In an obese patient, the ultrasound waves have farther to travel and are attenuated along the way. The lower end of the frequency range should be used in obese patients, which can compromise detail but allows for better penetration.
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ACEP News: Vol 30 – No 04 – April 2011Further Reading
- Ma OJ, Mateer JR, Ogata M, et al. Prospective analysis of a rapid trauma ultrasound examination performed by emergency physicians. J. Trauma 1995;38:879-85.
- Durham B, Lane B, Burbridge L, et al. Pelvic ultrasound performed by emergency physicians for the detection of ectopic pregnancy in complicated first-trimester pregnancies. Ann. Emerg. Med. 1997;29:338-47.
- Plummer D, Brunnette D, Asinger R, et al. Emergency department echocardiography improves outcome in penetrating cardiac injury. Ann. Emerg. Med. 1992;21:709-12.
- Kuhn M, Bonnin RL, Davey MJ, et al. Emergency department ultrasound scanning for abdominal aortic aneurysm: accessible, accurate, and advantageous. Ann. Emerg. Med. 2000;36:219-23.
- Rosen C, Brown DFM, Chang Y, et al. Ultrasonography by emergency physicians in patients with suspected cholecystitis. Am. J. Emerg. Med. 2001;19:32-6.
- Hoffner RJ, Chan D, Esekogwu VI, et al. The role of emergency department ultrasonography versus intravenous pyelography in the evaluation of suspected ureteral colic. Acad. Emerg. Med. 1997;4:392.
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