Spinal Cord Injury: Treatments and Rehabilitation Symptoms, Causes …

How Does a Spinal Cord Injury Affect the Rest of the Body?

People who survive a spinal cord injury will most likely have medical complications such as chronic pain and bladder and bowel dysfunction, along with an increased susceptibility to respiratory and heart problems. Successful recovery depends upon how well these chronic conditions are handled day to day.

Any injury to the spinal cord at or above the C3, C4, and C5 segments, which supply the phrenic nerves leading to the diaphragm, can stop breathing. People with these injuries need immediate ventilatory support. When injuries are at the C5 level and below, diaphragm function is preserved, but breathing tends to be rapid and shallow and people have trouble coughing and clearing secretions from their lungs because of weak thoracic muscles. Once pulmonary function improves, a large percentage of those with C4 injuries can be weaned from mechanical ventilation in the weeks following the injury.

Respiratory complications, primarily as a result of pneumonia, are a leading cause of death in people with spinal cord injury. In fact, intubation increases the risk of developing ventilator-associated pneumonia (VAP) by 1 to 3 percent per day of intubation. More than a quarter of the deaths caused by spinal cord injury are the result of VAP. Spinal cord injury patients who are intubated have to be carefully monitored for VAP and treated with antibiotics if symptoms appear.

Spinal cord injuries in the cervical region are often accompanied by blood pressure instability and heart arrhythmias. Because of interruptions to the cardiac accelerator nerves, the heart can beat at a dangerously slow pace, or it can pound rapidly and irregularly. Arrhythmias usually appear in the first 2 weeks after injury and are more common and severe in the most serious injuries.

Low blood pressure also often occurs due to loss of tone in blood vessels, which widen and cause blood to pool in the small arteries far away from the heart. This is usually treated with an intravenous infusion to build up blood volume.

People with spinal cord injuries are at triple the usual risk for blood clots. The risk for clots is low in the first 72 hours, but afterwards anticoagulation drug therapy can be used as a preventive measure.

Many of our reflex movements are controlled by the spinal cord but regulated by the brain. When the spinal cord is damaged, information from the brain can no longer regulate reflex activity. Reflexes may become exaggerated over time, causing spasticity. If spasms become severe enough, they may require medical treatment. For some, spasms can be as much of a help as they are a hindrance, since spasms can tone muscles that would otherwise waste away. Some people can even learn to use the increased tone in their legs to help them turn over in bed, propel them into and out of a wheelchair, or stand.

Autonomic dysreflexia is a life-threatening reflex action that primarily affects those with injuries to the neck or upper back. It happens when there is an irritation, pain, or stimulus to the nervous system below the level of injury. The irritated area tries to send a signal to the brain, but since the signal isn't able to get through, a reflex action occurs without the brain's regulation. Unlike spasms that affect muscles, autonomic dysreflexia affects vascular and organ systems controlled by the sympathetic nervous system.

Anything that causes pain or irritation can set off autonomic dysreflexia: the urge to urinate or defecate, pressure sores, cuts, burns, bruises, sunburn, pressure of any kind on the body, ingrown toenails, or tight clothing. For example, the impulse to urinate can set off high blood pressure or rapid heart beat that, if uncontrolled, can cause stroke, seizures, or death. Symptoms such as flushing or sweating, a pounding headache, anxiety, sudden high blood pressure, vision changes, or goosebumps on the arms and legs can signal the onset of autonomic dysreflexia. Treatment should be swift. Changing position, emptying the bladder or bowels, and removing or loosening tight clothing are just a few of the possibilities that should be tried to relieve whatever is causing the irritation.

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Spinal Cord Injury: Treatments and Rehabilitation Symptoms, Causes ...