Osborn Waves of Hypothermia
2000; Lippincott Williams & Wilkins; Volume: 101; Issue: 25 Linguagem: Inglês
10.1161/01.cir.101.25.e233
ISSN1524-4539
AutoresImad A. Alhaddad, Mohammed Khalil, Edward J. Brown,
Tópico(s)Atrial Fibrillation Management and Outcomes
ResumoHomeCirculationVol. 101, No. 25Osborn Waves of Hypothermia Free AccessOtherPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessOtherPDF/EPUBOsborn Waves of Hypothermia Imad A. Alhaddad, Mohammed Khalil and Edward J. BrownJr Imad A. AlhaddadImad A. Alhaddad From the Cardiology Division, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY. , Mohammed KhalilMohammed Khalil From the Cardiology Division, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY. and Edward J. BrownJrEdward J. BrownJr From the Cardiology Division, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY. Originally published27 Jun 2000https://doi.org/10.1161/01.CIR.101.25.e233Circulation. 2000;101:e233–e244A12-lead ECG was obtained from a 72-year-old man with a core body temperature of 85°F (Figure 1). The ECG shows severe sinus bradycardia with prolonged PR, prolonged QRS complex, prolonged QT interval, and an extra deflection at the end of the QRS complex (Osborn waves) (arrows). A second 12-lead ECG obtained 24 hours later, after the patient had been rewarmed to 98°F, was normal (Figure 2).Hypothermia, defined as core body temperature <95°F, is associated with ECG changes of diagnostic and prognostic importance. In the initial stages of hypothermia, a sinus tachycardia develops as part of the general stress reaction. As the temperature drops below 90°F, a sinus bradycardia supervenes, associated with progressive prolongation of the PR interval, QRS complex, and QT interval. With temperature approaching 86°F, atrial ectopic activity is often noted and can progress to atrial fibrillation. At this level of hypothermia, 80% of patients have Osborn waves that consist of an extra deflection at the end of the QRS complex.Osborn waves, also known as J waves, camel-hump waves, and hypothermic waves, are best seen the inferior and lateral precordial leads. They become more prominent as the body temperature drops, and they regress gradually with rewarming.With temperature <86°F, a progressive widening of the QRS complex increases the risk of ventricular fibrillation. When the temperature drops to ≈60°F, asystole supervenes. The editor of Images in Cardiovascular Medicine is Hugh A. McAllister, Jr, MD, Chief, Department of Pathology, St Luke's Episcopal Hospital and Texas Heart Institute, and Clinical Professor of Pathology, University of Texas Medical School and Baylor College of Medicine.Circulation encourages readers to submit cardiovascular images to the Circulation Editorial Office, St Luke's Episcopal Hospital/Texas Heart Institute, 6720 Bertner Ave, MC1-267, Houston, TX 77030.Download figureDownload PowerPoint Figure 1. A 12-lead ECG obtained at core body temperature of 85°F. Note Osborn waves, an extra deflection at end of QRS complex (arrows).Download figureDownload PowerPoint Figure 2. A 12-lead ECG obtained 24 hours later, after patient had been rewarmed to 98°F, was normal.FootnotesCorrespondence to Imad A. Alhaddad, MD, Division of Cardiology, Department of Medicine, Bronx Lebanon Hospital Center, 1650 Grand Concourse, Bronx, New York, NY 10457. 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