Risk factors relating to the need for mechanical ventilation in isolated cervical spinal cord injury patients

Cervical spinal cord injuries (SCI) are a major public health problem. Respiratory complications are among the most important causes of morbidity and mortality in patients with cervical SCI, especially respiratory failure. Based on our evaluation of the existing English language literature, few previous studies appear to have reported on risk factors associated with the need for mechanical ventilation in isolated cervical SCI patients who had no concomitant injuries or diseases at the time ofadmission.

The purpose of this study was to determine incidence and riskfactors relating to the needfor mechanical ventilation in isolated cervical spinal cord injury (SCI) patients who had no concomitant injuries.

This retrospective study was conducted by reviewing and analyzing the patient data of 66 isolated cervical-SCI patients who were admitted in our hospital between January 1995 andDecember 2009. Patient medical records were reviewed for demographic data, neurological injuries, needfor mechanical ventilation, definitive treatment, complications, and outcomes. Univariate and multivariate analysis were used to identify predisposing risk factors relating to patient dependency on mechanical ventilation.

Of the 66patients, 30.3% (20/66) required mechanical ventilation and 22.7% (15/66) were identified as complete cord injury, ofwhich seven sustained injury above CS. Of the patients with complete SCI, 66.7% (10/15) were dependent on mechanical ventilation, as were 85% (6/7) with SCI above C5. All five of the patients with complete-SCI above C5 who received operative treatment were dependent upon mechanical ventilation, postoperatively. Only 19.6% (10/51) of the incomplete injury group required mechanical ventilation. Univariate analysis indicated the following factors as significantly increasing the risk ofventilator dependence: complete SCI (p = 0.001), SCI above C5 level (p = 0.011) and operative treatment (p = 0.008). Multivariate analysis identified the following factors as being predisposing risk factors relating to the need of mechanical ventilation: complete SCI (OR: 12.8; 95% CI 2.4-66.9; p = 0.003), SCI above C5 level (OR: 12.0; 95% CI 2.4-60.2; p = 0.002), and operative treatment (OR: 14.8; 95% CI2.1-106.9;p = 0.008).

Complete SCI, SCI above C5, and operative treatment were predisposing risk factors relating to the need for mechanical ventilation in isolated cervical SCI patients. The data and findings put forth in this study suggest that these factors may assist in predicting the needfor mechanical ventilation as a long-term treatment for isolated cervical SCI patients.