Conclusions the characteristic of SDS are paroxysmal syncope and orthostatic hypotension, which is related to the deficiency of adrenergic neuron closely.

结论发作性晕厥与直立位低血压是SDS的特点，肾上腺素能神经元缺失与此密切相关。

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Conclusion 1. TH mRNA and TH appearing in same intrinsic cardiac ganglionic neuron demonstrate that a part of intrinsic cardiac ganglionic neurons are possibly adrenergic sympathetic neurons;

结论1证明部分心内神经节的细胞内既出现TH的基因表达 ，同时又有TH ，可能是肾上腺素能的交感神经细胞 ；

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Conclusion 1. TH mRNA and TH appearing in same intrinsic cardiac ganglionic neuron demonstrate that a part of intrinsic cardiac ganglionic neurons are possibly adrenergic sympathetic neurons;

结论1证明部分心内神经节的细胞内既出现TH的基因表达 ，同时又有TH ，可能是肾上腺素能的交感神经细胞 ；

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