Hunt and Hess Grading Scale

Both grade SAH severity but use different criteria. Hunt-Hess uses consciousness (alert/drowsy/comatose) and presence of focal deficit in a 5-point scale. WFNS uses Glasgow Coma Scale (GCS) and presence of motor deficit in its criteria, yielding a similar 5-point grade. WFNS is more objective (GCS documented) but more complex. Hunt-Hess is simpler and historically more widely used. Studies show modest differences in prognostic accuracy (r=0.7-0.8 between scales); outcomes similar. Use whichever is institutional standard; cite scale used in publications.

Not reliably. If patient is sedated for mechanical ventilation, Hunt-Hess grade cannot be accurately assigned (consciousness level masked by sedation). Document pre-sedation grade if available; alternatively, note 'Grade unknown due to sedation' and establish plan to re-assess when sedation lightened. Some centers use WFNS scale (GCS component valid even with sedation by protocol reversal). Do not fabricate grade in sedated patients; assessment validity is compromised.

Hunt-Hess grade is prognostic (predicts outcome) but does not determine surgical decision automatically. Grade I-II patients universally offered surgical aneurysm repair due to excellent expected outcomes. Grade III: surgery still typically offered with informed consent. Grade IV-V: neurosurgeon and family discuss candidacy—some centers offer emergent surgery as life-saving attempt; others recommend comfort care given dismal prognosis. The decision integrates Hunt-Hess grade with patient age, premorbid function, family wishes, and institutional resources. Grade informs but does not dictate treatment.

In published outcome studies, Hunt-Hess grade typically refers to grade at admission/initial presentation. If patient improves (e.g., Grade III on admission becomes Grade II after vasospasm treatment), document the improvement but the original admission grade is reported for outcome correlation. Some centers reassess grade at 48-72 hours or after intervention to document interval change. Always specify timing of grade assessment when reporting outcome.

Moribund appearance indicates imminently terminal state: deep coma with fixed dilated pupils, decerebrate posturing, absent brainstem reflexes, or signs of severe brainstem dysfunction. Patient is expected to die despite maximal intervention. Used clinically to communicate prognosis to neurosurgical team and families that Grade V carries dismal outlook. However, definition somewhat subjective; if in doubt (patient comatose but pupils reactive, brainstem reflexes intact), clarify with senior neurosurgeon for Grade IV vs V determination.