CT angiography diagnosis of spontaneous dissection of the superior mesenteric artery.
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Aortic Dissection↗
Biomedical subjects
S Torem
Publications and source records attributed to S Torem.
Salvage of the severely injured limb in children: a multidisciplinary approach.
Massive trauma to a limb, even in young children, may lead to loss of viability and function. A combination of open fracture with vascular, crush, and avulsion injury resulting in acute peripheral ischemia may place the extremity at risk of necrosis and imminent amputation. We suggest a combined, multidisciplinary approach that includes initial vascular repair and fractures fixation, with early institution of hyperbaric oxygen therapy.
Blood Vessels↗
Image-directed Doppler ultrasound in the diagnosis of lower-limb venous insufficiency.
Ninety-eight legs in 73 patients were evaluated with image-directed Doppler ultrasound for suspected chronic venous insufficiency. Examinations of the entire venous system were performed to determine lumen patency and valvular competence. Reflux during Valsalva maneuver in the femoral and great saphenous vein, and, after release of distal compression in the popliteal vein, indicated valvular incompetence. Twenty limbs had normal veins; Baker's cysts were found in three. Superficial venous insufficiency was found in 25 cases. Deep reflux, either alone or in combination with superficial reflux, was the predominant pathological feature (53 legs). Photoplethysmographic studies of the veins were performed on 24 limbs. Image-directed Doppler ultrasound was more successful in defining the exact site of venous incompetence and in detecting nonvenous pathology. By the combination of real-time imaging of the vein with gated Doppler sonography of flow, image-directed Doppler sonography is becoming the method of choice for the investigation of chronic venous insufficiency.
Adult↗
Lower limb ischaemia in primary antiphospholipid syndrome.
Primary antiphospholipid syndrome (PAPS) is an autoimmune disorder manifested by recurrent thrombosis in the venous and arterial system. We report a group of seven patients with lower limb ischaemia associated with PAPS. Four were male patients and three were females, with a mean age of 37 years. All had a previous deep vein thrombosis and the majority, five out of seven, had a prior cerebrovascular accident (CVA). Prolonged activated thromboplastin time was demonstrated in all our patients and PAPS was established by positive thromboplastin titration index, circulating anticoagulant index and increased anticardiolipin levels. Symptoms included claudication in three, rest pain in four and gangrene in five patients. Angiography demonstrated thrombosis of various segments of the arterial tree including: aorta, iliac, femoral and popliteal arteries. Two patients were treated conservatively and one by percutaneous transluminal angioplasty (PTA) of the distal aorta. A total of eleven vascular surgical procedures were performed in four patients resulting in early postoperative thrombosis (2h-30 days) in 10 cases. Only one graft remained patent, when full heparinisation (1000 units/h) was used perioperatively. We conclude that PAPS patients are at high risk for graft thrombosis and should only be operated upon on full anticoagulation, starting at operation and proceeding indefinitely.
Adolescent↗
[Trash foot following abdominal aortic surgery].
Peripheral embolism from dislodgement of intraarterial debris can convert successful surgery of the abdominal aorta into tragedy. An embolic shower from such surgery, often containing cholesterol, can result in forefoot or toe ischemia referred to as "trash foot." The incidence of this early complication is reported as 7-29%, but is believed to be even higher. Prevention and treatment includes heparin, embolectomy, lumbar sympathectomy, aspirin, rheomacrodex and prostaglandins. 3 such patients, 2 men aged 62 and 69, respectively, and a woman of 72, are reported. In 2 of the cases below-knee amputation was required, while the third patient died.
Aged↗
Seatbelt injury to the common iliac artery: report of two cases and review of the literature.
Blunt trauma to the common iliac artery is rather rare. Moreover, seatbelt injuries to the common iliac artery have not yet been reported. This article presents two cases of seatbelt injury involving the common iliac artery. A deceleration-type mechanism is suggested as the primary cause of injury, resulting in the production of an intimal flap. The diagnosis of such an injury is based on clinical suspicion, a change of pulse, or lower limb ischemia. On arteriotomy the damage is greater than seen on external examination. Once diagnosed prompt treatment should follow to prevent loss of life or limb. The signs, symptoms, and modalities of treatment are reported, as well as a review of the literature.
Adult↗
Noninvasive evaluation of vertebrobasilar insufficiency.
The diagnosis of vertebrobasilar insufficiency (VBI) is a clinical challenge because its manifestations are subjective and difficult to quantify. We evaluate 61 patients with the clinical diagnosis of VBI and 30 control patients with other medical problems. We used duplex scanning to study the extracranial carotid, vertebral, and subclavian arteries, and a 2-MHz transcranial Doppler (TCD) to examine the intracranial vertebral and basilar arteries. Extracranial lesions were more common in VBI patients than among controls, including stenosis of the subclavian artery with and without subclavian-vertebral steal and stenosis of the vertebral artery. Intracranial abnormalities identified in the vertebrobasilar circulation included stenosis and occlusion of the intracranial vertebral artery and basilar artery steal. Overall, significant lesions were detected in 32.8% of VBI patients and 3.0% of controls (P less than 0.05). Systolic artery velocity (cm/sec) in the extracranial vertebral artery was higher in controls (65.9 +/- 23.3) than in VBI patients who had no evidence of vertebrobasilar steal (43.0 +/- 17.4, P less than 0.05). Patients with a steal mechanism had an intracranial vertebral artery systolic velocity of 90.0 +/- 38.9, compared with 53.0 +/- 15.0 in controls (2P less than 0.050). Intracranial vertebral artery systolic velocity was higher among VBI patients with significant carotid artery disease (greater than 50%, 76.7 +/- 28.8) than in those with less severe disease (less than 50%, 47.3 +/- 13.8, P less than 0.05). Evaluation and quantitation of the vertebrobasilar circulation using both intra- and extracranial noninvasive studies may afford further insight as to the pathophysiology of vertebrobasilar insufficiency and provide a readily available, direct, and simple method of initial and serial assessment of VBI patients.
Arterial Occlusive Diseases↗
The natural history of amaurosis fugax with minor degrees of internal carotid artery stenosis.
The natural history of amaurosis fugax with hemodynamically insignificant degrees of internal carotid artery stenosis is uncertain. Seventy-three patients over age 40 who presented with amaurosis fugax without obvious cause and had ipsilateral stenoses of 50% or less with carotid duplex scanning were followed for a mean period of 35.5 months (range 3-110) without surgical intervention. At the initial vascular laboratory duplex evaluation, 35 patients had normal arteries (47.9%), 29 had minor (0-19%) stenoses of the ipsilateral internal carotid arteries (39.7%), and 11 had 20-50% stenosis (15.1%). Four patients with 0-19% stenosis and one patient with 20-50% stenosis experienced a subsequent stroke or permanent ipsilateral blindness. When analyzed by life-table format, stroke, blindness, and early death were more frequent in patients with minor degrees of stenosis than in those with normal arteries. Investigations in all patients with amaurosis fugax should be aimed at identifying whether the symptoms are explained by arteriosclerotic, systemic, collagen, cardiac, hematologic, or ophthalmologic disease. When no other etiology is found, and localized carotid bifurcation atherosclerosis of even modest degrees is identified, an atheroembolic etiology should be considered.
Aged↗
Does carotid restenosis predict an increased risk of late symptoms, stroke, or death?
The identification of carotid restenosis as an unexpected late complication of carotid endarterectomy has prompted concerns regarding its importance as a source of new cerebral symptoms, stroke, and death. To investigate these concerns, we analyzed a consecutive series of 507 patients undergoing 566 carotid endarterectomies, each documented as technically satisfactory. Post-operative duplex Doppler examination data at 3 days, 1, 3, 6, 12 months, and annually thereafter in 484 arteries (85.5%) permitted classification of these arteries according to the most severe degree of postoperative stenosis: normal (n = 306); 1% to 19% (n = 89); 20% to 50% (n = 40); more than 50% (n = 49, including 8 occluded). The incidence of more than 50% restenosis was 14.5% in female and 7.7% in male patients (p = 0.003). Life table analyses to 10 years revealed a significantly greater life expectancy among those with restenosis (p = 0.05). Stroke was also less likely in patients with restenosis, although this difference did not reach statistical significance. When survival and stroke were both endpoints, the likelihood of patients with more than 50% restenosis remaining alive and stroke free was also greater than the less than 20% stenotic group (p = 0.03). Thus patients with carotid restenosis were less likely than patients with normal postoperative scans to have late symptoms, stroke, or early death.
Carotid Artery Diseases↗
Subclavian artery occlusion after radiotherapy for carcinoma of the breast.
Disturbance of the arterial circulation in the ipsilateral upper limb following mastectomy is a rare sequel attributed to adjuvant radiotherapy. A review of the literature revealed 20 such cases, and two more are presented. Different mechanisms of injury leading to arterial occlusion have been proposed. This is a late complication with a considerable time lag between irradiation and onset of symptoms. The symptoms vary in type and severity, but are consistent with peripheral occlusive arterial disease. To alleviate symptoms and prevent limb loss, reconstructive vascular surgery is advocated, and was successfully performed in one of our patients.
Aged↗
Monoclonal antibody-induced inhibition of platelet function: effects on hemostasis and vascular graft thrombosis in baboons.
The usefulness of antiplatelet agents in vascular graft recipients remains controversial because of uncertainties regarding drug mechanisms of action and dose-duration effects. In our study, a well-characterized murine monoclonal antibody (LJ-CP8, 10 mg/kg) was infused into baboons to assess the hemostatic consequences and antithrombotic effectiveness of blocking the platelet glycoprotein IIb-IIIa receptor for fibrinogen and other adhesive glycoproteins. Five treated animals and six control animals were evaluated with serial measurements of platelet count, bleeding time, and platelet aggregation ex vivo (in response to adenosine diphosphate and collagen). Indium 111-labeled platelet deposition onto femoral vascular grafts (4 mm inner diameter Gore-Tex) implanted immediately after antibody infusion was measured by quantitative gamma camera imaging. Although the antibody did not alter circulating platelet counts, bleeding times were immediately prolonged to more than 30 minutes (vs. 4.8 +/- 0.4 minutes pretreatment) with only partial normalization by 48 hours (8.3 +/- 1.0 minutes, p less than 0.05). Platelet aggregation in response to both collagen and adenosine diphosphate was abolished immediately and remained impaired for 48 hours. Despite the profound inhibition of platelet function, graft platelet deposition was equivalent postoperatively in both the treated and untreated groups (p greater than 0.5), averaging approximately 5 x 10(9) platelets per graft. Graft-associated indium 111-labeled platelet activity increased over 48 hours and was not reduced by the antibody treatment (p greater than 0.5 at all times). All grafts were removed at 8 days; only one graft from a treated animal was found patent.(ABSTRACT TRUNCATED AT 250 WORDS)
Animals↗
Transcranial Doppler in the management of extracranial cerebrovascular disease: implications in diagnosis and monitoring.
Transcranial Doppler (TCD) insonation permits quantitative noninvasive evaluation of intracerebral arterial velocity. With the use of a 2 MHz Doppler through a transtemporal approach, middle cerebral artery blood velocity (MCA-V, centimeters per second) and major collaterals were measured in 96 patients, including 15 normal control subjects, 66 patients with extracranial cerebrovascular disease (ECCVD), and 15 patients with other medical problems without ECCVD. MCA-V was higher in control subjects (62.7 +/- 15.1) than in patients with ECCVD (45.0 +/- 16.3, p less than 0.05). There was a significant inverse correlation between MCA-V and the degree of internal carotid artery stenosis present by duplex examination. Twenty-three patients monitored during carotid endarterectomy had a mean MCA-V under anesthesia of 37.0 +/- 16.9, which decreased to 22.4 +/- 14.8 during cross-clamping (p less than 0.01). MCA-V during cross-clamping correlated directly with stump pressure (R = 0.87) and was higher when major collaterals were identified before operation by TCD than when none were seen (31.7 +/- 9.5 vs. 8.8 +/- 8.5, p less than 0.01). Shunt function was verified in all 11 patients shunted. Electroencephalographic changes occurred in four patients with an MCA-V of 14.7 +/- 8.5 compared with an average of 24.1 +/- 15.5 for patients with normal electroencephalograms. MCA-V increased from 46.6 +/- 21.2 before operation to 61.0 +/- 22.4 after carotid endarterectomy (p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
Adult↗
The in vivo ageing of red cell enzymes: direct evidence of biphasic decay from polycythaemic rabbits with reticulocytosis.
The rate at which the activities of red cell enzymes decay during maturation of the reticulocyte and ageing of the erythrocyte is poorly understood. It has recently been suggested that loss of enzyme activity may be rapid during reticulocyte maturation and occur slowly thereafter. We have now devised a rabbit model in which reticulocytosis is combined with transfusional polycythaemia. This makes it possible to follow the enzymatic activity of a cohort of reticulocytes without the interfering effect of newly formed cells. In this model the reticulocyte count of the experimental animals falls from about 60% to subnormal levels within 4 d. Red cell hexokinase activity declined rapidly with more than half of the activity being lost within 7 d, little change occurring thereafter. Glucose-6-phosphate dehydrogenase activity declined more gradually, but also followed a biphasic course. The fall of pyrimidine 5' nucleotidase activity was the slowest of the three age-dependent enzymes studied. This is consistent with our observations in children with transient erythroblastopenia of childhood, in which this enzyme, alone of the age-dependent enzymes, was found to be decreased in a senescent red cell population. In contrast to the three age-dependent enzymes studied, the activity of lactate dehydrogenase remained unchanged during the course of the experiment. These studies provide direct verification of the suggestion that the decline of red cell enzyme activities may be biphasic. They show, moreover, that enzyme decay is not only rapid in reticulocytes, but also in young erythrocytes.
5'-Nucleotidase↗
Effect of internal carotid artery occlusion on intracranial hemodynamics. Transcranial Doppler evaluation and clinical correlation.
Neurologic deficits that occur simultaneously with or subsequent to internal carotid artery occlusion may be influenced by the adequacy of the intracerebral collateral circulation. Transcranial Doppler ultrasonography was used to evaluate mean middle cerebral artery blood velocity and blood flow in major collateral arteries in 78 patients, including 39 patients with 40 internal carotid artery occlusions and 39 control patients with less severe extracranial cerebrovascular disease, matched for age and sex distribution. Middle cerebral artery blood velocity was 38.9 +/- 17.9 cm/sec ipsilateral to an occlusion, 50.9 +/- 18.3 cm/sec contralateral to an occlusion (p less than 0.01), and 56.8 +/- 14.4 cm/sec in the controls (p less than 0.01). Pulsatility index ipsilateral to an occlusion (0.86 +/- 0.32) was reduced compared with contralateral and control pulsatility indexes (1.05 +/- 0.33 and 1.03 +/- 0.18) respectively; p less than 0.05). Major intracerebral collateral arteries were detectable in 94.9% of occlusion patients and in 53.8% of controls (p less than 0.01). A posterior communicating artery was demonstrated ipsilateral to an occlusion in 80.0% of the patients and contralateral to an occlusion in 39.5% (p less than 0.01). An ipsilateral posterior communicating artery was identified in all 10 asymptomatic occlusions and in 75.8% of the symptomatic ones. Pulsatility index was 1.02 +/- 0.34 for asymptomatic occlusions and 0.76 +/- 0.30 for symptomatic occlusions (p less than 0.01). Transcranial Doppler ultrasonography permits noninvasive quantification of the cerebral hemodynamic consequences of internal carotid artery occlusion and direct evaluation of the collateral blood supply, which can be correlated with symptomatology.
Aged↗
Vertebral artery compression as an adjunct to transcutaneous Doppler ultrasound examination.
Transcranial Doppler (TCD) evaluation is dependent on the accurate identification of intracranial vessels. Manual extracranial vertebral artery compression was used to modulate blood flow in vessels of the vertebrobasilar system in 118 patients examined by TCD. Two examples of its utility are presented in detail. Complete examination by TCD should include evaluation of the posterior cerebral circulation and its collaterals; vertebral artery compression is a new and important adjunct to the complete evaluation of intracranial vascular anatomy and cerebral collateralization.
Aged↗
[Lobectomy for hepatic malignancy].
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Aged↗
Treatment of liver trauma in the Lebanon War, 1982.
During the Lebanon War, 1982, 37 laparotomies were performed in our ward, mostly for penetrating abdominal trauma. The liver was injured in 11 of these patients and was bleeding at the time of laparotomy in all cases. Liver sutures were restricted to superficial wounds only. In deep lacerations, all devitalized liver tissue was removed by anatomic segmentectomy or lobectomy. Patients who had segmentectomies had a rapid and uneventful recovery, with the exception of one who developed jaundice but later recovered. In one case, the intrahepatic left main branch of the portal vein was repaired. Two soldiers died during surgery. We report our experience in liver surgery during the Lebanon War.
Abdominal Injuries↗
Primary repair of colon injuries.
Colonic injuries are usually treated by exteriorization, resection and colostomy, or primary repair with proximal colostomy. However, many cases of successful treatment of colonic wounds by primary suture without colostomy have been reported. Yet, these repairs are usually restricted to civilian injuries, stab wounds, perforations of the right colon, cases with few or no other organ injuries, a short time interval between injury and operation, absence of shock, and minimal fecal soiling. We considered lack of fecal spillage to be the only important factor for 12 consecutive patients, the majority war casualties, and performed primary colon repairs on them. All the other commonly accepted limiting factors were disregarded. There were no complications related to the bowel repair. Using these more liberal guidelines, the number of primary repairs of colonic injuries may be increased, thus reducing hospitalization time and cost, and more important, reducing morbidity and mortality associated with the creation and subsequent closure of colostomies.
Abdominal Injuries↗