Biosafety procedures for handling intraoperative surgical samples during COVID-19 pandemic: an Italian pathology laboratory experience
Up to now, Italy is one of the European centers with the most active Coronavirus cases with 233,836 positive cases and 33,601 total deaths as of June 3rd. During this pandemic and dramatic emergency, Italian hospitals had also to face neoplastic pathologies, that still afflict the Italian population, requiring urgent surgical and oncological treatment. In our Cancer Center Hospital, the high volume of surgical procedures have demanded an equally high volume of intraoperative pathological examinations, but also posed an additional major challenge for the safety of the staff involved. The current commentary reports our experience in the past two months (since March 9th) for a total of 1271 frozen exams from 893 suspect COVID-19 patients (31 confirmed).
As is know, a novel viral pandemic, driven by the 2019-nCoV, also known as severe acute respiratory syndrome Coronavirus 2 (SARS-CoV-2), started from the initial epicenter in Wuhan (China) and spread all over the world with dramatic healthcare consequences 1,2. On January 31st 2020, the number of positive patients in Europe and mostly in Italy significantly increased. Then the infection rapidly spread in Northern Italy where 11 municipalities were placed under quarantine. On March 9th 2020, given the persistent and steep increase in deaths and positive cases, the Italian Prime Minister, Giuseppe Conte, imposed a lockdown on all of Italy and placed more than 60 million people in quarantine. Up to now, Italy is one of the European centers with the most active Coronavirus cases with 233,836 positive cases and 33,601 total deaths as of June 3rd. The pandemic growth congested Italian hospitals with symptomatic patients and turned most medical and paramedical staff to this dramatic emergency 3,4 .
At the same time, unfortunately, neoplastic pathologies, requiring urgent surgical and oncological treatment continue to affect Italian population. Our hospital, Policlinico Gemelli (Rome, Italy), represents one of the biggest Italian referral centers for oncological patients, including also a large number of gynecological cancers. The high volume of surgical procedures demanded an equally high volume of intraoperative pathological examinations (frozen) but posed an additional major challenge for the safety of the staff involved. In agreement with Internal and National guidelines for biosafety in containing the pandemic spread, our pathology laboratory adopted further safety procedures for processing fresh surgical samples from suspect patients who are also affected by severe neoplastic pathologies. The current commentary reports our experience in the past two months (since March 9th) for a total of 1271 frozen exams from 893 suspect COVID-19 patients (31 confirmed with PCR). Patients characteristics and frozen section details are summarized in Table I. It is mandatory to ensure that all the possible biosafety conditions are met for the medical and technical staff involved in this procedure.
According to the recent WHO recommendations, all samples sent to the histopathology laboratory should be considered as potentially infectious 5. Moreover, the Centers for Disease Control and Prevention (CDC) released an Interim Laboratory Biosafety Guidelines for Handling and Processing Specimens Associated with Coronavirus Disease 2019 (COVID-19) 6 .
Adapting the indication from both guidelines, we developed an internal protocol for intraoperative examination of fresh specimens from patients with suspect or proven COVID-19 infection in order to reduce the risk for laboratory personnel.
We defined the following internal protocol for the management of frozen exams.
Frozen section Room and intraoperative examination
Instructions for PPE removal
All possible sources of infection while removing PPE should be avoided; therefore an adequate procedure must be adopted by the healthcare operators. Please consider the following order of actions:
Removed PPE must be placed outside the FSR in dedicated areas ensuring the virus is not transmitted to the healthcare worker.
The COVID-19 epidemic has not yet shown signs of receding despite a recent apparent drop in the number of new cases. In fact, starting on May 4th, Italy entered in Phase two, and relaxed the lockdown, similar to other European countries. We retain that our laboratory protocols were useful to control and limit the possibilities of infection in personnel. In fact, to date, no infected workers have been recorded in our unit. Moreover, despite all adopted biosafety procedures, the mean time of intra-operatory diagnosis was 29.38 minutes (range 17-49 minutes). Therefore, if the personnel is well trained, our suggested protocols are able to ensure a good balance between laboratory security and rapid diagnostic times.
In our opinion, also in phase two, we must not lower our and evaluation of intraoperative surgical samples should still be limited to what is strictly necessary. Our protocol together with the current guidelines 5-8 may provide further safety for pathology laboratory workers and prevent infection diffusion. Although the pathologist has limited direct contacts with patients, the intraoperative exam of fresh, potentially infected specimens carries high infectious risk and needs to be performed in safe conditions. The resiliency of our universal healthcare system is based on the strength on the safety of all the system components for the best possible patient care in conditions of stress.
Figures and tables
|Total no. of patients||893|
|Number of COVID-19 + patients||31|
|Median age of patients||52|
|Total no. of intraoperative exams||1271|
|Total no. of intraoperative exams according to anatomical site|
|Central nervous system||25|
|Head and neck||208|
|Female genital system||450|
|Mean time of diagnosis||29.38 minutes (range 17-49 minutes)|
|EU FFP2 facial mask for residents/physician and lab technician Surgical mask for lab technician, accepting and registering the sample Disposable long sleeves fully covering the forearms Waterproof coats, solid-front/wrap-around gowns / scrub suits or coveralls Head coverings Disposable double pair of nitrile gloves Protective eye-goggles or face-shield Disposable head caps Disposable long shoe covers or dedicated shoes Alcoholic hand hygiene solution|
|Clean with chloro-derivate solution Rinse and dry Disinfect with 99% ethanol and chloro-derivate solution at 0.5%|