. Epilepsy, a study of the idiopathic disease. or type in - - 60 per cent. The combined type in - - 32 „ The minor type in - - 55 „ From these two series of figures it is obvious that thecommonest clinical variety of the disease is the major type,characterised by the recurrence of convulsive seizures; thatthe minor variety, indicated by the type of seizure alreadydescribed, is a relatively rare clinical manifestation, but thatwhen the two types of fit are combined to form the clinicalpicture a frequent group of epilepsies is noted. {a) Clinical groupings based upon the character of the seizure


. Epilepsy, a study of the idiopathic disease. or type in - - 60 per cent. The combined type in - - 32 „ The minor type in - - 55 „ From these two series of figures it is obvious that thecommonest clinical variety of the disease is the major type,characterised by the recurrence of convulsive seizures; thatthe minor variety, indicated by the type of seizure alreadydescribed, is a relatively rare clinical manifestation, but thatwhen the two types of fit are combined to form the clinicalpicture a frequent group of epilepsies is noted. {a) Clinical groupings based upon the character of the seizures. 1. The Major Type. This variety of the disease is characterised by the recur-rence of convulsive seizures varying in frequency from one ortwo, or less, up to twenty or more per month. They mayoccur either by day or by night, or during both the wakingand the sleeping hours. Many cases of this type, as indeed most forms of epilepsy,. CHART 1. An Average Type of Major Epilepsy. JAN. FEB. MAR. APRIL MAY JUNE JULY AUG. SEP, OCT. NOV. page Etiin THE MAJOR TYPE 95 present a peculiar constancy in the incidence of the many years there is little or no change in the monthlyor yearly total. An average weekly, monthly, or yearlyfrequency having been established early in the course of thedisease, little variation takes place, so that charts, noting theincidence of the fits for many years, show a striking the other hand, there are cases in which the frequencyof the seizures increases as time goes on; but there is rarelyany sudden change in a well-established type, unless therearises a complication, such as a serial outburst, or the develop-ment of status epilepticus. The fits may occur singly, or in little groups of two orthree; there is no regular periodicity in their incidence,although there is a tendency for the attacks to supervene atfairly regular intervals. In women, at the commencement ofthe disease, the tendency is towards their


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