What are the 3 major decelerations?

What are the 3 major decelerations?

There are three basic types of decelerations: early decelerations, late decelerations, and variable decelerations. Early decelerations are generally normal and not concerning. Late and variable decelerations can sometimes be a sign the baby isn’t doing well.

What is deceleration in midwifery?

Definition. Late deceleration is defined as a visually apparent, gradual decrease in the fetal heart rate typically following the uterine contraction. The gradual decrease is defined as, from onset to nadir taking 30 seconds or more.

What constitutes a deceleration?

A gradual* decrease and return to baseline of the FHR associated with a uterine contraction. The deceleration is delayed in timing, with the nadir of the deceleration occurring after the peak of the contraction.

What causes early decelerations?

Early decelerations are caused by fetal head compression during uterine contraction, resulting in vagal stimulation and slowing of the heart rate.

What do fetal decelerations mean?

Decelerations are temporary decreases in the fetal heart rate (FHR) during labor. Hon and Quilligan first described three types of decelerations (early, variable, and late) in 1967 based on the shape and timing of decelerations relative to uterine contractions.

What is deceleration give an example?

We know that acceleration means the rate at which an object speeds up, that means deceleration means the rate at which an object slows down. For example, when we are using brake during driving, we are taking benefits of deceleration to reduce the speed of the vehicle.

Is variable deceleration reassuring?

15 The presence of accelerations is considered a reassuring sign of fetal well-being. An acceleration pattern preceding or following a variable deceleration (the “shoulders” of the deceleration) is seen only when the fetus is not hypoxic.

How are complicated variable decelerations defined in the CTG?

Complicated variable decelerations are defined by their features as well as the other features of the CTG. These additional features indicate the likelihood of fetal hypoxia and the definition includes one or more of the following: Rising baseline rate or fetal tachycardia Reduced or absent baseline variability

How long does a variable deceleration usually last?

The deceleration meets two of the following:Sixties -Duration is 60 seconds or longer-Lowest value is 60 bpm or lower-Depth is 60 or more bpmProlonged The deceleration lasts > 120 seconds

What are the features of a normal CTG?

Normal intrapartumCTG trace: The normal intrapartum CTG is associated with a low probability of fetal compromise and has the following features:  Baseline FHR is between 110-160 bpm  Variability of FHR is between 6-25 bpm  Decelerations are absent or early  The significance of the presence or absence of accelerations is unclear.