Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of vision, aphasia, neglect and National Institutes of Health Stroke Scale for emergent large vessel occlusion
| Large artery clot | No large artery clot | ||
|---|---|---|---|
| VAN+ | 14 | 5 | 19 Total VAN+ |
| VAN− | 0 | 43 | 43 Total VAN− |
| 14 Large artery clot | 48 No large artery clot | ||
| Large artery clot | No large artery clot | ||
| NIHSS ≥6 | 14 | 10 | 24 Total |
| NIHSS <6 | 0 | 38 | 38 Total |
| 14 Large artery clot | 48 No large artery clot |
Positive predictive value of VAN=14/19=74%; sensitivity=14/14=100%.
Positive predictive value of NIHSS=14/24=58%; sensitivity=14/14=100%.
Negative predictive value of VAN=43/43=100%; specificity=43/48=90%.
Negative predictive value of NIHSS=38/38=100%; specificity=38/48=79%.
Accuracy VAN=57/62=92%.
Accuracy NIHSS=52/62=84%.
In addition, the goal of the quality study was to access average door to needle times. Our average time before implementation of VAN was 2 h 40 min. The time was reduced to 1 h 25 min when the VAN protocol was employed.
NIHSS, National Institutes of Health Stroke Scale; VAN, vision, aphasia, and neglect.