Birth Small Talk

Talking about birth

Listening to the fetus: the history of fetal heart rate monitoring

Pinards fetoscope

Understanding how we arrived at the present point in the history of fetal heart rate monitoring helps to make sense of where we find ourselves. It is worth remembering that the history of what we might call modern maternity care is quite short, and it is still unfolding.

It’s hard to pick a moment in history to know where to start. Women have undoubtably used many ways of knowing their own bodies and the baby inside throughout history. The gendered nature of what is considered important enough to commit to a lasting record means there are few historical traces of this to examine. The history of maternity care is essentially the story of men trying to make sense of women as a mysterious “other” to men. 

There were mentions of listening to sounds within the body as early as the Hippocratic period (460 to 370 BC), but putting the listening ear directly on the body of the person was always a bit of a problem. This was solved by Rene Laennec, a Frenchman (1781 – 1826), who created a simple cone shaped piece of wood, rather like what we know now as a Pinard’s stethoscope. In 1819, Jacque Kergaradec (a student of Laennec) placed a stethoscope on the abdomen of a pregnant woman and wrote “It seemed to me that I was hearing the movements of a watch placed very close to me.” It occurred to Kergaradec that variations in the fetal heartbeat might form the basis of a judgement on the state of health of the fetus. 

It is probably fair to say that this is the moment that fetal heart rate monitoring came into existence. This was the start of a significant shift in the focus of medical knowledge regarding pregnancy and birth. Prior to this point, doctors had no tools to identify with accuracy whether a woman was pregnant, and that the fetus was alive and healthy, so there was little reason to invest time and energy focussing on something you couldn’t measure. (Of course, women had their knowledge about all of this, but this was considered to be unreliable in matters of medicine or the law.)

Within a few years, listening to the fetal heart was introduced to the National Maternity Hospital, in Dublin, Ireland, and by 1833 was described as being in daily use. The main use was to diagnose fetal death, which permitted the use of instruments to remove the fetus in pieces and bring the labour to an end, in the hope of saving the life of the woman. This was during the period when death from birth related sepsis was commonplace and doctors were still reluctant to acknowledge their own role in continuing the epidemic.

Running alongside the story of fetal heart rate monitoring, is the story of the development of safer surgical approaches to end labour – firstly forceps assisted birth, then the caesarean section. This eventually made it possible to achieve the birth of the fetus with an acceptable level of risk for the birthing woman. Safer surgical birth shifted the focus of obstetric knowledge. No longer was the mother the primary patient, and the fetus a secondary concern. The well-being of the fetus became more and more important in obstetrics over time, so that by the mid 20th century, the fetus had become the primary focus.

Categories: CTG, EFM, History

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