What causes sinusoidal fetal heart rate pattern?

What causes sinusoidal fetal heart rate pattern?

Sinusoidal fetal heart rate pattern (FHR) is regarded by most authors as signifying a compromised fetus. In most cases, this is secondary to fetal anemia of different causes, usually Rh isoimmunization, more rarely to fetomaternal transfusion, bleeding vasa previa, placental chorioangioma, or traumatic amniocentesis.

Which drug does cause a sinusoidal heart rate pattern?

From these we conclude that Stadol therapy during labor is strongly associated with the appearance of sinusoidal fetal heart rate pattern. There were no short-term maternal or neonatal adverse sequelae.

How long does a sinusoidal pattern last?

These authors noted that SHR pattern appeared approximately 19 min following alphaprodine administration and persisted for approximately 60 min. All infants were delivered with normal 5-minute Apgar scores without any perinatal deaths. In 27 cases of sinusoidal FHR pattern during labor, Ayromlooi et al.

What category is a sinusoidal pattern?

Category III: Abnormal The new NICHD guidelines label four FHR patterns as abnormal. One of the abnormal patterns is a sinusoidal heart rate, defined as a pattern of regular variability resembling a sine wave, with fixed periodicity of 3–5 cycles/ min and amplitude of 5–40 bpm.

What can cause sinusoidal 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 does a sinusoidal heart rate mean?

A sinusoidal heart-rate pattern (SHR) is usually considered to signify fetal distress. Two cases are reported in which a sinusoidal-like fetal heart-rate pattern was caused by fetal sucking movements as observed by real-time ultrasonography.

What causes a true sinusoidal pattern?

What causes sinusoidal pattern?

Is sinusoidal a Category 3?

NICHD Category III (CIII) fetal heart rate tracing (FHR) is defined as having either sinusoidal pattern or absent baseline variability plus recurrent late decelerations, recurrent variable decelerations, or bradycardia.

What does sinusoidal pattern indicate?

SINUSOIDAL PATTERN It indicates severe fetal anemia, as occurs in cases of Rh disease or severe hypoxia.