CLAUS PUGGAARD – CO-FOUNDER, CHROMAVISO LIGHTING SOLUTIONS
Role ofcircadian lighting in reducing depression
About one-third of patients experience depression after a blood clot or haemorrhage in the brain, which is known as apoplexy. This has consequences in terms of reduced daily activity levels and an increased mortality rate. Since 2013, a Danish research project carried out within the apoplexy unit at the neurological clinic at Copenhagen University Hospital has been looking at whether circadian lighting is of any consequence in apoplexy patients who have been hospitalised for rehabilitation.
The lighting sysytem has been developed to create the necessary combination of light changes and darkness over 24 hours.
In 2013, Copenhagen University Hospital and Aarhus University Hospital started working with Chromaviso on developing and documenting the benefits of circadian lighting in a cross disciplinary, public- private co-operation with support from the Market Development Fund. This study is the first to measure the effect of circadian lighting on hospitalised patients with apoplexy. The randomised clinically controlled
study included 90 patients, half of whom were treated on a ward with circadian lighting installed, while the other half, the control group, were treated on a ward with standard lighting. A solution called Circadian Lighting was developed that is based on a combination of insight into everyday clinical life, knowledge about the effect of the light on people and competences within circadian rhythm products and technology.
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For hospitalised patients, it can be a challenge to maintain a natural circadian rhythm. Patients who are hospitalised for rehabilitation after a blood clot or brain haemorrhage are often immobile, do not go outside and therefore are not exposed to the daylight the brain needs to achieve a stable circadian rhythm, according to Doctor Anders West from Copenhagen University Hospital. Therefore, the Circadian Lighting system has been designed to maintain a natural circadian
Claus Puggaard
Claus Puggaard has been working with health promoting lighting for the past 20 years. In 2006, he co-founded
Chromaviso based on co-operaration with doctors, researchers and
healthcare staff. Chromaviso delivers evidence based lighting solutions to hospitals, psychiatric units and nursing homes. In 2013, Claus Puggaard and
Chromaviso initiated a research project with Rigshospitalet and Aarhus University Hospital about the effects of circadian lighting.
rhythm by imitating natural sunlight during the day and creating the necessary combination of light changes and darkness over 24 hours. In order to maintain the circadian
rhythm, it is necessary to receive stimulation from light – particularly the blue spectrum during the day – but it is equally important to avoid light stimulation at night, which can be a challenge in a hospital. Therefore, in the Circadian Lighting system, the stimulating blue light has been removed from the evening/night light, thus uniting the needs of patients for the necessary light spectrum with the needs of staff to see and be able to carry out various tasks during the night and the day. It requires special technology and in-depth knowledge to unite these needs in a coherent and effective circadian rhythm design. The system includes a light protocol
that creates a natural and steady rhythm between light and darkness during the day and at night in order to provide a health promoting physiological effect, a stable circadian rhythm and the right
IFHE DIGEST 2018
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