Temporary arterial occlusion in the repair of ruptured intracranial aneurysms: an analysis of risk factors for stroke

2002 ◽  
Vol 97 (4) ◽  
pp. 836-842 ◽  
Author(s):  
Richard Ferch ◽  
Alberto Pasqualin ◽  
Giampietro Pinna ◽  
Franco Chioffi ◽  
Albino Bricolo
Keyword(s):  
Risk Factors ◽  
Stroke Risk ◽  
Surgical Repair ◽  
Univariate Analysis ◽  
Arterial Occlusion ◽  
Patient Specific ◽  
Clinical Grade ◽  
Vessel Occlusion ◽  
Content Type ◽  
Fine Print

Object. This study was performed to further elucidate technical and patient-specific risk factors for perioperative stroke in patients undergoing temporary arterial occlusion during the surgical repair of their aneurysms. Methods. One hundred twelve consecutive patients in whom temporary arterial occlusion was performed during surgical repair of an aneurysm were retrospectively analyzed. Confounding factors (inadvertent permanent vessel occlusion and retraction injury) were identified in six cases (5%) and these were excluded from further analysis. The demographics for the remaining 106 patients were analyzed with respect to age, neurological status, aneurysm characteristics, intraoperative rupture, duration of temporary occlusion, and number of occlusive episodes; end points considered were outcome at 3-month follow up and symptomatic and radiological stroke. Conclusions. Overall 17% of patients experienced symptomatic stroke and 26% had radiological evidence of stroke attributable to temporary arterial occlusion. A longer duration of clip placement, older patient age, a poor clinical grade (Hunt and Hess Grades IV–V), early surgery, and the use of single prolonged clip placement rather than repeated shorter episodes were associated with a higher risk of stroke based on univariate analysis. Intraoperative aneurysm rupture did not affect stroke risk. On multivariate analysis, only poorer clinical grade (p = 0.001) and increasing age (p = 0.04) were significantly associated with symptomatic stroke risk.

Risk factors for ischemic lesions following aneurysmal subarachnoid hemorrhage

2005 ◽  
Vol 102 (2) ◽  
pp. 194-201 ◽  
Author(s):  
Seppo Juvela ◽  
Jari Siironen ◽  
Joona Varis ◽  
Kristiina Poussa ◽  
Matti Porras
Keyword(s):  
Risk Factors ◽  
Subarachnoid Hemorrhage ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Univariate Analysis ◽  
Delayed Cerebral Ischemia ◽  
Artery Occlusion ◽  
Ct Scans ◽  
Content Type ◽  
Fine Print

Object. The aim of this study was to test whether enoxaparin treatment (40 mg subcutaneously once daily) reduces the risk of cerebral infarction after subarachnoid hemorrhage (SAH) and to investigate predictive risk factors for permanent ischemic lesions visible on follow-up computerized tomography (CT) scans obtained 3 months after SAH. Methods. After undergoing surgery for a ruptured aneurysm, 170 patients were randomized in a prospective, double-blind, placebo-controlled trial to test the effect of enoxaparin on the occurrence of ischemic lesions, which were demonstrated on follow-up CT scans available for 156 patients. The presence of lesions correlated highly with an impaired outcome, as assessed using both the Glasgow Outcome and modified Rankin Scales (p < 0.01). Lesions occurred in 101 (65%) of the 156 patients. In half of the patients (51 patients) no lesion was visible on the CT scan obtained on the 1st postoperative day in 51 patients. On univariate analysis, the presence of lesions at 3 months post-SAH was not associated with enoxaparin treatment but did correlate with several clinical, radiological, and prehemorrhage variables. Significant independent risk factors for lesions consisted of an impaired initial clinical condition (odds ratio [OR] 2.63, 95% confidence interval [CI] 1.03–6.73), amount of subarachnoid blood (OR 6.51, 95% CI 2.27–18.65), nocturnal occurrence of SAH (that is, between 12:01 a.m. and 8:00 a.m.; OR 4.32, 95% CI 1.28–14.52), fixed symptoms of delayed ischemia (OR 5.21, 95% CI 1.02–26.49), duration of temporary artery occlusion during surgery (OR 1.66 per minute, 95% CI 1.20–2.31), and body mass index (OR 1.13/kg/m2, 95% CI 1.01–1.28). Conclusions The presence of ischemic lesions can be predicted by the severity of bleeding, delayed cerebral ischemia, excess weight, duration of temporary artery occlusion, and occurrence of nocturnal aneurysm rupture.

Gamma knife radiosurgery for renal cell carcinoma brain metastases

2002 ◽  
Vol 97 ◽  
pp. 489-493 ◽  
Author(s):  
Laura Hernandez ◽  
Lucia Zamorano ◽  
Andrew Sloan ◽  
James Fontanesi ◽  
Simon Lo ◽  
...  
Keyword(s):  
Renal Cell Carcinoma ◽  
Brain Metastases ◽  
Cell Carcinoma ◽  
Gamma Knife ◽  
Median Survival ◽  
Renal Cell ◽  
Univariate Analysis ◽  
Gamma Knife Radiosurgery ◽  
Content Type ◽  
Fine Print

Object. The purpose of this study was to clarify the effectiveness of gamma knife radiosurgery (GKS) in achieving a partial or complete remission of so-called radioresistant metastases from renal cell carcinoma (RCC) and to propose guidelines for optimal treatment Methods. During a 5-year period, 29 patients (19 male and 10 female) with 92 brain metastases from RCC underwent GKS. The median tumor volume was 4.7 cm3 (range 0.5–14.5 cm3). Fourteen patients (48%) also underwent whole-brain radiotherapy (WBRT) before GKS, and two patients (6.8%) after GKS. The mean GKS dose delivered to the 50% isodose at the tumor margin was 16.8 Gy (range 13–30 Gy). All cases were categorized according to the Recursive Partitioning Analysis (RPA) classification for brain metastases. Univariate analysis was performed to determine significant prognostic factors and survival. The overall median survival was 7 months after GKS treatment. Age, sex, Karnofsky Performance Scale score, and controlled primary disease were not predictors of survival. Combined WBRT/GKS resulted in median survival of 18, 8.5, and 5.3 months for RPA Classes I, II, and III, respectively, compared with the median survival 7.1, 4.2, and 2.3 months for patients treated with WBRT alone. Conclusions. These results suggest that WBRT combined with GKS may improve survival in patients with brain metastases from RCC. Furthermore, this improvement in survival was seen in all RPA classes.

Risk of late stroke and survival following carotid endarterectomy procedures for symptomatic patients

1990 ◽  
Vol 73 (2) ◽  
pp. 193-200 ◽  
Author(s):  
Dennis A. Turner ◽  
Jay Tracy ◽  
Stephen J. Haines
Keyword(s):  
Carotid Endarterectomy ◽  
Life Table ◽  
Stroke Risk ◽  
Neurological Symptoms ◽  
Treatment Modalities ◽  
Control Group ◽  
Content Type ◽  
Postoperative Stroke ◽  
Fine Print

✓ The long-term outcome following carotid endarterectomy for neurological symptoms was analyzed using a retrospective life-table approach in 212 patients who had undergone 243 endarterectomy procedures. The postoperative follow-up period averaged 38.9 ± 2.1 months (mean ± standard error of the mean). The endpoints of stroke and death were evaluated in these patients. Patient groups with the preoperative symptoms of amaurosis fugax, transient ischemic attack, and prior recovered stroke were similar in terms of life-table outcome over the follow-up period. Sixty-two percent of symptomatic patients were alive and free of stroke at 5 years. The late risk of stroke (after 30 days postoperatively) averaged 1.7% per year based on a linear approximation to the hazard at each life-table interval (1.3% per year for ipsilateral stroke). The trend of late stroke risk was clearly downward, however, and could be fitted more accurately by an exponential decay function with a half-life of 33 months. Thus, the risk of stroke following carotid endarterectomy for neurological symptoms was highest in the perioperative period, slowly declined with time, and occurred predominantly ipsilateral to the procedure. The definition of a prospective medical control group remains crucial for a critical analysis of treatment modalities following the onset of premonitory neurological symptoms. In the absence of an adequate control group for this series, the calculated perioperative and postoperative stroke risk from this study was compared to data obtained from the literature on stroke risk in medically treated symptomatic patients. This uncontrolled comparison of treatment modalities suggests the combined perioperative and postoperative stroke risk associated with carotid endarterectomy to be modestly improved over medical treatment alone.

Upper basilar artery aneurysms: oculomotor outcomes in 163 cases

2005 ◽  
Vol 102 (3) ◽  
pp. 482-488 ◽  
Author(s):  
Hisham Al-Khayat ◽  
Haitham Al-Khayat ◽  
Jonathan White ◽  
David Manner ◽  
Duke Samson
Keyword(s):  
Basilar Artery ◽  
Nerve Palsy ◽  
Arterial Occlusion ◽  
Oculomotor Nerve ◽  
Oculomotor Nerve Palsy ◽  
Stepwise Logistic Regression ◽  
Categorical Data Analysis ◽  
Content Type ◽  
History Of ◽  
Fine Print

Object. The purpose of this study was to identify factors predictive of postoperative oculomotor nerve palsy among patients who undergo surgery for distal basilar artery (BA) aneurysms. The data can be used to estimate preoperative risk in this population. The natural history of oculomotor nerve palsy in patients with good outcomes is also defined. Methods. The cases of 163 patients with distal BA aneurysms, who were treated surgically between 1996 and 2002, were retrospectively studied to identify factors contributing to oculomotor nerve palsy. After the data had been collected, stepwise logistic regression procedures were used to determine the predictive effects of each variable on the development of oculomotor nerve palsy and to create a scoring system. Factors that interfered with resolution of oculomotor dysfunction in patients with good outcomes were also studied. Postoperative oculomotor nerve palsy occurred in 86 patients (52.8%) with distal BA aneurysms. The following factors were associated with postoperative oculomotor dysfunction, as determined by a categorical data analysis: 1) younger patient age (p < 0.001); 2) poor admission Hunt and Hess grade (p < 0.001); 3) use of temporary arterial occlusion (p < 0.001); 4) poor Glasgow Outcome Scale score (p < 0.001); and 5) the presence of a BA apex aneurysm that projected posteriorly (p < 0.001). For patients with good outcomes, postoperative oculomotor nerve palsy resolved completely within 3 months in 31 patients (52%) and within 6 months in 47 patients (80%). The projection of the BA aneurysm was associated with incomplete oculomotor recovery at 6 months postoperatively (p = 0.019). Conclusions. The results of this study can help identify patients with a high risk for the development of oculomotor nerve palsy. This may help neurosurgeons in preoperative planning and discussions.

New directions in bioabsorbable technology

2002 ◽  
Vol 97 (4) ◽  
pp. 481-489 ◽  
Author(s):  
Stephen M. Warren ◽  
Marc H. Hedrick ◽  
Karl Sylvester ◽  
Michael T. Longaker ◽  
Constance M. Chen
Keyword(s):  
Interdisciplinary Approach ◽  
Patient Specific ◽  
Therapeutic Gene ◽  
Content Type ◽  
Tissue Constructs ◽  
New Directions ◽  
Material Sciences ◽  
Specific Tissue ◽  
Tissue Restoration ◽  
Fine Print

✓ Generating replacement tissues requires an interdisciplinary approach that combines developmental, cell, and molecular biology with biochemistry, immunology, engineering, medicine, and the material sciences. Because basic cues for tissue engineering may be derived from endogenous models, investigators are learning how to imitate nature. Endogenous models may provide the biological blueprints for tissue restoration, but there is still much to learn. Interdisciplinary barriers must be overcome to create composite, vascularized, patient-specific tissue constructs for replacement and repair. Although multistep, multicomponent tissue fabrication requires an amalgamation of ideas, the following review is limited to the new directions in bioabsorbable technology. The review highlights novel bioabsorbable design and therapeutic (gene, protein, and cell-based) strategies currently being developed to solve common spine-related problems.

Decompressive craniectomy in a rat model of “malignant” cerebral hemispheric stroke: experimental support for an aggressive therapeutic approach

1996 ◽  
Vol 85 (5) ◽  
pp. 853-859 ◽  
Author(s):  
Arnd Doerfler ◽  
Michael Forsting ◽  
Wolfgang Reith ◽  
Christian Staff ◽  
Sabine Heiland ◽  
...  
Keyword(s):  
Cerebral Ischemia ◽  
Decompressive Craniectomy ◽  
Control Group ◽  
Acute Ischemia ◽  
Vessel Occlusion ◽  
Content Type ◽  
Time Points ◽  
Infarction Size ◽  
Mca Occlusion ◽  
Fine Print

✓ Acute ischemia in the complete territory of the carotid artery may lead to massive cerebral edema with raised intracranial pressure and progression to coma and death due to uncal, cingulate, or tonsillar herniation. Although clinical data suggest that patients benefit from undergoing decompressive surgery for acute ischemia, little data about the effect of this procedure on experimental ischemia are available. In this article the authors present results of an experimental study on the effects of decompressive craniectomy performed at various time points after endovascular middle cerebral artery (MCA) occlusion in rats. Focal cerebral ischemia was induced in 68 rats using an endovascular occlusion technique focused on the MCA. Decompressive cranioectomy was performed in 48 animals (in groups of 12 rats each) 4, 12, 24, or 36 hours after vessel occlusion. Twenty animals (control group) were not treated by decompressive craniectomy. The authors used the infarct volume and neurological performance at Day 7 as study endpoints. Although the mortality rate in the untreated group was 35%, none of the animals treated by decompressive craniectomy died (mortality 0%). Neurological behavior was significantly better in all animals treated by decompressive craniectomy, regardless of whether they were treated early or late. Neurological behavior and infarction size were significantly better in animals treated very early by decompressive craniectomy (4 hours) after endovascular MCA occlusion (p < 0.01); surgery performed at later time points did not significantly reduce infarction size. The results suggest that use of decompressive craniectomy in treating cerebral ischemia reduces mortality and significantly improves outcome. If performed early after vessel occlusion, it also significantly reduces infarction size. By performing decompressive craniectomy neurosurgeons will play a major role in the management of stroke patients.

Clot volume and clearance rate as independent predictors of vasospasm after aneurysmal subarachnoid hemorrhage

2004 ◽  
Vol 101 (2) ◽  
pp. 255-261 ◽  
Author(s):  
Christopher Reilly ◽  
Chris Amidei ◽  
Jocelyn Tolentino ◽  
Babak S. Jahromi ◽  
R. Loch Macdonald
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Clearance Rate ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Quantitative Imaging ◽  
Univariate Analysis ◽  
Ct Scans ◽  
Focal Neurological Deficit ◽  
Content Type ◽  
Fisher Grade ◽  
Fine Print

Object. This study was conducted for two purposes. The first was to determine whether a combination of measurements of subarachnoid clot volume, clearance rate, and density could improve prediction of which patients experience vasospasm. The second was to determine if each of these three measures could be used independently to predict vasospasm. Methods. Digital files of the cranial computerized tomography (CT) scans obtained in 75 consecutive patients admitted within 24 hours of subarachnoid hemorrhage (SAH) were analyzed in a blinded fashion by an observer who used quantitative imaging software to measure the volume of SAH and its density. Clot clearance rates were measured by quantifying SAH volume on subsequent CT scans. Vasospasm was defined as new onset of a focal neurological deficit or altered consciousness 5 to 12 days after SAH in the absence of other causes of deterioration, diagnosed with the aid of or exclusively by confirmatory transcranial Doppler ultrasonography and/or cerebral angiography. Univariate analysis showed that vasospasm was significantly associated with the SAH grade as classified on the Fisher scale, the initial clot volume, initial clot density, and percentage of clot cleared per day (p < 0.05). In multivariate analysis, initial clot volume and percentage of clot cleared per day were significant predictors of vasospasm (p < 0.05), whereas Fisher grade and initial clot density were not. Conclusions. Quantitative analysis of subarachnoid clot shows that vasospasm is best predicted by initial subarachnoid clot volume and the percentage of clot cleared per day.

Posttraumatic vertigo

1979 ◽  
Vol 51 (6) ◽  
pp. 860-861 ◽  
Author(s):  
George B. Jacobs ◽  
Joel F. Lehrer ◽  
Robert C. Rubin ◽  
John H. Hubbard ◽  
Donald J. Nalebuff ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Surgical Repair ◽  
Surgical Intervention ◽  
Direct Result ◽  
Content Type ◽  
Course Of Illness ◽  
Sensory Neural ◽  
Fluctuating Hearing Loss ◽  
Sensory Neural Hearing Loss ◽  
Fine Print

✓ Posttraumatic vertigo may be an accompanying symptom associated with concussion and with the post-concussion state. It is possible, however, that these symptoms are related to perilymphatic fistulas and are not the direct result of cerebral concussion. Although many fistulae heal spontaneously, patients with persistent vertigo and fluctuating hearing loss following head trauma may have associated defects in the perilymphatic channels with fistulas in the region of the oval or round windows. This paper presents results of surgical repair in three patients with fistulas. Surgical intervention becomes much more urgent when sensory neural hearing loss has occurred acutely or has developed during the course of illness.

Selection and combination of various endovascular techniques in the treatment of giant aneurysms

1992 ◽  
Vol 77 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Waro Taki ◽  
Shogo Nishi ◽  
Kohsuke Yamashita ◽  
Akiyo Sadatoh ◽  
Ichiro Nakahara ◽  
...  
Keyword(s):  
Arterial Occlusion ◽  
The Other ◽  
Parent Artery ◽  
Endovascular Techniques ◽  
Detachable Balloon ◽  
Content Type ◽  
Ethylene Vinyl Alcohol ◽  
Complete Occlusion ◽  
Giant Aneurysms ◽  
Fine Print

✓ Between April, 1989, and January, 1991, a total of 19 cases of giant aneurysm were treated by the endovascular approach. The patients included seven males and 12 females aged 15 to 72 years. Detachable balloons, occlusion coils, and ethylene vinyl alcohol copolymer liquid were used as embolic materials. In seven cases, thrombosis of the aneurysmal sac and/or base was achieved while sparing the parent arterial flow; complete obliteration of the aneurysm was achieved in four of these. Of these four patients, the thrombotic material was a detachable balloon in two, a combination of a detachable balloon and coils in one, and occlusion liquid in one. In the other three cases, complete occlusion was not achieved; one aneurysm was occluded with a detachable balloon and two with coils. In 11 patients, the parent artery was occluded either by trapping or by proximal arterial occlusion, and all patients showed complete occlusion of the aneurysms. In one patient, a combined bypass procedure and parent artery occlusion was performed. Among the 19 cases in this series there were four transient ischemic attacks, one reversible ischemic neurological deficit, and one death due to aneurysmal rupture during the procedure. Two patients died in the follow-up period, one from pneumonia 2 months postoperatively and the other from acute cardiac failure 2 weeks following surgery. Both deaths were unrelated to the endovascular procedure. It is concluded that the endovascular treatment of giant aneurysms remains difficult because of the large and irregular shape of the aneurysmal base and thrombus in the aneurysmal sac. The proper selection and combination of the available endovascular techniques is therefore of critical importance.

Bacterial meningitis caused by the use of ventricular or lumbar cerebrospinal fluid catheters

2005 ◽  
Vol 102 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Rogier P. Schade ◽  
Janke Schinkel ◽  
Leo G. Visser ◽  
J. Marc C. van Dijk ◽  
Joan H. C. Voormolen ◽  
...  
Keyword(s):  
Risk Factors ◽  
Cerebrospinal Fluid ◽  
Bacterial Meningitis ◽  
Clinical Symptoms ◽  
External Drainage ◽  
Content Type ◽  
Ventricular Catheters ◽  
Independent Risk Factors ◽  
Lumbar Cerebrospinal Fluid ◽  
Fine Print

Object. In the present study the authors compared the incidence and risk factors for external drainage—related bacterial meningitis (ED-BM) by using ventricular and lumbar catheters. Methods. A cohort of 230 consecutive patients with ED was evaluated. Cerebrospinal fluid samples were obtained daily for microbiological culture, and ED-BM was defined based on culture results in combination with clinical symptoms. The incidence of ED-BM was 7% in lumbar and 15% in ventricular drains. Independent risk factors included site leakage, drain blockage, and most importantly duration of ED. Despite a higher infection rate, ventricular catheters did not have a significant higher risk of infection after correcting for duration of drainage. Conclusions. Analysis of data in the present study showed that the incidence of ED-associated death is low (0.45%) in patients who do not receive continuous antibiotic prophylaxis during ED.

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