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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Validation of the Ottawa Subarachnoid Hemorrhage Rule in patients with acute headache
|
|---|---|
| Published in |
Canadian Medical Association Journal, November 2017
|
| DOI | 10.1503/cmaj.170072 |
| Pubmed ID | |
| Authors |
Jeffrey J. Perry, Marco L.A. Sivilotti, Jane Sutherland, Corinne M. Hohl, Marcel Émond, Lisa A. Calder, Christian Vaillancourt, Venkatesh Thirganasambandamoorthy, Howard Lesiuk, George A. Wells, Ian G. Stiell |
| Abstract |
We previously derived the Ottawa Subarachnoid Hemorrhage Rule to identify subarachnoid hemorrhage (SAH) in patients with acute headache. Our objective was to validate the rule in a new cohort of consecutive patients who visited an emergency department. We conducted a multicentre prospective cohort study at 6 university-affiliated tertiary-care hospital emergency departments in Canada from January 2010 to January 2014. We included alert, neurologically intact adult patients with a headache peaking within 1 hour of onset. Treating physicians in the emergency department explicitly scored the rule before investigations were started. We defined subarachnoid hemorrhage as detection of any of the following: subarachnoid blood visible upon computed tomography of the head (from the final report by the local radiologist); xanthochromia in the cerebrospinal fluid (by visual inspection); or the presence of erythrocytes (> 1 × 10(6)/L) in the final tube of cerebrospinal fluid, with an aneurysm or arteriovenous malformation visible upon cerebral angiography. We calculated sensitivity and specificity of the Ottawa SAH Rule for detecting or ruling out subarachnoid hemorrhage. Treating physicians enrolled 1153 of 1743 (66.2%) potentially eligible patients, including 67 with subarachnoid hemorrhage. The Ottawa SAH Rule had 100% sensitivity (95% confidence interval [CI] 94.6%-100%) with a specificity of 13.6% (95% CI 13.1%-15.8%), whereas neuroimaging rates remained similar (about 87%). We found that the Ottawa SAH Rule was sensitive for identifying subarachnoid hemorrhage in otherwise alert and neurologically intact patients. We believe that the Ottawa SAH Rule can be used to rule out this serious diagnosis, thereby decreasing the number of cases missed while constraining rates of neuroimaging. |
X Demographics
The data shown below were collected from the profiles of 131 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Canada | 34 | 26% |
| United Kingdom | 27 | 21% |
| Saudi Arabia | 9 | 7% |
| United States | 5 | 4% |
| Japan | 2 | 2% |
| Kuwait | 1 | <1% |
| Mexico | 1 | <1% |
| Malaysia | 1 | <1% |
| Austria | 1 | <1% |
| Other | 3 | 2% |
| Unknown | 47 | 36% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 68 | 52% |
| Practitioners (doctors, other healthcare professionals) | 39 | 30% |
| Scientists | 23 | 18% |
| Science communicators (journalists, bloggers, editors) | 1 | <1% |
Mendeley readers
The data shown below were compiled from readership statistics for 174 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 174 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Other | 22 | 13% |
| Researcher | 19 | 11% |
| Student > Bachelor | 19 | 11% |
| Student > Master | 14 | 8% |
| Student > Doctoral Student | 13 | 7% |
| Other | 38 | 22% |
| Unknown | 49 | 28% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 88 | 51% |
| Nursing and Health Professions | 7 | 4% |
| Neuroscience | 5 | 3% |
| Unspecified | 4 | 2% |
| Psychology | 3 | 2% |
| Other | 11 | 6% |
| Unknown | 56 | 32% |
Attention Score in Context
This research output has an Altmetric Attention Score of 180. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 04 May 2023.
All research outputs
#223,635
of 25,424,630 outputs
Outputs from Canadian Medical Association Journal
#402
of 9,463 outputs
Outputs of similar age
#4,555
of 337,538 outputs
Outputs of similar age from Canadian Medical Association Journal
#11
of 103 outputs
Altmetric has tracked 25,424,630 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 9,463 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 34.1. This one has done particularly well, scoring higher than 95% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 337,538 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 98% of its contemporaries.
We're also able to compare this research output to 103 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 90% of its contemporaries.