ACOG defines arrest of the first stage of labour as completed latent phase with uterine contractions of strength > 200MVUs without cervical changes for______

Ans. b (2 hours) (Ref Williams Obstetrics 22nd/Ch, 22; p. 540)# The latent phase has been completed, with the cervix dilated 4 cm or more. A uterine contraction pattern of 200 Montevideo units0 or more in a 10-minute period has been present for 2 hours without cervical change.# Arrest of dilatation was defined as 2 hours with no cervical change, and arrest of descent as 1 hr without fetal descent.# Friedman and Sachtleben (1963) defined a prolonged latent phase as being greater than 20 hours in the nullipara and 14 hours in the multipara.Criteria for Diagnosis of Abnormal Labor Due to Arrest or Protraction DisordersLabor PatternNulliparaMultiparaProtraction disorderDilatation< 1.2 cm/hr< 1.5 cm/hrDescent< 1.0 cm/hr< 2.0 cm/hrArrest disorderNo dilatation> 2 hr>2 hrNo descent> 1 hr> 1 hrAbnormal Labor Patterns, Diagnostic Criteria, and Methods of TreatmentDiagnostic CriteriaLabor PatternNulliparasMultiparasPreferredExceptional TreatmentProlongation Disorder(Prolonged latent phase)> 20 hr> 14 hrBed restOxytocin or cesarean delivery for urgent problemsProtraction Disorders 1 Protracted active-phase dilatation< 1.2 cm/hr< 1.5 cm/hrExpectant and supportCesarean delivery for CPD2. Protracted descent< 1.0 cm/hr< 2 cm/hr Arrest Disorders 1. Prolonged deceleration phase>3 hr> 1 hrOxytocin without CPDRest if exhausted2. Secondary arrest of dilatation 3. Arrest of descent>2 hr>2 hrCesarean delivery with CPDCesarean delivery4. Failure of descent> 1 hr, with no descent in deceleration phase or second stage>1 hr