Background/Objectives: Unwanted loneliness is the gap between the social relations a person has and those they want. The main objective of this research is to assess the impact of a multidimensional community-based intervention on the feeling of unwanted loneliness in the population over the age of 65 years old who live alone, are under social risk, or are socially isolated living on La Palma island. Methods: A quasi-experimental study was designed with pre- and post-intervention (at three months) measurements, with no control group or randomization. A sample comprising 90 subjects was estimated for a small–moderate (0.3) or large (0.8) effect size, with a significance level (α) of 0.05 and a power (1 − β) of 0.8. Results: The intervention was initiated with 90 participants in 8 of the 9 Basic Health Districts from the La Palma Health Area. A moderate effect size (d = −0.77; 95%CI [−1.02, −0.52]) was evidenced in self-perceived loneliness. Three months after the proposed community-based intervention, significant differences were evidenced in adequate eating habits, physical activity, support network, anxiety, depression, and perceived social support. Conclusions: Compartiendo Salud (Sharing Health) presents promising results, as it exerts positive effects on health management among older adults that live alone. The results of this intervention could serve as a model to design replicable strategies in other communities, improving the quality of life and levels of perceived social support in older adults.

Cardiopulmonary arrests are time-dependent emergencies where survival rates are quickly reduced without early intervention. BLS training programmes for teachers and schoolchildren must be mandatory, as they not only improve efficacy when performing the manoeuvres but also enhance willingness to do so. Background/Objectives: To analyse changes in knowledge and whether they are sustained in time after a theoretical–practical intervention led by nurses. To objectively analyse the quality of chest compressions according to the students’ group and age. Methods: A quasi-experimental study without a Control Group and with three measuring instances: Baseline (T0), Immediate post-intervention (T1) and at three months (T2). Knowledge was assessed by means of an ad hoc questionnaire; in turn, the chest compressions were evaluated using a mannequin with feedback. The longitudinal changes were analysed based on paired discordant answers. Descriptive analyses according to age and schooling level were performed. Results: There were 982, 756 and 509 students at T0, T1 and T2, respectively. A total of 206 records were paired at all three measuring moments. The intervention was associated with an increase in knowledge test scores, which is preserved at three months. Most of the questionnaire items presented positive changes or remained unchanged. The significant difference was maintained in 8 of the 10 questions. As for the compressions, a significant and positive correlation was found between age and overall score, depth and rate. The comparative analysis between the Lower Secondary Education and Higher Secondary Education groups found significant differences in those same variables, as well as a difference in release. Conclusions: Altogether, the results of this study contribute evidence about the effectiveness of BLS training among adolescents in a real-world context, underscoring the need for ongoing and age-adapted interventions.