Lesson 265: PreAnesthetic Assessment of the Obese Patient Who Insists on a Regional Block

Course Authors:

Gary Doolittle, MD, PhD, Olympia Anesthesia Associates; clinical anesthesiologist, Providence St. Peter Hospital,
Olympia, Washington

Jack Vander Beek, RN, Author of the Web site Neuraxiom.com

Andre Ceccoli, MD, Clinical anesthesiologist, Clinique St. Joseph, Chambéry, France

Registration Fee: $15.00
2.0 AMA PRA Category 1 CreditsTM
available until
July 31, 2008

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Reviewed by:

Gregory C. Allen, MD and Donald Lillegard, MD
The authors wish to acknowledge the help of Gregory C. Allen, MD, and Donald Lillegard, MD, in preparing the manuscript, and the kind and thorough assistance of the professional library staff at Providence St. Peter Hospital in Olympia, Washington.

Review Date: April, 2007

Please note the following correction to the publication - Page 49, section entitled "Ultrasound Basics":

The speed (velocity) of sound waves in different tissues varies; they travel fastest in fluids and most slowly in air. For purposes of processing and calculating, the average velocity through tissues is 1,540 m/s, or 1.54 mm/mcs. This is important because the distance to a target (reflecting layer) is determined based on the time required for an emitted sound wave to return to the probe.  Dividing the roundtrip time required for an emitted sound wave to return to the probe in microseconds by 2 (time to the layer), then multiplying the average speed to the layer in microseconds by 1.54 mm/mcs, yields the distance to the boundary in millimeters.  

NEEDS STATEMENT

Anesthesiologists are treating an increasingly large overweight population. The perioperative risks associated with obesity are well documented. Regional block techniques offer benefits to the patient for early ambulation and good pain control and are often part of office-based anesthesia. Locating nerves, however, may be technically difficult in the obese patient. New techniques have been described that assist in the precise location of specific tissues; the use of such techniques is rapidly becoming a standard of care. The descriptions of these methods have been identified as required knowledge for anesthesiologists.

     
CASE HISTORY

A 49-year-old woman was admitted to the preoperative clinic for acromioplasty and resection of the distal clavicle. The patient had a history of severe postoperative nausea and vomiting (PONV) after general anesthesia; she insisted on a regional anesthesia technique for her surgery. Her medical history was remarkable for type 2 diabetes mellitus (controlled with oral agents) and obesity (height, 163 cm; weight, 103 kg; body mass index [BMI], 39). She did not have symptoms of, nor had she received a diagnosis of, sleep apnea.

   

LEARNING OBJECTIVES

At the end of this activity, the participant should be able to:

  1. List physiologic changes that develop as the result of obesity.

  2. Appropriately evaluate the risk–benefit balance of using brachial plexus anesthesia in the obese patient.

  3. Discuss postoperative complications in obese patients.

  4. Compare outcome studies of regional anesthesia in obese and normal-weight patients.

  5. Recognize the reported risks and complications of upper extremity regional anesthesia.

  6. List the benefits of regional anesthesia.

  7. Identify ultrasound images for upper extremity blocks.

  8. Choose an appropriate ultrasound probe.

  9. Present an anesthetic plan for the obese patient undergoing block anesthesia.

  10. Explain the benefits of ultrasound-guided regional anesthesia.

 

TARGET AUDIENCE:  Anesthesiologists

INSTRUCTIONS FOR COMPLETING THIS COURSE

The estimated time to complete this activity is 2 hours. There are two options for completing this CME activity.

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Mount Sinai School of Medicine is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.

Credit Designation: The Mount Sinai School of Medicine designates each educational activity for a maximum of 2 AMA PRA Category 1 CreditsTM. Physicians should only claim credit commensurate with the extent of their participation in the activity.

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CONTACT INFORMATION

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CALL FOR WRITERS

If you would like to write a CME lesson in Anesthesiology News, please send an e-mail to Elizabeth A.M. Frost, MD, at ElzFrost@aol.com

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