Notes on Fetal Heart Rate Accelerations

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What are Fetal Heart Rate Accelerations?

• These are abrupt increases in fetal heart rate above the baseline lasting < 2 minutes.

• Unrelated to contractions.

• Mediated by sympathetic nervous system.

• Always reassuring.

Less than 30 weeks gestational age:

• The increase should be ≥ 10 beats/min lasting ≥ 10 sec.

More than 32 weeks gestational age:

• The increase should be ≥ 15 beats/min lasting ≥ 15 sec.

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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