We evaluated the effectiveness of a new, anticipatory, multidisciplinary care service in improving the wellbeing and quality of life for older people living with severe frailty. This study showed that the new service improved wellbeing and quality of life for this study population at 2-4 weeks; the improvement in wellbeing was sustained at 3 months. We chose a short observation time because we expect the benefit from improved symptom control and additional support will have maximal effect at 2-4 weeks. The improvement in wellbeing and quality of life associated with the new integrated care service is greater than that previously reported as clinically meaningful by patients with advanced illness [10, 18].
Choosing the right primary outcome measure is important; we found greater change in wellbeing (measured with IPOS) than in quality of life (measured with EQ-5D-5L). IPOS can detect clinically meaningful changes in symptoms and other concerns over time, and is more specific to the concerns of those with advanced illness. Quality of life, in contrast, is subject to a much wider range of influences. The domains included in IPOS are those prioritised as most important by patients with advanced illness themselves [10]. In this study population, the reported symptoms and other concerns may be linked to multiple long-term conditions, the progression of those conditions, to overall deterioration in health, or to management of health conditions [10]. IPOS can be used to capture wellbeing, to reflect the effectiveness of healthcare interventions, and to indicate care quality; it has good construct validity with three underlying factors: physical symptoms, psychological symptoms, and communication/practical issues [10].
We used a Comprehensive Geriatric Assessment (CGA)-based intervention – a multi-modal screening and treatment approach that identifies the medical, psychological and functional needs of older adults [19]. Multi-modal interventions are more likely than uni-modal interventions to improve health outcomes and to decrease frailty and depression in older people [19]. Our findings are consistent with another integrated care service (multi-disciplinary team meetings) evaluation which showed reduced rates of functional decline, emergency room visits and unnecessary hospitalisation among older people [20] . Use of CGA can improve physical and cognitive function, and reduce mortality and emergency hospitalisations [21], not only for older people in the hospital setting but also those in the community setting [22, 23]. CGA has also been shown to reduce the prevalence of frailty [24] which may be one of the mechanisms explaining our sustained benefit over time. In a realist review which assessed the use of CGA in improving health-related quality of life, findings showed that the use of CGA improved patient outcomes such as physical and cognitive function, reduced mortality and emergency hospitalisations [19], not only in older people in the hospital setting but also those in the community setting [25, 26]. However, a recent review has shown that there are significant variations in the results from earlier CGA intervention studies [27], and the evidence for effectiveness is low.
Strengths and limitations of the study
This is one of the first studies evaluating the impact of a new, anticipatory, multidisciplinary care service for older people living with frailty on wellbeing as well as quality of life. A major strength is the use of a matched control group, with propensity matching to adjust for baseline differences. This demonstrates the course of the patients’ outcomes and supports the relationship between outcomes and intervention [28,29,30]. However, some of the limitations need discussion. First, there were more patients recruited in the intervention group than in the control group. This reflected study limitations during data collection (during the COVID-19 lockdown) and was not planned. Our plan was to recruit an equal number of participants for both groups but unfortunately, because of COVID, this was not possible. Unequal samples in control and intervention groups are not – of themselves – problematic, unless leading to loss of power and/or unequal variance. In this instance, the imbalance was due to accessibility problems related to COVID. We therefore describe the two groups in more detail, especially in relation to functional status and area deprivation scores.
Second, the study groups had baseline differences in functional status and area deprivation scores. This may reflect sampling; those in the intervention group had – by definition – had to be mobile enough to attend the centre, while the control group included those who were house-bound (therefore with poorer functional status). GP practices (and hence areas) were included according to the roll-out of the integrated care service across the district; and selection of GP practices for control group recruitment were constrained by the roll-out (likely contributing to differences in area deprivation scores). However, propensity score matching using functional status and area deprivation scores still showed that the new service was associated with improved patients' wellbeing, and the size of this effect was clinically meaningful [10]. For clinically important questions in observational research, propensity score analysis provides an alternate approach for evaluating causal treatment effects [30,31,32,33]. Any future study should aim to recruit participants with similar baseline characteristics to reduce sampling bias. Third, this study recruited only participants with severe frailty; the service is now extended to include those at risk of moderate frailty. Future studies should be designed to recruit participants from a wider frailty group. Fourth, this was an open trial because the service was an ongoing one, hence the intervention and outcome assessments were not blinded. This could have led to information bias. Any future study should aim to blind the study outcomes.
Research and clinical implications
This study demonstrated that selection of relevant outcome measures as well as careful timing of measurement of primary and secondary outcomes is important in evaluations of interventions in advanced illness. There is a need for wider testing of this model of care in other populations and contexts. The clinical implications for the current findings include the need to consider wider use of this model of care among this population as well as defining the implementation strategies that can help to ensure wider adoption and sustainability of the new service.