Number of Cardiologists per Cardiovascular Beds and In-Hospital Mortality for Acute Heart Failure: A Nationwide Study in Japan

Koshiro Kanaoka, Satoshi Okayama, Michikazu Nakai, Yoko Sumita, Kenji Onoue, Tsunenari Soeda, Kunihiro Nishimura, Rika Kawakami, Hiroyuki Okura, Yoshihiro Miyamoto, Satoshi Yasuda, Hiroyuki Tsutsui, Issei Komuro, Hisao Ogawa, Yoshihiko Saito

Research output: Contribution to journalArticle

Abstract

Background Little evidence is available about the number of cardiologists required for appropriate treatment of heart failure (HF). Our objective was to determine the association between the number of cardiologists per cardiology beds for treating patients with acute HF and in-hospital mortality. Methods and Results This was a cross-sectional study, and we used the Japanese Registry of All Cardiac and Vascular Diseases Diagnosis Procedure Combination discharge database. The data of patients with HF on emergency admission from April 1, 2012, to March 31, 2014, were extracted. The patients were categorized into 4 groups by the quartiles of the numbers of cardiologists per 50 cardiovascular beds (first group: median, 4.4 [interquartile range, 3.5-5.0]; second group: median, 6.7 [interquartile range, 6.5-7.5]; third group: median, 9.7 [interquartile range, 8.8-10.1]; and fourth group: median, 16.7 [interquartile range, 14.0-23.8]). Using multilevel mixed-effect logistics regression, we determined adjusted odds ratios for in-hospital mortality. We identified 154 290 patients with HF on emergency admissions. There were 29 626, 36 587, 46 451, and 41 626 patients in the first, second, third, and fourth groups, respectively. HF severity, on the basis of New York Heart Association classification, was similar in the 3 groups. Adjusted odds ratios (95% CIs) for in-hospital mortality were 0.92 (0.82-1.04; P=0.20), 0.82 (0.72-0.92; P<0.001), and 0.70 (0.61-0.80; P<0.001) for the second, third, and fourth groups, respectively. The proportion of medication used, including angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, β blockers, and mineralocorticoid receptor antagonists, was positively correlated to the number of cardiologists. Conclusions Patients hospitalized for HF in hospitals with larger numbers of cardiologists per cardiovascular beds had lower 30-day mortality.

Original languageEnglish
Pages (from-to)e012282
JournalJournal of the American Heart Association
Volume8
Issue number18
DOIs
Publication statusPublished - Sep 17 2019

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Hospital Mortality
Japan
Heart Failure
Emergencies
Odds Ratio
Mineralocorticoid Receptor Antagonists
Angiotensin Receptor Antagonists
Cardiology
Treatment Failure
Vascular Diseases
Angiotensin-Converting Enzyme Inhibitors
Registries
Cardiologists
Heart Diseases
Cross-Sectional Studies
Logistic Models
Databases
Mortality

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine

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Number of Cardiologists per Cardiovascular Beds and In-Hospital Mortality for Acute Heart Failure : A Nationwide Study in Japan. / Kanaoka, Koshiro; Okayama, Satoshi; Nakai, Michikazu; Sumita, Yoko; Onoue, Kenji; Soeda, Tsunenari; Nishimura, Kunihiro; Kawakami, Rika; Okura, Hiroyuki; Miyamoto, Yoshihiro; Yasuda, Satoshi; Tsutsui, Hiroyuki; Komuro, Issei; Ogawa, Hisao; Saito, Yoshihiko.

In: Journal of the American Heart Association, Vol. 8, No. 18, 17.09.2019, p. e012282.

Research output: Contribution to journalArticle

Kanaoka, K, Okayama, S, Nakai, M, Sumita, Y, Onoue, K, Soeda, T, Nishimura, K, Kawakami, R, Okura, H, Miyamoto, Y, Yasuda, S, Tsutsui, H, Komuro, I, Ogawa, H & Saito, Y 2019, 'Number of Cardiologists per Cardiovascular Beds and In-Hospital Mortality for Acute Heart Failure: A Nationwide Study in Japan', Journal of the American Heart Association, vol. 8, no. 18, pp. e012282. https://doi.org/10.1161/JAHA.119.012282
Kanaoka, Koshiro ; Okayama, Satoshi ; Nakai, Michikazu ; Sumita, Yoko ; Onoue, Kenji ; Soeda, Tsunenari ; Nishimura, Kunihiro ; Kawakami, Rika ; Okura, Hiroyuki ; Miyamoto, Yoshihiro ; Yasuda, Satoshi ; Tsutsui, Hiroyuki ; Komuro, Issei ; Ogawa, Hisao ; Saito, Yoshihiko. / Number of Cardiologists per Cardiovascular Beds and In-Hospital Mortality for Acute Heart Failure : A Nationwide Study in Japan. In: Journal of the American Heart Association. 2019 ; Vol. 8, No. 18. pp. e012282.
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T2 - A Nationwide Study in Japan

AU - Kanaoka, Koshiro

AU - Okayama, Satoshi

AU - Nakai, Michikazu

AU - Sumita, Yoko

AU - Onoue, Kenji

AU - Soeda, Tsunenari

AU - Nishimura, Kunihiro

AU - Kawakami, Rika

AU - Okura, Hiroyuki

AU - Miyamoto, Yoshihiro

AU - Yasuda, Satoshi

AU - Tsutsui, Hiroyuki

AU - Komuro, Issei

AU - Ogawa, Hisao

AU - Saito, Yoshihiko

PY - 2019/9/17

Y1 - 2019/9/17

N2 - Background Little evidence is available about the number of cardiologists required for appropriate treatment of heart failure (HF). Our objective was to determine the association between the number of cardiologists per cardiology beds for treating patients with acute HF and in-hospital mortality. Methods and Results This was a cross-sectional study, and we used the Japanese Registry of All Cardiac and Vascular Diseases Diagnosis Procedure Combination discharge database. The data of patients with HF on emergency admission from April 1, 2012, to March 31, 2014, were extracted. The patients were categorized into 4 groups by the quartiles of the numbers of cardiologists per 50 cardiovascular beds (first group: median, 4.4 [interquartile range, 3.5-5.0]; second group: median, 6.7 [interquartile range, 6.5-7.5]; third group: median, 9.7 [interquartile range, 8.8-10.1]; and fourth group: median, 16.7 [interquartile range, 14.0-23.8]). Using multilevel mixed-effect logistics regression, we determined adjusted odds ratios for in-hospital mortality. We identified 154 290 patients with HF on emergency admissions. There were 29 626, 36 587, 46 451, and 41 626 patients in the first, second, third, and fourth groups, respectively. HF severity, on the basis of New York Heart Association classification, was similar in the 3 groups. Adjusted odds ratios (95% CIs) for in-hospital mortality were 0.92 (0.82-1.04; P=0.20), 0.82 (0.72-0.92; P<0.001), and 0.70 (0.61-0.80; P<0.001) for the second, third, and fourth groups, respectively. The proportion of medication used, including angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, β blockers, and mineralocorticoid receptor antagonists, was positively correlated to the number of cardiologists. Conclusions Patients hospitalized for HF in hospitals with larger numbers of cardiologists per cardiovascular beds had lower 30-day mortality.

AB - Background Little evidence is available about the number of cardiologists required for appropriate treatment of heart failure (HF). Our objective was to determine the association between the number of cardiologists per cardiology beds for treating patients with acute HF and in-hospital mortality. Methods and Results This was a cross-sectional study, and we used the Japanese Registry of All Cardiac and Vascular Diseases Diagnosis Procedure Combination discharge database. The data of patients with HF on emergency admission from April 1, 2012, to March 31, 2014, were extracted. The patients were categorized into 4 groups by the quartiles of the numbers of cardiologists per 50 cardiovascular beds (first group: median, 4.4 [interquartile range, 3.5-5.0]; second group: median, 6.7 [interquartile range, 6.5-7.5]; third group: median, 9.7 [interquartile range, 8.8-10.1]; and fourth group: median, 16.7 [interquartile range, 14.0-23.8]). Using multilevel mixed-effect logistics regression, we determined adjusted odds ratios for in-hospital mortality. We identified 154 290 patients with HF on emergency admissions. There were 29 626, 36 587, 46 451, and 41 626 patients in the first, second, third, and fourth groups, respectively. HF severity, on the basis of New York Heart Association classification, was similar in the 3 groups. Adjusted odds ratios (95% CIs) for in-hospital mortality were 0.92 (0.82-1.04; P=0.20), 0.82 (0.72-0.92; P<0.001), and 0.70 (0.61-0.80; P<0.001) for the second, third, and fourth groups, respectively. The proportion of medication used, including angiotensin-converting enzyme inhibitors or angiotensin receptor blockers, β blockers, and mineralocorticoid receptor antagonists, was positively correlated to the number of cardiologists. Conclusions Patients hospitalized for HF in hospitals with larger numbers of cardiologists per cardiovascular beds had lower 30-day mortality.

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