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A 2006 case study looked at the autopsy of a 3 month old female infant who died suddenly after receiving a hexavalent vaccine. After autopsy, damage was observed on the brain stem of the child, specifically the bilateral hypoplasia. (PMID 16231176)

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Bilateral hypoplasia meaning atrophy on both sides due to destruction of some of the elements and not merely to their general reduction in size. More specifically, the brain stem damage was located at the arcuate nucleus.

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The arcuate nucleus is a group of neurons located at the base of the medial plane in the hypothalamus. This cluster of neurons is responsible for regulation of heartbeat. Both pressor and depressor responses can be elicited by the chemical stimulation. (PMID 23260431)

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Also, the the cardiac conduction system presented persistent fetal dispersion and resorptive degeneration. The cardiac conduction system is a group of specialized cardiac muscle cells in the walls of the heart that send signals to the heart muscle causing it to contract.

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Persistent fetal dispersion is defined as islands of conduction tissue separated from the AV node (PMID 9857868).

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