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Patientís Risk of Memory Problems After Heart Surgery can Now be Predicted

by Rishika Gupta on May 11, 2018 at 4:13 PM
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 Patientís Risk of Memory Problems After Heart Surgery can Now be Predicted

Six minutes simple walking test could help determine whether a patient will develop memory problems after heart surgery, finds a new study. The findings of this study are published in the Journal of The Annals of Thoracic Surgery.

Broadly speaking, a decline in cognitive performance after surgery is known as postoperative cognitive dysfunction (POCD). With POCD, a patient's mental aptitude is weaker after surgery, resulting not only in a greater risk of complications but also a lesser quality of life. Cognitive deterioration is increasingly recognized as a common occurrence after major surgery, especially among older adult patients.

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"This study indicates that the easy and inexpensive 6-minute walk distance (6MWD) is a valuable assessment for identifying patients at high risk for POCD," said Kazuhiro Hayashi, PT, MSc, of Nagoya University Hospital in Japan. "If we are able to identify patients who are at risk for POCD, we can provide early treatment and encourage them to better understand the dysfunction."

For this study, Hayashi and colleagues identified 181 patients who were undergoing non-emergency heart surgery between March 2014 and August 2015 at Nagoya University Hospital. The mean age of the patients was 71.4 years.
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Patients performed the 6MWD test upon admission for their operations. Functional exercise capacity was measured by having patients walk the length of a predetermined course at their own pace while attempting to cover as much ground as possible in 6 minutes. The distance covered in that duration was measured to the nearest meter. According to the results of this study, a low 6MWD was an associated risk factor for POCD after cardiac surgery. In fact, the lower the 6MWD was, the more significant the reduction in cognitive function postoperatively was. Of the study participants, 51 (28 percent) developed POCD.

"It is increasingly recognized that a patient's fitness level has an impact on how well he/she does after a surgical procedure," said Rakesh C. Arora, MD, Ph.D., of St. Boniface Hospital in Winnipeg, Canada, who was not involved with this research. "This study further highlights the need for the healthcare team to undertake a more detailed assessment of patients' physical fitness before the operation. The 6MWD is an important component of this evaluation."

According to Dr. Arora, the identification of patients at risk for POCD and other cognitive disorders should alert the healthcare team to consider modifying anesthetic and medication choices during-and-after the operations, as well as assist with discharge planning as patients transition to home. In addition, the healthcare team should consider strategies, such as prehabilitation, to optimize the patients' fitness before their operations. Dr. Arora explained that prehabilitation includes a combination of exercise training, education, and social support intended to improve patients' physical and psychological readiness for surgery.

"Prehabilitation may be of benefit to patients with poor physical fitness by improving postoperative recovery and post-discharge functional survival," said Dr. Arora. "Patient self-management and follow-through are essential, however, as is the patient's understanding of their health issues and their proposed plan of care."

Dr. Hayashi agrees that a multidisciplinary approach, which includes elements such as prehabilitation, is key to a better assessment and treatment outcome. "Precise preoperative risk assessment for postoperative complications is critical, and when indicated, supervised exercise before an operation should be recommended to improve functional exercise capacity before heart surgery," he said.

Source: Eurekalert
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