Variable Decelerations of Fetal Heart Rate

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What are Variable Decelerations of Fetal Heart Rate?

• These are abrupt decreases in fetal heart rate below the baseline of at least 15 beats/min onset to nadir of < 30s.

• These are variable in relation to contractions.

• Mediated by vagal stimulation.

• Due to umbilical cord compression.

Mild Variable Decelerations:

• Drop by 15-40 beats/min.

Moderate Variable Decelerations:

• Drop by 40-60 beats/min.

Severe Variable Decelerations:

• Drop > 60 beats/min or last ≥ 60 seconds.

Graph of Variable Decelerations of Fetal Heart Rate:

variable decelerations diagram

Additional Reading:

Notes on Stages of Labor:

1. Diagram of Stages of Labor
2. First Stage of Labor
3. Second Stage of Labor
4. Third Stage of Labor
5. Fourth Stage of Labor

Tests for Fetal Well-Being:

1. Notes on Non-Stress Test
2. Notes on Contraction Stress Test
3. Unresponsive Fetus Algorithm

Periodic Changes in Fetal Heart Rate:

1. Fetal Heart Rate Accelerations
2. Variable Decelerations of Fetal Heart Rate
3. Early Decelerations of Fetal Heart Rate
4. Late Decelerations of Fetal Heart Rate

Types of Spontaneous Abortion:

1. Notes on Complete Abortion
2. Notes on Incomplete Abortion
3. Notes on Threatened Abortion
4. Notes on Inevitable Abortion
5. Notes on Missed Abortion

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