Neurosurgeons never stop learning. As a result of the COVID-19 pandemic, previously obscure terms such as airflow and aerosolization — the dispersal of a substance such as medicine or viral particles in the form of an aerosol — have entered our regular lexicon. We can now readily identify which of our operating rooms has the highest airflow — usually the smallest room — and the standard for the minimum number of air exchanges per hour, which is at least 15.
COVID-19 has brought to light a new spectrum of difficulties for neurosurgeons. Of particular concern are increasing reports of significant morbidity and mortality among otolaryngologists in several countries that have been putatively linked to endonasal surgery. Patel and coworkers from Stanford University highlighted this issue in a letter to the editor in Neurosurgery. They urge precautions for endoscopic transnasal skull base surgery during the COVID-19 pandemic due to the concern that aerosol droplets coming from surgery may increase the possibility of infection of medical staff in the operating room.
In a reply, Huang and colleagues from Huazhong University of Science and Technology in Wuhan, China, were able to provide additional information regarding COVID-19 spread. They believe that compared to droplet transmission, contact transmission may be an equally important factor in transmission in medical workers and was ignored during the early stages of the pandemic due to lack of knowledge. They urge washing hands and cleaning all surfaces in patient units and living areas.
The authors also share that they have learned that intraoperative aspirators, protective clothing, N95 masks and face shields can provide sufficient protection to our medical staff in the surgery room. Huang and colleagues warn that the claim that endonasal surgery will increase the possibility of infection of medical personnel in the operating room might provoke unnecessary anxiety toward endonasal endoscopic procedures based on an anecdotal statement.
Patel and collaborators in their rebuttal accept some of these arguments but point out that emerging evidence also points towards a high viral load within the nasal cavity. When performing endoscopic surgery, while working in and through this corridor, surgical maneuvers can aerosolize mucus particles along with the virus.
In a convergence of the scholarly debate, both groups arrive at similar recommendations with an emphasis on preoperative COVID-19 testing, which should be performed whenever possible. Reduced contact with infected patients and the use of personal protective equipment — including N95 masks, face shields and protective clothing — should be employed for all endoscopic cases and all involved personnel. Powered air-purifying respirator use should be encouraged in cases of symptomatic COVID-19-positive patients needing emergent endonasal surgery. A negative pressure operating room is also recommended. Elective endoscopic transsphenoidal surgery should be delayed, and consideration should be given to transcranial approaches for certain locations where possible.
We share the optimism for the future of endonasal surgery as more data comes to light to guide best practices that will maximize its benefit for our patients while minimizing potential risks to surgeons and other operating room personnel.
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Clemens M. Schirmer, MD, PhD, FAANS, FAHA
Chair, AANS/CNS Communications and Public Relations Committee
Geisinger
Wilkes Barre, PA
On the contrary, several researchers have indicated a decreased incidence of ischemic stroke across the world during the COVID-19 pandemic. The drop in the rate of stroke presentations has been so dramatic that various medical societies and advocacy groups have issued statements urging patients not to delay stroke care out of fear of being exposed to SARS-CoV-2, the virus causing COVID-19. While this a plausible explanation for the decreased incidence of stroke during the height of the pandemic, we believe it may be too early to tell whether this is, in fact, the case.
Kimon Bekelis, MD
Finally, stroke, large vessel occlusions and mechanical thrombectomy have become an area of interest amid the COVID-19 pandemic. Evidence is emerging from epicenters of the crisis — like New York City — that patients, whether afflicted with COVID-19 or not, are seeking medical attention later in their stroke course due to fears regarding COVID-19. We expect many studies to be published in the ensuing months evaluating stroke and mechanical thrombectomy in COVID-19 patients. We are excited about what the future holds in cutting edge research to bring the best available care to stroke patients everywhere.
Justin R. Mascitelli, MD
Other Navy Reserve doctors and nurses are embedded into the New York City public city hospitals that have been decimated with COVID-19. Navy Reserve doctors and nurses are joining their civilian counterparts in treating COVID-19 patients in hospitals where they are most needed. Many are acting in new and expanded roles due to the dramatically increased ICU needs. The shortage does not call for additional neurosurgeons to perform neurosurgery but for additional coverage in overflowing ICUs. These are very sick patients, and neurosurgeons have a tremendous possibility to do some good within this structure. As our medical critical care colleagues take a pounding, neurosurgeons are very comfortable in the ICU, in treating critical patients, in dealing with mortality and in leading large health care teams to make pragmatic, direct and impactful decisions. Indeed, the 
It goes without saying that service in the Navy Reserve rests upon the service of others. Colleagues back home have taken additional emergency call, increased their workload and served the local community in similar ways. Even more so, spouses have to work overtime at home, especially those with small children and those juggling their own virtual careers. Multiple people have come together in numerous ways to serve the people of New York City. And, the welcome in New York City has been one of deep gratitude both inside and outside the hospital.
Initially, physical classes were canceled until late March, by which time any students who had traveled to a COVID-19 hotspot would have completed a 14-day quarantine. The plan was to resume regular classes and clinical experiences following this disruption. However, it became clear within a matter of weeks that this would be impossible. For the safety of students, faculty and patients, it was eventually decided that all physical classes and clinical experiences would be canceled for the foreseeable future. Students at all levels were placed in an uncertain position as it became increasingly clear that in-person learning would not be possible for the remainder of the year. This uncertainty fostered fear and anxiety among students — many of whom were also dealing with the stress regarding their safety and that of friends and family.
Stephen Susa
Then, for one-week, cases of COVID-19 filled the MICU. Shortly after that, our neurosurgical step-down — followed by the neurosurgical ICU — were rapidly converted into negative pressure rooms for COVID-19 patients. That same week, our hospital system placed a hold on all elective, non-emergent surgeries. By Friday, March 20, at a time when there were 
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John Ratliff, MD, FAANS, FACS
Before becoming a neurosurgery resident at 
Myron L. Rolle, MD, MSc