Dr Helen Ritchie is a developmental toxicologist with a special interest in the effects of vitamin A, herbal medicine and cardiovascular medicines on the developing embryo and fetus.

Ritchie, H., Oakes, D., Hung, T., Hegedus, E., Sood, S., Webster, W. (2015). The Effect of Dofetilide on the Heart Rate of GD11 and GD13 Rat Embryos, in vivo, Using Ultrasound. Birth Defects Research (Part B), 104(5), 196-203. [More Information] Ritchie, H., Svensson, C., Nilsson, M., Webster, W. (2014). A comparison of drug-induced cardiotoxicity in rat embryos cultured in human serum or protein free media. Journal of Pharmacological and Toxicological Methods, 70(3), 276-282. [More Information] Webster, W., Nilsson, M., Ritchie, H. (2014). Therapeutic Drugs that Slow the Heart Rate of Early Rat Embryos. Is there a Risk for the Human? Current Pharmaceutical Design, 20(34), 5364-5376. Nilsson, M., Ritchie, H., Webster, W. (2013). The effect on rat embryonic heart rate of Na+, K+, and Ca2+ channel blockers, and the human teratogen phenytoin, changes with gestational age. Birth Defects Research (Part B), 98(5), 416-427. [More Information] Ritchie, H., Ababneh, D., Oakes, D., Power, C., Webster, W. (2013). The teratogenic effect of dofetilide during rat limb development and association with drug-induced bradycardia and hypoxia in the embryo. Birth Defects Research (Part B), 98(2), 144-153. [More Information] Ababneh, D., Ritchie, H., Webster, W. (2012). Antidepressants Cause Bradycardia and Heart Block in GD 13 Rat Embryos In Vitro. Birth Defects Research. Part B: Developmental and Reproductive Toxicology, 95(2), 184-193. [More Information] Gunnstrom, M., Ababneh, D., Webster, W., Oakes, D., Ritchie, H. (2012). Antipsychotic drugs cause bradycardia in GD 13 rat embryos in vitro. Reproductive Toxicology, 34(3), 443-450. [More Information] Abela, D., Ritchie, H., Ababneh, D., Gavin, C., Nilsson, M., Khan, M., Carlsson, K., Webster, W. (2010). The effect of drugs with ion channel-blocking activity on the early embryonic rat heart. Birth Defects Research. Part B: Developmental and Reproductive Toxicology, 89(5), 429-440. [More Information] Oakes, D., Ritchie, H., Woodman, P., Narup, E., Moscova, M., Picker, K., Webster, W. (2009). Genotoxicity studies of a desealant solvent mixture, SR-51. Toxicology and Industrial Health: An International Journal, 25(1), 5-13. [More Information] Yao, M., Ritchie, H., Brown-Woodman, P. (2008). A reproductive screening test of hawthorn. Journal of Ethnopharmacology, 118, 127-132. [More Information] Warner, R., Ritchie, H., Woodman, P., Oakes, D., Pourghasem, M. (2008). The effect of prenatal exposure to a repeat high dose of toluene in the fetal rat. Reproductive Toxicology, 26, 267-272. [More Information] Yao, M., Ritchie, H., Woodman, P. (2007). A developmental toxicity-screening test of valerian. Journal of Ethnopharmacology, 113(2), 204-209. [More Information] Yao, M., Ritchie, H., Woodman, P. (2006). A reproductive screening test of feverfew. Is a full reproductive study warranted? Reproductive Toxicology, 22(4), 688-693. [More Information] Yao, M., Ritchie, H., Woodman, P. (2005). A reproductive screening test of goldenseal. Birth Defects Research. Part B: Developmental and Reproductive Toxicology, 74(5), 399-404. [More Information] Woodman, P., Ritchie, H., Korabelnikoff, A., Emmanuel, C. (2004). Replacement Of Ether With Alternate Volatile Anesthetics For Collection Of Rat Serum Used In Embryo Culture. Toxicology in Vitro, 18(5), 719-724. Ritchie, H., Woodman, P., Korabelnikoff, A. (2003). Effect of Co-Administration of Retinoids on Rat Embryo Development In Vitro. Birth Defects Research. Part A: Clinical and Molecular Teratology, 67(6), 444-451. [More Information] Boswell-Ruys, C., Ritchie, H., Woodman, P. (2003). Preliminary screening study of reproductive outcomes after exposure to yarrow in the pregnant rat. Birth Defects Research. Part B: Developmental and Reproductive Toxicology, 68(5), 416-420. [More Information] Oakes, D., Webster, W., Woodman, P., Ritchie, H. (2002). A Study of the Potential for a Herbicide Formulation Containing 2,4-D and Picloram to Cause Male-Mediated Developmental Toxicity in Rats. Toxicological Sciences, 68(1), 200-206. Oakes, D., Webster, W., Woodman, P., Ritchie, H. (2002). Testicular changes induced by chronic exposure to the herbicide formulation, Tordon 75D(R) (2,4-dichlorophenoxyacetic acid and picloram)in rats. Reproductive Toxicology, 16(3), 281-289.