By Daljit Singh Sahota, E Malcolm Symonds, Mang Zing Allan Chang
This quantity summarizes a century of study and useful purposes in foetal electrocardiography. even though foetal ECG is most typically used for the calculation of foetal middle premiums, different parameters were hired within the prediction of foetal acidons. The booklet offers new ways to the translation and research of the foetal ECG sign and discusses attainable new techniques to the medical exploitation of job of the foetal center. The authors have made quite a few contributions to the examine of foetal electrocardiography over the past 3 many years.
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Extra info for Fetal Electrocardiography (Series in Cardiopulmonary Medicine)
Severe acidosis reduces cardiac contractility and this can reduce heart rate and a host of other ECG changes that are discussed in other parts of this book. In addition to responses to pH and blood gas changes, heart rate and myocardial contractility are also affected by changes in the venous return, vagal response to head compression, arousal in response to touch and sound, sleep, and drugs. The many patterns of change in response to combinations of these effects are more effectively dealt with in a book on the CTG, and are beyond the scope of this chapter.
All the mothers eventually delivered normal infants. In some cases, the duration of the tachyarrhythmia was short-lived, but on three occasions, the impulses persisted throughout the entire recording lasting over one hour. The impulses varied at rates between 350-700 pulses/minute but were of low voltage. He pointed out that in three patients, he was able to initiate the signals by having the patients contract their muscles. Historical Development l_J I I I I I I I I 25 I I I I I I I I I L_J t C G recorded at conventional rate of 5 divisions/sec B ~Aj I I I I I I I I I I I Fig.
The changes were basically those seen in the presence of a wandering pacemaker. The literature generally supports the belief that most cardiac arrhythmias are of no clinical significance. However, some abnormalities, particularly those associated with heart block, do have clinical implications. The Use of Abdominal Electrodes Until the 1960s, nearly all studies on fetal electrocardiogram were based on recordings obtained by the use of electrodes placed on the maternal abdomen. The information that was usable was almost entirely based on heart rate or the R-R'interval or the QRS width.