Article Figures & Data
Tables
Patient Time from Symptom Onset to Head CT Time from Head CT to LP Tube 1 (RBCs/mm3) CSF Description Tube 4 (RBCs/mm3) CSF Description % Change from Tube 1 to 4 Angiographic Result 1 4 days 5 hours 3550 Cloudy 2550 Slightly bloody −28.2 Basilar artery dissecting aneurysm 2 3 days 5 hours 24,686 Cloudy 17,842 Bloody −27.7 Right posterior communicating artery aneurysm 3 8 days 2 hours before CT 14,325 Xanthochromic 11,207 Xanthochromic −21.8 Anterior communicating artery aneurysm 4 7 days 1 hour 2249 Cloudy 2129 Bloody −5.3 Left vertebral artery dissection 5 3 hours 3 hours 29,710 Cloudy 33,700 Bloody 13.4 Anterior communicating artery aneurysm 6 2 days 6 hours before CT 69 Clear 100 Clear 45 Right middle cerebral artery aneurysm 7 24 days 2 hours 192 Clear 1150 Slightly bloody 499 Anterior communicating artery aneurysm 8 3 hours 9 hours 80 Clear 6225 Slightly bloody 7700 Right anterior communicating artery aneurysm Patient Tube 1 (RBCs/mm3) Tube 4 (RBCs/mm3) % Change from Tube 1 to 4 Angiographic Result Clinical Diagnosis 1 293 2 −99 Normal None. Normal follow-up cerebral MRA. 2 6230 60 −99 Normal Traumatic SAH 3 711 404 −43.2 Normal Cocaineuse or migraine 4 2450 2100 −14.3 Normal Sickle-cell disease 5 414,750 364,875 −12.0 Normal None, normal follow-up cerebral MRA 6 117,600 105,400 −10.4 Normal Varicella and cryptococcal meningitis (HIV+) 7 1634 1623 −0.7 Normal Sickle-cell disease 8 65,363 68,750 5.2 Normal None, normal follow-up cerebral angiography 9 33,525 36,425 8.7 Normal None, normal follow-up cerebral angiography 10 120 149 24.2 Normal Systemic lupus erythematosus and antiphospholipid antibody syndrome 11 69,090 91,035 31.8 Normal None; patient lost to follow-up 12 992 1776 79.0 Normal Migraine headache 13 37 119 220 Normal Traumatic SAH 14 837 8330 895 Normal Varicella encephalitis (HIV+) Note.—Bold entries indicate cases in which the 25% threshold for clearing was met.
