    • Why tracking cognitive load could save doctors and patients

      Hiba Fatima Hamid | Education
    • Why are medical students turning away from primary care? [PODCAST]

      The Podcast by KevinMD | Podcast
    • Why “do no harm” might be harming modern medicine

      Sabooh S. Mubbashar, MD | Physician
    • Here’s what providers really need in a modern EHR

      Laura Kohlhagen, MD, MBA | Tech
    • What the world must learn from the life and death of Hind Rajab

      Saba Qaiser, RN | Conditions
    • How medical culture hides burnout in plain sight

      Marco Benítez | Conditions
  • Recent Posts

    • Addressing U.S. vaccine inequities in vulnerable communities [PODCAST]

      The Podcast by KevinMD | Podcast
    • Why Canada is losing its skilled immigrant doctors

      Olumuyiwa Bamgbade, MD | Physician
    • Why doctors are reclaiming control from burnout culture

      Maureen Gibbons, MD | Physician
    • Would The Pitts’ Dr. Robby Robinavitch welcome a new colleague? Yes. Especially if their initials were AI.

      Gabe Jones, MBA | Tech
    • Why medicine must stop worshipping burnout and start valuing humanity

      Sarah White, APRN | Conditions
    • Why screening for diseases you might have can backfire

      Andy Lazris, MD and Alan Roth, DO | Physician

Subscribe to KevinMD and never miss a story!

Get free updates delivered free to your inbox.


Find jobs at
Careers by KevinMD.com

Search thousands of physician, PA, NP, and CRNA jobs now.

Learn more

Leave a Comment

Founded in 2004 by Kevin Pho, MD, KevinMD.com is the web’s leading platform where physicians, advanced practitioners, nurses, medical students, and patients share their insight and tell their stories.

Social

  • Like on Facebook
  • Follow on Twitter
  • Connect on Linkedin
  • Subscribe on Youtube
  • Instagram

ADVERTISEMENT

  • Most Popular

  • Past Week

    • Why are medical students turning away from primary care? [PODCAST]

      The Podcast by KevinMD | Podcast
    • Here’s what providers really need in a modern EHR

      Laura Kohlhagen, MD, MBA | Tech
    • Why “do no harm” might be harming modern medicine

      Sabooh S. Mubbashar, MD | Physician
    • How community paramedicine impacts Indigenous elders

      Noah Weinberg | Conditions
    • Why doctors are reclaiming control from burnout culture

      Maureen Gibbons, MD | Physician
    • Addressing U.S. vaccine inequities in vulnerable communities [PODCAST]

      The Podcast by KevinMD | Podcast
  • Past 6 Months

    • Why tracking cognitive load could save doctors and patients

      Hiba Fatima Hamid | Education
    • Why are medical students turning away from primary care? [PODCAST]

      The Podcast by KevinMD | Podcast
    • Why “do no harm” might be harming modern medicine

      Sabooh S. Mubbashar, MD | Physician
    • Here’s what providers really need in a modern EHR

      Laura Kohlhagen, MD, MBA | Tech
    • What the world must learn from the life and death of Hind Rajab

      Saba Qaiser, RN | Conditions
    • How medical culture hides burnout in plain sight

      Marco Benítez | Conditions
  • Recent Posts

    • Addressing U.S. vaccine inequities in vulnerable communities [PODCAST]

      The Podcast by KevinMD | Podcast
    • Why Canada is losing its skilled immigrant doctors

      Olumuyiwa Bamgbade, MD | Physician
    • Why doctors are reclaiming control from burnout culture

      Maureen Gibbons, MD | Physician
    • Would The Pitts’ Dr. Robby Robinavitch welcome a new colleague? Yes. Especially if their initials were AI.

      Gabe Jones, MBA | Tech
    • Why medicine must stop worshipping burnout and start valuing humanity

      Sarah White, APRN | Conditions
    • Why screening for diseases you might have can backfire

      Andy Lazris, MD and Alan Roth, DO | Physician

MedPage Today Professional

An Everyday Health Property Medpage Today
  • Terms of Use | Disclaimer
  • Privacy Policy
  • DMCA Policy
All Content © KevinMD, LLC
Site by Outthink Group

Leave a Comment

Comments are moderated before they are published. Please read the comment policy.

Loading Comments...