Arctic Sun medical device

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The Arctic Sun Temperature Management System is a non-invasive Targeted Temperature Management System medical device used to modulate patient temperature with precision by circulating chilled water in pads directly adhered to the patient's skin. Using varying water temperatures and a sophisticated computer algorithm, a patient's body temperature can be controlled within 0.2°C. The Arctic Sun Temperature Management System is produced by Medivance, Inc. of Louisville, Colorado.

Contents

Background

Body temperature, which is systematically measured and reported as a vital sign, contributes to maintenance of normal physiology and affects the processes that lead to recovery after illness. Intentional manipulation of body temperature has emerged as a treatment strategy.

One of the most common practices of targeted temperature management is to reduce body temperature to a “mild hypothermic state” (per the AHA guidelines is 33°C (91.4°F). for 12-24 hours and then slowly re-warm the body back to normal 37°C (98.6°F). The purpose of this is to slow the metabolic processes and the chemical cascade that occurs when the brain goes without oxygen for a period of time. Research has shown, that by reducing body temperature the brain may recover to normal function in approximately 60% of the patients treated. Therapeutic hypothermia, which lowers the patient's body temperature to levels between 32–34 °C (90–93 °F), is used to help reduce the risk of the ischemic injury to the brain following a period of insufficient blood flow. Periods of insufficient blood flow may be caused by cardiac arrest, stroke, or brain trauma.[1] Non-invasively induced therapeutic hypothermia has been shown to reduce mortality of successfully resuscitated cardiac arrest victims by 35 percent and increase the chance of a good neurologic outcome by 39 percent.[2]

Device description

The Arctic Sun has been explained as dry water immersion. It is a non-invasive precision temperature management system that is often used to induce hypothermia in comatose patients that have suffered from Sudden Cardiac Arrest (SCA) and patients at risk for ischemic brain damage. The unique thing about the Arctic Sun is the gel pads, which stick to a patient’s body using an adhesive called hydrogel—a substance that adheres to the skin without removing hair follicles. The gel pads cover only a portion of a patient’s body and subsequently leave most of the body free for augmenting medical procedures. The device operates under negative pressure and circulates water through these pads at a temperature between 4–42 °C (39–108 °F). Water is pulled through the pads, which minimizes the risk of leakage. By controlling the temperature of the water running through the gel pads, the Arctic Sun’s adjusts a patient’s temperature. Arctic Sun is also can rewarm patients. Controlled rewarming has been sited in the literature as beneficial in preventing reperfusion injury. Because of the Arctic Sun’s noninvasive nature, treatment can be delivered without the host of adverse events associated with invasive procedures such as cooling catheters.[3]

A fomer complaint levied against the Arctic Sun relates to the risk of skin injury. a study published in 2007 found that the Arctic Sun was, "highly effective in lowering patients’ temperature rapidly without inducing skin irritations."[4] . Further, when comparing MDR's registed by Medivance vs the cooling catheters and conventional cooling blankets and wraps, one will find far fewere incidence of patient injury.

Invasive cooling catheter companies have claimed that catheters can lower body temperature at a faster rate, which is relevant because most of the clinical data suggests that the sooner cooling initiates the better a patient’s outcome. However, there exists a 75 minute delay on average between admittance and catheter insertion. Even with a physician readily available to place the cooling catheter, the operating instructions underline the importance of the device set up with takes a minimum of 25 minutes. When objectively evaluating the published data the average cooling rate for cooling catheters is 1.12°C. Treatment with the Arctic Sun can be administered within 10 minutes by unsupervised nursing professionals.

Historically, clinicians reported that catheters cool at a quicker rate, however, a 2011 study published in the Society of Critical Care Medicine where 167 patients treated either with the Arctic Sun or the Alsius Coolgard Cather showed the following:

There was no significant difference in survival with good neurologic function, either to hospital discharge or at follow-up. Time from cardiac arrest to achieving mild therapeutic hypothermia was equal with both devices (surface, 273 min, core, 270 min).”

However, this could not be confirmed in the present study, because there was no difference in the rate of shivering in surface-cooled or core-cooled patients.”

Conclusions: “Surface and core cooling of out-of hospital cardiac arrest patients following the same established postresuscitation treatment protocol resulted in similar survival to hospital discharge and comparable neurologic function at follow-up.”

Crit Care Med Vol 39 No 3

In a case attracting much media attention in May 2008, the Arctic Sun was used to induce hypothermia in a 59 year old woman in West Virginia who had suffered 3 cardiac arrests within a 24 hour period. For more than 17 hours the woman had no measurable brain waves, according to her doctors, and her heart had been stopped for a prolonged period of time. The family decided to take her off life support. Shortly after being disconnected from the ventilator, the woman surprisingly recovered, regaining consciousness, motor function, and speech.[5][6]

See also

References

  1. ^ Polderman, Kees H. “Application of therapeutic hypothermia in the ICU.” Intensive Care Med. (2004) 30:556-575.
  2. ^ Holzer, Michael. “Mild Hypothermia to Improve the Neurologic Outcome After Cardiac Arrest.” New England Journal of Medicine. (2002) Vol. 346, No. 8.
  3. ^ Medivance
  4. ^ Haugk, Moritz et al. “Feasibility and efficacy of new non-invasive cooling device in post resuscitation intensive care medicine.” Resuscitation (2007 75, 76-81.
  5. ^ Stone, Gigi, Tracey Marx, Stephanie Dahle (24 May 2008). "Doctor Calls Near-Death Experience a 'Miracle': Hospital Took Velma Thomas off Life Support – Then She Woke Up.". abcnews.go.com. http://abcnews.go.com/GMA/story?id=4923465&page=1. Retrieved 27 June 2009. 
  6. ^ Pettit, Zack (20 May 2008). "Son making funeral plans gets call that mom's alive: New apparatus helped stave off brain injury". Charleston Daily Mail. http://www.dailymail.com/News/200805200160. Retrieved 27 June 2009. 

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