Publications by authors named "Michael A Mahlon"

2 Publications

  • Page 1 of 1

Ultrasound-Guided Biceps Tendon Sheath Injections Frequently Extravasate Into the Glenohumeral Joint.

Arthroscopy 2021 06 13;37(6):1711-1716. Epub 2021 Jan 13.

Madigan Army Medical Center, Joint Base Lewis-McChord, Washington, U.S.A.

Purpose: To evaluate the frequency of glenohumeral joint extravasation of ultrasound (US)-guided biceps tendon sheath injections.

Methods: Fifty shoulders with a clinical diagnosis of bicipital tenosynovitis pain received a US-guided biceps sheath injection with anesthetic, steroid, and contrast (5.0 mL mixture) followed immediately by orthogonal radiographs to localize the anatomic distribution of the injection. Radiographic evaluation of contrast localization was determined and interobserver reliability calculated.

Results: All 50 postinjection radiographs (100%) demonstrated contrast within the biceps tendon sheath. In addition, 30 of 50 (60%) radiographs also revealed contrast in the glenohumeral joint. Interobserver reliability for determination of intraarticular contrast was good (kappa value 0.87).

Conclusions: US-guided bicipital sheath injections reproducibly result in intrasheath placement of injection fluid. Bicipital sheath injections performed with 5 mL of volume result in partial extravasation into the joint 60% of the time. These data may be useful for surgeons who use the results of diagnostic biceps injections for diagnosis and surgical decision-making.

Level Of Evidence: III, prospective cohort study, diagnosis.
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June 2021

CT angiography of the superior vena cava: normative values and implications for central venous catheter position.

J Vasc Interv Radiol 2007 Sep;18(9):1106-10

Department of Radiology, Tripler Army Medical Center, Honolulu, Hawaii, USA.

Purpose: To determine normative data for radiographic landmarks of the superior vena cava (SVC) and the location of the junction of the SVC with the right atrium for use in the placement of central venous catheters.

Materials And Methods: The authors retrospectively reviewed 112 pulmonary computed tomographic (CT) angiograms obtained in seven men and seven women from each decade of life between the ages of 20 and 99 years. For each patient, the length of the SVC was measured from its origin to the cavoatrial junction. The distances from the carina and right tracheobronchial angle to the cavoatrial junction and the origin of the SVC were also measured. Interobserver variation in choosing the location of the carina and tracheobronchial angle was analyzed.

Results: The mean length (+/-standard deviation) of the SVC was 70.7 mm +/- 14.1. The mean distance from the superior margin of the SVC to the carina was 30.4 mm +/- 11.2, from the carina to the cavoatrial junction 40.3 mm +/- 13.6, from the superior margin of the SVC to the right tracheobronchial angle 21.7 mm +/- 10.8, and from the right tracheobronchial angle to the cavoatrial junction 49.0 mm +/- 13.6. There was a statistically significant difference in interobserver variation in selecting the location of the right tracheobronchial angle as compared to choosing the carina.

Conclusion: Placement of the central venous catheter tip at or just below the level of the carina during inspiration ensures placement in the SVC. Placement of the central venous catheter tip approximately 4 cm below the carina will result in placement near the cavoatrial junction.
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September 2007