Spinal cord injuries associated with increased risk of heart disease
New research from the Heart and Stroke Foundation and the Christopher and Dana Reeve Foundation may help explain why people with spinal cord injury (SCI) have a higher risk of developing heart disease.
Damage to the autonomic nervous system is a key predictor of cardiovascular risk, researcher Rianne Ravensbergen told the Canadian Cardiovascular Congress 2011, co-hosted by the Heart and Stroke Foundation and the Canadian Cardiovascular Society.
Heart disease after a SCI is the leading cause of morbidity and mortality in this population. It is well known that regular exercise is beneficial for cardiovascular health. However, for people with SCI, says Ravensbergen, a PhD candidate supervised by Dr. Victoria Claydon in the cardiovascular physiology laboratory at Simon Fraser University, exercise is only part of the story. “In this specific group we should also be looking at whether they have autonomic dysfunction, because this causes a higher risk for heart disease.”
The autonomic system controls functions of the body that are automatic, or involuntary – such as activities of the bladder, bowel, gastrointestinal tract, liver, heart, and blood vessels. After SCI the autonomic nerves in the spinal cord can be damaged, leading to widespread abnormalities in autonomic function, and, of particular relevance to Ravensbergen’s work, abnormal control of the heart and blood vessels.
Cardiovascular disease accounts for 30 percent of all deaths in Canada. For those with spinal cord injury – almost 85,000 Canadians – heart disease tends to develop earlier in life, even in those with a healthy lifestyle. “In people with autonomic dysfunction due to SCI, they may remain at high risk of cardiovascular disease, even if they maintain a healthy lifestyle and exercise regularly,” says Ravensbergen, adding that her findings may help explain this disconnect.
In her study, Ravensbergen assessed 20 people with spinal cord injury and 14 able-bodied controls to determine their risk for cardiovascular disease, including measurements for glucose tolerance, body mass index (BMI), body fat and abdominal fat. Those with SCI had decreased glucose tolerance and increased total and abdominal fat.
Spinal cord injuries associated with cardiopulmonary complications
Twenty-two of 83 consecutive patients with traumatic quadraplegia admitted to a regional spinal injury center had significant bradycardia. These bradycardic patients accounted for 66% of the cervical spinal cord injured patients’ mortality. In general, bradycardia in patients with cervical spinal cord injuries appears to be due to unopposed vagal tone. This bradycardia is self-limited within 3-5 weeks after the onset of paraplegia and does not require permanent pacemaker therapy.
Winslow EB, Lesch M, Talano JV, Meyer PR Jr.
Ravensbergen then divided the SCI group into two subgroups: people with autonomic dysfunction and those without. While both groups had High cholesterol, she was surprised to find that those with autonomic dysfunction had problems with blood sugar. “These people are in a pre-diabetic state, which elevates their risk for heart disease,” she says.
This study indicates that after the recovery period, there is value in screening the autonomic system to evaluate the cardiovascular system of spinal cord patients. Whether an increased risk of heart disease is truly due to the spinal cord injury or related to patient characteristics after such injury remains to be sorted out.
“This made-in-Canada research will aid people with spinal cord injury both in this country and across the globe,” says Heart and Stroke Foundation spokesperson Dr. Beth Abramson. “It will be exciting to pursue this entirely new avenue, which will hopefully allow clinicians to streamline efforts to prevent heart disease in this group of patients.”
What exactly classifies an injury as a spinal cord injury?
Typically, a spinal cord injury begins with a sudden, traumatic blow to the back, neck, or head area, which fractures or breaks one or several of the vertebrae in the back. These vertebrae can then either puncture the spinal cord themselves, or put pressure on the cord so that the cord tears. Although the spinal cord usually doesn’t snap or tear all the way through, in severe cases this can happen, which of course results in complete paralysis. When bone fragments, or even the bones themselves, rip into the spinal cord, little nerve extensions called axons are severed or crushed. These axons serve as the message carriers for the central nervous system, carrying much needed information from the rest of the body to the brain. When the axons can’t function properly, the patient experiences paralysis, whether temporary or permanent.
People with spinal cord injury are normally tested for motor and sensory damage, but not for damage to the autonomic pathways, which run along the spinal cord, says Ravensbergen. “SCI in humans is never clear-cut. We never exactly know which pathways are affected. We don’t really take into consideration how control of the cardiovascular system is affected,” she explains.
Further studies are necessary to investigate the role that autonomic nerves play, how to better measure and improve autonomic function and, ultimately, the best ways to prevent heart disease, she adds.
Ravensbergen says this research could further help inform other autonomic dysfunction disorders and their relationship to heart health.
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Statements and conclusions of study authors are solely those of the study authors and do not necessarily reflect Foundation or CCS policy or position. The Heart and Stroke Foundation of Canada and the Canadian Cardiovascular Society make no representation or warranty as to their accuracy or reliability.
The Heart and Stroke Foundation (heartandstroke.ca), a volunteer-based health charity, leads in eliminating heart disease and stroke and reducing their impact through the advancement of research and its application, the promotion of healthy living, and advocacy.
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