key: cord-1055433-aovsagqc
authors: Lewkonia, Peter
title: Response to surgical triage in an evolving pandemic based on disease classification and predictive modelling
date: 2020-08-14
journal: World Neurosurgery
DOI: 10.1016/j.wneu.2020.08.063
sha: 0921ef06e5f5c429825e8c775bca4949aaa00223
doc_id: 1055433
cord_uid: aovsagqc

nan

The COVID-19 global pandemic has had a profound effect on not only our daily way of life, but also on health care delivery and health systems worldwide. During the winter and spring of this year, health systems responded to the pandemic threat with a battery of public health measures designed to both treat and triage the ill, but also to prevent infections and importantly, to prepare the health system itself for a surge of infected patients 1 . One of the most common mechanisms to increase health system and hospital capacity has been the cancellation or delay of scheduled and elective surgery [2] [3] [4] [5] [6] .

Those who argue for elective surgery postponements cite several critical benefits. First, the reduced utilization of resources such as operating room time, drug and blood products, and equipment such as ventilators allows for reallocation to treat those patients who become ill and hospitalized with COVID-19 7 . Furthermore, the reduction in staff utilization allows redeployment to areas of high demand. Although spinal surgeons may not be directly re-allocated, they may be able to fill in gaps in care where colleagues in other disciplines (such as orthopaedic and neurosurgical trauma care) have been called upon take on new clinical duties. Importantly, other surgical staff such as nurses and anesthesiologists can also be re-deployed to clinical areas where their skills are required.

Secondly, admission of patients to hospital introduces the risk of nosocomial infection 6, 8 . As the incubation period of the novel coronavirus averages around 5 or 6 days, patients may present to hospital infected without symptoms and subsequently risk further spread to others 9 . Furthermore, patients are at risk while admitted to hospital of transmission from other patients or hospital workers. Adding to the impact of this particular risk, patients who undergo surgery while ill with COVID-19 have a significantly increased mortality risk 10 .

The reallocation of resources, however, is not without consequence. In other areas of medicine, such as cardiac care 11 , the treatment of other infectious diseases such as tuberculosis and HIV 12 , and even time-sensitive cancer care and stem cell transplant 13 , the shift of available clinical resources may already be having consequences and putting patients at risk of adverse outcomes from other health conditions. Additionally, the resumption of surgical and other procedural services will represent a significant logistical and clinical challenge especially in health systems which have limited ability to add surgical capacity once the pandemic restrictions have passed 2,6 .

The overwhelming body of advice from multiple surgical societies has strongly advised complete cessation of surgical procedures which can be postponed or delayed 4 and it appears that these guidelines have been followed 2,6,14 with only some ambulatory procedures continuing 8 . The obvious consequence of this policy is the need to address the potential morbidity of delayed care especially given that the timeline for the resumption of normal surgical services is far from clear. It is wellestablished that withholding care from patients for whom surgical intervention has distinct and predictable benefit in order to preserve resources for future need is neither appropriate nor morally acceptable 15 .

The practice of spine surgery includes many patients with chronic clinical pathologies as well as some with acute presentations. It also varies between short procedures such as posterior decompression operations that are often performed in an ambulatory, outpatient fashion up to multi-stage, multi-day procedures that incur significant morbidity, long hospital length of stay and utilize considerable hospital resources. Given this variety, spine surgery units around the world have faced a challenge in attempting to rationalize the suspension of some surgical services while prioritizing others. There is little doubt that J o u r n a l P r e -p r o o f this challenge has been approached differently across the globe and the evidence also points to a substantial burden of anxiety and even financial stress among the spine surgical community 14 .

Several groups have attempted to define fair and objective criteria for the continuation of selected spine procedures during pandemic situations [16] [17] [18] . In addition, work was done early in the pandemic by several groups in Southeast Asia to both develop treatment plans and create standardized protocols for screening of patients requiring urgent or elective surgery 8, 16 . All groups and current guidelines share certain characteristics. This includes allowing procedures for treating urgent or progressive neurological deficit, acute spinal trauma either with significant acute instability or neurologic injury and most surgical procedures deemed necessary for oncologic indications to proceed. At least one group has also suggested that certain urgent but less acute surgical procedures could be transferred to alternate centralized facilities in order to avoid placing additional strain on hospitals with a large burden of care for patients with respiratory illness 4,18 .

One of the difficulties in comparing the approach of different groups is the interpretation of the impact that the delay may have on patient outcomes. Unlike triage during wartime or other natural disasters where the timeline for the resumption of services may be clearer, no such guidance exists during the current pandemic. Several groups have indicated that surgical treatment which can be delayed for more than four weeks could and perhaps should be postponed 4 . Others, however, make the argument that delaying care now may simply result in more difficult decisions having to be made later if resources are not immediately made available 5 . While the decision to proceed with surgical care for those patients with acute neurological injury such as cervical myelopathy or metastatic epidural spinal cord compression may be clear, measuring this impact in other spinal pathology such as lumbar stenosis is far more difficult to interpret 19 . This presents the spine surgeon with a situation of significant moral hazard as they feel pressure to advocate for their own patients. Formal structured and objective guidelines which are highly responsive are required to resolve these difficult conflicts and ethical dilemmas 15 .

In their paper "Spine surgery in Italy in the COVID-19 era: Proposal for assessing and responding to the regional state of emergency", Rispoli et al have introduced several important and novel concepts to address this challenge. These principles were developed as the pandemic took hold in northern Italy. Similar to other authors, they have defined spinal pathologic diagnoses into those which are considered urgent and less urgent. More importantly however, they utilize a so-called heat map technique which is based not only on the hospital occupancy or overall population prevalence of disease but rather a combination of the ICU occupancy by patients suffering with COVID 19 as well as the doubling time in the population at large. While numerous data points are truly required to estimate the trajectory of the novel infectious disease, the authors here attempt to predict the utilization of resources as the pandemic evolves. Understanding that incubation period and hospital length of stay may be impossible to predict over the longer term in the broader population, this approach potentially identifies points in time when the health system may be able to tolerate the added burden of additional elective surgical care 7, 9 .

The novelty of this work is not that it provides any further rationale or refinement of placing spinal pathologies into different categories based on urgency. At the onset of the pandemic, when resources were restricted globally, this factor was the only information required to triage patients. The novel approach discussed in this work is the introduction of a decision-making scheme that is both objective but also measures three factors: 1) the urgency of the clinical problem, 2) the current load on critical care beds, and 3) the predicted future need for resources. The use of parameters such as doubling time and ICU capacity have been used in other epidemiological models 20 . The result is a model with two specific advantages. First, the system is objective rather than discretionary. Secondly, it can more safely predict the potential need for diverting hospital resources away from elective surgery in the near future, and can help policy makers to restart surgical care earlier as doubling time lengthens before a marked reduction in hospital and ICU occupancy can easily be measured. As the restrictions on health care resources are likely to become cyclical periods of opening and closing, this latter benefit is particularly important 21 .

The importance of this type of work cannot be overstated. At the time of writing, many countries are experiencing a resurgence of novel coronavirus infections and many healthcare systems, which had begun to resume normal activity, are once again facing strain 22, 23 . In the early phases of the pandemic, advice to the medical community was abundantly clear to halt all non-essential medical procedures. It is equally clear now, however, that as the pandemic continues to evolve, the treatment (including surgical care) for musculoskeletal conditions such as spinal pathology cannot be postponed indefinitely. The enormous burden of disease for these issues mandates a rational approach to assessing the risk of withholding treatment compared with the potential consequence of impeding the care of those who may become ill in the future with COVID-19 24 . It is likely that it will be years before health systems can return to the prior normal state and public health measures can be completely relaxed. The ability of systems that provide surgical care to remain nimble with an impartial distribution of surgical and nonsurgical resources will be critical to the health of patients and populations.

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