Estimates of the coexistence of epilepsy and psychogenic nonepileptic seizures vary from 5 percent to more than 60 percent, depending on the study setting and diagnostic criteria.3 Recent studies17, 22 using strict criteria for a diagnosis of epilepsy found that only 5 to 10 percent of patients with non-epileptic seizures have concurrent epileptic seizures.
the contraction, or period of contraction, of the heart, especially of the ventricles, during which blood is forced into the aorta and pulmonary artery. atrial systole. contraction of the atria by which blood is forced into the ventricles; it precedes the true or ventricular systole. extra systole. see extrasystole.
To analyze systole and diastole in more detail, the cardiac cycle is usually divided into seven phases. The first phase begins with the P wave of the electrocardiogram, which represents atrial depolarization, and is the last phase of diastole. Phases 2-4 represent systole, and phases 5-7 represent early and mid-diastole. The last phase of the cardiac cycle ends with the appearance of the next P wave, which begins a new cycle.