Although middle cerebral artery (MCA) occlusion in the rat is often used to study focal cerebral ischemia, the model of ischemia affects the size and reproducibility of infarction. The purpose of this experiment was to methodically examine different preparations to determine the optimum focal cerebral ischemia model to produce a ...

PURPOSE: To experimentally evaluate a new self-anchoring vascular occlusion device suitable for use in large, high-flow vessels. MATERIALS AND METHODS: A basket-shaped occluding device consisting of a nitinol frame (with or without polyester threads) covered with Dacron was evaluated in the common iliac arteries and abdominal aortae of normal pigs. ...

Recent studies and literature reviews of temporomandibular disorders (TMD) do not strongly support the role of occlusal etiologic factors. For this paper we collected and classified studies dealing with occlusion as a contributing factor to TMD through reviews, and discussions of these difficulties and possible solutions. Related articles from 275 ...

BACKGROUND: Brief antecedent periods of coronary artery occlusion improve subsequent vessel patency in damaged and stenotic coronary arteries via release of adenosine from ischemic/reperfused myocardium and resultant adenosine receptor stimulation. However, the site of receptor stimulation-circulating blood-borne elements (ie, platelets) versus vessel-wall components of the culprit artery-remains unclear. If platelet ...

Respiratory-related evoked potentials (RREPs) have been elicited by inspiratory loads in adults and children. The RREP was recorded over the somatosensory region of the cerebral cortex. It was hypothesized that a RREP could be recorded by using expiratory occlusion. Electroencephalographic activity was recorded in adults from 14 scalp locations, referenced ...

Local intra-arterial fibrinolysis (LIF) is the best choice at present for treatment of acute vessel occlusion in the vertebrobasilar territory and also, in selected cases, in the carotid territory. In almost all cases angiography demonstrates the site of occlusion exactly and gives information about collateral circulation. Contrary to this common ...

Acute arterial occlusion may be caused by an embolus, thrombosis, or trauma. Vascular diseases can involve complications not limited to vascular-related areas and may require a multidisciplinary approach to diagnosis and treatment. An overview of acute arterial occlusion is presented, as well as a case study of an atypical presentation ...

BACKGROUND: We evaluated the ability of brain tissue oxygen pressure (PO2), carbon dioxide pressure (PCO2), and pH to detect regional ischemia produced by temporary brain artery occlusion, compared with a group without artery occlusion. METHODS: Patients undergoing craniotomy for cerebrovascular surgery were recruited for this study. A 0.5-mm-diameter probe was ...

BACKGROUND: Early detection of vascular impairments after free tissue transfers are essential to prevent flap failure. Near-infrared spectroscopy showed good promise to monitor flaps at deep levels successfully without being invasive. The purpose of this study was to test whether the INVOS 3100 cerebral oxymeter is capable of detecting circulatory ...

In this study, we compare the prognostic significance of hysterosalpingography (HSG) and laparoscopy for fertility outcome. In a prospective cohort study in 11 clinics participating in the Canadian Infertility Treatment Evaluation Study (CITES), consecutive couples who registered between 1 April 1984 and 31 March 1987 for the evaluation of subfertility ...

STUDY DESIGN: Report of a case of external iliac artery occlusion occurring as a rare complication of lumbar posterior spinal surgery. OBJECTIVE: To clarify the cause of this rare complication and recommend methods for preventing its recurrence. SUMMARY OF BACKGROUND DATA: Several cases of central retinal artery occlusion after posterior ...

BACKGROUND: The aim of this study was to find out whether intravenously administered heparin is distributed equally not only proximal but also distal to the arterial occlusion level in vascular reconstructive surgery. METHODS: Ten consecutive patients (7 men and 3 women) with an average age of 69.9 years (range, 51 ...

BACKGROUND AND PURPOSE: Activation of plasma protein C (PC) zymogen by thrombin-thrombomodulin at the endothelial surface is an important endogenous antithrombotic mechanism. It is unknown whether activated protein C (APC) is generated in vivo in the cerebrovasculature, because there is only limited thrombomodulin expression in human brain vascular endothelium. Therefore, ...

A 16-year-old Caucasian teenager developed fatigue, abdominal pain, pneumonia, and subsequently acute vascular occlusion of the left superficial femoral artery. Vascular assessment and heparin therapy lead to bone marrow aspiration and a diagnosis of acute promyelocytic leukemia. Treatment with chemotherapy prevented loss of limb and avoided further vascular surgery. Young ...

We simulated parent artery occlusion therapy for basilar head aneurysms to elucidate the hemodynamic changes induced by different occlusion sites and diameters of the posterior communicating arteries (PCom) as collateral pathways. A vascular model of the vertebrobasilar system with a basilar head aneurysm was constructed. Four types of occlusion were ...

The surgical cephalometric prediction tracing involving the alteration of the occlusal plane differs from the conventional surgical prediction tracing. When conventional surgical prediction is developed, the final occlusal plane is dictated by the occlusal plane of the mandible, with or without autorotation. The mandible (and therefore the mandibular occlusal plane) ...

Summary: We have treated 142 aneurysms with intrasaccular or parent artery occlusions. Selective intrasaccular occlusions were attempted on 109 cases. Total or subtotal saccular occlusion was achieved in 93 of 96 cases. lntrasaccular occlusion could not be achieved in 13 cases because of various reasons such as wide neck, branching ...

OBJECTIVES: We tested whether acute coronary occlusion interferes with arterial baroreceptor control of heart rate in humans. BACKGROUND: Subnormal baroreflex sensitivity (BRS) is an important risk indicator for sudden death. Animal research indicates that both chronic myocardial infarction and acute coronary occlusion impair baroreflex modulation of heart rate. METHODS: We ...

Selectin-mediated leucocyte accumulation is implicated in the pathogenesis of splanchnic artery occlusion. Sulfatide is recognized by P-selectin and blocks this adhesion molecule. We investigated the effects of sulfatide in rats subjected to splanchnic artery occlusion shock. Anaesthetized rats, subjected to total occlusion of the superior mesenteric artery and the coeliac ...

PURPOSE: To evaluate the accuracy of pulsed Doppler ultrasound (PDUS) and color Doppler ultrasound (CDUS) for the screening of arterial occlusive disease in the pelvis and lower extremities. METHODS: We studied 52 patients with intermittent claudication or lower extremity "coolness." Pulsed Doppler waveforms were measured in the inguinal and popliteal ...

Intraarterial thrombolytic therapy decreases mortality in the treatment of acute basilar artery occlusion. An acute decrease in cerebral blood flow (CBF) (<12 mL/100 g per minute) has been reported to invariably result in infarction. We report a case of acute basilar artery occlusion, recanalized within 90 minutes, with reversal of ...

Temporary artery occlusion is an effective way to reduce the detrimental effects of intraoperative aneurysm rupture and to facilitate aneurysm dissection. The major risk incurred is of cerebral infarction. Dilemmas in the use of this technique include the amount of time that arterial flow may be interrupted safely and whether ...

BACKGROUND: Transmyocardial laser revascularization has been used to treat patients with end-stage coronary artery disease that is not amenable to standard revascularization. Although there is evidence of angina relief and quality of life enhancement, there is little information concerning improvement in myocardial contractility. The purpose of this study was to ...

Giant middle cerebral artery (MCA) trifurcation aneurysms that cannot be excluded directly can be treated by flow inversion achieved by creation of an extracranial-intracranial bypass distal to the aneurysm, followed by occlusion of the parent vessel proximal to the aneurysm. As opposed to surgical occlusion, endovascular occlusion avoids dissection of ...

Patients were evaluated before and after arterial reconstruction surgery (1) to define the physiology of the digital microcirculation in chronic subcritical ischemia, (2) to demonstrate the short-term effects of successful arterial reconstruction on microvascular flow, and (3) to document the effects of surgery on symptoms, function, and health-related quality of ...

RATIONALE AND OBJECTIVES: The authors compared the postocclusion hyperemic responses of the brachial artery after occluding blood flow proximal to and distal to the studied area. MATERIALS AND METHODS: Response of the brachial artery to hypoxia was evaluated with duplex Doppler ultrasound in 13 healthy subjects. A pneumatic tourniquet was ...

The case of a man exposed during 25 years to vibration while maneuvering a heavy earth moving tractor is reported. The first clinical manifestation of hand-arm vibration syndrome was a bilateral Raynaud's phenomenon followed five years later by digital necrosis. The arteriography revealed a proximal and bilateral ulnar artery occlusion. ...

BACKGROUND/PURPOSE: Fetuses with congenital diaphragmatic hernia (CDH) who have a "poor prognosis" with postnatal treatment now can be identified on the basis of liver herniation, early diagnosis (before 25 weeks' gestation) and a low lung-to-head ratio (LHR). Because complete in utero repair proved unsuccessful for this group, the strategy of ...

Etiological investigation of a 15-year-old boy with left ophthalmic artery occlusion led us to a diagnosis of neurofibromatosis type I as there were numerous large cafe-au-lait spots, axillary freckling, and brain MRI changes consistent with a hamartoma. In light of the present case, ophthalmic artery occlusion may be a rare ...

BACKGROUND: Pulmonary injury occurs after vascular surgery, with xanthine oxidase (an oxidant generator) released from reperfusing liver and intestines mediating a significant component of this injury. Because halogenated anesthetics have been observed to enhance oxidant-mediated injury in vitro, the authors hypothesized that desflurane would increase alveolar-capillary membrane permeability mediated by ...

Our purpose was to study the effectiveness of thrombolytic therapy in treating acute, subacute, and chronic arterial occlusions in a multicenter retrospective study. Intraarterial urokinase infusion was performed in 235 patients for occluded native arteries. There were 70 (30%) with acute and 26 (5%) with subacute occlusions, and 141 (59%) ...

Two patients with acute occlusion of the middle cerebral artery (MCA) were treated with intravenous alteplase. Neurovascular monitoring, which was performed simultaneously via transcranial sonography, enabled precise documentation of MCA recanalization. This information was used to tailor the dosage and duration of alteplase treatment. Sonographic information concerning the arterial segments ...

Occlusion of the palmar arch vessels is rare, but it can occur in athletes and workers who subject their hands to repeated blunt trauma or gripping activities. A case report examines a baseball player who presented with classic symptoms of hypothenar hammer syndrome (occlusion of the ulnar artery due to ...

Ischemic osteonecrosis is a complication of certain traumatic and a number of idiopathic conditions. The course of the disease may result in collapse of the convex member of a joint and osteoarthritis, often requiring arthroplasty. Increasing incidence in young adults poses a challenge for development of long-term joint prostheses. Current ...

We report a case of progressive thrombotic occlusion of the left common iliac artery in a 41-year-old woman after anterior interbody fusion, which initially presented only as a sensation of numbness. Diagnosis was delayed until complete arterial occlusion occurred 36 h after surgery. A sensory deficit may be the only ...

BACKGROUND: To review clinical features of the occlusive splanchnic ischaemia syndromes with special emphasis on the diagnostic value of tonometry. METHODS: The English literature was reviewed with an emphasis on papers concerning anatomy and physiology of splanchnic perfusion, the clinical presentation and diagnostic procedures in occlusive splanchnic ischaemia syndromes. RESULTS: ...

The profunda femoris artery, the main nutritive artery of the thigh, has a great surgical significance. The high frequency of the occlusive arterial disease in the lower limbs caused by atherosclerosis, imposes as main therapy the reconstructive surgery. Because the profunda femoris artery remains patient in most of the cases ...

Since vertigo is known to be caused by vertebrobasilar arterial occlusive disease (ex. vertebrobasilar insufficiency; VBI), an electrophysiological study was performed to examine the effects of a unilateral vertebral artery (VA) occlusion on the neuronal activities of the medial vestibular nucleus (MVN) and vestibular ganglion (VG) in alpha-chloralose-anesthetized cats. Single ...

Occlusal plane position was analysed cephalometrically in 35 Klinefelter adults (47,XXY) and compared with 60 eugnath control males (46,XY). The significantly smaller angles between the occlusal plane and the cranial base (NSL-OLs) and between the occlusal plane and the Frankfort horizontal plane (Fr-OLs) were obtained in 47,XXY males (P < ...

OBJECTIVES: This study sought to elucidate the short-term efficacy and intermediate-term outcome of excimer laser recanalization of chronic coronary artery occlusions in patients in whom attempts at mechanical revascularization had failed. BACKGROUND: Recanalization of chronic coronary occlusions with the use of a mechanical guide wire fails in 30% to 50% ...

Extradural aneurysms have distinct characteristics from their intradural counterparts. Most extradural aneurysms cannot be treated by direct surgical exposure and clip ligation or by direct endovascular means without parent vessel sacrifice. Arterial occlusion with or without bypass grafting remains the traditional treatment. Controversy about the "best" or "proper" technique of ...

In the coronary circulation an ischaemic preconditioning obtained with two periods of 2.5 min each of occlusion of the left circumflex coronary artery alters the pattern of a coronary reactive hyperaemia which follows 15 s only of occlusion of the studied artery. The most remarkable change consists of a reduction ...

Occlusion of central venous access devices (CVADs) is not an uncommon problem duringlong-term parenteral nutrition. A number of techniques have been developed to deal with obstructed CVADs. This study investigated the effectiveness of the sodium hydroxide (NaOH) lock method for gradual CVAD occlusion. When a progressively declining flow was noticed, ...

PURPOSE: To determine the clinical effectiveness of parent artery occlusion of the carotid or vertebral artery by means of temporary proximal flow arrest and microcoils. METHODS: Nineteen parent artery occlusions (15 carotid, four vertebral) were performed in 19 patients who successfully passed a balloon test occlusion. In these patients, endovascular ...

PURPOSE: In this prospective study we investigated the site, occurrence, and development of stenoses and occlusions following recanalization of superficial femoral artery occlusions. METHODS: Recanalization of an occluded femoropopliteal artery was attempted in 62 patients. Follow-up examinations included clinical examination and color-flow duplex scanning at regular intervals. Arteriography was used ...

PURPOSE: To study the ability of CT angiography to show intracranial arterial occlusion and collateral blood flow in patients with acute stroke. METHODS: Twenty-one patients with acute nonhemorrhagic stroke were studied prospectively with conventional CT, CT angiography, and digital subtraction angiography. On the basis of CT angiographic findings, two neuroradiologists ...

This case report describes a rare but treatable complication of anterior lumbar surgery. The patient underwent a revision anterior fusion from L2 to S1. Complete thrombotic occlusion of the left iliac artery developed in the patient. Prompt recognition of vascular compromise and arterial bypass of the iliac system lead to ...

OBJECTIVES: An endovascular carotid balloon occlusion test with continuous intracranial monitoring by transcranial Doppler sonography was performed in 55 patients for prediction of tolerance of a required permanent occlusion of the carotid artery. METHODS: Blood flow velocities of the ipsilateral middle cerebral artery during occlusion were recorded and compared with ...

Aortoiliac occlusion due to atherosclerosis is known to occur in elderly people. Two unique cases are documented here in which aortoiliac occlusion was observed in young men. These patients had no identifiable risk factors for developing atherosclerotic thrombosis except for the lupus anticoagulant, an immunoglobulin associated with thromboembolic episodes. Although ...

The condylar path, the incisal path, and the cusp angle determine the amount of disocclusion during eccentric movement. In prosthodontics, the condylar path has been used as the main determinant of occlusion. However, the method to derive the incisal path and cusp angle from the condylar path is not known, ...