The patient had classic ECG changes of hypothermia (sinus bradycardia, prolonged PR interval, prolonged QT interval, and Osborn waves). These changes occurred in hypothermia resulting from sepsis, without exposure being a factor. Documentation of Osborn waves in this clinical setting supports the theory that they result as a direct consequence of myocardial cooling.

Continuous tape recording of the electrocardiogram was carried out on 25 patients with sinus bradycardia or sinoatrial block. A 72-hour record was made on each fully ambulant patient, by a miniature portable tape recorder and the tapes processed with automatic dysrhythmia detection. A high incidence of slow and fast sinaatrial dysrhythmias was discovered and brief episodes of atrial tachydysrhy...

The electrocardiogram (ECG) characteristics of athletes have recently become a topic of intensive study to accurately identify dangerous and benign alterations in this special population. These subjects develop a high-vagal tone and consequently sinus bradycardia and different degrees of atrioventricular (AV)-block, but it is difficult to determine how much is too much, and the indications for ...

When dilazep was administered intravenously to the anesthetized donor dog, mean systemic blood pressure was dose dependently decreased. At a dose of 0.1 mg/Kg i.v., the mean blood pressure was not changed but a slight decrease in heart rate was usually observed in the donor dog. At the same time, a slight but significant decrease in atrial rate and developed tension of the isolated atrium was i...

Coronavirus disease 2019 varies from asymptomatic to severe acute respiratory syndrome with multiple organ involvement, primarily involving the microvasculature and heart. Acute myocardial injury is most frequently observed reported cardiac complication coronary events, left ventricular systolic dysfunction, arrhythmias, but sinus bradycardia only in a few cases. The development of can be cruci...

Electrophysiological changes produced by intravenous (0.1 mg/kg) metoprolol, a new selective beta 1-blocking agent devoid of intrinsic activity, were studied in 16 subjects with estimated normal impulse formation and conduction. The most important effects were sinus bradycardia, mild increase of sinoatrial conduction time, depression of intranodal conduction, and prolongation of AV node refract...

An ectopic ventricular rhythm (IVR) with a rate of 60 to 100/min was detected in 36 of 100 consecutive patients with acute myocardial infarction by constant monitoring of the electrocardiogram. This mechanism was not apparent clinically and was usually transient, lasting 4 to 30 beats. It was frequently associated with inferior myocardial infarction and usually occurred during sinus bradycardia...

This ECG was recorded from a 93 year old patient with a previously documented third degree AV block and an underlying LBBB. The twelve lead ECG demonstrates sinus bradycardia at a rate of 52 beats per minute, a PR interval of 230 milliseconds, and a left bundle branch block (Figure 1). In figure 2, a rhythm strip of leads V1, II and V5 shows sinus rhythm with AV block. Note that only P waves in...

Acetylcholine causes bradycardia through M2 muscarinic receptors in sinoatrial node cells. I examined with electrocardiogram how the muscarinic K(+) (K(ACh)) channel participates in the sinus bradycardia induced by a muscarinic agonist in the Langendorff preparation of rabbit hearts. In the presence of 100 nM propranolol, 1 nM to 10 microM carbachol (CCh) induced sinus bradycardia in a concentr...