L4: Labor (Physiology)

Question 1

Physiology of Labor

Answer 1

• 1st Stage
• 2nd Stage
• 3rd Stage

Question 2

Physiology of 1st Stage of Labor

Answer 2

Question 3

Def of 1st Stage of Labor

Answer 3

Stage of cervical dilatation up to fully dilated cervix.

Question 4

Extent of 1st Stage of Labor

Answer 4

Starts e onset of labor & ends e full cervical dilatation.

Question 5

Duration of 1st Stage of Labor

Answer 5

• In nullipara: 10-16 hours.
• In multipara: 6-8 hours.

Question 6

Events of 1st Stage of Labor

Answer 6

• Cervical Effacement
• Cervical Dilatation

Question 7

Def of Cervical Effacement

Answer 7

Taking up of cervix into LUS leading to shortening of cervical canal.

Question 8

Mechanism of Cervical Effacement

Answer 8

• Muscle fibers of internal os are taken up into LUS followed by taking up of muscles of cervical canal.

Question 9

Relation of Cervical Effacement to Dilatation

Answer 9

• In nullipara: Effacement occurs at 1st followed by dilatation.
• In multipara: Both effacement & dilatation occur simultaneously.

Question 10

Assessment of Cervical Effacement

Answer 10

a) Zero: If cervical canal is > 2 cm.
b) 50% effaced: If cervical canal is 1 cm.
c) 100% effaced: If cervical canal is < 0.25 cm.

Question 11

Def of Cervical Dilatation

Answer 11

Progressive opening of cervix.

Question 12

Causes “Triggers” of Cervical Dilatation

Answer 12

Question 13

Mechanism of Cervical Dilatation

Answer 13

Cervical dilatation occurs from above downwards (internal os dilates at 1st then cervical canal & finally external os dilates).

Question 14

Assessment of Cervical Dilatation

Answer 14

Question 15

Pattern of Cervical Dilatation

Answer 15

• Latent Phase
• Active Phase

Question 16

Pattern of Cervical Dilatation

• Latent Phase

Answer 16

Question 17

Pattern of Cervical Dilatation

• Active Phase

Answer 17