Related Experiment Video
Updated: Jun 20, 2026
Instrumentation of Near-term Fetal Sheep for Multivariate Chronic Non-anesthetized Recordings
Published on: October 25, 2015
Acute behavioral effects of intrapleural OK-432 (Picibanil) administration in preterm fetal sheep
Rosalind V Cowie1, Peter R Stone, Emma Parry
1Department of Physiology, University of Auckland, Auckland 1023, New Zealand.
Objective:
To develop a model to study the fetal effects of intrapleural infusion of OK-432 (Picibanil), a pleurodesis agent derived from killed Gram-positive streptococci.
Methods:
OK-432 (0.1 mg, n = 5), or normal saline (n = 5) were infused over 20 min into the pleural space of chronically instrumented preterm fetal sheep at 0.7 gestation. Fetal physiological parameters, including breathing and nuchal activity were monitored in utero from 6 h before infusion until 12 h afterward, and fetuses were killed after 7 days recovery.
Results:
OK-432 was associated with transient suppression of fetal EEG activity, breathing and body movements from 3-6 h after infusion. Hypotension and hypoxia did not occur. At postmortem, local pleural adhesions were seen around the site of OK-432 infusion but not in saline treated fetuses.
Conclusions:
Intrapleural administration of OK-432 is associated with marked but transient fetal behavioral effects. This model will enable preclinical investigation of the neural and cardiovascular safety of OK-432 at a clinical relevant stage of development.
