Original Article
Identification of Nonischemic Stroke Mimics Among 411 Code Strokes at the University of California, San Diego, Stroke Center

https://doi.org/10.1016/j.jstrokecerebrovasdis.2007.09.008Get rights and content

Background

Code Stroke systems are widely used to expedite emergency treatment of patients with stroke. Code Stroke for mimic patients–those without a stroke cause–wastes resources. We investigated how many times a Code Stroke was initiated for patients who did not have a stroke appropriate for thrombolysis.

Methods

We conducted a retrospective review of the discharge diagnoses of all patients who presented to our emergency department as a Code Stroke. A patient was considered a stroke mimic if a stroke code was activated, but none of the first 3 International Classification of Diseases, Ninth Revision codes on discharge were transient ischemic attack–related or ischemic stroke–related.

Results

A total of 411 patients presented to the emergency department as Code Stroke. In all, 104 (25.3%) were discharged without a diagnosis of stroke or transient ischemic attack. The diagnoses in this group were intracranial hemorrhage in 19 patients, subarachnoid hemorrhage 6, subdural hematoma 3, old deficit 11, hypotension 11, seizure 10, intoxication 8, hypoglycemia 7, mass lesion 6, migraine 5, and other 18. In all, 33 of 307 eligible patients (10.7%) were treated with tissue-type plasminogen activator. None of the patients with a stroke mimic received tissue-type plasminogen activator. In 44 of 104 stroke mimics (42.3%), the acute disease was caused by a severe neurologic condition other than ischemic cerebrovascular disease. Only 60 of 411 stroke codes (14.6%) were initiated for patients without a severe and acute neurologic condition.

Conclusions

In our community, 25.5% of all Code Strokes were initiated for stroke mimics. Most mimic patients had an illness likely to benefit from urgent neurologic evaluation.

Section snippets

Methods

We reviewed records of all Code Stroke activations at our institution during a 31-month span. The patients were identified using the MIDAS (medical information data analysis system) database, which contains data on every stroke admission to our hospital network. We collected the following data on each patient: age, sex, race, and the first 3 International Classification of Diseases, Ninth Revision (ICD-9)–coded discharge diagnoses.5

We analyzed data on the subset of patients for whom a Code

Results

A total of 411 patients presented to the emergency department as Code Stroke from September 1998 to March 2001. Of these patients, 104 (25.3%) were stroke mimics: patients who were discharged without an ICD-9 coding consistent with ischemic cerebrovascular disease. Demographics are listed in Table 1; the differences were not statistically significant. The distribution of diagnoses is shown in Table 2. The most frequent mimic of ischemic stroke was hemorrhage: intracranial hemorrhage (ICH),

Discussion

We found that 25.3% of Code Strokes are activated in patients without acute ischemic cerebrovascular disease, consistent with previous data reporting stroke mimics in 13% and 19%.8, 9 In these studies not all patients were included within 24 hours, hemorrhagic and ischemic stroke were grouped together, and no structured Code Stroke system was used.10, 11 Asimos et al12 reported tPA treatment in 25% of Code Stroke activations and only 8% in stroke mimics.

By focusing on ischemic stroke and

References (20)

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