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Mortality and length of stay are highest in heart failure patients admitted in January, on Friday, and overnight, according to research presented today at the Heart Failure Congress 2013.
Lisbon, 25 May 2013: Mortality and length of stay are highest in heart failure patients admitted in January, on Friday, and overnight, according to research presented today at the Heart Failure Congress 2013. The analysis of nearly 1 million heart failure admissions over 14 years was presented by Dr David P. Kao (Denver, Colorado).The Heart Failure Congress 2013 is taking place during 25-28 May in Lisbon, Portugal. The Congress is the main annual meeting of the Heart Failure Association of the European Society of Cardiology (1). Identifying peaks in admissions and mortality should assist targeted resource allocation at higher risk times. Seasonal, weekly and hourly variations have been observed in heart failure admissions but the reasons are unclear. Until now, the relationship of these variations with mortality and length of stay has not been investigated in a single study.The current study (2) examined the impact of day, month and hour of admission on in-hospital mortality and length of stay in 949,907 hospitalisations for congestive heart failure. Data was analysed from all hospitals in the state of New York from 1994 to 2007. A greater number of factors were included in the analysis than ever before so that the researchers could confirm or refute previous theories on the reasons behind variations in heart failure morbidity and mortality (for example substance use).The researchers found that daily heart failure admissions increased significantly over this period (+1.1 admissions/day/year) while in-hospital mortality and length of stay decreased (-0.3%/year and -0.3 days/year, p<0.0001 for all).
Dr Kao said: “These findings confirm the huge decline in mortality in hospitals for heart failure over the past 14-15 years following major advances in therapy.”
Daily heart failure admissions peaked in February (p<0.0001), while in-hospital mortality (p<0.0001) and length of stay (p=0.01) peaked in January. Mortality and length of stay were lowest for admissions between 06h00-12h00 and highest overnight (18h00-24h00) by a small margin (adjusted OR of death 1.22, p<0.0001). Mortality and length of stay were lowest in patients admitted on Monday (adjusted OR of death 1.09, p<0.001) and highest on Friday (p<0.0001).Numerous theories have been mooted for the cause of seasonal variations in heart failure morbidity and mortality, for example that the holiday spike is caused by alcohol and drug use.
Dr Kao said: “For the first time we’ve shown that there wasn’t a higher rate of alcohol and drug use reported in heart failure patients during December and January, when heart failure mortality was the highest.”
Seasonal variations affected rate of heart failure hospitalization and mortality in patients over the age of 30, and the effect was greater with advancing age. An increase in concurrent pneumonia in the winter could impact on heart failure mortality, but there was less seasonal variation in other respiratory diseases like chronic obstructive pulmonary disease (COPD).The findings suggest that staffing may have an impact on seasonal variations in mortality and length of stay. Dr Kao said: “The fact that patients admitted right before the weekend and in the middle of the night do worse and are in hospital longer suggests that staffing levels may contribute to the findings.”He added: “The seasonal effect on in-hospital death from heart failure remained even after controlling for time and weekday of admission, 17 other medical conditions including substance use, kidney disease, and pneumonia, and demographic factors including gender, ethnicity, and medical coverage status. Seasonal variations in morbidity and mortality occur in many diseases, particularly heart disease, and the cold weather itself may have a part to play.”
Dr Kao concluded: “Doctors and hospitals need to be more vigilant during these higher risk times and ensure that adequate resources are in place to cope with demand. Patients should be aware that their disease is not the same over the course of the year and they may be at higher risk during the winter. People often avoid coming into hospital during the holidays because of family pressures and a personal desire to stay at home but they may be putting themselves in danger.”
About the European Society of Cardiology (ESC)The European Society of Cardiology (ESC) represents more than 80,000 cardiology professionals across Europe and the Mediterranean. Its mission is to reduce the burden of cardiovascular disease in Europe.About the Heart Failure Association (HFA)The Heart Failure Association (HFA) is a registered branch of the ESC. Its aim is to improve quality of life and longevity, through better prevention, diagnosis and treatment of heart failure, including the establishment of networks for its management, education and research.For practical information about heart failure aimed at patients, families and caregivers, visit the HFA’s Heart Failure Matters website.About press registration On-site registration opens 25 May 2013 in Lisbon supported by presentation of a press card or letter of assignment with proof of 3 published articles together with the filled in and signed embargo form 2013.Scientific Programme Online
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