[Multicenter, triple-blind randomized placebo controlled trial of adjuvant nitrous oxide 50% in oxygen 50%: efficacy for reducing pain and increasing satisfaction in patients treated for renal colic in the emergency department].

Objectives: To assess the efficacy of a nitrous oxide and oxygen mixture (N2O/O2 50/50) for reducing pain and increasing satisfaction in patients with an initial clinical diagnosis of renal colic in the emergency department.

Material And Methods: Multicenter, triple-blind randomized placebo-controlled trial. We randomized 147 patients with a clinical diagnosis of renal colic to an experimental group to receive the N2O/O2 50/50 mixture (n = 70) or a control group to receive 50% oxygen in air (n = 77).

[Frequent attenders in Primary Health Care Centres and frequent attenders in Emergency Departments].

Objective: To identify predictors of frequent attenders (HF) in Primary Health Care (PHC) centres in a sample of frequent attenders (HF) in Emergency Departments (ED).

Design: This was an observational, retrospective, multicentre cohort study.

Participants: The HF patients were selected from patients seen in the ED between January 1 and December 31, 2013.

[Frequent users in paediatric emergency departments. Who are they? Why do they consult?].

Objective: To determine the prevalence of frequent Paediatric Emergency Departments users and to analyse their characteristics, comparing initial consultations and re-consultations.

Methods: This is a multicentre retrospective cohort study of all patients who made 10 or more visits to the Paediatric Emergency Departments of 5 public hospitals between 1 January 2013 and 31 December 2013. An analysis was performed on the patient demographics and clinical data of the first consultation and consecutive re-consultations.

[Loyal frequent users of hospital emergency departments: the FIDUR project].

Objectives: To describe the characteristics of frequent users of hospital emergency departments and analyze whether characteristics varied in relation to how revisits were distributed over the course of the year studied.

Material And Methods: Retrospective study of patients over the age of 14 years who were treated in a hospital emergency department at least 10 times in 2013. Patients were identified in 17 public hospitals in the Spanish autonomous community of Madrid.