Critical Illness Clinical Trial
Official title:
Measuring Heart and Lung Function in Critical Care: A Feasibility Study to Assess the Use of a Novel Device to Monitor Cardiorespiratory Function in Mechanically Ventilated Patients in Critical Care.
This is a feasibility study of the use of a novel technique called 'Inspiwave' to measure
heart and lung function in adult patients in critical care.
The preliminary work has already been undertaken in animal models and in healthy volunteers.
The ultimate aim of this study is to develop a clinical tool for measuring (and therefore
being able to make treatment changes based on) indices of heart and lung function in critical
care patients. This study is the first assessment of the technique in this population, and
whilst we know it works in patients undergoing general anaesthesia, we now need to assess
whether Inspiwave can be used at all in critical care patients who may have much more
physiological derangement. The purpose of this phase of the research is to determine whether
it is feasible to use Inspiwave in critical care.
Inspiwave generates a sinusoidally modulated tracer gas signal in the inspired air. It also
measures the resulting signal in the expired air. The unique handling of this signal by the
patient can used be to derive key variables related to cardiopulmonary function such as lung
volume, pulmonary blood flow, the deadspace (wasted ventilation) and the degree to which
ventilation and blood flow are non-uniform. These are 'vital signs' in sick patients, yet are
currently technically difficult to measure, particularly non-invasively.
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