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Clinical Trial Summary

Elucidate the influence of intense light therapy pretreatment in patients undergoing cardiac surgery. We hypothesize that intense light exposure is associated with the peripheral stabilization of Per2 in human buccal swabs and plasma samples before surgery and with a decrease of Troponin I levels after surgery. In addition, we hypothesize that light therapy leads to Per2 dependent metabolic optimization in the human cardiac tissue. Therefore, a small piece of human heart tissue from the right atrium will be collected during cardiac cannulation, which will be otherwise discarded.


Clinical Trial Description

PER2 transcript and protein levels in patients undergoing cardiac surgery following intense light therapy utilizing blood samples, buccal swaps and right atrial myocardium. In addition, we will examine the correlation of PER2 levels and PER2 related metabolism and perform a whole genome microarray screen from the collected tissue/blood samples.

Patients will be enrolled 10 to 1 days prior to surgery and will either receive an intense (bright light) box or a placebo/control device (dim/night light box). The patient will start using the light box 7 days prior to surgery every morning from 8.30 to 9.00 AM. The patient will need to keep the box as close as possible to their eyes and not walk away during the treatment period.

Blood /buccal swabs will be collected on the day of enrollment (10-1 days prior to surgery) between 7 and 10 AM without any light therapy and on the day of surgery between 7 and 10 AM before anesthesia induction after one week of light/placebo therapy.

A small piece of the right atrial myocardium (which stems from cardiac cannulation and is otherwise discarded) will be put in liquid nitrogen in the OR and stored for further analysis.

In addition, we will draw a blood sample 72 hrs. after surgery and determine Troponin I levels.

Investigating this patient population will give the necessary evidence if light could also be effective in a perioperative setting to prevent or decrease damage to the myocardium during high risk cardiac surgery. In addition, it will help us understand if light could be used in general to prevent or treat heart ischemia. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03822949
Study type Interventional
Source University of Colorado, Denver
Contact Tobias Eckle, MD, PhD
Phone 7209495646
Email tobias.eckle@ucdenver.edu
Status Not yet recruiting
Phase N/A
Start date April 1, 2019
Completion date January 31, 2020

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