Notes on Contraction Stress Test

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What is a Contraction Stress Test?

• Done when biophysical profile is 4 or 6.

• Tests the ability of the fetus to tolerate transitory decreases in intervillous blood flow that occurs with uterine contraction.

• Detects the presence or absence of late decelerations.

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

• The deceleration onset is delayed in relation to contractions.

• Three contractions in 10 minutes must be present.

Negative Contraction Stress Test:

• No late decelerations with 3 uterine contractions in 10 minutes.

• Reassuring.

• Repeat weekly.

Positive Contraction Stress Test:

• Late decelerations seen with 3 uterine contractions in 10 minutes.

• Non-reassuring.

• Promptly deliver.

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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