The most common explanation for fetal tachycardia is -
Fetal tachycardia is defined as a baseline hea rate greater than 160 bpm. The most common explanation for fetal tachycardia is maternal fever from chorioamnionitis, although fever from any source can increase baseline fetal hea rate. Other causes of fetal tachycardia include fetal compromise, cardiac arrhythmias, and maternal administration of parasympathetic(atropine) or sympathomimetic (terbutaline) drugs.
Maternal administration of parasympathetic or sympathomimetic drugs
Maternal fever from amnionitis
Fetal cardiac defects
Cardiac arrhythmias
Intra Uterine Growth Restriction, Intrapaum and Antepaum Fetal Surviellance