Reading electrocardiograms

Interesting electrocardiograms.

The ECG showed normal sinus rhythm at 65 per min., with a very short P-R interval (0.10 sec.). On the fourth beat of the first lead set (simultaneous leads I, II, III), which is marked with an arrow, there is an atrial premature, contraction. This latter beat has a low, rather flat P wave preceding the QRS with a P-R interval of 0.20 sec. The contrast between the sinus beats (with short PR) and...

Electrocardiograms in Acute Pericarditis

The pericardium surrounds the heart and consists of a visceral layer, which is contiguous with the epicardium of the heart, and a parietal layer, which forms a sac around the heart (Wann & Passen, 2008). Located between the parietal and visceral layers is a potential space called the pericardial cavity. The pericardial cavity normally contains as much as 50 mL of an ultrafiltrate of plasma. Ana...

Cancellation of esophageal electrocardiograms.

Cancellation of juxtacardiac esophageal electrocardiograms, as demonstrated in this study, indicates certain limitations of the equivalent cardiac dipole hypothesis. A new and more fundamental theory developed here shows that in large measure cancellation occurs because the cancellation network is in effect a relatively insensitive electrocardiographic connection, and because there is always pr...

Electrocardiograms in young Ceylonese.

The study comprised 196 healthy young adults (100 men, 96 women) between the ages of 20 and 30 years, many ofwhom were university undergraduates and pupil nurses. A full clinical history was followed by a detailed physical examination, and subjects who were not physically healthy were excluded from the study. A 12-lead electrocardiogram was recorded at least 24 hours after the last meal, with n...

Serial electrocardiograms in rheumatic fever.