For decades, theta rhythms (∼5-10Hz) have been thought to play a critical role in memory processing in the entorhinal-hippocampal network. However, recent evidence suggests that successful memory performance also requires coupling of ∼30-100Hz gamma rhythms to particular phases of the theta cycle. Recent insights imply ways in which theta-gamma coupling may facilitate transfer of information th...

Background/Aim. Neurofeedback (NFB) is a therapeutic method based on monitoring the electroencephalogram (EEG) and providing feedback brain activity of sub-jects. The aim pilot study was to investigate effect lower-beta or sensorimotor rhythm (SMR) (12?15 Hz) NFB training amplitudes latencies late auditory event-related potentials (aERP) components N100, N200, P300 in Go-No go task discriminati...

Aging is an emerging worldwide threat to public health, even in the workplace, as it links with risk of illness and death. Bewildered inflammatory responses and stressful conditions associate with age-related disorders. Additionally, circadian rhythm disruption, a critical health issue in night-shift workers, correlates with premature aging. We investigated the hypothesis of a link between alte...

The rodent hippocampus possesses theta (θ) and beta (β) rhythms, which occur intermittently as bursts. Both rhythms are related to spatial memory processing in a novel environment. θ rhythm is related to spatial memory encoding process. β rhythm is related to the match/mismatch process. In the match/mismatch process, rodent hippocampus detects a representation matching sensory inputs of the cur...

poetic analysis involves the explication of a poem by focusing on the process of semiosis in it. through semiosis linguistic meaning is transformed into stylistic meaning. an examination of semiosis brings us to look at the hypersemanticized poetic structures which are none other than the style features of a poem. since style functions in a literary text by conveying meanings other than literal...

We studied the effects of alpha-adrenergic receptor stimulation and calcium on automaticity of isolated canine Purkinje fibers during simulated ischemia and reperfusion. Ischemia included acidosis (pH 6.7), hypoxia (PO2 = 10-25 mm Hg), hyperkalemia (10 mM K+), and either normal or elevated [Ca2+]o (2.7 or 10.8 mM). Control automatic rate and maximum diastolic potential were 18 +/- 2 beats/min a...

Acute atrial fibrillation (AF) is the most common cardiac rhythm encountered in clinical practice and is commonly seen in acutely ill patients in critical care. In the latter setting, AF may have two main clinical sequelae: (1) haemodynamic instability and (2) thromboembolism. The approach to the management of AF can broadly be divided into a rate control strategy or a rhythm control strategy, ...

In 30 isolated, spontaneously beating right atrial preparations of the rabbit, the arrhythmogenic actions of ouabain were studied with microelectrodes. Ouabain (10(-6) M) uniformly produced the following events: (1) a gradual increase in sinus rate with periods of alternation of beta-to-beat atrial intervals, (2) a rapid rate and regular rhythm, (3) severe irregularity of rhythm, (4) total atri...

We studied whether hemostatic abnormalities contribute to the increased risk of stroke in patients with nonvalvular atrial fibrillation. Hemostatic function was studied in four age-matched groups: 20 patients with nonvalvular atrial fibrillation and a previous ischemic stroke, 20 patients with nonvalvular atrial fibrillation without a previous stroke, 20 stroke patients with sinus rhythm, and 4...

BACKGROUND The burden of cardiovascular disease is expected to escalate in developing countries. However, studies and guidelines concerning atrial fibrillation (AF) are restricted to the developed world. OBJECTIVES To assess the treatment modalities of AF in South Africa. METHODS A cross-sectional, observational, multicentre, national registry of the treatment of 302 patients with AF was co...