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Ictal laughter associated with paroxysmal hypothalamopituitary dysfunction

S Arroyo¹, J Santamaría, F Sanmartí

¹Servicio de Neurología, Hospital Clinic i Provincial de Barcelona, Spain.

|January 1, 1997

Summary

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Gelastic seizures originating from hypothalamic hamartomas cause brain hyperperfusion and hormonal surges. These findings suggest the hypothalamus generates these seizures, impacting the hypothalamopituitary axis.

Area of Science:

Neurology
Pediatric Endocrinology

Background:

Gelastic seizures, characterized by ictal laughter, are often linked to hypothalamic hamartomas and precocious puberty.
The precise origin of these seizures within the brain remains unclear.

Observation:

A case study detailing a child with gelastic seizures and a hypothalamic lesion (likely a hamartoma).
Two distinct phenomena were observed during seizures: hypothalamopituitary hyperperfusion and a surge in specific hormones.

Findings:

Ictal single photon-emission computed tomography (SPECT) using [99m]Tc hexamethyl-propyleneamine oxime (HM-PAO) revealed hyperperfusion in the hypothalamopituitary regions.
Hormonal analysis during a seizure showed elevated levels of gonadotropins, 17 beta-estradiol, and growth hormone.

Related Experiment Videos

Implications:

The hypothalamus or adjacent brain regions are suggested as the origin of gelastic seizures associated with hypothalamic hamartomas.
These seizures may induce temporary dysfunction of the hypothalamopituitary axis.