Abstract
A 61-year-old man with pulmonary emphysema was admitted due to acute exacerbation of chronic respiratory failure and a complaint of chest pain. A chest CT scan on admission showed aneurysmal dissection from the ascending aorta to the descending aorta. Analgesia was noted below the fourth thoracic vertebra, which supplies the accessory respiratory muscles including the intercostal muscles. Even after recovery from circulatory failure, his chest muscles were weak and he could not be removed from mechanical ventilation. An autopsy revealed ischemia of the spinal cord at the T4 level. In contrast, The C3 level of the spinal cord, which supplies the diaphragm, was intact. Paralysis of accessory respiratory muscles including intercostal muscles may have caused the continuation of the respiratory failure. This case shows the importance of accessory respiratory muscles in maintaining chest wall movement in patients with chronic pulmonary emphysema.
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