Question: Which is the major symptom of the Doose syndrome?

Context:
KD is particularly effective in myoclonic astatic epilepsy (MAE; Doose Syndrome) and West syndrome with 100% and 81.25% of the patients having a greater than 50% seizure reduction, respectively. 
Myoclonic astatic epilepsy (Doose syndrome) - a lamotrigine responsive epilepsy?
PURPOSE: Myoclonic astatic epilepsy (MAE, Doose syndrome) is a difficult to treat idiopathic generalized epilepsy of early childhood.
Herman Doose first described the generalized childhood epilepsy syndrome of myoclonic astatic epilepsy (MAE) in 1970, attributing a genetic cause from this first description. 
RECENT FINDINGS: In the past several years, neurologists are finding new indications to use these dietary treatments, perhaps even as first-line therapy, including infantile spasms, myoclonic-astatic epilepsy (Doose syndrome), Dravet syndrome, and status epilepticus (including FIRES syndrome).
First long-term experience with the orphan drug rufinamide in children with myoclonic-astatic epilepsy (Doose syndrome).
INTRODUCTION: We evaluated the long-term efficacy and tolerability of the orphan drug rufinamide (RUF) in children with pharmacoresistant myoclonic-astatic epilepsy (MAE, Doose syndrome).
Mutations in SCN1A gene, encoding the voltage-gated sodium channel α1-subunit, are found to be associated with severe myoclonic epilepsy in infancy or Dravet syndrome (DS), but only rarely with the myoclonic astatic epilepsy (MAE, or Doose syndrome). 
The difficulty early in the course of Lennox-Gastaut syndrome is distinguishing this diagnosis from severe myoclonic epilepsy of infancy (Dravet syndrome) or from myoclonic-astatic epilepsy (Doose syndrome), as the seizure patterns in these three syndromes may overlap at the onset. 
Doose syndrome (myoclonic-astatic epilepsy): 40 years of progress.
Doose syndrome, otherwise traditionally known as myoclonic-astatic epilepsy, was first described as a unique epilepsy syndrome by Dr Hermann Doose in 1970.
Of 38 patients, 22 had Lennox-Gastaut syndrome (58%); 6 had myoclonic-astatic epilepsy of Doose (16%); 5 had symptomatic generalized epilepsy, not otherwise specified (13%); and 5 had symptomatic localization-related epilepsy (13%). 
With felbamate treatment, 6 patients (16%) became seizure free, including 4 of the 6 patients with myoclonic-astatic epilepsy of Doose; 24 patients (63%) had a greater than 50% reduction in seizure frequency.
Less commonly observed phenotypes include myoclonic-astatic epilepsy (MAE or Doose syndrome), Lennox-Gastaut syndrome (LGS), infantile spasms, and vaccine-related encephalopathy and seizures.
This includes syndromes with multiple etiologies, including Lennox-Gastaut syndrome and infantile spasms; developmental syndromes of unknown etiology, such as Landau-Kleffner syndrome; and idiopathic epilepsies, such as myoclonic-astatic (Doose) epilepsy. 
It should be considered early in the treatment of Dravet syndrome and myoclonic-astatic epilepsy (Doose syndrome). 
The purpose of this article is to present a short review of the natural history of myoclonic astatic epilepsy (MAE; Doose syndrome) and the Lennox-Gastaut syndrome (LGS). 
[Clinical case of the month. Myoclonic-astatic epilepsy in a young child (MAE) or Doose syndrome].
His refractory epilepsy which started 7 years ago shares symptoms and signs of both epilepsy with myoclonic-astatic seizures (Doose Syndrome) and Lennox-Gastaut Syndrome.
PURPOSE: Before 1986, the spectrum of childhood epilepsies, including Lennox-Gastaut syndrome (LGS) and Doose syndrome (DS), known collectively as "epilepsia myoclonica astatica," was believed to represent a single disease. 
We reported a 7-year-old girl with myoclonic-astatic epilepsy of early childhood (Doose syndrome). 
Other myoclonic epilepsy syndromes with onset in the first year of life (Aicardi's Neonatal (Early) Myoclonic Encephalopathy, West's Syndrome, Dravet's Severe Myoclonic Epilepsy, and Dravet's Benign Myoclonic Epilepsy of Infancy), in early childhood (Lennox-Gastaut-Dravet Syndrome, Myoclonic Variant of Lennox Gastaut Dravet Syndrome, Myoclonic-Astatic Epilepsy of Doose, Benign Myoclonic Epilepsies (BME), or even in late childhood (Childhood Absence Epilepsy with myoclonias, vs. Myoclonic Absence Epilepsy) are probably genetically complex diseases. 
A study of epileptic drop attacks (EDA) by simultaneous video-polygraphic recordings was carried out in one epileptic patient with myoclonic astatic seizures (Doose syndrome). 
A number of variants or atypical forms have been proposed. As a result, differential diagnosis presents a major challenge and includes specific generalized epilepsies, i.e., metabolic or inflammatory; secondarily generalized epilepsies, i.e., those arising from the frontal lobe; and severe forms of idiopathic generalized epilepsy, i.e., Doose syndrome.
Video-EEG analysis of drop seizures in myoclonic astatic epilepsy of early childhood (Doose syndrome).
 The clinical and EEG pattern, the high familial incidence are shared by the Doose syndrome, of which the present series seems to be a subgroup, as are other well-defined syndromes: benign and severe myoclonic epilepsies of infancy.
The difficulty early in the course of Lennox-Gastaut syndrome is distinguishing this diagnosis from severe myoclonic epilepsy of infancy (Dravet syndrome) or from myoclonic-astatic epilepsy (Doose syndrome), as the seizure patterns in these three syndromes may overlap at the onset.
The difficulty early in the course of Lennox-Gastaut syndrome is distinguishing this diagnosis from severe myoclonic epilepsy of infancy (Dravet syndrome) or from myoclonic-astatic epilepsy (Doose syndrome), as the seizure patterns in these three syndromes may overlap at the onset
His refractory epilepsy which started 7 years ago shares symptoms and signs of both epilepsy with myoclonic-astatic seizures (Doose Syndrome) and Lennox-Gastaut Syndrome
Doose syndrome, otherwise traditionally known as myoclonic-astatic epilepsy, was first described as a unique epilepsy syndrome by Dr Hermann Doose in 1970

Answer: Myoclonic astatic epilepsy is the major symptom of the Doose syndrome, which is a difficult to treat idiopathic generalized epilepsy of early childhood.
Exact answer: myoclonic astatic epilepsy