<prompt> Osborne waves in ECG are seen in -HypothyroidismHypothermiaHypocalcemiaHypokalemia  <response>: Ans. is b i.e.? Hypothermia o Osborne waves also called J waves are typically seen in Hypothermia.o J-wave is positive defection l mm seen at the junction of QRS complex and ST segment and present in two consecutive beats. The mean vector axis of the J-wave is oriented anteriorly, inferiorly and leftward across the left ventricle and septum. J-waves are present in 80 of patients with temperature less than 35degC The amplitude of J wave inversely related to the degree of hypothermia.Moderate hypothermia 28X - 32X1 is associated with presence of j waves in inferior and lateral leads increase in PR and QT intevals.Severe hypothermia Additional ECG changes in severe hypotherma 28X may include J waves in all leads absence of P waves and frequent ventricular arryhthmias.o J waves are not pathognomonic of hypothermia as they are also seen in normothennic patients. It is the most specific change seen in hypothermiaCauses of J waves in normothermic individualso Acute ischemic eventso Coccaine useo Haloperidol over useo left ventricular hypertrophyo Hypercalcemiao Brugada s syndromeo CMS injuryo After resuscitation of cardiac arrest. 