Characteristics of helicopter hoist operations with intubated patients: a retrospective analysis of a Norwegian physician staffed SAR helicopter service.

Abstract

Background: Timely medical management and evacuation of critically ill or injured patients from austere environments or maritime vessels is often achieved by helicopter hoist operations. When indicated, intubation is performed onsite to restore and sustain patient physiology and to facilitate safe transport. We aimed to describe the characteristics of helicopter hoist operations (HHOs) with intubated patients in a physician staffed SAR helicopter service and to identify learning points for future missions.

Methods: The Norwegian national SAR database and local medical journal systems on six SAR helicopter bases were searched for data on hoisted intubated patients from January 2011 to April 2024.

Results: From a total of 18,710 missions, we registered 2,423 helicopter hoist operations with patients as human external cargo. In 54 hoist operations (2%) the patients were intubated prior to hoisting. We observed an increasing number of both HHOs in general and HHOs with intubated patients over time. The intubated HHO patients were in an overall critical state, with a median NACA score of 6 and a median GCS of 3 before intubation. Trauma was the main cause of intubation (n = 32). Twenty-five patients presented with cardiac arrest, 13 of whom were hoisted with an ongoing mechanical chest compression device. During the hoist operation, 34 patients were ventilated manually, and 20 patients were connected to an automatic ventilator. Monitoring of vital parameters during hoisting varied from none to fully monitored patients including invasive arterial blood pressure. Twenty-eight patients, seven of whom presented with initial cardiac arrest, survived to hospital discharge.

Conclusions: HHOs with intubated patients are rare but increasingly occurring events in our service. Owing to the infrequency, complexity and risk factors involved, these operations should be governed by specific operating procedures and trained regularly to be performed safely. HHOs with intubated patients represents a favourable alternative in situations where terrestrial transport is associated with significant time delay or additional risk to the patient or the rescuers.