Increased fetal heart rate variability (FHRV) in intrapartum cardiotocographic recording has been variably defined and poorly understood, limiting its clinical utility. Both preclinical (animal) and clinical (human) evidence support that increased FHRV is observed in the early stage of intrapartum fetal hypoxaemia but can also be observed in a subset of fetuses during the preterminal stage of repeated hypoxaemia. This review of available evidence provides data and expert opinion on the pathophysiology of increased FHRV, its clinical significance and a stepwise approach regarding the management of this pattern, and propose recommendations for standardisation of related terminology.

中文翻译：

---

分娩期间胎心率变异性增加：临床前和临床研究综述

产时胎心监护记录中胎儿心率变异性（FHRV）增加的定义各异且了解甚少，限制了其临床实用性。临床前（动物）和临床（人类）证据都支持，在产时胎儿低氧血症的早期阶段观察到 FHRV 增加，但在反复低氧血症的临终前阶段也可以在部分胎儿中观察到。对现有证据的回顾提供了有关 FHRV 增加的病理生理学、其临床意义以及有关管理该模式的逐步方法的数据和专家意见，并提出了相关术语标准化的建议。