Related Experiment Videos
Intrauterine growth retardation
Insights
Diagnosing intrauterine growth restriction (IUGR) is challenging. Early ultrasound and serial measurements improve detection rates, distinguishing between small for gestational age and growth-restricted fetuses for better management.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Diagnostic Imaging
Background:
- Diagnosing intrauterine growth restriction (IUGR) presents significant challenges, particularly differentiating dysmature infants from constitutionally small ones.
- Accurate gestational age assessment is crucial for antenatal detection of IUGR.
Purpose of the Study:
- To outline strategies for the antenatal diagnosis and management of IUGR.
- To improve the identification of fetuses at high risk for growth retardation.
Main Methods:
- Routine early ultrasound for biparietal diameter (BPD) to establish gestational age.
- Serial symphysis-fundal height (SFH) measurements and third-trimester ultrasounds for screening.
- Detailed serial growth parameter measurements and H/A ratio charts for classifying IUGR.
- Pulsed Doppler ultrasound for flow velocity waveform analysis.
Main Results:
- Early ultrasound for BPD is essential for accurate gestational age determination.
- Clinical methods combined with SFH or repeat ultrasound can detect approximately 85% of IUGR cases.
- The H/A ratio chart aids in differentiating asymmetric and symmetric IUGR for tailored management.
- Doppler ultrasound shows potential for future rationalization of antenatal fetal monitoring referrals.
Conclusions:
- Accurate gestational age determination via early ultrasound is fundamental for IUGR diagnosis.
- A combination of clinical and ultrasound methods enhances the detection of growth-restricted fetuses.
- Antenatal classification of IUGR subtypes guides appropriate investigation and management strategies.
- Doppler ultrasound may refine future antenatal surveillance protocols for high-risk pregnancies.
Abstract:
The many problems of diagnosing IUGR are compounded by a lack of ability to detect the dysmature infant from the constitutionally small infant even at birth. Antenatal attempts at detecting IUGR must start with the accurate establishment of gestational age. This can be only accomplished by routine early ultrasound measurement of BPD for all pregnant patients. Subsequently, management is aimed at screening out a group at high risk for having a growth-retarded fetus. Clinical means are poor but SFH measurements or a repeat ultrasound in the third trimester can be expected to detect about 85% of IUGR patients. Diagnosis of IUGR is made by detailed measurement of growth parameters on a serial basis. The use of the H/A ratio chart allows the antenatal division of IUGR into asymmetric and symmetric, such that appropriate investigation and management can be undertaken. The study of flow velocity waveforms obtained by pulsed Doppler ultrasound might in the future help to provide a more rational basis for referring patients to intensive antenatal fetal monitoring.