ARSci  Vol.3 No.4 , November 2015
Alterations in Heart Rate and Atria to Ventricular Conductivity in Third Trimester Pregnancy: A Comparative Study
Abstract: The cardiovascular system undergoes physiological changes during pregnancy. These physiological changes in the heart can be understood by simple procedures like electrocardiography. With the objective of formulating basis of alterations in heart rate and impulse conductivity from atria to ventricles during pregnancy, the study was carried out in Manipal Teaching Hospital, Pokhara, Nepal between calendar year 2012 and 2013 by comparing electrocardiograms between pregnant and non-pregnant participants. The total number of participants in this study was 120: 50% was third trimester pregnant women as cases and the other 50% was non-pregnant women as controls. The statistically significant increase in heart rate and highly significant decrease in PR interval in electrocardiograms of cases conclude that the alterations in cardiac function do occur in pregnancies which all try to meet the growing demands of developing fetus. Thus, these changes neither should be misinterpreted as of pathological origin nor the latter one if present should be misdiagnosed by any health care providers.
Cite this paper: Chaudhary, S. , Saha, C. and Sarkar, D. (2015) Alterations in Heart Rate and Atria to Ventricular Conductivity in Third Trimester Pregnancy: A Comparative Study. Advances in Reproductive Sciences, 3, 75-80. doi: 10.4236/arsci.2015.34009.

[1]   Bhide, A. (2011) Electrocardiographic Changes in Relation to Body Mass Index and Pregnancy. MD Thesis, Rajiv Gandhi University of Health Sciences, Banglore.

[2]   Hunter, S. and Robson, S.C. (1992) Adaptation of the Maternal Heart in Pregnancy. British Heart Journal, 68, 540-543.

[3]   Muti, G., Scott, N. and Peter, M. (2010) The Electrocardiogram in Pregnancy. Computing in Cardiology, 37, 693-696.

[4]   Landt, H. and Benjamin, J.E. (1936) Cardiodynamic and Electrocardiographic Changes in Normal Pregnancy. American Heart Journal, 12, 592-607.

[5]   Carruth, J.E., Mivis, S.B., Brogan, D.R. and Wenger, N.K. (1981) The Electrocardiogram in Normal Pregnancy. American Heart Journal, 102, 1075-1078.

[6]   Hollander, A.G. and Crawford, J.H. (1943) Roentgenologic and Electrocardiographic Changes in the Normal Heart during Pregnancy. American Heart Journal, 26, 364-376.

[7]   Feldman, L. and Hill, H.H. (1935) The Electrocardiogram of the Normal Heart in Pregnancy. American Heart Journal, 10, 110.

[8]   Konki, V. (1929) The Electrocardiogram of the Heart in Pregnancy and Puerperium. Jap J ObstGynec, 12, 2.

[9]   Katz, R., Karliner, J.S. and Resnik, R. (1978) Effects of a Natural Volume Overload State (Pregnancy) on Left Ventricular Performance in Normal Human Subjects. Circulation, 58, 434-441.

[10]   Carla, A., Oppen, V., Twell, I.V., Robert, M., Bruinse, W.H. and Heethaar, R.M. (1996) A Longitudinal Study of Maternal Hemodynamics during Normal Pregnancy. Journal of Obstetrics and Gynaecology, 88, 40-46.

[11]   Mashini, I.S., Albazzaz, S.J., Fadel, H.E., Abdulla, M.A., Hadi, H.A. and Harp, R. (1987) Serial Non Invasive Evaluation of Cardiovascular Hemodynamics during Pregnancy. American Journal of Obstetrics and Gynecology, 156, 1209- 1213.

[12]   Mone, S.M., Sanders, S.P. and Colan, S.D. (1996) Control Mechanism for Physiological Hypertrophy of Pregnancy. Circulation, 94, 667-671.

[13]   Desai, D.K., Moodley, J. and Naidoo, D.P. (2004) Echocardiographic Assessment of Cardiovascular Dynamics in Normal Pregnancy. Obstetrics and Gynaecology, 104, 20-27.

[14]   Ueland, K., Novy, M.J., Peterson, E.N. and Metcalfe, J. (1969) The Influence of Gestational Age on the Maternal Cardiovascular Response to Posture and Exercise. American Journal of Obstetrics and Gynecology, 104, 856-864.

[15]   Cunningham, G.F., Leveno, K.J., Bloom, S.L., Hauth, J.C., Gilstarp, L.C. and Wenstrom, K.D. (2005) Cardiovascular Disease. William Obstetrics. 22nd Edition, McGraw Hill Publications, New York.

[16]   Stein, P.K., Hagley, M.T., Cole, P.L., Domitrovicn, P.P., Kleigner, R.E. and Rottman, J.N. (1999) Changes in 24 hrs Heart Rate Variability during Normal Pregnancy. American Journal of Obstetrics and Gynecology, 180, 978-985.

[17]   Clap, III, J.F. (1985) Maternal Heart Rate in Pregnancy. American Journal of Obstetrics and Gynecology, 152, 659- 660.

[18]   Julian, D.G. and Wenger, N.K. (2000) Heart Disease and Heart Surgery during Pregnancy. In: Women and Heart Disease, United Kingdom.

[19]   Chia, P., Chia, H. and Subramanian, R. (2002) A Clinical Approach to Heart Disease in Pregnancy Part 1: General Considerations in Management. The Obstetrician and Gynecologist, 4, 162-168.

[20]   Nandini, B. and Shiva, M. (2011) Shortening of PR Interval in Different Trimesters of Pregnancy—A Cross Sectional Study. International Journal of Biomedical and Advance Research, 2, 422-426.