The use of operant conditioning techniques in the respiratory rehabilitation of the tetraplegic

A systematic review of intensive cardiopulmonary management after spinal cord injury

Intensive cardiopulmonary management is frequently undertaken in patients with spinal cord injury (SCI), particularly due to the occurrence of neurogenic shock and ventilatory insufficiency and in an attempt to reduce secondary injury. We undertook a systematic review of the literature to examine the evidence that intensive care management improves outcome after SCI and to attempt to define key parameters for cardiopulmonary support/resuscitation. We review the literature in five areas: management of SCI patients in specialized centers, risk in SCI patients of cardiopulmonary complications, parameters for blood pressure and oxygenation/ventilation support following SCI, risk factors for cardiopulmonary insufficiency requiring ICU care after SCI, and preventative strategies to reduce the risks of cardiopulmonary complications in SCI patients. The literature supports that, in light of the significant incidence of cardiorespiratory complications, SCI patients should be managed in a monitored special care unit. There is weak evidence supporting the maintenance of MAP >85 mmHg for a period extending up to 1 week following SCI.

Pulmonary Manifestations of Neurological Disease

Breathing is a complicated act that requires sophisticated control mechanisms. The nervous system coordinates 3 fundamentally important components of respiration. The central nervous system has a central pattern generator that, along with appropriate feedback mechanisms, establishes both the resiratory rate and the depth of respirations. The peripheral nervous system facilitates transmission of these respiratory commands to the ventilatory muscles. The nervous system also contributes to the control of airway size. Laryngeal function is coordinated with inspiration, and local nerves in the lung have a major role in determining bronchial patency. Finally, the nervous system acts in incompletely understood ways to regulate perfusion of the lungs and to match local pulmonary blood flow with ventilation. Failure of the nervous system to adequately control these 3 different aspects of respiration may result in lifethreatening illness. Understanding how the nervous system affects control of ventilation, airway patency, and pulmonary perfusion therefore will enable intensivists to recognize and manage the pulmonary complications of neurological disease.

Long-term outlook in quadriplegic patients with initial ventilator dependency

Traumatic spinal cord injuries frequently result in respiratory insufficiency. With intensive medical support, many of these patients live productive lives in spite of severe neurologic deficit. A ten-year review of ventilator-dependent quadriplegic patients at Craig Rehabilitation Hospital was undertaken to determine the number of patients who could be weaned from mechanical ventilation and their long-term survival rate. Ventilator dependency is defined as requiring continuous mechanical ventilatory support for 30 or more days. Of the 134 patients that were included in the study, 76 were weaned during initial hospitalization. Factors which adversely affected ability to wean include: 1) high level of neurologic injury, 2) age greater than 50 years, and 3) other associated injuries. Of the ventilator-dependent patients surveyed after leaving the hospital, survival rate at one year was 90 percent (37 of 41), 56 percent (14 of 25), at three years and 33 percent (7 of 21) at five years. We conclude that vigorous medical support and maximal efforts to wean these patients from mechanical ventilation should be undertaken to: minimize the financial and emotional burden of long term institutional care, reduce ventilator dependency, and improve overall quality of life.