Intra-hospital transport of mechanically-ventilated COVID-19 patients for radiological imaging—developing a protocol to prevent healthcare-associated transmission
Letter to the Editor

Intra-hospital transport of mechanically-ventilated COVID-19 patients for radiological imaging—developing a protocol to prevent healthcare-associated transmission

Hei Man Wong1,2, Norhayati Binte Ahmad3, Ziyahdah Binte Zainuddin3, Samuel Junyang Zhang4, Pinhong Jin2, Kwee Yuen Tan2, Yvonne Fu Zi Chan1, Moi Lin Ling2, Thuan Tong Tan1

1Department of Infectious Diseases, Singapore General Hospital, Singapore; 2Department of Infection Prevention and Epidemiology, Singapore General Hospital, Singapore; 3Department of Nursing, Singapore General Hospital, Singapore; 4Department of Security, Singapore General Hospital, Singapore

Correspondence to: Dr. Hei Man Wong. The Academia @ SGH. 20 College Rd, Singapore 169856, Singapore. Email:

Received: 28 May 2020; Accepted: 16 September 2020; Published: 25 December 2020.

doi: 10.21037/jphe-20-49

The 2019–2020 coronavirus pandemic is an ongoing pandemic of coronavirus diseases (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The spectrum of symptomatic infection ranges from mild to critical with respiratory complications comprising of pneumonia and acute respiratory distress syndrome. Up to 5% of patients have critical illness presenting with respiratory failure, shock or multiorgan failure requiring admission to an intensive care unit (ICU) (1). In an Italian series, 88% of critically ill patients admitted to the ICU required mechanical ventilation (2).

Advanced imaging such as computed tomography (CT) of the thorax is clinically valuable in establishing a diagnosis and for guiding triage and management of COVID-19 pneumonia and its pulmonary complications (3). Given the high cumulative incidence of thrombotic complications in critically ill ICU patients with COVID-19 such as acute pulmonary embolism, ischaemic stroke, myocardial infarction and systemic arterial embolism, other imaging modalities such as CT pulmonary angiography and magnetic resonance imaging (MRI) of the brain are essential in diagnosing these complications (4). According to researchers at the Center for Infectious Disease Research and Policy (CIDRAP), COVID-19 pandemic could last for 2 years until 2022 (5). Together with the ongoing global spread of SARS-CoV-2, a significant increase is expected in the number of imaging studies ordered for the management of COVID-19 patients. Therefore, the number of intra-hospital transport for such intubated patients is expected to increase over time.

The values of these scans have to be weighed against the potential harms and costs, such as the risk of radiation exposure to the patient, consumption of personal protective equipment (PPE) and the need for cleaning and downtime of radiology rooms during resource-constrained period. Most importantly, the risk of healthcare-associated transmission to healthcare workers and passersby during transportation for scans needs to be taken into consideration.

Aerosol and fomite transmission of SARS-CoV2 is plausible, since the virus can remain viable and infectious in aerosols for hours and on surfaces up to days (6). Notably, intra-hospital transport has been suggested as a potential risk factor for healthcare-associated transmission for the accompanying healthcare workers and surrounding passersby who might potentially be exposed to the transported patient (7). Dislodgement of endotracheal tubes or ventilator circuit tubings during the transfer may potentially aerosolise the virus contributing to airborne transmission. Similarly, transmission via the contact route may also occur through fomites in the immediate environment around the transported patient with COVID-19 during the transportation for scans.

Transport-related risks can be reduced by increased awareness and education, adequate manpower and logistics arrangement, proper choice and handling of equipment and simulation of high-risk patient transfers. The use of full PPE such as N95 masks, face shield, gowns and gloves by the transport team cannot be overstated. The use of error-preventive tools like checklists and protocols for patient transfers could also be utilized in healthcare facilities to ensure patients and healthcare workers’ safety.

In Singapore General Hospital, preventing healthcare-associated spread of COVID-19 has always been our priority to safeguard the health and safety of our patients and healthcare workers. On top of the routine isolation of suspected cases of COVID-19 using a dynamic case definition defined by the epidemiological risks (e.g., travel, positive case and cluster contact history), the relevant presenting symptoms (e.g., symptoms of acute respiratory illness and anosmia) and clinical syndromes (e.g., acute febrile respiratory illness and pneumonia), hospital-wide social distancing measures are also instituted to mitigate the risk of healthcare-associated transmission (8).

Acknowledging the potential risk of healthcare-associated transmission of COVID-19 during the transportation of intubated patients for radiological imaging and its devasting impact, we have also developed a protocol for this purpose unique to the workflow within our hospital. The principles in developing such a protocol is described in the table below (Table 1).

Table 1
Table 1 Considerations in developing a protocol for the intra-hospital transport of an intubated COVID-19 patient for radiological imaging
Full table

In general, such protocol integrates a multidisciplinary effort involving manpower from various medical, nursing and ancillary support teams, a precise and comprehensive plan and the utilisation of appropriate infection prevention equipment. The major stakeholders involved in such protocol should be familiarised with the transfer process and have undergone simulations before the actual transportation of the intubated COVID-19 patients. The work instructions and co-ordination need to be clear, specific and concise, as well as easy enough to be understood and complied with.

In conclusion, the demand for advanced imaging for COVID-19 is growing given the ongoing global spread and the increasing recognition of its associated complications. Hospitals need to be prepared for the increasing numbers of intra-hospital transport of such intubated patients with COVID-19. A protocol for this purpose is paramount to prevent healthcare-associated transmission. Such protocol represents the determined efforts of the hospital to safeguard the health and safety of its patients and healthcare workers. By sharing our experience of developing such a protocol, we hope that other institutions may benefit from the practical experiences we have gathered since the start of this pandemic.


The authors would like to acknowledge all our colleagues in the Singapore General Hospital who have contributed during this COVID-19 pandemic and in particular the development of our hospital’s transport protocol for the mechanically-ventilated COVID-19 patients.

Funding: None.


Provenance and Peer Review: This article was a free submission to the journal. The article did not undergo external peer review.

Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at The authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See:


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doi: 10.21037/jphe-20-49
Cite this article as: Wong HM, Ahmad NB, Zainuddin ZB, Zhang SJ, Jin P, Tan KY, Chan YFZ, Ling ML, Tan TT. Intra-hospital transport of mechanically-ventilated COVID-19 patients for radiological imaging—developing a protocol to prevent healthcare-associated transmission. J Public Health Emerg 2020;4:41.