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Alejandro A Rabinstein

Publications and source records attributed to Alejandro A Rabinstein.

At least 19 recordsLinked to original sources
PubMed2026

MRI-Negative Posterior Reversible Encephalopathy Syndrome: Comparison of Hypertensive Encephalopathy With and Without Vasogenic Edema.

OBJECTIVE: To explore whether posterior reversible encephalopathy syndrome (PRES) can present with negative magnetic resonance imaging (MRI) by comparing clinical features between cases of PRES with vasogenic edema and cases of hypertensive encephalopathy without MRI changes. PATIENTS AND METHODS: Patients diagnosed with hypertensive encephalopathy from August 1, 2008, to December 31, 2017, were identified retrospectively and matched by age (±5 years) and sex in a 1:2 ratio to patients retrospectively identified as having PRES from January 1, 2002, to November 30, 2017. A review of MRI images and clinical information was performed. RESULTS: We identified 16 cases of hypertensive encephalopathy and 32 age- and sex-matched controls with PRES showing vasogenic edema on MRI. There were no statistically significant differences in the odds of presentation with headache (odds ratio [OR], 1.372; 95% CI, 0.458 to 4.106), encephalopathy (OR, 2.303; 95% CI, 0.433 to 12.236), visual disturbance (OR, 0.826; 95% CI, 0.185 to 3.697), or focal neurologic deficit (OR, 4.000; 95% CI, 0.767 to 20.872). Seizures were more common in patients with vasogenic edema (OR, 0.082; 95% CI, 0.010 to 0.664). There were no significant differences in odds of acute kidney injury (OR, 2.90; 95% CI, 0.679 to 12.449) or odds of having a history of malignancy (OR, 0.295; 95% CI, 0.076 to 1.152), transplantation (OR, 3.347; 95% CI, 0.594 to 18.880), or autoimmune disease (OR, 0.400; 95% CI, 0.104 to 1.532). Systolic blood pressure at presentation was higher in patients with hypertensive encephalopathy and negative MRI as compared with patients with PRES and vasogenic edema (OR, 1.03; 95% CI, 1.01 to 1.05). CONCLUSION: Most presenting symptoms and risk factors were not significantly different between cases of hypertensive encephalopathy with and without vasogenic edema, arguing that the diagnosis of PRES in the setting of acute severe hypertension may not depend on MRI confirmation.

Humans↗
PubMed2006

Determinants of outcome in anticoagulation-associated cerebral hematoma requiring emergency evacuation.

OBJECTIVE: To analyze the likelihood of recovery and prognostic factors in patients with massive anticoagulation-associated intracerebral hemorrhage treated with surgical evacuation after reversal of anticoagulation. DESIGN: Retrospective case series. SETTING: Neurological-Neurosurgical Intensive Care Unit at Mayo Clinic. Patients Seventeen consecutive patients with large anticoagulation-associated intracerebral hemorrhage. Intervention Surgical evacuation of intracerebral hemorrhage. Main Outcome Measure Functional outcome was assessed using the modified Rankin scale. RESULTS: Before surgery, all patients had pronounced (>1-cm) shift of the septum pellucidum and one third had clinical signs of uncal herniation. Still, favorable outcome (modified Rankin scale score < or =3) was achieved by 11 patients (65%). All patients with good recovery awoke within 36 hours of surgery. Older age (P = .05) and serious systemic complications after surgery (P<.01) were significantly associated with lack of neurological recovery and fatal outcome. CONCLUSIONS: Emergency surgery for select deteriorating patients with large anticoagulation-associated intracerebral hemorrhage is compatible with favorable outcome despite the presence of clinical and radiological signs of herniation before the evacuation.

Aged↗
PubMed2006

Treatment of cerebral edema.

BACKGROUND: Cerebral edema is a potentially devastating complication of various acute neurologic disorders. Its successful treatment may save lives and preserve neurologic function. REVIEW SUMMARY: Different pathophysiological mechanisms are responsible for the formation of cytotoxic and vasogenic edema. Yet, these 2 types of edema often coexist and their treatment tends to overlap, with the exception of corticosteroids, which should be only used to ameliorate vasogenic edema. Currently available to control brain swelling include osmotic agents (with emphasis on mannitol and hypertonic saline solutions), corticosteroids, hyperventilation, sedation (propofol, barbiturates), neuromuscular paralysis, hypothermia, and surgical interventions. This article discusses the indications, advantages, and limitations of each treatment modality following an evidence-based approach. CONCLUSIONS: The therapy for brain edema remains largely empirical. More research aimed at enhancing our understanding of the pathophysiology of cerebral edema is needed to identify new and more effective forms of treatment.

Anti-Inflammatory Agents↗
PubMed2006

Serotonin syndrome from the interaction of cyclobenzaprine with other serotoninergic drugs.

Serotonin syndrome is a potentially lethal adverse drug reaction that may occur in patients taking proserotoninergic medications. Drug interactions are often responsible for the causation of this syndrome. We report two cases of severe serotonin syndrome induced by the administration of cyclobenzaprine in postoperative patients already receiving another proserotoninergic drug (phenelzine in one case and duloxetine in the other). In both cases, symptoms of autonomic instability and severe agitation started within hours of initiation of cyclobenzaprine and fully resolved within 3 days after discontinuing the proserotoninergic drugs. We conclude that cyclobenzaprine should be used with extreme caution in patients receiving other serotonin-enhancing drugs; these patients should be closely monitored for manifestations of serotonin syndrome.

Aged↗
PubMed2006

Hypotension and transient renal impairment induced by lumbar puncture.

INTRODUCTION: Raised intracranial pressure (ICP) may induce hypertension through sympathetic mechanisms. METHODS: Case report. RESULTS: A 55-year-old man was admitted with a symptomatic intracerebral mass and new refractory arterial hypertension. Several antihypertensive medications were necessary to control his blood pressure. A lumbar puncture was performed for diagnostic purposes and raised opening pressure (42 cm H2O) denoted raised ICP. After cerebrospinal fluid extraction, the closing pressure dropped to normal level. Shortly after the lumbar puncture, a sudden and pronounced drop in blood pressure was noted. Over the next day, the patient's serum creatinine rose from 0.9 to 1.9 mg/dL. Blood pressure normalized after discontinuation of all antihypertensive drugs and administration of intravenous fluids. Renal function also completely recovered within 2 days. The patient remained spontaneously normotensive thereafter. CONCLUSION: Sudden hypotension may occur after lumbar puncture in patients with raised ICP receiving treatment for arterial hypertension.

Acute Kidney Injury↗
PubMed2006

Surgery for intracerebral hematoma: the search for the elusive right candidate.

The value of surgery for patients with intracerebral hemorrhage (ICH) remains a topic of debate. Although several studies have been unable to prove the benefit of surgical intervention of ICH, there is available evidence to suggest that some patients may experience favorable outcome with surgery. Identifying optimal candidates and the timing of surgery for the treatment of ICH are crucial issues. Studies have explored the value of early and ultra-early surgical intervention, as well as the role of stereotactic hematoma evacuation. The International Surgical Trial in Intracerebral Hemorrhage suggested that favorable surgical outcome was more likely for patients with superficial hematomas, and patients who underwent craniotomy in the trial seemed to fare better than those treated with other surgical techniques. A retrospective study of patients with brain tissue shift has provided evidence that surgery may benefit some deteriorating patients; treatment decisions in this patient population should be based on case-by-case assessments of the likelihood of recovery after evacuation. It is critical that therapeutic alternatives for patients with ICH continue to be explored.

Animals↗
PubMed2005

Stroke etiology among Haitians living in Miami.

The black Caribbean population continues to grow in the US and little is known about stroke etiologies in that community. We examined stroke subtypes in 175 consecutive Haitian-born patients living in Miami, admitted for acute stroke. Ischemic stroke was diagnosed in 72%. Small vessel occlusion was the most frequent stroke subtype. There was a high prevalence of hypertension, medication noncompliance and intracranial atherosclerosis. Hypertension was the only cardiovascular risk factor significantly associated with small vessel infarction when compared with non-small vessel infarcts.

Age Factors↗
PubMed2005

Patterns of cerebral infarction in aneurysmal subarachnoid hemorrhage.

BACKGROUND AND PURPOSE: The aim of this study was to analyze the distribution patterns of delayed cerebral ischemia after subarachnoid hemorrhage (SAH) and the factors that determine their occurrence. METHODS: We analyzed clinical and radiological data of 143 consecutive patients with aneurysmal SAH. Computed tomography scan revision was blinded to clinical information. Superficial infarctions were defined as territorial lesions with cortical involvement. Perioperative infarctions were excluded. RESULTS: Fifty-six patients (39%) had cerebral infarctions. They were unilateral in 34 patients (61%) and involved a single territory in 29 (52%). Location was cortical in 34 patients (61%), deep in 10 (18%), and combined cortical and deep in 12 (21%). Single infarctions were cortical in 23 of 28 cases (79%). Deep territory ischemia was more common with multiple lesions (16/28, 57% versus 6/29 with single lesions, 21%; P<0.01). Single infarctions occurred frequently in the territory of the ruptured aneurysm (22/28 patients; 79%), whereas multiple infarctions were often distant to the site of rupture (21/28 cases, 75%). History of diabetes (P=0.05), early hydrocephalus (P=0.05), and requirement of external ventricular drainage (P=0.02) were associated with the occurrence of multiple infarctions on univariate analysis. On multivariable analysis, this association only remained significant for the requirement of external ventricular drainage. CONCLUSIONS: The 2 most common patterns of delayed cerebral ischemia after aneurysmal SAH are single cortical infarction, typically near the ruptured aneurysm, and multiple widespread lesions including subcortical locations and often unrelated to the site of aneurysm rupture. These 2 patterns may represent different pathophysiological mechanisms or different degrees of severity of the same vascular process.

Adult↗
PubMed2005

Diffusion-weighted magnetic resonance imaging in symptomatic vertebrobasilar atherosclerosis and dissection.

BACKGROUND: Acute multiple brain infarction (AMBI) pattern on diffusion-weighted imaging (DWI) is associated with arterial and cardiac sources of embolism. The DWI characteristics of patients with stroke due to vertebrobasilar arterial dissection and atherosclerotic disease have not been reported in detail. OBJECTIVE: To describe the DWI stroke patterns in patients with posterior circulation occlusive disease to determine mechanisms of ischemia. DESIGN: Retrospective analysis of infarct patterns in patients with symptomatic vertebrobasilar disease. SETTING: Large community-based teaching hospital. PATIENTS: Patients admitted with stroke due to vertebrobasilar disease were identified retrospectively. Patients were included if DWI was obtained within 7 days of symptom onset. MAIN OUTCOME MEASURE: Infarct patterns were analyzed according to established templates of vascular territories. RESULTS: Eleven patients with vertebral dissection and 39 patients with atherothrombosis were identified. An AMBI pattern was present in 8 (72%) of 11 patients with arterial dissections and 25 (64%) of 39 patients with atherosclerotic disease (P = .48). Distal embolism to the terminal branches of the basilar artery occurred with equal frequency in both groups and was found in half of all cases. Isolated thalamic infarction did not occur. Pontine infarction was noted in 2 (18%) of 11 patients with dissections and 18 (46%) of 39 patients with atherosclerosis (P = .09). Cerebellar border zone involvement was found in 14 (36%) of 39 patients with atherosclerosis and 4 (37%) of 11 patients with dissections (P = .6). CONCLUSIONS: Large arterial disease is frequently associated with AMBI in the posterior circulation. The incidence of AMBI was comparable to that reported in the anterior circulation. This DWI study supports the importance of embolism as the main mechanism of infarction in patients with vertebrobasilar occlusive disease. On the basis of our experience, large-vessel vertebrobasilar disease rarely causes isolated small-vessel thalamic infarction.

Adult↗
PubMed2005

Update on respiratory management of critically ill neurologic patients.

Respiratory failure complicates a number of acute neurologic conditions, most notably neuromuscular diseases (eg, Guillain-Barré syndrome and myasthenia gravis) and stroke. In addition, pulmonary complications, particularly pneumonia and atelectasis, are fairly common in patients with these diagnoses; their prevention and early recognition are crucial to avoid detrimental consequences. This review discusses recent studies related to predictors of respiratory failure and pneumonia, strategies of respiratory care and ventilatory support, functional prognosis, and withdrawal of mechanical ventilation in patients with acute neuromuscular respiratory failure and stroke.

Critical Illness↗
PubMed2005

Cerebral Vasospasm in Subarachnoid Hemorrhage.

The treatment of vasospasm after subarachnoid hemorrhage remains a formidable challenge. The prompt recognition of this complication is essential to prevent ischemic damage. Initial orders should include adequate fluid and sodium supplementation to avoid volume depletion. Prophylactic hypervolemia is not effective in reducing the incidence of vasospasm and may be deleterious. Oral nimodipine (60 mg every 4 hours for 21 days) should be started on admission because it protects against delayed ischemic damage. Increasing blood flow velocities on serial transcranial Doppler studies are reliable indicators of early development of vasospasm. When symptomatic vasospasm occurs, hemodynamic augmentation therapy should be instituted. Crystalloids and colloids may be used to promote hypervolemia. Colloids may provide additional benefit by producing hemodilution. However, the rheological benefits of hemodilution may be offset by reduced oxygen carrying capacity when hematocrit drops below 28%. Hypertension may be induced by administering inotropic drugs and, in certain cases, cardiac output optimization using dobutamine also is necessary. When aggressive medical therapy fails to reverse ischemic deficits, prompt endovascular intervention is indicated. Focal vasospasm of larger vessels may be effectively treated with angioplasty and the benefits of this procedure are durable. Diffuse vasospasm involving smaller arterial branches may be treated with intra-arterial infusion of vasodilators, such as papaverine, verapamil, or nicardipine. Unfortunately, these dilatory effects tend to be short-lasting. In refractory cases, hypothermia may be considered, although value of this strategy remains largely unexplored.

Journal Article↗
PubMed2005

Risk of extubation failure in patients with myasthenic crisis.

INTRODUCTION: Weaning patients with myasthenic crisis (MC) from mechanical ventilation is often difficult, and the ideal time for extubation is often uncertain. However, little is known about the risk of extubation failure and the factors that may affect its occurrence. The goals of this study were to assess the risk of extubation failure in patients with MC and to determine which clinical variables may predict unsuccessful extubation. MATERIALS AND METHODS: Retrospective review of consecutive patients admitted for MC. Weaning method was categorized as T-piece or continuous positive airway pressure (i.e., T-piece trials not performed). Extubation failure was defined as need for reintubation or tracheostomy due to persistent neuromuscular insufficiency. Functional outcome was assessed using the modified Rankin score. RESULTS: We identified 26 episodes of MC in 20 patients. Median age was 42.1 years (range 14-83 years). Most patients were treated with immunomodulatory therapy (73%). There were seven episodes of extubation failure (prevalence rate 27%). Median time to reintubation was 36 hours. Older age (p = 0.05), atelectasis (p < 0.01), and pneumonia (p =0.02) were significantly associated with extubation failure. Patients with failed extubation had considerably prolonged intensive care unit stays (median 28 versus 7 days; p < 0.01) and hospital stays (median 40 versus 12 days; p < 0.01). CONCLUSION: Extubation failure may often complicate MC. Older age and development of pulmonary complications during mechanical ventilation increase the risk of extubation failure.

Adolescent↗
PubMed2004

Outcome of survivors of acute stroke who require prolonged ventilatory assistance and tracheostomy.

BACKGROUND AND PURPOSE: Mechanical ventilation after stroke is associated with high mortality. However, little is known about survivors who require prolonged ventilatory assistance and tracheostomy. Our goal was to assess the rate of pulmonary complication, effect of early tracheostomy and prognosis of patients with stroke requiring prolonged ventilatory support. METHODS: Retrospective review of 97 patients with stroke who required ventilatory assistance and tracheostomy admitted to a single teaching hospital between 1976 and 2000. Outcome was defined using the Glasgow Outcome Scale (GOS). RESULTS: Poor outcome (GOS 1-3) occurred in 74% of patients at 1 year and it was associated with older age (p = 0.03), prior history of brain damage (p = 0.02), and neurological worsening after intubation (p < 0.01). However, long-term functional recovery (GOS 4-5) was possible and more likely after strokes involving the posterior circulation (p = 0.03). Pulmonary complications were prevalent and more frequent before tracheostomy (68 vs. 20% after tracheostomy) but did not determine functional outcome. Mean duration of mechanical ventilation was 11 +/- 19 days and did not significantly differ between outcome groups. Early tracheostomy correlated with shorter ICU and hospital stays (p < 0.01 in both cases). CONCLUSIONS: Surviving patients with stroke who require prolonged ventilatory assistance and tracheostomy can have a better outcome than previously reported. Aggressive care is justified in patients who do not continue to deteriorate neurologically. Pulmonary complications are frequent but treatable. Early tracheostomy can shorten ICU and hospital stays and reduce costs.

Adult↗