Learning Objectives and CME/Disclosure Information

Original Launch Date: 3/31/2022

Expiration Date: 3/31/2024

ACCME PARS: 74793

This activity is intended for healthcare providers delivering care to women and their families.

After completing this activity, the participant should be better able to:

1. Describe the risks of neuraxial vs general anesthesia in pregnancy
2. Discuss the recommendations for the use of neuraxial anesthesia in the setting of maternal thrombocytopenia

Estimated time to complete activity: 0.25 hours

Faculty:

Susan J. Gross, MD, FRCSC, FACOG, FACMG President and CEO, The ObG Project

Disclosure of Financial Relationship

Postgraduate Institute for Medicine (PIM) requires faculty, planners, and others in control of educational content to disclose all their financial relationships with ineligible companies. All identified conflicts of interest (COI) are thoroughly vetted and mitigated according to PIM policy. PIM is committed to providing its learners with high quality accredited continuing education activities and related materials that promote improvements or quality in healthcare and not a specific proprietary business interest of an ineligible company.

The PIM planners and others have nothing to disclose. The OBG Project planners and others have nothing to disclose.

Faculty: Susan J. Gross, MD, receives consulting fees from Cradle Genomics.

Planners and Managers: PIM Planners have nothing to disclose

Method of Participation and Request for Credit

Participants must read the learning objectives and faculty disclosures and study the educational activity.

If you wish to receive acknowledgment for completing this activity, please complete the test and evaluation. Upon registering and successfully completing the test with a score of 100% and the activity evaluation, your certificate will be made available immediately.

Joint Accreditation Statement

In support of improving patient care, this activity has been planned and implemented by the Postgraduate Institute for Medicine and The ObG Project. Postgraduate Institute for Medicine is jointly accredited by the Accreditation Council for Continuing Medical Education (ACCME), the Accreditation Council for Pharmacy Education (ACPE), and the American Nurses Credentialing Center (ANCC), to provide continuing education for the healthcare team.

Physician Continuing Medical Education

Postgraduate Institute for Medicine designates this enduring material for a maximum of 0.25 AMA PRA Category 1 Credit(s)™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.

Continuing Nursing Education

The maximum number of hours awarded for this Continuing Nursing Education activity is 0.25 contact hours.

Read Disclaimer & Fine Print

SUMMARY:

The Society for Obstetric Anesthesia and Perinatology (SOAP) commissioned a consensus document on the topic of  neuraxial procedures in the context of thrombocytopenia. The following professional bodies were included: American Society of Regional Anesthesia and Pain Medicine (ASRA), ACOG, SMFM, and the American Society for Hematology (ASH). The panel was convened to address an ongoing issue where obstetric patients with thrombocytopenia are often denied neuraxial anesthesia due to risk of spinal epidural hematoma. However, there are significant maternal and fetal risks associated with general anesthesia during pregnancy.

Definition and Background:

• Thrombocytopenia  in pregnancy
  • Defined during pregnancy as a platelet count <150,000 x 10⁶/L
• Occurs in 7% to 12% of women
• Most common diagnoses include
  • Gestational thrombocytopenia
  • Immune thrombocytopenia
  • Thrombocytopenia associated with hypertensive disease
• Additional causes: Acute fatty liver of pregnancy | Thrombotic thrombocytopenic purpura | Inherited thrombocytopenia | Sepsis-induced thrombocytopenia

Note: For more information on thrombocytopenia in pregnancy including etiologies and management, see ‘Related ObG Topics’ below

Anesthesia Risks

Neuraxial Anesthesia: Thrombocytopenia-Related Spinal Henatoma

• Spinal hematoma is the neuraxial anesthesia complication that is associated with the highest potential morbidity
• Incidence
  • General obstetric population: 1:200,000 to 250,000
  • Incidence based on platelet count
    • 70K to 100K 10⁶/L: 0.2%
    • 50K to 69K 10⁶/L: 3%
    • <50K 10⁶/L: 11% | Most spinal epidural hematomas occur in this range
• Symptoms
  • Lower extremity motor deficit | Back pain | Lower extremities pain and paresthesia | Urinary/bowel dysfunction
  • 95% present symptoms within 48 hours of procedure
• Management
  • Prompt imaging and neurosurgical consultation are critical
  • Treatment: Decompressive laminectomy within 8 hours of symptom onset

Risks Associated with General Anesthesia

• Maternal
  • Severe adverse events related to induction | Failed tracheal intubation | Severe hypertensive response to tracheal intubation | Uterine atony | Inability to provide neuraxial opioids for pain control
• Fetal:
  • Respiratory depression | Apgar < 7 at 5 minutes | Limitation on immediate breastfeeding

Laboratory Considerations

• CBC
  • Absolute platelet count: +/- 3% coefficient of variation
  • Rarely: Low platelet counts due to clumping induced by EDTA | Collect in a tube with other anticoagulant or count manually
• PTT, PT
  • Unless coagulation defect is known or suspected, no utility in predicting bleeding risk in pregnant women with thrombocytopenia
• Thromboelastography (TED) and rotational thromboelastometry (ROTEM)
  • Dynamic point of care tests
  • Evaluate properties of blood clots subjected to rotation
  • Insufficient evidence to recommend routine use to determine safety of neuraxial anesthesia in obstetric patients with thrombocytopenia
• Platelet function analyzer (PFA-100)
  • Evaluates platelet function by stimulating in-vivo platelet plug formation
  • Insufficient evidence to recommend routine use to determine safety of neuraxial anesthesia in obstetric patients with thrombocytopenia

Platelet Transfusion Prior to Neuraxial Procedure

• Risks of platelet transfusion
  • Transfusion reaction | Circulatory overload | Acute lung injury
• Expected increase: 30K to 50K 10⁶/L after a pheresis-derived bag of platelets
  • Less effective in preeclampsia or consumption disorders
• Platelet transfusions are recommended for
  • Life-threatening hemorrhage
  • In preparation for urgent surgery
• Lack of evidence regarding efficacy: A Cochrane review assessed the benefit of platelet transfusion prior to neuraxial anesthesia and concluded that

We found no evidence from RCTs or non‐randomised studies on which to base an assessment of the correct platelet transfusion threshold prior to insertion of a lumbar puncture needle or epidural catheter

RECOMMENDATIONS: 

WITH Known Etiology of Thrombocytopenia (e.g., Gestational Thrombocytopenia, Immune Thrombocytopenia or Hypertensive Disease of Pregnancy)

• Concern for hemostasis disorder or DIC: “Reasonable to avoid neuraxial procedures”
• Platelet count ≥70K 10⁶/L: “Reasonable to proceed with neuraxial procedure”
• Platelets count between 50K and 70K 10⁶/L: “Competing risk/benefits may justify proceeding with neuraxial procedure” | Will be dependent on clinical setting
• Platelets count <50K 10⁶/L: “Reasonable to avoid neuraxial procedure”

WITHOUT Known Etiology of Thrombocytopenia 

• Concern for hemostasis disorder or DIC: “Reasonable to avoid neuraxial procedures”
• Platelet count ≥70K 10⁶/L without history of or current bleeding: “Reasonable to proceed with neuraxial procedure”
• Platelets count <70K 10⁶/L: “Additional (hematologic) work-up may be beneficial prior to proceeding with neuraxial procedure”

Aspirin Therapy in Women with Thrombocytopenia

• There is “insufficient evidence” regarding neuraxial procedures in pregnant and postpartum women with thrombocytopenia who are taking aspirin
• While the 1/2 life of aspirin is only 20 minutes, the lifetime of a platelet can be up to 10 days | However, hemostasis can be achieved with only 20% normal platelet COX activity
• Due to limited data

…clinicians and patients should engage in shared decision-making about the perceived competing risks/benefits of proceeding with or withholding neuraxial anesthesia in cases of severe thrombocytopenia and concurrent aspirin use

Frequency of Lab Testing with Preeclampsia

• Limited evidence for frequency of testing in women with thrombocytopenia and preeclampsia
• However, in the presence of HELLP, the panel recommends that “it may be reasonable to verify platelet count within 6 hours of the planned neuraxial procedure”

Learn More – Primary Sources

The Society for Obstetric Anesthesia and Perinatology Interdisciplinary Consensus Statement on Neuraxial Procedures in Obstetric Patients with Thrombocytopenia

SOAP Thrombocytopenia Consensus Statement FINAL

Cochrane Review: Use of platelet transfusions prior to lumbar punctures or epidural anaesthesia for the prevention of complications in people with thrombocytopenia

Related ObG Topics:

Gestational Thrombocytopenia – a Diagnosis of Exclusion