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After the onset of cardiac arrest, the animals were left untreated for 4\u00a0minutes, after which cardiopulmonary resuscitation was commenced. Heart rhythms were monitored from the onset of asphyxia until return of spontaneous circulation or death.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>After endotracheal tube clamping and prior to cardiac arrest, normal sinus rhythm was noted in 14 animals, atrial fibrillation in two animals, Mobitz <jats:styled-content style=\"fixed-case\">II<\/jats:styled-content> atrioventricular block in 10 animals, and third\u2010degree atrioventricular block in four animals. At the onset of cardiac arrest, seven animals had ventricular fibrillation (<jats:styled-content style=\"fixed-case\">VF<\/jats:styled-content>), two had asystole, and 21 had pulseless electrical activity (<jats:styled-content style=\"fixed-case\">PEA<\/jats:styled-content>). During the 4\u2010minute period of untreated arrest, however, significant changes in the monitored rhythm were noted; at the end of the fourth minute, 19 animals had <jats:styled-content style=\"fixed-case\">VF<\/jats:styled-content>, two animals had asystole, and nine animals had <jats:styled-content style=\"fixed-case\">PEA<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The most common rhythm after 4\u00a0minutes of untreated <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content> was <jats:styled-content style=\"fixed-case\">VF<\/jats:styled-content>, while in 57% of animals, <jats:styled-content style=\"fixed-case\">PEA<\/jats:styled-content> was spontaneously converted to <jats:styled-content style=\"fixed-case\">VF<\/jats:styled-content> during the cardiac arrest 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