What is sinusoidal pattern on CTG?

A sinusoidal pattern is an oscillating pattern which is typically smooth and regular. It has a relatively fixed period of 2-5 cycles per minute and has an amplitude of between 5 and 15 bpm around the baseline rate. Baseline variability is absent and there are no accelerations.

What causes a sinusoidal fetal heart rate pattern?

FETAL CONDITIONS ASSOCIATED WITH SHR PATTERN: SHR pattern has been reported with the following fetal conditions: (1) severe fetal anemia of several etiologies; (2) effects of drugs, particularly narcotics; (3) fetal asphyxia/hypoxia; (4) fetal infection; (5) fetal cardiac anomalies; (6) fetal sleep cycles; and (7) …

What are the characteristics of a true sinusoidal pattern?

On the other hand, true sinusoidal FHR pattern is characterized by the following: (1) stable baseline FHR of 120–160 bpm; (2) amplitude of 5–15 bpm; (3) frequency of 2–5 cycles per minute; (4) fixed or flat short-term variability; (5) oscillations of the sinusoidal wave form above and below a baseline; and (6) no area …

What are the features of a normal fetal CTG?

Normal antenatal CTG trace: The normal antenatal CTG is associated with a low probability of fetal compromise and has the following features: Baseline fetal heart rate (FHR) is between 110-160 bpm Variability of FHR is between 5-25 bpm Decelerations are absent or early Accelerations x2 within 20 minutes.

Why are fetal heart rate patterns called sinusoidal?

Background: In 1972, Manseau et al. and Kubli et al. described an undulating wave form alternating with a flat or smooth baseline fetal heart rate (FHR) in severely affected, Rh-sensitized and dying fetuses. This FHR pattern was called ‘sinusoidal’ because of its sine waveform.

How is CTG acquisition performed on a fetal monitor?

CTG acquisition can be performed by portable sensors that transmit signals wirelessly to a remote fetal monitor (telemetry). This solution has the advantage of allowing the mother to move freely during signal acquisition, rather than be restrained to bed or a sofa, and should therefore be the preferred option when available.

Is the antenatal CTG normal without accelerations?

An antenatal CTG should not be considered normal without the presence of accelerations, although its absence during late labour is of “uncertain significance”.

What is sinusoidal pattern on CTG? A sinusoidal pattern is an oscillating pattern which is typically smooth and regular. It has a relatively fixed period of 2-5 cycles per minute and has an amplitude of between 5 and 15 bpm around the baseline rate. Baseline variability is absent and there are no accelerations. What causes…