Author’s replyBMJ 2010; 341 doi: http://dx.doi.org/10.1136/bmj.c7421 (Published 30 December 2010) Cite this as: BMJ 2010;341:c7421
- Jeffrey J Perry, associate professor1
- 1Department of Emergency Medicine, University of Ottawa and Ottawa Hospital Research Institute, Ottawa, Ontario, Canada K1Y 4E9
Marcus and colleagues are concerned about the time from onset to peak headache.1 Although most patients with subarachnoid haemorrhage have a rapidly peaking headache, we showed that this is not uniformly true. We therefore opted for a longer time to peak intensity criterion to catch more slowly peaking cases of subarachnoid haemorrhage. We found 14 patients with subarachnoid haemorrhage with onset to peak headache greater than 5 minutes (in 11 cases greater than 15 minutes and in one case 1 hour). Hence, we believe our onset time was appropriate. Our …
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