Acute Venous Sinus Thrombosis Research Articles

Young patient with thunderclap headache, seizure activity, and fixed eye deviation.

A 39-year-old female with a history of iron deficiency anemia presented to the emergency department (ED) with a 3-hour history of severe headache followed by acute-onset projectile non-bilious, non-bloody vomiting, acute mental status change, and seizure-like activity. The onset of the headache was spontaneous and described as the worst headache of her life. Vomiting and seizure-like activity began several hours after the onset of headache, and emergency medical services (EMS) were called at that time. The patient was found to be unresponsive by EMS. Upon arrival to the ED, the physical examination was notable for fixed left eye deviation, intermittent withdrawal from noxious stimuli, and spells of sustained clonus in the lower extremities greater on the left than the right. The patient was given 2-mg intravenous lorazepam with minimal improvement in the tonic–clonic activity. The patient was hemodynamically stable and had an oxygen saturation of 98% on room air. Initial laboratory test results were significant for anemia (hemoglobin = 5.2 g/dL, hematocrit = 21%) and elevated platelets (426.5). Computed tomography (CT) of the head, CT angiogram of the head and neck, CT venogram of the head, and urgent neurology consult were obtained immediately after arrival to the ED. The patient continued to decline after CT and was intubated for airway protection. Imaging was suggestive of acute venous sinus thrombosis extending from the superior sagittal sinus to the right cranial jugular vein with no definite intracranial hemorrhage (Figures 1 and 2) and bilateral segmental and subsegmental pulmonary emboli (Figure 3). This case describes a typical presentation of cerebral venous sinus thrombosis (CVST). CVSTs are more commonly seen in women aged 30–50 years.1 Commonly, sinus thrombosis can lead to subarachnoid hemorrhage with a subsequent “thunderclap” headache that can lead to neurological symptoms.3 Neurology evaluated the patient in the ED, and the patient was taken to the operating room for an aspiration thrombectomy and started on a continuous heparin infusion. The patient had gradual improvement of symptoms after 1 week of inpatient care in the neurology intensive care unit. At discharge, she was started on indefinite anticoagulation and levetiracetam for seizure prophylaxis. Further workup showed no evidence of hypercoagulability, no recent trauma, and no oral contraceptive use. CVST is defined as occlusion of dural sinuses leading to decreased venous flow, an increase in intracranial pressure, decreased cerebral perfusion pressures, and dilation of the cerebral veins. Continued hypoperfusion can result in ischemic tissue damage, resulting in acute neurologic symptoms such as seizures, headaches, altered mental status, and increased intracranial pressure. Without treatment, the thrombus can damage vessel walls, increasing the chances of vessel rupture, leading to subarachnoid hemorrhages and decreased cerebrospinal fluid outflow.1 Common risk factors for CVSTs include recent trauma, malignancy, thrombophilia, infection, obesity, oral contraceptive use, and increased estrogen states such as pregnancy.2

Utility of Hounsfield unit and hematocrit values in the diagnosis of acute venous sinus thrombosis in unenhanced brain CTs in the pediatric population

Cerebral venous sinus thrombosis (CVST) is a recognized cause of childhood and neonatal stroke with high morbidity and mortality and a challenging diagnosis in the pediatric population. We hypothesize that measuring Hounsfield units (HU) of blood in venous sinuses is a more reliable method to diagnose CVST and that normalizing the measured HU in relation to the patient's hematocrit levels may further improve detection of CVST in the pediatric population. We performed a retrospective chart review of 15 pediatric patients with acute CVST and 31 control patients. Regions of interest (ROIs) were plotted to measure HU values within the venous sinuses of each patient. Hounsfield unit to hematocrit (HU:Hct) ratios were also calculated. In patients with CVST, HU values were determined in thrombosed and non-thrombosed venous sinuses. Statistical analysis was performed to calculate the differences between patient and control groups and to determine optimal cutoff values for HU and HU:Hct measurements in diagnosing CVST on non-contrast brain computed tomography (CT). A statistically significant difference in sinus attenuation and HU:Hct ratio was found between thrombosed (66.2±5.3 HU, 1.96±0.4) and non-thrombosed sinuses (47.2±4.5 HU, 1.38±0.25) in the patient group (P<0.0001), with the average attenuation difference being 19 HU. A statistically significant difference was also found between thrombosed sinuses in the patient group and sinuses (48.9±3.13 HU, 1.3±0.12) in the control group (P<0.0001). Optimal cutoff values of 58 HU and HU:Hct ratios of 1.4 lead to sensitivities of 100% in diagnosing CVST.

Canadian Stroke Best Practice Recommendations: Hyperacute Stroke Care Guidelines, Update 2015.

The 2015 update of the Canadian Stroke Best Practice Recommendations Hyperacute Stroke Care guideline highlights key elements involved in the initial assessment, stabilization, and treatment of patients with transient ischemic attack (TIA), ischemic stroke, intracerebral hemorrhage, subarachnoid hemorrhage, and acute venous sinus thrombosis. The most notable change in this 5th edition is the addition of new recommendations for the use of endovascular therapy for patients with acute ischemic stroke and proximal intracranial arterial occlusion. This includes an overview of the infrastructure and resources required for stroke centers that will provide endovascular therapy as well as regional structures needed to ensure that all patients with acute ischemic stroke that are eligible for endovascular therapy will be able to access this newly approved therapy; recommendations for hyperacute brain and enhanced vascular imaging using computed tomography angiography and computed tomography perfusion; patient selection criteria based on the five trials of endovascular therapy published in early 2015, and performance metric targets for important time-points involved in endovascular therapy, including computed tomography-to-groin puncture and computed tomography-to-reperfusion times. Other updates in this guideline include recommendations for improved time efficiencies for all aspects of hyperacute stroke care with a movement toward a new median target door-to-needle time of 30 min, with the 90th percentile being 60 min. A stronger emphasis is placed on increasing public awareness of stroke with the recent launch of the Heart and Stroke Foundation of Canada FAST signs of stroke campaign; reinforcing the public need to seek immediate medical attention by calling 911; further engagement of paramedics in the prehospital phase with prehospital notification to the receiving emergency department, as well as the stroke team, including neuroradiology; updates to the triage and same-day assessment of patients with transient ischemic attack; updates to blood pressure recommendations for the hyperacute phase of care for ischemic stroke, intracerebral hemorrhage, and subarachnoid hemorrhage. The goal of these recommendations and supporting materials is to improve efficiencies and minimize the absolute time lapse between stroke symptom onset and reperfusion therapy, which in turn leads to better outcomes and potentially shorter recovery times.

Acute venous sinus thrombosis induced by a jugular foramen neurinoma.

Acute venous sinus thrombosis induced by a jugular foramen neurinoma.

086 The utility of different imaging modalities in the acute evaluation of venous sinus thrombosis

Acute venous sinus thrombosis often enters into the differential diagnosis of acute thunderclap headache when sub arachnoid haemorrhage has been excluded. When the pretest probability of a sinus thrombosis is...

Severe anemia causing cerebral venous sinus thrombosis in an infant

Iron deficiency anemia is a common pediatric problem affecting up to 25% children worldwide. It has been linked with cerebral venous sinus thrombosis in the literature. We describe a 9-month-old child who had severe iron deficiency anemia and developed acute venous sinus thrombosis associated with minor infection. Treatment with anticoagulation was partially successful with persistent thrombosis after 3 months. We reviewed the current literature highlighting the association of anemia as a risk factor for development of stroke in children.