You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Psychosocial nursing therapy following sudden cardiac arrest : impact on two-year survival . BACKGROUND Although psychosocial therapy has been shown to reduce mortality after myocardial infarction , it is unknown whether the benefits of psychosocial therapy on mortality reduction extend to out-of-hospital sudden cardiac arrest , a main cause of cardiovascular mortality . OBJECTIVE Describe efficacy of psychosocial therapy on two-year cardiovascular mortality in sudden cardiac arrest survivors . METHOD Survivors of out-of-hospital ventricular fibrillation or asystole ( N = 129 ) , documented by electrocardiograms from registries of a citywide Medic One unit and two countywide emergency units , were randomized into a two group , experimental , longitudinal design . The intervention consisted of 11 individual sessions , implementing three components : physiologic relaxation with biofeedback training focused on altering autonomic tone ; cognitive behavioral therapy aimed at self-management and coping strategies for depression , anxiety , and anger ; and cardiovascular health education . The primary outcome measure was cardiovascular mortality . RESULTS Risk of cardiovascular death was significantly reduced 86 % by psychosocial therapy , p = .03 . Six of the seven cardiovascular deaths in the control group were caused by ventricular arrhythmias . The cardiovascular death in the therapy group was due to stroke . Controlling for depression , previous myocardial infarction , low ejection fraction , decreased heart rate variability , and ventricular ectopic beats had little impact on estimated treatment effect . The risk of all-cause mortality was reduced by 62 % in the therapy group , p = .13 . There were a total of three deaths in the therapy group and eight deaths in the control group . CONCLUSIONS Psychosocial therapy significantly reduced the risk of cardiovascular death in sudden cardiac arrest survivors .
{"Intervention": ["Psychosocial nursing therapy", "control", "cognitive behavioral therapy", "psychosocial therapy", "Psychosocial therapy"], "Outcome": ["cardiovascular mortality", "two-year survival", "deaths", "Risk of cardiovascular death", "mortality reduction", "cardiovascular deaths", "mortality", "The cardiovascular death", "cardiovascular death", "risk of all-cause mortality", "depression , previous myocardial infarction , low ejection fraction , decreased heart rate variability , and ventricular ectopic beats"], "Participant": ["sudden cardiac arrest survivors .", "129", "following sudden cardiac arrest :"]}