A 31-year-old woman presented with chest discomfort in the 22nd week of pregnancy. She had been treated with an intravenous infusion of ritodrine hydrochloride (0.25 mg/min) for preterm labor the prior day. On physical examination, the body temperature was 36.3°C, the blood pressure was 117/68 mmHg, the pulse was 96 beats/min, and the respiratory rate was 20 breaths/min. Electrocardiography (EC...

The traditional approach to the ECG diagnosis of left ventricular hypertrophy (LVH) is focused on the best estimation of left ventricular mass (LVM) i.e. finding ECG criteria that agree with LVM as detected by imaging. However, it has been consistently reported that the magnitude of agreement is rather low as reflected in the low sensitivity of ECG criteria. As a result, the majority of cases w...

BACKGROUND The value of the 12-lead electrocardiogram (ECG) to provide prognostic information in the deadly and disabling syndrome peripartum cardiomyopathy (PPCM) is unknown. AIMS To determine the prevalence of major and minor ECG abnormalities in PPCM patients at the time of diagnosis, and to establish whether there are ECG correlates of persistent left ventricular dysfunction and/or clinic...

Thallium-201 scintigraphy was performed during the pain free period in 98 patients with unstable angina. Scintiscans were positive in 39 patients, questionable in 27 patients and normal in 32 patients. Eighty-one patients responded favorably to treatment (group I). Seventeen patients had complicated courses (group II) and despite maximal treatment with propranolol either developed infarction (s...

There is paucity of information on the diurnal variation in electrocardiogram (ECG) parameters of normal individuals, especially those subjected to physical exertion. The aim of the study was to determine changes in patterns of ECG intervals of normal young adults with variations in hours of the day, and to compare the changes between athletes and non-athletes. The study investigated resting EC...

The signal strength of the maternal ECG (MECG) is usually many times that of the fetal ECG (FECG). Separating FECG from abdominal ECG (AECG) is therefore always a challenge. Some multiple-lead algorithms use the thoracic MECG to cancel the MECG in the AECG to get FECG, though this is inconvenient for the patient during long-term monitoring. Hence, this paper describes an adaptive method to sepa...

There is increasing evidence that regular intense endurance exercise can promote structural and electrical remodeling of the right ventricle (RV). These physiological changes can be profound and are frequently accompanied by ECG changes in the right precordial leads, thereby mimicking features observed in arrhythmogenic right ventricular cardiomyopathy (ARVC). Because the 12-lead ECG is used as...

Basic cardiac electrophysiology is foundational to understanding normal cardiac function in terms of rate and rhythm and initiation of cardiac muscle contraction. The primary clinical tool for assessing cardiac electrical events is the electrocardiogram (ECG), which provides global and regional information on rate, rhythm, and electrical conduction as well as changes in electrical activity asso...

Research into the application of electrocardiography in buffaloes has been lacking when compared to other species. However, identification of altered health states, whether for identification of healthy animals or for the measurement of treatment effects is vital for research. Several electrocardiogram (ECG) changes were shown to occur in buffaloes naturally infected with Theileria annulata inc...

Background: Slow coronary flow (SCF) is defined as a condition in which in spite of no evidence of coronary occlusion or stenosis in angiography, there is delayed pacification of the vessels after the injection of a contrast agent. There are several studies about electrocardiogram (ECG) changes in these patients, but changes like OLD MI, RBBB, LBBB, LVH and ST-T wave have not b...