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CC BY 4.0 · Aorta (Stamford) 2015; 03(06): 182-186
DOI: 10.12945/j.aorta.2015.15.020
Original Research Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Chronobiology of Stanford Type A Aortic Dissections

A Comparison of Northern versus Southern Hemispheres
Abe DeAnda Jr
7   Division of Cardiothoracic Surgery, University of Texas Medical Branch - Galveston, Galveston, TX, USA
,
Eugene A. Grossi
1   Department of Cardiothoracic Surgery, New York University, New York, New York, USA
,
Leora B. Balsam
1   Department of Cardiothoracic Surgery, New York University, New York, New York, USA
,
Marc R. Moon
2   Division of Cardiothoracic Surgery, Washington University-St. Louis, St. Louis, Missouri, USA
,
Clifford W. Barlow
3   Department of Cardiothoracic Surgery, University Hospital Southampton, Southampton, UK
,
Daniel O. Navia
4   Department of Cardiothoracic Surgery, Instituto Cardiovascular de Buenos Aires, Buenos Aires, Argentina
,
Patricia Ursomanno
1   Department of Cardiothoracic Surgery, New York University, New York, New York, USA
,
Bulat A. Ziganshin
5   Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut, USA
,
Annette E. Rabinovich
1   Department of Cardiothoracic Surgery, New York University, New York, New York, USA
,
John A. Elefteriades
5   Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut, USA
,
Julian A. Smith
6   Department of Cardiothoracic Surgery, Monash Medical Centre, and Department of Surgery (MMC), Monash University, Clayton, Victoria, Australia
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Publikationsverlauf

26. April 2015

15. Juli 2015

Publikationsdatum:
24. September 2018 (online)

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Abstract

Background: Seasonal variations of Stanford Type A dissections (STADs) have been previously described in the Northern Hemisphere (NH). This study sought to determine if these variation are mirrored in the Southern Hemisphere (SH).

Methods: Data from patients treated surgically for STADs were retrospectively obtained from existing administrative and clinical databases from NH and SH sites. Data points of interest included age, sex, date of dissection, and 30-day mortality. The dates of dissections (independent of year) were then organized by season.

Results: A total of 1418 patients were identified (729 NH and 689 SH) with complete data available for 1415; 896 patients were male with a mean age was 61 ± 14 years, and the overall 30-day mortality was 17.3%. Comparison of NH and SH on a month-to-month basis demonstrated a 6-month phase shift and a significant difference by season, with STADs occurring predominantly in the winter and least in the summer. Decomposition of the monthly incidence using Fourier analysis revealed the phase shift of the primary harmonic to be –21.9 and 169.8 degrees (days), respectively, for NH and SH. The resultant 191.7 day difference did not exactly correspond to the anticipated 6-month difference but was compatible with the original hypothesis.

Conclusion: Chronobiology plays a role in the occurrence of STADs with the highest occurrence in the winter months independent of the hemisphere. Season is not the predominant reason why aortas dissect, but for patients at risk, the increase in systemic vascular resistance during the winter months may account for the seasonal variations seen.

Key Words

Aortic dissection - Chronobiology
 

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