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    Is intervention in our DNA?

    Inherent to our specialty is the lack of good-quality prospective RCTs that look at the short- and long-term benefits and risks of not only ACS but much of what we do. [“Should we take another look at antenatal corticosteroids?” March 2017 Contemporary OB/GYN] Yet we tend to intervene. I believe it’s in our DNA. We desire to improve the clinical situation and sometimes become myopic. Also, some colleagues (mostly MFMs) believe that “doing something is better than doing nothing.” The debate over ACS at near term may be an example of such an intervention in search of an indication. Even after 40 years of study we lack precise information regarding the pharmacological induction of desired biologic effects. We have been assured about the standard 2-dose protocol of B-methasone 24 hours apart but we know nothing about the latent phase of one dose with regard to clinical relevance. No prospective RCTs exist using ACS in twin pregnancies. Let’s be deliberate so we can provide a provable benefit and not promote false hope that ultimately harms our patients as well as ourselves and our specialty.

    Via the web

    In Reply

    Thank you for your comments. With any intervention, we must present benefits, risks, and alternatives. The potential benefits must outweigh any known risks. Clinical trials in obstetrics are difficult to design. The hard part is identifying clinically relevant endpoints. Are they maternal, fetal, or both? Will the benefits persist or result in unintended consequences? In designing an RCT there is always tension between choosing the most relevant endpoint and sample size and power. Our specialty is unique in that we are caring for at least 2 patients at once. While it is relatively easy to perform an RCT evaluating a short-term outcome such as RDS or cesarean rate, it is very difficult and expensive to perform long-term outcome studies to see the real impact. Without funding and follow-up studies, we will never know for sure whether the perceived benefits of a reduction in respiratory morbidity offset potential long-term health consequences. Hopefully, clinicians will use caution in the use of ACS near or at term and make sure to document informed consent before administering ACS at a critical time in brain development. This is a very slippery slope and clinicians should proceed cautiously. 

    Debra A Guinn, MD


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