Recovery Rate From Category II to Category I EFM Tracings in Pregnant Women Receiving Bolus vs Continuous Intravenous Fluid Administration

The goal of this clinical trial is to learn which method of intravenous fluid works better for treating abnormal fetal heart rate patterns during labour in low-risk pregnant women at term. The main question it aims to answer is: Does a rapid fluid bolus (500 mL given quickly) convert abnormal fetal heart rate tracings to normal within 30 minutes better than slow continuous infusion? Researchers will compare a 500 mL normal saline bolus followed by continuous infusion to continuous infusion alone to see which method improves fetal heart rate patterns faster. Participants will: * Be placed in the left lateral position and receive supplemental oxygen by face mask * Have oxytocin stopped if it is being given * Receive normal saline through an IV line - either as a rapid bolus or a slow continuous drip, depending on which group they are assigned to * Have fetal heart rate monitored continuously and assessed at 30, 60, and 120 minutes * Have blood pressure, heart rate, and oxygen levels checked every 15 minutes * Have two ultrasound measurements taken - one of a vein in the abdomen and one of blood flow in the umbilical cord - at the start and at 30 minutes

NCT Number	NCT07260240
Lead Sponsor	Queen Savang Vadhana Memorial Hospital, Thailand
Conditions	Fetal Non Reassuring
Enrollment	60 participants
Start Date	2025-12-10
Primary Completion	2026-03-27 (estimated)
Study Completion	2026-03-31 (estimated)
Updated on ClinicalTrials.gov	2026-06-10