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("ECG" OR "EKG") AND ("Osborne Wave")

Gregory Scott Troutman, Jason Salamon, Matthew Scharf, Jeremy A Mazurek
Osborn waves, or J waves, initially described by John Osborn in 1953 in hypothermic dog experiments, are highly sensitive and specific for hypothermia. Initially thought to be secondary to a hypothermia-induced "injury current," they have more recently been attributed to a voltage differential between epicardial and endocardial potassium (Ito ) currents. While the exact conditions required to induce such waves have been debated, numerous clinical scenarios of environmental and iatrogenic hypothermia have been described...
2019: Case Reports in Cardiology
Oguz Eroglu, Sancar Serbest, Tarkan Kufeciler, Asim Kalkan
BACKGROUND & AIM: The aim of this study was to compare hypothermia patients with and without an Osborn wave (OW) in terms of physical examination findings, laboratory results, and clinical survival. METHODS: The study was carried out retrospectively on hypothermic patients. The hypothermic patients were divided into two groups. Group 1 comprised patients with OW on electrocardiogram (ECG), and Group 2 comprised patients without OW on ECG. The Mann-Whitney U test was used to compare the two groups, and the relationships between the variables and the presence of OW and mortality were analyzed with ANOVA...
August 19, 2018: American Journal of Emergency Medicine
Edina Hadziselimovic, Jakob Hartvig Thomsen, Jesper Kjaergaard, Lars Køber, Claus Graff, Steen Pehrson, Niklas Nielsen, David Erlinge, Martin Frydland, Sebastian Wiberg, Christian Hassager
BACKGROUND: The Osborn or J-wave, an upright deflection of the J-point on the electrocardiogram (ECG), is often observed during severe hypothermia. A possible relation between Osborn waves (OW) and increased risk of ventricular arrhythmia has been reported. We sought to determine whether the level of targeted temperature management (TTM) following out-of-hospital cardiac arrest (OHCA) affects the prevalence of OW and to assess the associations between OW and risk of ventricular arrhythmia and death...
July 2018: Resuscitation
Panagiotis Mililis, George Bazoukis, Athanasios Bakalakos, Konstantinos P Letsas
Prominent J-waves are observed in several clinical conditions many of which are highly arrhythmogenic and may lead to ventricular fibrillation (VF) and/or sudden cardiac death. We present the case of a 34-year-old male patient with hypothermia. Prominent J-waves (Osborn waves) and prolonged QT interval was evident in nearly every lead. Early recognition of these arrhythmogenic electrocardiogram (ECG) findings and treatment of hypothermia is important to minimize the risk of arrhythmic events.
January 2018: Journal of Thoracic Disease
G Michels, S Ney, F Hoffmann, J Brugada, R Pfister, K Brockmeier, A Sultan
Hypothermia-induced J‑ or so-called Osborn waves can be detected under therapeutic hypothermia in approximately 20-40% of cases. The occurrence of J‑waves in the context of the targeted temperature management after cardiopulmonary resuscitation is characteristic, but not pathognomonic for hypothermia. An electrocardiographic diagnosis under hypothermia after cardiac arrest should always be done with caution due to the various hypothermia-associated electromechanical changes of the myocardium.
April 2018: Medizinische Klinik, Intensivmedizin und Notfallmedizin
Murat Yalçın, Mustafa Aparcı, Murat Eroğlu, Zafer Işılak, Namık Özmen
BACKGROUND: Osborn wave, typically associated with hypothermia, is currently referred to as one of the J wave syndromes due to its clinical potential to develop lethal cardiac arrhythmia; it may rarely be observed in a non-hypothermic setting such as cannabis abuse. CASE REPORT: In this paper, we presented two young cases who presented to the emergency services with unconsciousness, drowsiness, and hypoxia, and also J wave on electrocardiography (ECG) due to Bonsai abuse...
January 2017: Balkan Medical Journal
Itsuro Kazama
By simply adding a high concentration of calcium solution to the surface of the bullfrog heart, we reproduced electrocardiogram (ECG) abnormalities representing those observed in hypercalcemia, such as Osborn waves and shortening of the QT interval. The rise in extracellular calcium concentration may have activated the outward potassium currents during phase 3 of the action potential, and thus decreased its duration. In addition to the known decrease in the duration of phase 2, such changes in phase 3 were also likely to contribute to the shortening of the QT interval...
January 20, 2017: Journal of Veterinary Medical Science
Sabiye Yilmaz, Mehmet Akif Cakar, Mehmet Bulent Vatan, Harun Kilic, Nurgul Keser
Drowning is one of the fatal accidents frequently encountered during the summer and is the most common cause of accidental death in the world. Anoxia, hypothermia, and metabolic acidosis are mainly responsible for morbidty. Cardiovascular effects may occur secondary to hypoxia and hypothermia. Atrial fibrillation, sinus dysrhythmias (rarely requiring treatment), and, in serious cases, ventricular fibrillation or asystole may develop, showing as rhythm problems on electrocardiogram and Osborn wave can be seen, especially during hypothermia...
March 2014: Turkish Journal of Emergency Medicine
R Evertz, K R Ramachandran, J P R Herrman, L R van der Wieken
Hypothermia can cause several ECG changes which can be mistaken for other cardiac diseases, most importantly acute transmural ischaemia. These ECG changes correlate strongly with the degree of hypothermia and the prognosis of the patient. This brief report presents a 32-year-old male who was seen after a drowning accident. After resuscitation a 12-lead electrocardiogram showed changes typical for hypothermia: atrial fibrillation and Osborn waves. The ECG of the patient normalised after rewarming.
December 2005: Netherlands Heart Journal
Małgorzata Dzięcioł, Michał Kacprzak, Beata Goleniewska, Marzenna Zielińska
OBJECTIVE: Experimental and clinical studies have proven the neuroprotective effects of hypothermia in unconscious patients with spontaneous circulation after out-of-hospital cardiac arrest. Based on this evidence, recommendations have been made to incorporate mild therapeutic hypothermia into practice. ECG changes are well documented in people with incidental hypothermia but there are only few studies on ECG abnormalities in patients undergoing mild therapeutic hypothermia after cardiac arrest due to ST-elevation myocardial infarction...
October 2014: Acta Cardiologica
Yassar Nabeel, Omair Ali
We present an interesting case of a 49-year-old woman with hypothermia and associated Osborn waves (also called J waves) on ECG. She was found on the floor of her home and difficult to arouse. On arrival to the emergency department (ED), her rectal temperature was 87.5°F. ECG showed Osborn waves in diffuse leads. She was intubated in the ED and was started on vasopressor support for hypotension refractory to intravenous fluid boluses. She was transferred to the critical care unit for continued respiratory and cardiovascular support...
November 18, 2014: BMJ Case Reports
Hesham R Omar, Enrico M Camporesi
INTRODUCTION: Several reports illustrate an inverse correlation between the Osborn wave (J wave) amplitude and core body temperature. We attempted to study the strength of this correlation. METHODS: We reviewed all articles reporting hypothermic J waves from 1950-2014 for patient demographics, core body temperature in Celsius (°C), amplitude of the J wave in millimeters (mm), lead with the highest amplitude of J wave, presence of acidosis, PO2, electrolytes and outcome...
August 2015: European Heart Journal. Acute Cardiovascular Care
Lovely Chhabra, Ramprakash Devadoss, Besiana Liti, David H Spodick
Hypothermia is a common environmental emergency encountered by physicians and is associated with a variety of electrocardiographic (ECG) abnormalities. The classic and well-known ECG manifestations of hypothermia include the presence of J (Osborn) waves, interval (PR, QRS, QT) prolongation, and atrial and ventricular arrhythmias. There are less well defined and known ECG signs of hypothermia, which in fact may simulate findings of acute coronary ischemia, Brugada syndrome, or even pericarditis. Although classical ECG changes seen in hypothermia certainly serve as an important clinical clue for prompt identification and management of this easily curable life-threatening entity, physicians should, however, be able to maintain a high suspicion for recognition and differentiation of less common ECG abnormalities encountered in hypothermia...
June 2013: Therapeutic Hypothermia and Temperature Management
Ewelina Kowalczyk, Jarołsaw D Kasprzak, Piotr Lipiec
We describe a patient with severe hypothermia, in whom the electrocardiogram showed giant J-waves, also known as Osborn waves, distinguishable in the inferior and anterolateral leads. Moreover, a Brugada-like pattern was also visible in leads V2 and V3. The presented case and ECG findings may contribute to the discussion about the pathophysiologic mechanism underlying Brugada syndrome and giant J-wave.
February 2014: Acta Cardiologica
A Schober, F Sterz, C Handler, I Kürkciyan, A Laggner, M Röggla, M Schwameis, C Wallmueller, C Testori
BACKGROUND: Accidental hypothermic cardiac arrest is associated with unfortunate prognosis and large studies are rare. We therefore have performed an outcome analysis in patients that were admitted to Vienna University Hospital with the diagnosis of accidental hypothermic cardiac arrest. METHODS: This study employed a retrospective outcome analysis of prospectively collected data in a selected cohort of hypothermic cardiac arrest patients. We screened 3800 cardiac arrest patients, treated at our department between 1991 and 2010, for eligibility...
June 2014: Resuscitation
Erik O'Connell, Nevin Baker, Gopi Dandamudi, Steven Steinhubl
THIS CASE REPORT EXPOSES A PHENOMENON WHICH, ALTHOUGH PROPOSED, HAS NOT BEEN DESCRIBED IN CLINICAL LITERATURE: transient postictal hemiplegia (Todd's paralysis) with concomitant electrocardiographic J-point deflection (Osborn waves). Although typically associated with hypothermia, a prominent J-wave on the electrocardiogram (ECG) results from a transmyocardial voltage gradient during ventricular repolarization. Rarely, the Osborn wave may be observed in a non-hypothermic setting such as hypercalcemia or cerebral hemorrhage...
January 2013: Case Reports in Neurology
Filip M Szymański, Grzegorz Karpiński, Anna E Płatek, Grzegorz Opolski
A 37 year-old male patient was admitted to the intensive care unit after an out-of-hospital cardiac arrest due to ventricular fibrillation in a course of ST-segment elevation acute coronary syndrome. On admission, the patient was unconscious with a Glasgow Coma Scale (GCS) score of 5. A percutaneous coronary intervention and mild therapeutic hypothermia (HT), defined as maintaining body temperature between 32°C and 34°C, were performed. During HT on ECG, we observed Osborn waves, which resolved spontaneously after re-warming...
2013: Kardiologia Polska
Corina L Rolfast, Erik J Lust, Carel C de Cock
INTRODUCTION: During therapeutic hypothermia (TH), electrocardiographic (ECG) abnormalities such as Osborn waves and/or ST-segment elevation have been described. However, the incidence and prognostic value of these ECG changes are uncertain given the small-scale studies that have been carried out to date. The aim of this study is to further evaluate the electrocardiographic changes during TH. METHODS: During a period of 3 years, 81 patients (age 63 ± 14 years) were included retrospectively...
2012: Critical Care: the Official Journal of the Critical Care Forum
Lovely Chhabra, David H Spodick
Hypothermia is one of the most common environmental emergencies encountered by physicians that can be associated with a variety of electrocardiographic (ECG) abnormalities. The classic and well-known ECG manifestations of hypothermia include the presence of J (Osborne) waves, interval (PR, QRS, QT) prolongation, varied T-wave abnormalities, and atrial and ventricular arrhythmias. There are less well-defined and known ECG signs of hypothermia that, in fact, may simulate findings of acute coronary ischemia. We describe a case of hypothermia with associated ECG findings mimicking pericarditis...
July 2012: Journal of Electrocardiology
T Sentürk, C Ozbek, D Tolga, A R Kazazoğlu
The J wave, also known as Osborn wave, is a deflection that can be observed on the surface ECG as a late delta wave, seen at the end of the QRS complex. In this case, a 75-year-old woman, after 1 day of continuous haemodialysis, showed a marked hypothermia (28.5°C) and severe hypokalaemia (1.7 mEq/l). Bradycardia was seen on the monitor and J waves were recognised on the ECG recording. After appropriate replacement of potassium and treatment of hypothermia, the J waves disappeared spontaneously.
February 2013: Netherlands Heart Journal
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