Study of the Influence of the Moon and Seasons On Outcomes Following Surgery To Repair Ascending Aortic Dissection

Study Overview
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Brief Summary
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That the full-moon stage of the lunar cycle is associated with reduced mortality and shorter length of stay in patients undergoing repair of aortic dissection, after adjusting for seasonal effects, demographics and cardiovascular risk factors.

Detailed Description
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The primary objective of this study is to determine whether the findings of Shuhaiber et al. [2013] (see citations) may be confirmed using national audit data from the United Kingdom. A cohort of all acute ascending aortic dissection repair surgeries will be extracted from the National Adult Cardiac Surgery Audit (NACSA) database. The current dataset version 4.12, available for download from the website of the National Institute for Cardiovascular Outcomes Research (see links), contains 168 fields that detail pre-operative patient characteristics, operative details and post-operative outcomes. The dataset is revised intermittently to meet the requirements of users and to respond to changes in the management of adult cardiac surgery; however, the fields to be analysed in this study have not been subject to any documented revisions. The extracted data are to be cleaned using version 9.9 of the NACSA cleaning algorithm. Seasons are to be coded in the same way as in the published study: autumn (September 21 through December 20), winter (December 21 through March 21), spring (March 22 through June 21) and summer (June 22 through September 20). Three definitions are to be used for the phases of the moon. The first definition mirrors that employed in the motivating work: each lunar cycle from new moon to new moon is to be split into four parts and labelled New, Waxing, Full and Waning. The second definition centers each of those four labels around the named event: i.e., the New period is to be centered around the new moon event itself, instead of starting on the day of a new moon as in the first definition. The third definition will split the lunar cycle into 8 event-centred periods, called New, Waxing crescent, First quarter, Waxing gibbous, Full, Waning gibbous, Last quarter and Waning crescent. There is no need to explore the individual univariate relationships of predictors to outcomes in this work, given its limited purpose to confirm the earlier multivariate findings. The relationship between the environmental factors (seasons and the lunar cycle) and in-hospital mortality will be examined using multivariate logistic regression, controlling for demographic and mortality risk factors. The specific variables that can be included in common with the earlier work are age, sex, hypertension, diabetes, renal failure, and an indicator of weekend admission. The national audit does not include information on dyslipidaemia, but it is felt that its exclusion from our model will not effect the comparability of our work to the earlier study because none of the earlier published models showed any effect of dyslipidaemia on surgical outcomes. The relationship of the environmental factors to Length of stay (LOS) in survivors will be examined using a multivariate linear regression that includes the same risk factors as in the mortality model. As in the published study, LOS will be transformed to the natural logarithmic scale prior to analysis. We will run all analyses with and without a European system for cardiac operative risk evaluation score (EuroSCORE) II risk adjustment. The EuroSCORE II was developed specifically to adjust for risk of in-hospital mortality. It will be employed here despite its absence from the published models to ensure that risk adjustment prior to estimation of the contributions of the environmental factors will be as thorough as reasonably possible. All analyses will be performed using R version 3.1.0. Environmental factors will be calculated using the lunar package available from the CRAN software repository.

Official Title
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The Influence of Lunar Cycle On Hospital Outcomes Following Ascending Aortic Dissection Repair

Conditions
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Aneurysm, Dissecting, Aortic Aneurysm

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: acute dissection specified in aortic pathology Exclusion Criteria: missing data in the demographic covariates (age, sex) missing data in the medical history (hypertension, diabetes, renal failure) missing surgical procedure date

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Group A: Single procedure<br>Group A consists of patients recorded as having only had an ascending aortic dissection repair procedure. | |
| Group B: Multiple procedures<br>Group B consists of patients who had an ascending aortic dissection repair procedure together with any other surgical intervention. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| All cause in-hospital mortality |  | During hospital stay, an expected average of 8 days | 
| Length of stay in hospital among survivors to discharge |  | During hospital stay, an expected average of 18 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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cardiovascular, surgery, ascending aorta, aortic dissection