Welcome Sharon, can you describe your current position and responsibilities?
Thanks very much, Zach. I am an obstetric anesthesiologist at Brigham and Women’s Hospital in Boston. Our labor and delivery unit performs approximately 7,000 deliveries a year, and we are a quaternary referral maternal care center. Currently, I am the director of resident education and the associate fellowship program director for the division of obstetric anesthesia. I become the fellowship program director in the fall. My research focuses on using large databases to study maternal morbidity and mortality.
Let’s start with some nuts and bolts: what techniques do you favor for epidural/spinal anesthesia in terms of needles/equipment, dosing, and medications?
One of my favorite techniques for epidural analgesia is the dural puncture epidural (DPE), which involves making an intentional hole in the dura with a pencil-point 25 gauge spinal needle, after obtaining loss of resistance with the epidural needle, and before threading the epidural catheter. I find the DPE particularly useful in patients in whom neuraxial placement may be difficult, including those with obesity, those with spinal abnormalities (such as scoliosis), or those with a history of patchy/poorly functioning epidural. Though there has been some conflicting evidence published recently, the majority of studies show that the DPE confers a faster onset time, better sacral coverage, and less one-sided blockade when compared to the traditional epidural technique. I typically bolus my epidurals with low-dose bupivacaine (0.0625%) and utilize programmed intermittent epidural boluses (PIEB) in my pump settings. The lower-dose bupivacaine concentrations help to decrease the risk of motor block, while the PIEB settings help optimize analgesia via increased spread of local anesthetics within the epidural space.
For spinal anesthesia for cesarean delivery, I typically use 12 mg 0.75% hyperbaric bupivacaine with 15 mcg of intrathecal fentanyl and 100 mcg of morphine. For those in whom the operative time is expected to be longer than normal, I will often perform a combined spinal-epidural (CSE). For example, I use a CSE in patients with a history of multiple prior cesarean deliveries and/or uterine surgeries (with anticipated adhesions, scarring, and difficult surgical exposure) and patients with suspected placenta accreta spectrum disorders.
What do you find most rewarding about OB anesthesia?
In short, everything! I love being an integral team member for one of the most memorable (and hopefully the most joyful) moments in a woman’s life. Of course, being able to alleviate labor pain and also providing emotional comfort during cesarean deliveries are particularly rewarding. And the best part of being so passionate about these parts of my job is that I get the opportunity to share these rewarding moments and experiences with trainees, both residents and fellows.
What do you find most challenging/most frightening?
To me, the most challenging and frightening part of obstetric anesthesia is that we take care of healthy young women who may experience significant, life-threatening complications associated with childbirth, such as postpartum hemorrhage, coagulopathy/DIC, or flash pulmonary edema from preeclampsia. It falls on us as OB anesthesiologists to shepherd them through these crises, protect their health, and allow them to return to their newborns and to focus on being a mother.
What is the craziest thing you have seen in your practice?
A very memorable case I had in fellowship was that of a woman with a history of prior deliveries complicated by postpartum cardiomyopathy, who then developed a low ejection fraction at baseline. She presented in her third trimester with volume overload and an EF <30%. She needed an urgent cesarean delivery, and this required rapid coordination between obstetric anesthesia, cardiac anesthesia (who performed intraoperative transesophageal echo), maternal/fetal medicine, the heart failure team, and finally the ECMO team, who cannulated for extracorporeal support prior to incision.
Do you see obstetrical anesthesia as a core competency, or is the field becoming complex enough that a fellowship is required?
I think it’s both. It is critical that anesthesia residents be comfortable not only with the technical skills needed to perform neuraxial anesthesia, but just as importantly, they should be well versed in the management of pregnant women throughout the peripartum period. Even anesthesiologists who do not work on labor and delivery will inevitably encounter pregnant women (and recently postpartum women) undergoing surgery in the general ORs. Therefore, a clear understanding of maternal physiology and the care of the pregnant woman is certainly a core competency.
However, it is increasingly being recognized by national societies such as the American College of Obstetricians and Gynecologists (ACOG) and the Society for Maternal-Fetal Medicine (SMFM), that the most specialized birthing centers, such as level III and IV centers, should be staffed by anesthesiologists with specialized training in obstetric anesthesia. In this way, referral centers that care for women with high-risk comorbidities or high-risk surgical conditions are becoming complex enough that fellowship in obstetric anesthesia is key to functioning clinically in that setting.
Can you describe your vision for optimal anesthesia staffing of an obstetrical unit in the community and academic setting? How might this vary by number of deliveries?
As I mentioned, national societies are increasingly recognizing the importance of having anesthesiologists with specialized training in obstetric anesthesia staff units that care for women with complex medical or surgical conditions. In these types of settings (level III or IV centers), it is necessary to have an anesthesiologist physically present at all times on the obstetrical unit. Ideally this anesthesiologist should have specialized training in obstetric anesthesia.
In contrast, at level I or II centers, including smaller community hospitals, an anesthesiologist should be readily available at all times, though they may also be covering other anesthetizing locations such as the main OR. Each labor and delivery unit should carefully examine their delivery volume and operative numbers in order to delineate safe 24/7 coverage. Exact recommendations for staffing based on delivery volume is a tricky issue, and I think this would actually be a fascinating topic to study. Certainly the tighter the anesthesia provider staffing, the more likely there is to be inadequate staffing for emergent deliveries, and the longer patients have to wait after requesting an epidural. There may have to be some operational trade-offs, but maternal care should never suffer.
What is your view on more rural/isolated facilities participating in obstetrical care but doing few deliveries on a yearly basis? Is this reasonable, or not worth the risk?
There has been an increasing regionalization of maternal care, and we know that women at high risk for maternal morbidity, including those with cardiac disease, or women at significant risk for postpartum hemorrhage, should deliver at level III or IV hospitals. Of course, smaller or more rural facilities, such as level I or II centers, may be participating in obstetric care, but it is critical that appropriate prenatal risk stratification of parturients occurs at these locations, ensuring that women at elevated risk for maternal morbidity deliver at centers well equipped to manage their conditions.
What advice do you have for new graduates entering a practice where they will potentially be covering OB units on their own, nights and weekends?
My advice is to take advantage of residency training while you can. Ask your attendings not just what they do, but more importantly, why, so when you are the one who has to make split-second life-or-death decisions, you will be able to reason quickly, even under stress. And don’t forget, a lifeline is just a phone call away; don’t hesitate to call your colleagues or former attendings when you are covering OB units and a question comes up. We get many such phone calls from former residents to our OB anesthesia workroom!