key: cord-0948106-0kaub8rz
authors: Liang, Zhen Chang; Chong, Mark Seng Ye; Sim, Ming Ann; Lim, Joel Louis; Castañeda, Pablo; Green, Daniel W.; Fisher, Dale; Ti, Lian Kah; Murphy, Diarmuid; Hui, James Hoi Po
title: Surgical Considerations in Patients with COVID-19: What Orthopaedic Surgeons Should Know
date: 2020-04-24
journal: J Bone Joint Surg Am
DOI: 10.2106/jbjs.20.00513
sha: a48de916da9694f3cbed4bce14769760b0a4e564
doc_id: 948106
cord_uid: 0kaub8rz

nan

mize the risk of nosocomial infections. In this article, we share important surgical considerations and protocols when operating on orthopaedic patients who have suspected or confirmed COVID-19 infections. These guidelines have become more pertinent and useful as we battle a resurgence of COVID-19 infections in Singapore, imported largely from local residents returning to our shores from COVID-19 hotspots 2 . We believe that these guidelines should be an integral part of every orthopaedic surgeon's armamentarium as we brace ourselves for an unrelenting battle with COVID-19. Previously 1 , we described 3 main overarching principles for any operation during this pandemic, namely (1) clinical urgency, (2) patient and health-care worker protection, and (3) conservation of health-care resources. These principles remain unchanged when managing high-risk patients with COVID-19 or those with suspected COVID-19. Adherence to strict guidelines in the perioperative period is required to mitigate against inadvertent occupational exposure to COVID-19. Effective surgical management of patients with COVID-19 mandates a collaborative effort across services and disciplines from porter and security staff to our nursing and anesthesiology colleagues. Precautions that are taken before and after anesthetic induction are crucial in the prevention of COVID-19 transmission to the surgical team. Any lapse potentially can result in the entire surgical team being compromised, with profound repercussions.

In the preoperative setting, the rationalizing of the indications, timing, and location in which a surgical procedure is to be performed is of primary importance (Fig. 1) . Where possible, patients should be managed conservatively without unduly compromising clinical care 3 . Most upper-limb fractures, including clavicle, humeral, and wrist fractures, have high rates of union and can be managed conservatively 4-7 , although some patients may eventually require late reconstruction 8 . Even in the lower extremity, the nonoperative management of tibial fractures can be considered 9, 10 . Ligamentous injuries of the knee can also be managed with bracing in preference to early ligament reconstruction 11, 12 .

When a surgical procedure is indicated, deciding on the optimal timing of a surgical procedure is crucial. This is where our first principle of clinical urgency applies. In our institution, COVID-19 tests are processed by the laboratory 4 to 5 times a day, and it takes, on average, 4 hours before results are known. In extremely urgent cases in which a 4-hour wait for COVID-19 results may not be tenable, surgical procedures proceed with the surgical team donned in full protective gear. This consists of the N95 mask, goggles, caps, shoe covers, gowns, and gloves. Powered air-purifying respirators (PAPRs) are worn if involvement in aerosol-generating procedures is anticipated. Emergency cases include patients with life and limb-threatening injuries (e.g., high-grade open fractures with gross contamination, fractures with vascular compromise or compartment syndrome, cauda equina, or infections such as necrotizing fasciitis). In less urgent cases, patients are conscientiously evaluated to rule out the presence of concomitant COVID-19 infection. When suspicion arises, we should have a low threshold for performing COVID-19 swab tests. In our institution, guidance on the decision to perform COVID-19 swab tests may also be sought from our dedicated COVID-19 infectious diseases team, 24 hours a 3, 2020 day, 7 days a week. This is in line with our second principle: patient and health-care worker protection. Within a permitted surgical time frame, we should strive to ensure that COVID-19 swab results are known before proceeding with a surgical procedure. As health-care resources are being stretched, it is imperative that orthopaedic surgeons, in each institution, come to a consensus with regard to the urgency of orthopaedic cases. What defines essential and nonessential orthopaedic surgery 13 ? Examples of essential urgent cases include epidural abscesses, spinal trauma with neurological deficits, and grossly contaminated open fractures. Nonessential surgical procedures would include benign bone tumors (e.g., osteochondroma) and chronic degenerative joint disease. There is no cookie-cutter, 1-size-fits-all approach, and these definitions need to be reviewed regularly, with adjustments tailored to each hospital's manpower and COVID-19 situation.

In patients with COVID-19, the decision to operate should also be based on the patient's clinical status, in particular his or her respiratory function. A fine balance needs to be struck between mitigating potential fracture-related complications (e.g., fat embolism from long bone fractures 14 ) with worsening of respiratory function in patients who are COVID-19-positive from the added stresses of anesthesia and an expedient surgical procedure. In some instances, patients with fractures that would usually require surgical fixation may need to be treated conservatively until they are fit enough for a surgical procedure at a later date.

Surgical procedures that can reasonably be performed by the bedside may be carried out in the isolation ward in full personal protective equipment (PPE). Examples include the bedside debridement and irrigation of grade-I open fractures in pediatric patients. This has been demonstrated to be effective in reducing infection rates 15 . In managing patients preferentially by the bedside instead of the OR, we minimize inadvertent exposure of staff to COVID-19.

Once the decision, timing, and location of the surgical procedure have been decided, surgical planning starts right from when the patient is transferred from the isolation ward to the OR. Each step needs to be planned and performed methodically in the preoperative, intraoperative, and postoperative settings to avoid inadvertent COVID-19 exposure (Fig. 2) . Surgical masks need to be worn for all nonintubated patients during the transfer process, and it is mandatory for all staff accompanying patients to be wearing full PPE including N95 masks, visors, or goggles. For intubated patients coming from the intensive care unit, a dedicated transport ventilator must be used. Staff must be mindful to clamp endotracheal tubes when changing ventilators during the transfer process to avoid aerosolization. A specific route that is the most direct and least crowded must be taken from the isolation ward to the OR. This route, including elevators, must be clearly sign-posted and cleared by security staff prior to transfer.

It is preferable for dedicated isolation ORs with separate access to be used for patients with COVID-19. These ORs should each have a separate air-conditioning and humidifica-tion unit with individual atmospheric air inlet and exhaust systems. In our institution, this takes the form of 5 interconnecting rooms of which the OR itself and the preparation and scrub rooms are positively pressurized and allow for 20 air changes per hour. This is aimed at reducing surgical site infections 16 . The anterooms and induction rooms are negatively pressurized; the anteroom is used for the donning and removal of PPE including PAPRs. Because of the availability of a negative-pressure anteroom, we have elected to keep the OR itself positively pressurized. When a negative-pressure anteroom is not available, it may be advisable to operate in neutral or negative pressure, as recommended by some jurisdictions. Improvisations can even be made to modify existing ORs, as was done locally in Tan Tock Seng Hospital in Singapore during our severe acute respiratory syndrome (SARS) crisis in 2003 17 . All doors that led into the OR were locked and were sealed with tape. Existing pressure-relief valves opening from the OR into the corridors and adjacent rooms were sealed. In this way, the induction room was converted to effectively function as an anteroom and air lock. It is extremely important that orthopaedic surgeons have a thorough knowledge of the airflows within their specific ORs to minimize the risk of infection to both themselves and their surgical teams.

Similar to SARS, COVID-19 is predominantly spread through respiratory droplets 18 . Aerosol transmission can also occur from exposure to elevated aerosol concentrations in enclosed spaces 19 (e.g., during intubation). Staff who performed aerosol-generating procedures such as endotracheal intubations were 6.6 times more likely to be infected compared with staff who did not 20 . In light of this, if there are no contraindications, we would advocate for the use of regional anesthesia techniques. Central axial or peripheral nerve blockades are effective for the majority of orthopaedic procedures and can potentially reduce aerosolization and transmission of COVID-19 droplets, can avoid worsening existing COVID-19-related respiratory compromise due to general anesthesia, and can prevent postoperative nausea and vomiting [21] [22] [23] . After a regional blockade, surgical masks must be placed on patients at all times. Careful attention must also be given to placing nasal prongs under the patients' surgical masks if sedation is concurrently administered to minimize aerosolization. This further mitigates the risk of surgical teams being exposed to COVID-19 droplets during the surgical procedure itself.

In the event that airway manipulation is deemed necessary (e.g., from surgical necessity or failure of regional blockade), all personnel involved in intubation must don full PPE including PAPRs 24, 25 . Induction and reversal should only take place within the main OR, where COVID-19-dedicated anesthesia machines are located. All potentially required drug and airway equipment is taken from the main drug trolley and is placed in the OR in dedicated trays. A separate, fully stocked drug and airway trolley is also available in the induction room. If additional drugs or equipment are required urgently, the anesthetic nurse may change gloves and gown and perform hand hygiene before entering the induction room and retrieving the items.

Staff not involved in intubation (including the orthopaedic surgical team) should stay at least 2 m away, preferably e50 (3) outside the OR. Aerosol generation must be minimized with specific anesthetic interventions (e.g., rapid sequence induction, avoidance of high-flow nasal cannulas and bag valve mask ventilation, proper securing of endotracheal tubes to avoid air leaks, and minimizing patient coughing on emergence) 26, 27 . Laryngeal mask airways are avoided for these patients, given their high propensity for leaking and absence of a closed circuit 28, 29 . These recommendations have been adopted against the backdrop of evidence supporting dispersion of droplets from exhaled air up to 30 cm away with the use of bag valve mask ventilators and up to 1 m away with coughing 30 . All anesthetic interventions should be completed before the surgical team enters the OR for patient positioning and the subsequent surgical procedure.

Along with the routine surgical timeout, it is extremely important that a team huddle takes place prior to a surgical procedure to familiarize the surgical team with the anesthetic and surgical plans. This ensures that all necessary drugs and equipment are prepared and minimizes unnecessary movement into and out of the OR to bring in additional drugs or implants. This is even more pertinent given potential difficulties with communication intraoperatively after the donning of PPE and PAPR.

Intraoperatively, the surgical team should accordingly be divided into 2 main teams: (1) a "contaminated team" with direct patient contact (donning, at the minimum, N95 masks with full PPE including at least goggles and with PAPRs preferable when performing aerosol-generating procedures), and (2) a "clean team" providing ancillary support to deliver equipment and instruments to and from the contaminated team should the need arise. Equipment will be left in the anteroom for the contaminated team to retrieve. The same process in reverse will be used when sending out specimens. This will be particularly pertinent in musculoskeletal tumor surgical procedures in which frozen sections are commonly sent intraoperatively for histopathological review. A dedicated infection control nurse with the chief responsibility of ensuring that all infection control measures within the OR are strictly adhered to should be deployed. This nurse is also responsible for supervising the appropriate donning and doffing of PPE and the decontamination and sterilization of used instruments and equipment. This is particularly pertinent given the risk of self-contamination during the doffing process 31, 32 . All contact episodes between staff and patients are conscientiously recorded, so that contact tracing and isolation efforts can be facilitated expediently if required. The movement of patients and the anesthetic and surgical staff into and out of the OR complex needs to be tightly regulated to ensure health-care worker and patient protection and to minimize nosocomial COVID-19 spread (Fig. 3) .

As far as possible, disposable instruments, equipment, and drapes should be used. Intraoperatively, surgical times should be kept as short as possible and teams should be kept as small as possible. Resident training is secondary to the imperative that surgical procedures are performed as expediently as possible by the most experienced surgeon to shorten surgical times 33 . As orthopaedic surgeons, we can undertake specific orthopaedic interventions to mitigate our intraoperative risk of inadvertent COVID-19 exposure. General PPE and PAPR guidelines must be strictly adhered to. The donning of space suits with open fan systems is not recommended because of the potential risk of drawing contaminated submicron particles into the suit system 34 .

Sporadic reports have emerged raising concerns of the potential airborne transmission of COVID-19 19 . COVID-19 aerosols have been reported to be able to linger in the air for up to 3 hours 19 . However, conflicting articles have also demonstrated the absence of COVID-19 RNA in air samples 35, 36 . Although the World Health Organization (WHO) still recommends precautions against droplets and contact, the U.S. Centers for Disease Control and Prevention (CDC) has recommended additional precautions against airborne transmission for any situation involving the care of patients with COVID-19 37 . The nature of our job entails the frequent handling of power tools such as high-speed drills and hammers and sharp equipment such as reamers and Kirschner wires 38,39 . Direct contact with infectious secretions, even blood, can potentially predispose one to COVID-19 infection 30 . High-speed drilling and blood spatters can potentially exacerbate the aerosolization of COVID-19. Although this theory still remains unproven, we would do well to err on the side of caution. Practical pointers to reduce blood and fluid splatter include the placement of transparent plastic covers over wounds when drilling and minimizing the use of pulsatile lavage 40 . When possible, to minimize surgical times, we should consider surgical approaches and strategies in which we are most confident and with which we are familiar. For some surgeons, this may involve opting for replacement over fixation options, particularly when operating on complex fractures in elderly patients 41, 42 . Replacement allows for immediate weightbearing postoperatively. This facilitates rehabilitation and minimizes further complications (e.g., urinary tract infections) from prolonged bed rest in patients with COVID-19 43, 44 . When managing fractures (both closed and open), definitive external fixation should be considered given their minimal invasiveness and the relative ease in performing them [45] [46] [47] . The judicious choice of implants is of utmost importance as well. Uncemented implants (e.g., in bipolar hemiarthroplasties) and unreamed nails should be considered given their shorter surgical timings and potential advantage in reducing respiratory complications in patients who are infected with COVID-19 and have respiratory compromise. In doing so, we can potentially avoid inducing further cardiorespiratory insult from bone cement implantation syndrome 48, 49 and fat embolism during reaming 50, 51 . By taking these precautions, we protect both ourselves and our patients during surgical procedures.

Postoperatively, surgeons should remove and discard their used gowns, shoe covers, and gloves in the negative-pressure anteroom and should perform hand hygiene before leaving the anteroom. PAPRs (if used), N95 masks, and goggles are removed outside the anteroom on departure from the OR. PAPRs are placed in a dedicated area for disinfection. All staff should also shower prior to leaving the OR complex 16 . Patients should recover within the OR itself and should be brought back to the isolation ward directly from the OR by the same dedicated porter team. This is different from the routine practice in which patients are first recovered in the post-anesthesia care unit (PACU) and are brought back to their wards by a common pool of porter staff 17 . Again, the route back to the isolation ward should be cleared by the hospital security team, and a face mask should always be placed on the patient prior to transfer. Patients should be given regular antiemetics (e.g., ondansetron to reduce postoperative nausea and vomiting), hence minimizing potential aerosolization. Fang et al. reported in The Lancet Respiratory Medicine that the consumption of nonsteroidal anti-inflammatory drugs (NSAIDs) (e.g., ibuprofen) can potentially worsen symptoms in patients with COVID-19 52 . This is attributed to their increased expression of angiotensin-converting enzyme 2 (ACE-2), which enables SARS-CoV-2 (the coronavirus responsible for COVID -19) to bind to its target cells in the lungs 53 . This theory is still highly controversial and is as yet unproven. However, it might be prudent to opt for alternative classes of analgesia when managing patients with COVID-19.

A minimum of 1 hour should be planned between cases to allow for OR staff to properly decontaminate the OR and all equipment. Studies have shown that human coronaviruses (e.g., SARS-CoV-2) can persist on inanimate surfaces but can be effectively inactivated by surface disinfection procedures, such as 70% ethanol or 0.5% hydrogen peroxide [54] [55] [56] . In our institution, we routinely disinfect all medical devices, surfaces, and OR equipment with quaternary ammonium chloride disinfectant wipes. The OR is cleaned with sodium hypochlorite; this is followed by hydrogen peroxide vaporization as an added precaution 16, 57 .

In the surgical and perioperative management of patients with COVID-19, the general principles of clinical urgency, patient and health-care worker protection, and conservation of healthcare resources need to be similar applied in the preoperative, intraoperative, and postoperative settings to minimize inadvertent COVID-19 occupational exposure. We need to be cognizant of specific nuances with regard to orthopaedics when surgically managing patients with COVID-19. Among these include the consideration of uncemented and unreamed implants to avoid respiratory compromise, and the employment of surgical strategies with which one is most familiar and in which one is most confident to shorten operative times. In addition to surgical precautions, abiding by strict peri-anesthetic precautions is equally, if not more, important. As orthopaedic surgeons, we are leaders of the surgical team. It is imperative that we familiarize ourselves with the key considerations as discussed, to ensure the safety of ourselves, our surgical team members, and our patients as we battle this COVID-19 pandemic while delivering the most effective care for our patients. n 

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