Dr. Chapa’s Clinical Pearls.

This- is-CNN. No, that THAT CNN...This is Chapa News Network! WE have late-breaking news developments on 2 fronts: 1. The ACOG has released a clinical update (ACOG ROUNDS) in response to a recent study associating the RSV vaccine and GBS (we covered this study in a past episode). 2. The FDA has EXPANDED the label for an intranasal therapy for Treatment Resistant depression (TRD). Listen in for details.

Around a third of a person’s life is spent asleep. Previous studies have reported an association between sleep disordered breathing, like OSA, and pregnancy complications such as pre-eclampsia, gestational diabetes, and preterm birth. We recently discussed a stillbirth bundle from Australia which includes patient education on sleeping practices and stillbirth risk. Does maternal sleeping position ready influence stillbirth risk? Some data says NO, but there’s a catch to those. Other population level data says YES. Why the difference? And why is the position the mother STARTS to sleep very important here? Listen in for details as we walk down the timeline of data from 2011 to present day.

Internal manual aortic compression is a procedure that may be used intraoperatively in the management of massive pelvic bleeding. But what about EXTERNAL aortic compression? In February’s 2025 AJOG (Grey Journal), under their Surgeon’s Corner section, there will be a very nice video recap of an easy to adopt maneuver which may “buy time” in OB hemorrhage cases as surgical intervention is being planned. This is called the EAC maneuver. First described in 1994, this technique has regained the spotlight as rates of PPH have been on the rise. How is EAC done? Does it work? If so, why is this not part of the OB Hemorrhage bundle? Listen in for details.

Mesenchymal stem cells (MSCs) are multipotent adult stem cells which can differentiate into multiple cell types. MSCs can be isolated from the bone marrow, umbilical cord blood, adipose tissue, muscle, and dental pulp. However, the use of these MSCs involves a number of barriers. Human umbilical cord is limited to collection at birth. Bone marrow and fat biopsy are painful and requires general anesthesia. If only there was an easily obtainable method to collect these MSCs, like maybe even once a month, collectable in a little cup, without biopsy. WHAT… use menstrual blood you say?! Menstrual blood-derived mesenchymal stem cells (MenSCs) were first described by Meng et al. in 2007, as a novel source of MSCs. Most of the MenSC are produced by the endometrium. With the potential of multi-directional differentiation, this has spurred a list of preclinical and animal studies looking into the collection of menstrual blood for MSC processing. Men SCs have been investigated for use in Alzheimer’s disease, Stroke, Spinal Cord Injury, Type I DM, wound healing, endometriosis therapy, infertility, and even Muscular Dystrophy. Is there a miracle med in menses? Listen in for details.

Tachycardia in pregnancy is common and distinguishing between physiological and pathological causes can be a challenge. Plus, until recently, there had not been a well-defined or universally accepted definition of the upper limit of normal for heart rate in pregnancy. But a study published in 2020 from the Green Journal, from the NHS in London has shed light on this issue. The finding of persistent tachycardia beyond a certain rate (and we’ll discuss that rate in this episode), regardless of symptoms, should prompt a search for potential etiologies and at least some basic investigations. Of course, any tachyarrhythmia in pregnancy causing hemodynamic instability requires urgent cardioversion as per adult life support guidelines. In 2023, The Heart Rhythm Society (HRS) developed expert consensus guidelines in collaboration with the American College of Cardiology (ACC), the ACOG, and the AHA to address arrhythmias in pregnancy. In this episode we will focus on and review maternal tachycardia. Does HR really increase by “10-20%” in pregnancy as we all were taught? What heart rate is generally considered evaluable? And what’s the suggested evaluation? Listen in for details.

The stillbirth rate in the US is considerably higher than in many countries with similar resources. In 2021, the United States stillbirth (loss before birth at ≥20 weeks’ gestation) ratio was 5.73 per 1000 births or 1 in 175 pregnancies with 21,000 stillbirths occurring annually. Contrast that to the rate in Japan which is 1.6/1000! The UK and Australia have both implemented stillbirth prevention bundles which have proved worthwhile. It is long past due for the US to have its won national stillbirth prevention bundle. In this episode we will review a publication from Aug 2024 (AJOG) describing this bundle proposal and highlight a letter to the editor from January 9, 2025 in the AJOG in response to that August publication. Listen in for details.

Guillain-Barré syndrome (GBS) is a rare disorder that causes muscle weakness and sometimes paralysis. It's caused by the body's immune system damaging nerves. While most cases are triggered by respiratory or gastrointestinal infections, vaccinations have also been linked to GBS pathogenesis. GBS can last from weeks to years, but most people start to recover within a few weeks. The earlier symptoms improve, the better the outlook. Physical therapy is important to prevent muscle contractures and deformities. Some people may experience long-term weakness, numbness, fatigue, or pain. A small percentage of people with GBS may have a relapse, which can cause muscle weakness years after symptoms end. On Jan 7, 2025, the FDA required and approved UPDATED safety labeling changes to the Prescribing Information for Abrysvo (Respiratory Syncytial Virus Vaccine) manufactured by Pfizer Inc. and Arexvy (Respiratory Syncytial Virus Vaccine, Adjuvanted) manufactured by GlaxoSmithKline Biologicals. Specifically, FDA has required each manufacturer to include a new warning about the risk for Guillain-Barré syndrome (GBS) following administration of their Respiratory Syncytial Virus (RSV) vaccine. Who is most at risk for GBS? Where pregnant women affected? This is important information….listen in for details.

Sometimes you read a new study and you just have to say, "You Don't Say?!" In this episode, we will highlight 2 publications which were released Dec 26. 2024 and Jan 6, 2025 which make you say just that. This is a brief, fun, YET STILL EDUCATIONAL, episode...Listen in for details.

In this episode, we will cover 2 topics: the first is brand new in print (01/06/2025 ), and the second is just weird. In the “new” portion we'll summarize a new randomized study published in JAMA Network dealing with gestational diabetes. Should we add glyburide to metformin for GDM control? Listen in for details. In the second portion, we'll focus on unilateral ovarian absence not related to previous removal. Yep! This is why it's very important to check the adnexa at “routine” C-section or “routine” gynecological surgery. It is possible to be missing an ovary…and its weird! Listen in for details!

Preterm infants, especially those born at periviability, are at inherent risk of a variety of short-term neonatal complications- depending on their gestational age- including sepsis, respiratory distress, IVH, and have an overall higher mortality compared to term born infants. Well known interventions are intended to reduce these complications; these include antenatal corticosteroids, magnesium sulfate for CNS protection, and antibiotics for latency in PPROM. This is an even bigger issue for those born in the periviable interval. That group is a unique population. But does mode of delivery matter? Cesarean delivery is currently not recommended before 25 weeks' gestation unless for maternal indications, even in the setting of malpresentation. We’ll cover recently stated guideline in this episode. These recommendations are based on a lack of evidence of improved neonatal outcomes and survival following cesarean delivery and the maternal risks associated with cesarean delivery at this early gestational age. Plus, for non-vertex presenting fetuses, C-section has been reported to reduce risk of neonatal mortality, but what about vertex presenting preterm/periviable babies? In this episode, we will review the mode of delivery and neonatal outcomes in preterm birth with a special focus on those born in the periviable interval, like 22- and 23-weeks gestation. There’s lots to cover here…so listen in for details.

In most regions of the United States, RSV season starts in the fall and peaks in the winter. In September 2023, the ACOG released a Practice Advisory recommending a single dose of Pfizer’s RSV vaccine (Abrysvo) for eligible pregnant individuals between 32 0/7 and 36 6/7 weeks of gestation who do not have a planned delivery within 2 weeks, using seasonal administration, to prevent RSV lower respiratory tract infection (LRTI) in infants. This is recommended from September to January. Currently, the US recommendation is for this to be given once, with subsequent deliveries receiving neonatal Beyfortus in RSV season. The recommendation from NICE is to have this vaccination with every pregnancy. The prescribing information for Abrysvo includes a warning to inform patients that a numerical imbalance in preterm births in Abrysvo recipients (5.7%) occurred compared to those who received placebo (4.7%). This imbalance was only seen in trial participants residing in low- to middle-income countries with no temporal association to vaccination or association with other adverse events in the mother or the newborn. Now, that phase 3 clinical data has gone through peer review and is a new publication. This is the MATISSE global study and will be officially published in the Green Journal February 2025…but we will summarize the results NOW in this episode! Listen in for details.

In August 2024, researchers at Columbia University published a study that found measurable concentrations of 16 metals in multiple brands of tampons. The study evaluated levels of metals like cadmium, manganese, and arsenic in 30 tampons across 14 different brands. The study concluded that using tampons may be a potential source of metal exposure. We covered this publication in JULY 2024 before it was released! In response to the study, the FDA launched an investigation that includes 3 parts: 1. An independent literature review to learn more about data available regarding the presence of chemicals in tampons and possible health effects , 2. A laboratory study to evaluate metals in tampons and potential exposure people may experience when using them, and 3. Toxicity testing to identify potentially harmful substances and assess the risk of those substances being absorbed by the body. The literature review has been completed and was released by the FDA on Dec 23, 2024. Listen in for details.

Low-dose aspirin (LDA), typically prescribed at a dosage of 81 mg daily, is primarily used during pregnancy to prevent or delay the onset of preeclampsia. However, the question of whether to continue LDA postpartum is less clear and requires careful consideration of the benefits and risks associated with its use in the postpartum period. After all, the American College of Cardiology and American Heart Association recommend that low-dose aspirin use (75 to 100 mg/d) might be considered for the primary prevention of atherosclerotic CVD among select adults ages 40 to 70 years at higher CVD risk but not at increased risk of bleeding. Meanwhile, the 2022 US Preventive Services Task Force (USPSTF) recommendation notes that the decision to initiate daily aspirin therapy for primary prevention of cardiovascular disease (CVD) should be made on a case-by-case basis for adults ages 40 to 59 with a 10% or greater 10-year CVD risk. The recommendation applies to those without signs or symptoms of clinically evident CVD who are not at an increased risk of bleeding. So, does continuation of LDA after delivery reduce the persistence of, or development of, chronic hypertension. Is that evidence-based? The answer is both YES and NO. Listen in for details.

Somethings in medicine are pretty cut and dry. Others...not so much. Such is the case with obstetrical management of PPROM with a cervical cerclage in place. Should it be removed, or left in place? While the ACOG has some guidance from March 2020, there has been additional publications released, including one from SMFM. PLUS, a November 2024 review on the topic (AJOG MFM) has suggested a practical approach to this clinical scenario. Listen in for details.

In late 2024, the CDC updated their MEC on contraception in those with medical co-morbidities. Obesity (BMI >/= 30) was also referenced in that revision. NOW, coming out officially in 2025, The Society of Family Planning has released their committee statement on "contraception and body weight". Is there a certain BMI class where a type of BC is contraindicated? Does BC make you fat?! Listen in for details.

We have made SIGNIFICANT progress in our ability to screen for fetal RH factor using cell free DNA from maternal blood. Cell-free DNA to determine the fetal RHD genotype from the maternal circulation was first described in 1993. We have come so far since them. In March 2024, the ACOG released a Practice Advisory stating, “the use of NIPT to prioritize use of RhIg and conserve RhIg supply is a reasonable consideration”. Two U.S. companies have introduced cell-free DNA assays for RHD as part of their noninvasive prenatal testing assays. These assays use next generation sequencing to determine the presence of fetal RHD DNA. These tests are NEAR perfect in accuracy (we will review the latest data here). So, how can it be possible to detect the RHD gene (when truly present), yet the fetus ultimately be found to have RH negative blood? In other words, how do we explain the occurrence of genotype/phenotype discrepancy? The science is clear. In this episode, we will review this unusual phenomenon and summarize a recent (November 2024) clinical validation study on the use of cell free DNA test testing to look for this “genomic variance”. This article was also on the Green Journal’s “Spotlight on Fetal RHD” on 12/16/2024. Is this common? And which patient population is more likely to have this? Listen in for details.

The saying says, “The Devil is in the details”. This idiomatic phrase that means even the grandest project depends on the success of the smallest components. So is the case with low dose ASA for preeclampsia prevention. Currently, the ACOG states, “Low-dose aspirin (LDA) (81 mg/day) prophylaxis is recommended in women at high risk of preeclampsia and should be initiated between 12 weeks and 28 weeks of gestation (optimally before 16 weeks) and continued daily until delivery” (ACOG CO 743; 2018). But the DOSE of LDA is controversial with mounting data that the minimal dose should be 100mg, with leading commentaries pushing for 162 mgs here in the US. We have covered this MANY times on our show. But there is a separate issue here that is often missed. Does it matter WHEN in the day this is taken? Is taking LDA first time in the morning best? What about after lunch? At bedtime? There is data here to guide us. In this episode, we will review the CHRONOBIOLOGIC response of LDA in pregnancy. Yes, that is a real term! This is also reflected in the March of Dimes data. Plus, there is Level I data supporting the best time to take aspirin- and it is fascinating. Listen in for details.

EVERYTHING CHANGES! So true. And now, the USPSTF has changed (UPDATED) their recommendations for cervical cancer screening in regards to HPV primary screening. This is BRAND NEW, within the last 24 hours. Primary HPV screening for cervical cancer has gained a lot of steam and is progressing quickly. The FDA approval of “dual stain” testing of hrHPV positive results, the recent FDA approval for patient self-collection for HPV vaginal samples in a clinical setting, and now this new draft recommendation from the USPSTF. What did they update? How is that controversial? Listen in for details!

Well, in this episode we have 2 very interesting and challenging clinical situations. These come from real world clinical encounters so we thought we would share these with you because they are brain teasers and should be discussed. They both have to do with OB ultrasound. First, is there a “minimal” CRL to estimate gestational age? In other words, is there a CRL that is too small to be accurate? It’s an intriguing question and we will give an answer! Second, in women with regular and predictable menstrual cycles that are every 21 or 35 days, how to we “reconcile” a CRL EGA since that CRL algorithm is based on a “typical 4-week cycle”? How can we? Should we adjust the sono dating? WE will review in this episode. PLUS, we will review the latest data on how AI can greatly impact gestational age calculation via ultrasound. So, we have 2 questions, and we will give 2 answers (2 x2)…Listen in for details.

Acetaminophen (Paracetamol) is a common over-the-counter medication that has gained substantial media attention regarding its use by pregnant women. Although estimates vary considerably, most studies and surveys report that around 40–65% of women take acetaminophen sometime during their pregnancy. Historically considered safe, concern was initially raised back in 2014 with a JAMA Pediatrics publication stated that use in pregnancy lead to ADHD in the offspring. Seven years later, in 2021, a consensus statement published in Nature Reviews Endocrinology suggested that acetaminophen use in pregnancy might increase the risk of neurodevelopmental and urogenital tract abnormalities in offspring and called for “precautionary action”. This lead tgo an ACOG response back in Sep 29, 2021 (we will review). This is very controversial. Today, Dec 5, 2024, a new clinical perspective was published in Obstetrics & Gynecology adding another flavor to the mix. Is acetaminophen a direct cause of fetal harm? Listen in for details!