(Stroke. 1995;26:1764-1767.)
© 1995 American Heart Association, Inc.
Articles |
From the Departments of Neurology (A.I.Q., K.S., C.B., D.L.B., B.M., M.R.F.), Medicine (E.J.W.), and Neurosurgery (A.R.C.), Emory University School of Medicine, Atlanta, Ga.
Correspondence to Michael R. Frankel, MD, Chief of Neurology, Grady Memorial Hospital, 80 Butler St SE, PO Box 26036, Atlanta, GA 30335.
| Abstract |
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Methods Clinical and demographic data were extracted from the
charts of 182 consecutive black Americans admitted for SICH diagnosed
by clinical criteria and initial CT scan. Hemorrhage volumes
were calculated from admission CT scans by a computerized method.
Univariate and multiple logistic regression
analyses were performed to determine independent predictors of
early deterioration (defined as a decrease from an initial Glasgow Coma
Scale score >12 by
4 points within 24 hours from
presentation) and mortality.
Results Both hemorrhage volume and
ventricular extension were significant, independent
predictors of early deterioration (odds ratio [OR], 6.78; 95%
confidence interval [CI], 1.89 to 24.35 and OR, 4.67; 95% CI, 1.30
to 16.72, respectively) and mortality (OR, 6.66; 95% CI, 2.85 to 15.58
and OR, 4.23; 95% CI, 1.82 to 9.82, respectively). A Glasgow Coma
Scale score
12 also predicted mortality (OR, 3.23; 95% CI, 1.46 to
7.14). Initial mean arterial pressure was not an
independent predictor of early deterioration or mortality.
Conclusions Hemorrhage volume and ventricular extension are the best predictors of early deterioration and mortality in black Americans with SICH.
Key Words: blacks intracerebral hemorrhage mortality racial differences tomography
| Introduction |
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| Subjects and Methods |
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Data Collection
Medical Records
In addition to age and sex, the following information was
extracted from the patients' charts and used for statistical
analyses. (1) We determined initial MAP,24
calculated by the equation MAP=Diastolic Blood Pressure+1/3
Pulse Pressure; we used the first blood pressure measured by a health
professional and documented in the chart. In most cases the initial
blood pressures were measured either by the Emergency Medical Service
personnel or by the triage nurse in the emergency department. (2) We
assessed neurological status at presentation using the
initial GCS25 score provided by the Emergency Medical
Service personnel or by the emergency department records. (3) Two
end points were assessed for each patient: early deterioration, defined
as a decline from an initial GCS score of >12 by
4 points within 24
hours from presentation, and mortality. GCS was monitored
approximately every 2 hours during the first 24 hours after admission.
Therapeutic interventions were determined to be medical or surgical.
Condition upon discharge was also recorded.
CT Scan Images
The following data were extracted by a single neurologist from
the patients' CT scans obtained at the time of admission. (1) The site
of hemorrhage was broadly classified into one of two groups:
supratentorial or infratentorial. (2) We determined
VE by assessing CT scans for the presence or absence of blood in the
ventricles. (3) ICHV was calculated by computerized image
analysis. Each CT image was placed on a light box, and after an
appropriate degree of clarity and brightness was obtained, an image was
captured by a camera, digitized, and reproduced on a video monitor. The
region of the hemorrhage was identified, and its borders were
approximated on the screen with electronic markers. The number of
pixels constituting the area of the hemorrhage was determined.
With the linear centimeter scale on each CT image, a calibration square
was used to determine the calibration factor (pixels per square
centimeter). The number of pixels of hemorrhage in an
individual CT slice was then divided by the calibration factor to
obtain real surface area measurements in square centimeters. The
surface area was multiplied by the image slice thickness (0.5 to 1.0
cm) to obtain a slice volume. Slice volumes were then added to obtain
the ICHV.
Statistical Analysis
Statistical analysis was performed with the use of
EPI INFO 5.126 and
SAS.27 First we performed
univariate analyses using EPI INFO to determine which variables significantly
predicted the outcomes of early deterioration and mortality.
Variables included age, sex, initial MAP (dichotomized as <140 or
140 mm Hg), site of hemorrhage (infratentorial or
supratentorial), VE (presence or absence of
ventricular blood), ICHV (<30 or
30 cm3),
and for mortality, initial GCS score (
12 or >12). To appreciate the
relative contributions of variables predicting early deterioration
and mortality, we performed a series of multiple logistic regressions
using the PROC LOGISTIC subprogram of
SAS.
| Results |
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Early Deterioration
A total of 95 patients presented with an initial GCS score
>12. Of these, 22 (23.1%) had early deterioration. The mean time from
presentation to early deterioration was 7.9±5.1 hours.
Results of the univariate analysis are shown in
Table 1
. The following three variables were
associated with early deterioration: MAP, VE, and ICHV. Results of the
multiple logistic regression analysis are shown in Table 2
. In this analysis, only VE and ICHV were
independently associated with early deterioration.
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Mortality
Of the 182 patients, mortality during hospitalization was 50.5%
(n=92). Of the patients who died, 45% died within the first 48 hours.
Univariate analyses showed the following
variables to be significantly associated with mortality: initial
MAP, GCS score, VE, and ICHV (Table 3
).
Multiple logistic regression analysis showed that only VE, GCS
score, and ICHV remained independently associated with mortality (Table 4
).
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| Discussion |
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In those studies of predominantly white patients, mortality ranges between 23% and 58%. Results of previous studies suggest that SICH may differ between white patients and black patients, according to risk of developing SICH,20 21 age of onset,18 20 and mortality.18 The present study is the largest study of outcomes in black Americans with SICH. Although this study does not examine risk factors for SICH, the mean age of onset and overall mortality for blacks with SICH were comparable to those in white populations.
Among our patients with SICH, 23.1% of those with an initial GCS score >12 underwent early deterioration. Although there are no published data on the prevalence of early deterioration, the Harvard Cooperative Stroke Registry found that 56% of all patients admitted with SICH (n=115) experienced further worsening and 25% of these deteriorated suddenly,3 a value similar to our own. The only variables independently predictive of early deterioration in our study are ICHV and VE.
Our overall mortality was 50.5%, a value within the range of previous
studies. Previous studies have shown that the best predictors of
mortality for patients with SICH are pulse pressure, GCS score, VE, and
ICHV (Table 5
). In the present study independent
predictors of mortality included VE, GCS score, and ICHV but not
initial MAP (Table 4
). This may be an important
difference between our study and those preceding ours. Carlberg et
al28 showed that elevated MAP at the time of admission was
associated with increased mortality, particularly in patients with
impaired consciousness. It is unclear to what extent our results may be
specific to blacks.
One limiting factor of this study is that the time from onset of SICH until presentation to the emergency department was not controlled. Because patients undoubtedly presented at different points in the natural history of SICH, some of our initial measurements may reflect in part the delay between onset and presentation. By using the earliest reliable measurements, this study has attempted to minimize the effect of time between onset and presentation, although one drawback of using such measurements is that there are multiple observers and no standardization of observations. Another limiting factor in this study is its retrospective design, which does not control prospectively for therapeutic interventions.
The most important finding of our study is that ICHV and VE are independent predictors of both early deterioration and mortality. As the treatment of SICH evolves, it will be necessary to determine which patients are most likely to benefit from new therapeutic options. This study suggests that among patients with an initial GCS score >12, ventricular bleeding and large ICHV are the most important predictors of early deterioration. Early recognition and treatment could potentially have the greatest impact in this subgroup of patients. These patients may therefore represent the best candidates for randomized clinical trials of novel therapeutic approaches.
| Selected Abbreviations and Acronyms |
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Received October 21, 1994; revision received June 30, 1995; accepted June 30, 1995.
| References |
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