Prevalence of maternal tachycardia during late pregnancy

[摘要] ENGLISH ABSTRACT:The importance of maintaining maternal wellbeing during the antenatal period is mandatory to the mother and the baby. Although asymptomatic maternal tachycardia could be seen as part of the physiological changes during pregnancy, it could also be a sign of a serious underlying condition. Previous studies have shown that maternal deaths could occur in women with pre-existing cardiac conditions (Naidoo, Desai & Moodley, 2002:17). The concern that many conditions associated with maternal tachycardia pass through the health care system without being noticed or investigated motivated the researcher to undertake this study.The study aimed to determine the prevalence of maternal tachycardia during late pregnancy and its association with anaemia, major cardiac diseases and/or complications and adverse maternal and perinatal outcomes. A case-control retrospective study design within a prospective study was employed with a quantitative approach. A total sample size of 204 participants, constituting 14.3% of the study population (N=1431) was purposefully selected from the Monica AN24™ recordings of the Safe Passage Study at Tygerberg Hospital to collect the data. Ethical approval was obtained from the Health Research Ethics Committee of the Faculty of Medicine and Health Sciences, Stellenbosch University and a waiver of consent had been granted.A group of 16 participants, who met the inclusion criteria, constituting 7.8% of the total sample, was selected for the pilot study. Reliability and validity was ensured by the pilot study and pre-testing the data collection instrument as it was tested under the exact circumstances as the actual study experts in the field of nursing and medical research and statistics were used. The data was analyzed by the use of the STATISTICA version 9 programme.The results show a 7.1% (n=102) prevalence of maternal tachycardia in late pregnancy. There were no pre-existing cardiac conditions in any of the groups and no maternal cardiac complications during pregnancy and delivery. The case group had a higher incidence (55.0%) of haemoglobin values lower than 11.0 g/dL than the control group (47.0%), however the Mann-Whitney U test revealed no statistically significant difference of the Hb values at 28 to 38 weeks between the case and the control groups. The participants presenting with anaemia (Hb < 11.0 g/dL) were classified as mild anaemia (Hb value of 7.0 – 10.9 g/dL). There were no participants that presented with severe anaemia (Hb value of < 7.0g/dL). There was an increased prevalence (9.1%) of infection in the participants presenting with maternal tachycardia, although this difference was not significant between the two groups. The infant outcome revealed an increased mean birth weight of 194g for the case group that presented with maternal tachycardia.Several recommendations were identified that were grounded in the study findings. The findings reveal that the current antenatal care practice in terms of not recording the maternal heart rate is sufficient.

[发布机构] Stellenbosch University