Late Decelerations of Fetal Heart Rate

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What are Late Decelerations of Fetal Heart Rate?

• These are gradual decreases in fetal heart rate below the baseline with onset to nadir ≥ 30 seconds.

• Deceleration onset and end is delayed in relation to contractions.

• Mediated by either vagal stimulation or myocardial depression.

• Occur in response to uteroplacental insufficiency.

• Always non-reassuring and associated with fetal acidosis.

Graph of Late Decelerations of Fetal Heart Rate:

late 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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