Influence of climate on emergency department visits for syncope

Role of air temperature variability

Andrea Galli, Franca Barbic, Marta Borella, Giorgio Costantino, Francesca Perego, Franca Dipaola, Francesco Casella, Pier Giorgio Duca, Andrè Diedrich, Satish Raj, David Robertson, Alberto Porta, Raffaello Furlan

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Background: Syncope is a clinical event characterized by a transient loss of consciousness, estimated to affect 6.2/1000 person-years, resulting in remarkable health care and social costs. Human pathophysiology suggests that heat may promote syncope during standing. We tested the hypothesis that the increase of air temperatures from January to July would be accompanied by an increased rate of syncope resulting in a higher frequency of Emergency Department (ED) visits. We also evaluated the role of maximal temperature variability in affecting ED visits for syncope. Methodology/Principal Findings: We included 770 of 2775 consecutive subjects who were seen for syncope at four EDs between January and July 2004. This period was subdivided into three epochs of similar length: 23 January-31 March, 1 April-31 May and 1 June-31 July. Spectral techniques were used to analyze oscillatory components of day by day maximal temperature and syncope variability and assess their linear relationship. There was no correlation between daily maximum temperatures and number of syncope. ED visits for syncope were lower in June and July when maximal temperature variability declined although the maximal temperatures themselves were higher. Frequency analysis of day by day maximal temperature variability showed a major non-random fluctuation characterized by a ~23-day period and two minor oscillations with ~3- and ~7-day periods. This latter oscillation was correlated with a similar ~7-day fluctuation in ED visits for syncope. Conclusions/Significance: We conclude that ED visits for syncope were not predicted by daily maximal temperature but were associated with increased temperature variability. A ~7-day rhythm characterized both maximal temperatures and ED visits for syncope variability suggesting that climate changes may have a significant effect on the mode of syncope occurrence.

Original languageEnglish
Article numbere22719
JournalPLoS One
Volume6
Issue number7
DOIs
Publication statusPublished - 2011

Fingerprint

syncope
Syncope
Climate
Hospital Emergency Service
air temperature
Air
climate
Temperature
temperature
oscillation
Health care
Unconsciousness
Climate change
Climate Change
consciousness
pathophysiology
Health Care Costs
health services

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Influence of climate on emergency department visits for syncope : Role of air temperature variability. / Galli, Andrea; Barbic, Franca; Borella, Marta; Costantino, Giorgio; Perego, Francesca; Dipaola, Franca; Casella, Francesco; Duca, Pier Giorgio; Diedrich, Andrè; Raj, Satish; Robertson, David; Porta, Alberto; Furlan, Raffaello.

In: PLoS One, Vol. 6, No. 7, e22719, 2011.

Research output: Contribution to journalArticle

Galli, A, Barbic, F, Borella, M, Costantino, G, Perego, F, Dipaola, F, Casella, F, Duca, PG, Diedrich, A, Raj, S, Robertson, D, Porta, A & Furlan, R 2011, 'Influence of climate on emergency department visits for syncope: Role of air temperature variability', PLoS One, vol. 6, no. 7, e22719. https://doi.org/10.1371/journal.pone.0022719
Galli, Andrea ; Barbic, Franca ; Borella, Marta ; Costantino, Giorgio ; Perego, Francesca ; Dipaola, Franca ; Casella, Francesco ; Duca, Pier Giorgio ; Diedrich, Andrè ; Raj, Satish ; Robertson, David ; Porta, Alberto ; Furlan, Raffaello. / Influence of climate on emergency department visits for syncope : Role of air temperature variability. In: PLoS One. 2011 ; Vol. 6, No. 7.
@article{9f48805d8ef94ae080066dc900ccb114,
title = "Influence of climate on emergency department visits for syncope: Role of air temperature variability",
abstract = "Background: Syncope is a clinical event characterized by a transient loss of consciousness, estimated to affect 6.2/1000 person-years, resulting in remarkable health care and social costs. Human pathophysiology suggests that heat may promote syncope during standing. We tested the hypothesis that the increase of air temperatures from January to July would be accompanied by an increased rate of syncope resulting in a higher frequency of Emergency Department (ED) visits. We also evaluated the role of maximal temperature variability in affecting ED visits for syncope. Methodology/Principal Findings: We included 770 of 2775 consecutive subjects who were seen for syncope at four EDs between January and July 2004. This period was subdivided into three epochs of similar length: 23 January-31 March, 1 April-31 May and 1 June-31 July. Spectral techniques were used to analyze oscillatory components of day by day maximal temperature and syncope variability and assess their linear relationship. There was no correlation between daily maximum temperatures and number of syncope. ED visits for syncope were lower in June and July when maximal temperature variability declined although the maximal temperatures themselves were higher. Frequency analysis of day by day maximal temperature variability showed a major non-random fluctuation characterized by a ~23-day period and two minor oscillations with ~3- and ~7-day periods. This latter oscillation was correlated with a similar ~7-day fluctuation in ED visits for syncope. Conclusions/Significance: We conclude that ED visits for syncope were not predicted by daily maximal temperature but were associated with increased temperature variability. A ~7-day rhythm characterized both maximal temperatures and ED visits for syncope variability suggesting that climate changes may have a significant effect on the mode of syncope occurrence.",
author = "Andrea Galli and Franca Barbic and Marta Borella and Giorgio Costantino and Francesca Perego and Franca Dipaola and Francesco Casella and Duca, {Pier Giorgio} and Andr{\`e} Diedrich and Satish Raj and David Robertson and Alberto Porta and Raffaello Furlan",
year = "2011",
doi = "10.1371/journal.pone.0022719",
language = "English",
volume = "6",
journal = "PLoS One",
issn = "1932-6203",
publisher = "Public Library of Science",
number = "7",

}

TY - JOUR

T1 - Influence of climate on emergency department visits for syncope

T2 - Role of air temperature variability

AU - Galli, Andrea

AU - Barbic, Franca

AU - Borella, Marta

AU - Costantino, Giorgio

AU - Perego, Francesca

AU - Dipaola, Franca

AU - Casella, Francesco

AU - Duca, Pier Giorgio

AU - Diedrich, Andrè

AU - Raj, Satish

AU - Robertson, David

AU - Porta, Alberto

AU - Furlan, Raffaello

PY - 2011

Y1 - 2011

N2 - Background: Syncope is a clinical event characterized by a transient loss of consciousness, estimated to affect 6.2/1000 person-years, resulting in remarkable health care and social costs. Human pathophysiology suggests that heat may promote syncope during standing. We tested the hypothesis that the increase of air temperatures from January to July would be accompanied by an increased rate of syncope resulting in a higher frequency of Emergency Department (ED) visits. We also evaluated the role of maximal temperature variability in affecting ED visits for syncope. Methodology/Principal Findings: We included 770 of 2775 consecutive subjects who were seen for syncope at four EDs between January and July 2004. This period was subdivided into three epochs of similar length: 23 January-31 March, 1 April-31 May and 1 June-31 July. Spectral techniques were used to analyze oscillatory components of day by day maximal temperature and syncope variability and assess their linear relationship. There was no correlation between daily maximum temperatures and number of syncope. ED visits for syncope were lower in June and July when maximal temperature variability declined although the maximal temperatures themselves were higher. Frequency analysis of day by day maximal temperature variability showed a major non-random fluctuation characterized by a ~23-day period and two minor oscillations with ~3- and ~7-day periods. This latter oscillation was correlated with a similar ~7-day fluctuation in ED visits for syncope. Conclusions/Significance: We conclude that ED visits for syncope were not predicted by daily maximal temperature but were associated with increased temperature variability. A ~7-day rhythm characterized both maximal temperatures and ED visits for syncope variability suggesting that climate changes may have a significant effect on the mode of syncope occurrence.

AB - Background: Syncope is a clinical event characterized by a transient loss of consciousness, estimated to affect 6.2/1000 person-years, resulting in remarkable health care and social costs. Human pathophysiology suggests that heat may promote syncope during standing. We tested the hypothesis that the increase of air temperatures from January to July would be accompanied by an increased rate of syncope resulting in a higher frequency of Emergency Department (ED) visits. We also evaluated the role of maximal temperature variability in affecting ED visits for syncope. Methodology/Principal Findings: We included 770 of 2775 consecutive subjects who were seen for syncope at four EDs between January and July 2004. This period was subdivided into three epochs of similar length: 23 January-31 March, 1 April-31 May and 1 June-31 July. Spectral techniques were used to analyze oscillatory components of day by day maximal temperature and syncope variability and assess their linear relationship. There was no correlation between daily maximum temperatures and number of syncope. ED visits for syncope were lower in June and July when maximal temperature variability declined although the maximal temperatures themselves were higher. Frequency analysis of day by day maximal temperature variability showed a major non-random fluctuation characterized by a ~23-day period and two minor oscillations with ~3- and ~7-day periods. This latter oscillation was correlated with a similar ~7-day fluctuation in ED visits for syncope. Conclusions/Significance: We conclude that ED visits for syncope were not predicted by daily maximal temperature but were associated with increased temperature variability. A ~7-day rhythm characterized both maximal temperatures and ED visits for syncope variability suggesting that climate changes may have a significant effect on the mode of syncope occurrence.

UR - http://www.scopus.com/inward/record.url?scp=79960818535&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960818535&partnerID=8YFLogxK

U2 - 10.1371/journal.pone.0022719

DO - 10.1371/journal.pone.0022719

M3 - Article

VL - 6

JO - PLoS One

JF - PLoS One

SN - 1932-6203

IS - 7

M1 - e22719

ER -