Timing and Outcomes of an Indication-Only Use of Intravenous Cannulation During Spontaneous Labor.

Introduction: In the United States, most women presenting in spontaneous labor undergo intravenous (IV) cannulation on admission to hospital labor and birth units. There is limited evidence for this routine practice in pregnant women at low risk for adverse outcomes during labor or birth.

Methods: A retrospective, exploratory, descriptive study of an indication-only practice of IV cannulation on admission for women presenting in spontaneous labor and cared for by a nurse-midwife service was performed. Descriptive data included the timing of IV cannula placement (admission, during labor or postpartum period, or not at all) and indications for placement. Maternal outcomes of interest were estimated blood loss, postpartum hemorrhage rates, and management; neonatal outcome was 5-minute Apgar scores.

Results: Records for 1069 women cared for by nurse-midwives who presented in spontaneous labor were reviewed. In this cohort, 445 (41.6%) had IV access established on admission, 325 (30.4%) had an IV cannula placed during labor or postpartum, and 299 (28%) never had IV access during their hospital stay. For the 325 women with IV cannulas placed after admission, 25 (7.7%) were placed urgently for excessive postpartum bleeding. Further analysis of the subset of women who had a postpartum hemorrhage after vaginal birth (defined as >500 mL estimated blood loss) indicated that urgent IV cannulation was not associated with a lower mean postpartum hemoglobin or hematocrit or an increase in blood transfusion rate when compared with women who had an IV cannula placed earlier in their labor course.

Discussion: Indication-only IV cannulation for women experiencing an uncomplicated labor and birth is a reasonable practice in settings where IV access can be established urgently if needed.