نتایج جستجو برای: precordial leads
تعداد نتایج: 243734 فیلتر نتایج به سال:
CURRENT criteria for the electrocardiographic diagnosis of right ventricular hypertrophy -3 depend primarily upon abnormal axis deviation and changes in the right precordial leads (V1, V4.R7). The R/S ratio in these leads has proved to be of great value in the recognition of right ventricular hypertrophy. Various patterns (qR, rS, rsR', Rs) are encountered and many theories have been put forwar...
BACKGROUND Postpacing precordial T-wave inversion (TWI), known as cardiac memory (CM), mimics ischemic precordial TWI, and there are no established ECG criteria that adequately distinguish between the two. On the basis of CM properties (postpacing sinus rhythm T vector approaching the direction of the paced QRS vector), we hypothesized that CM induced by right ventricular pacing would manifest ...
A 57-year-old male was admitted with suspected acute coronary syndrome. He reported experiencing moderate chest pain when walking during the day prior to admission, but had very prominent ST segment elevations in the precordial electrocardiography (EKG) leads. A physical examination revealed remarkable severe kyphoscoliosis with chest deformity. The patient's cardiac troponin levels remained no...
In the present study we investigated the contribution of ventricular repolarization time (RT) dispersion (the maximal difference in RT) and RT gradients (the differences in RT in apicobasal, anteroposterior and interventricular directions) to T-wave flattening in a setting of experimental diabetes mellitus. In 9 healthy and 11 diabetic (alloxan model) open-chest rabbits, we measured RT in ventr...
BACKGROUND Brugada syndrome is recognized as being associated with sudden cardiac death; however, the prevalence of non-type 1 Brugada-type ECG (BrS) or atypical ST-segment elevation in the right precordial leads (STERP) and the long-term prognosis for those patients remain unknown. METHODS AND RESULTS We analyzed standard 12-lead ECGs of 7178 apparently healthy participants (age range 40-64 ...
BACKGROUND In the differential diagnosis of a tachycardia with a wide QRS complex (greater than or equal to 0.12 second) diagnostic mistakes are frequent. Therefore, we investigated the reasons for failure of presently available criteria, and we identified new, simpler criteria and incorporated them in a stepwise approach that provides better sensitivity and specificity for making a correct dia...
CURRENT criteria for the electrocardiographic diagnosis of right ventricular hypertrophy -3 depend primarily upon abnormal axis deviation and changes in the right precordial leads (V1, V4.R7). The R/S ratio in these leads has proved to be of great value in the recognition of right ventricular hypertrophy. Various patterns (qR, rS, rsR', Rs) are encountered and many theories have been put forwar...
The prognostic value of integrated R-wave voltages of precordial leads (V(1)-V(6)) in patients with acute anterior wall ST-elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI) was investigated. Between July 2006 and October 2009, 292 patients with anterior wall STEMI with presentation < 12 hours underwent primary PCI. Thirty-four patients with elec...
Apical hypertrophic cardiomyopathy (HCM) or Yamaguchi syndrome is a relatively rare subtype of HCM characterized by left ventricular apex localization the hypertrophy. In this case, chest pain can be erroneously interpreted as manifestation coronary artery disease. This article presents two cases apical in patients admitted with diagnosis acute syndrome. Electrocardiogram revealed repolarizatio...
Electrophysiological studies showed ventricular tachycardia in five patients (four male, one female) with isolated right ventricular dilatation. All had been asymptomatic before the onset of palpitation which had developed in adolescence or early adult life. Tachycardia had been associated with syncope in four patients, and three had been resuscitated from ventricular fibrillation before invest...
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