BASIC TERMS AND BASIC TERMS AND CONCEPTS IN CONCEPTS IN OBSTETRICSOBSTETRICS

Dr Farzana KazmiDr Farzana KazmiAssistant ProfessorAssistant Professor

DHQ Teaching HospitalDHQ Teaching Hospital Rawalpindi Rawalpindi

Calculation of EDD :Calculation of EDD :Naegle’s RuleNaegle’s Rule

AddAdd 7 days7 days and and 9 months9 months / /AddAdd 7 days7 days and and subtractsubtract 3 3 monthsmonths in in LMPLMP

Total Gestation:Total Gestation: Forty weeksForty weeks 280 days280 daysViability: Viability: TThe ability of fetus to survive in the he ability of fetus to survive in the

extra uterine environment extra uterine environment after 20 , after 20 , 24, 2824, 28 weeks of gestation or weeks of gestation or weight > 500 gramsweight > 500 grams

Term: Term: After complete 36 weeks After complete 36 weeks till complete 41 weeks of till complete 41 weeks of

gestation gestation

Preterm: Preterm: Before complete 36 weeksBefore complete 36 weeks

Postdate: Postdate: After EDD or complete 39 After EDD or complete 39 weeks till complete 41 weeks till complete 41

weeks weeks

Postterm Postterm After complete 41 weeksAfter complete 41 weeks

Estimation of birth weightEstimation of birth weightLow birth weight: ( LBW):Low birth weight: ( LBW): BBabies who born weighing less than abies who born weighing less than

2,500 grams2,500 grams

Very low birth weight:Very low birth weight: Babies who are born weighing less Babies who are born weighing less

than 1,500 gramsthan 1,500 grams (3 pounds, 4 ounces). (3 pounds, 4 ounces).

Birth weight chartBirth weight chart

ATTITUDE OF FETUSATTITUDE OF FETUS

Relation of various fetal parts to Relation of various fetal parts to other parts. Normally all joints flexedother parts. Normally all joints flexed

Lie of fetusLie of fetus

Relationship of long axis of fetus to Relationship of long axis of fetus to the long axis of motherthe long axis of mother

Longitudinal Oblique / Longitudinal Oblique / Transverse Transverse

PRESENTATION OF FETUSPRESENTATION OF FETUS Presenting partPresenting part Portion of fetus that is presenting Portion of fetus that is presenting

against the cervixagainst the cervix Pelvic gripPelvic grip Paw like gripPaw like grip

PresentationPresentation Vertex Breech FaceVertex Breech Face

Brow Shoulder Brow Shoulder

ENGAGEMENTENGAGEMENTWhen widest part of presenting partWhen widest part of presenting parthas passed successfully through thehas passed successfully through theinletinlet

ENGAGEMENT OF FETAL HEADENGAGEMENT OF FETAL HEAD

STATION OF FETAL HEADSTATION OF FETAL HEAD The level of the lowest fetal bony part The level of the lowest fetal bony part

in relation to imaginary line joining the in relation to imaginary line joining the mother’s ischeal spinesmother’s ischeal spines

POSITION OF FETAL HEADPOSITION OF FETAL HEAD

The relationship of fetal skull to The relationship of fetal skull to maternal pelvismaternal pelvis

Bony land marksBony land marks

POSITIONS OF FETAL HEADPOSITIONS OF FETAL HEAD