Which of the following is true about the placement of spiral electrodes on the fetus?

The placement of spiral electrodes on the fetus is crucial for obtaining reliable fetal heart rate monitoring. The correct choice indicates that spiral electrodes should be placed on a known presenting part. This ensures that the electrode has a strong connection with the fetal scalp and accurately reflects the fetal heart rate. The presenting part is the part of the fetus that is closest to the cervix in the birth canal, typically the vertex in head-down presentations. By placing the electrode on a known presenting part, healthcare providers can monitor the fetal heart rate more effectively, since the connection is firm and less likely to be lost during contractions or movement.

In fetal monitoring, an appropriate placement is vital to avoid inaccuracies. For example, placing an electrode on an unsuitable area could result in unreliable readings. Therefore, having the electrode on the presenting part promotes accurate assessment of fetal well-being, especially during labor.