Tall R waves in lead V1 present the life insurance company medical director with a diagnostic dilemma. This ECG pattern may be present in applicants with right bundle branch block, right ventricular hypertrophy, Wolff-Parkinson-White syndrome, posterior myocardial infarction, hypertrophic cardiomyopathy, muscular dystrophy, dextrocardia, misplaced precordial leads, as well as in normal individu...

We report a case of cerebral arteriovenous malformation in a 34 year-old male patient presenting with chest pain. Electrocardiographic findings showed ST elevations in the precordial leads. However, a coronary angiogram showed no coronary lesions. Laboratory tests suggested that troponin and cardiac enzymes were within normal limits. Further investigation led to the diagnosis of a cerebral arte...

The cause and associated pathophysiology of precordial ST-segment depression (ST decreases) during acute inferior myocardial infarction (IMI) are controversial. To investigate this problem, electrocardiographic findings in 48 consecutive patients with acute IMI were prospectively compared with results of coronary angiography, submaximal exercise thallium-201 (201TI) scintigraphy and multigated ...

Brugada Syndrome is a genetic cardiac disease characterized by electrocardiogram changes consisting of an incomplete right bundle branch block, and ST-segment elevations in right precordial leads V1-V3. These patients are at high risk for developing spontaneous arrhythmias that can be fatal. Many factors during general anesthesia, such as medications, temperature changes, and heart rate variati...

A 67-year-old male patient was admitted with an abrupt sudden cardiac death. He represented with an extreme electrical storm of 30 times of ventricular fibrillation (VF) episodes on one day. External shocks were performed to terminate VF. Transient J-wave in the inferior-lateral leads and Brugada electrocardiography pattern on the right precordial leads appeared during the electrical storm. And...

Acute myocardial infarction was precipitated by hyperventilation in a 65 year old man. His coronary arteriogram in the chronic phase showed almost normal coronary arteries. Injection of acetylcholine (50 micrograms) into the left coronary artery induced spasm of the circumflex artery with chest pain in association with ST-segment elevation in the inferior leads and ST-segment depression in the ...

The extremity and circumferential chest lead electrocardiogram (twenty-two leads) was studied in 8 patients with generalized coronary insufficiency induced by exercise. Over the right chest, posteriorly and laterally, there was noted RS-T elevation similar to but less pronounced than that occurring in lead aVR. These leads plrobably represent true or mixed cavity potentials. Standard leads reve...

Adequate unipolar electrocardiograms have been recorded on 101 patients with congenital heart disease and the findings analyzed. It has been found that the chief value of such tracings rests in the determination of ventricular preponderance, the evidence being obtained from study of the QRS complexes in unipolar limb and multiple precordial leads, with relatively little help from the RS-T segme...