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Query: UMLS:C0162871 (abdominal aortic aneurysm)
 8,664 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Distal embolization of fragmented laminated thrombus and atheroma producing peripheral ischemia or gangrene is an underemphasized complication of arterial reconstruction. A set of techniques has been developed to minimize this important complication. To assess their effectiveness, the incidence of distal embolism in patients undergoing resection of abdominal aortic aneurysm with and without the use of these techniques was studied. In the 434 patients who underwent elective resection of abdominal aneurysm, measures to prevent distal embolism were used in all cases. The incidence of distal embolism was only 0.23 per cent (1 of 434), in contrast to reported incidences of up to 11 per cent. In the 21 patients who underwent emergency resection of ruptured aneurysm, these techniques were not used due to the need for early proximal control for resuscitation; distal embolism of atheromatous material occurred in 2 cases, an incidence of 9 per cent. The application of these techniques to other peripheral vascular procedures has resulted in similar low rates of postoperative distal ischemia.
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PMID:Prevention of distal embolism during arterial reconstruction. 50 90

Resection of an abdominal aortic aneurysm was associated with intraoperative or postoperative leg ischemia in seven of 100 consecutive survivors of this procedure. Distal embolization of thrombus and debris is the apparent cause in the majority of cases (six). One case of stenosis at a graft-to-vessel anastomosis was identified. Early (intraoperative) thromboembolectomy averted tissue loss in four cases. The role of concurrent lumbar sympathectomy in ameliorating ischemic tissue loss is evaluated. Postaneurysmectomy leg ischemia may accompany other serious complications, particularly hypotension and renal failure.
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PMID:Leg ischemia following surgery for abdominal aortic aneurysm. 68 82

Of 53 patients with horseshoe kidney (9 in the present series), 45 underwent operation for an abdominal aortic aneurysm: 40 electively and 5 on an emergency basis. The remaining eight patients underwent revascularization for arteriosclerosis obliterans. Of the 53 patients, 35 (66%) had renal artery anomalies. The anomalous arteries prevented aortic repair in 6 patients (17%), were left undisturbed in 9 (26%), were revascularized in 7 (20%), and were ligated in 13 (37%). Partial nephrectomy was required in 2 of the 13 patients undergoing arterial ligation. Symphysiotomy was performed in 16 (30%) of the 53 patients. The following approach to management of horseshoe kidney associated with disease of the abdominal aorta is suggested. 1. Whenever a horshoe kidney is suspected, excretory urography, aortography, and, if necessary, selective renal arteriography should be obtained preoperatively. 2. Anomalous renal arteries arising from resected segments of the aorta should be revascularized whenever technically possible, usually by reimplantation of the renal artery into the aortic graft. 3. If an anomalous renal artery is ligated, the kidney should be inspected for signs of ischemia, and partial nephrectomy should be performed if ischemia occurs. 4. Symphysiotomy should be avoided. If division is necessary, symphysiectomy is preferable to symphysiotomy. In either circumstance, care need be taken lest there be fusion of the urinary collecting system and the renal parenchyma. In most patients with horseshoe kidney, aortic surgery has been accomplished without complication and with only minor alteration in surgical technique, even when the renal anomaly is first detected at surgical exploration.
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PMID:Horseshoe kidney associated with surgery of the abdominal aorta. 76

A patient with a relatively localized occult carcinoma of the lung and hemorrhage secondary to chronic disseminated intravascular coagulation (DIC) which continued for eight months is described. Despite continuing DIC two major operations were performed without excessive blood loss. Preoperative heparinization, in vitro clotting of the arterial graft, and temporary postoperative reversal of systemic heparin were utilized for abdominal aortic aneurysm resection. Blood product replacement therapy facilitated an emergency laparotomy. The patient was also managed successfully for several months without anticoagulant therapy. A hypothesis that vascular thrombi are not a necessary prerequisite for DIC is proposed. This hypothesis is based on the absence of thrombi or evidence of ischemia in this patient and in others and is supported by experimental observations made by other investigators.
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PMID:Case report: chronic disseminated intravascular coagulation due to occult carcinoma. 90 Jan 58

Hemodynamic measurements were performed and ECG recorded before and shortly after infrarenal aortic cross-clamping during operation for abdominal aortic aneurysm in five patients without evidence of heart disease (group I) and in ten patients with severe coronary artery disease (group II). All patients sustained an increase in systemic arterial pressure. Group I demonstrated a decrease in pulmonary artery, pulmonary capillary wedge (PCW), and central venous pressures when the aorta was clamped, whereas group II demonstrated an increase. The difference in response of the groups is significant (P less than 0.05). All three patients who responded to cross-clamping with increases of 7 mm Hg or greater in PCW demonstrated myocardial ischemia during cross-clamping. None of the values measured prior to cross-clamping predicted with certainty the response to cross-clamping. Sodium nitroprusside reversed the elevation of left ventricular filling pressure in all three patients, and in two patients, relieved evidence of myocardial ischemia concurrently. In the third patient, ventricular irritability was abolished by lidocaine and did not recur. We conclude that infrarenal aortic cross-clamping may cause myocardial ischemia in patients with severe coronary artery disease. This ischemia may be predicted by a rise in PCW at the time of cross-clamping, and vasodilator therapy is indicated in such patients.
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PMID:Myocardial ischemia due to infrarenal aortic cross-clamping during aortic surgery in patients with severe coronary artery disease. 126 32

The role of surgical therapy for Takayasu arteritis remains controversial. From 1973-1991, 23 patients with Takayasu arteritis have been treated at the University of Southern California. Twelve patients have required 17 arterial reconstructions for symptomatic complications of arterial disease refractory to medical therapy. Indications for operation have included renovascular hypertension (7), extremity ischemia (5), cerebrovascular insufficiency (2), dilated ascended aorta with aortic insufficiency (1), thoracic aortic aneurysm (1), and abdominal aortic aneurysm (1). Long-term clinical follow-up has demonstrated uniform symptomatic improvement. Fifteen of seventeen arterial reconstructions are still patent. Surgical treatment of symptomatic Takayasu arteritis is highly effective. Excellent long-term graft patency can be expected following arterial reconstruction.
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PMID:Surgical treatment of Takayasu arteritis. 136 Sep 62

Spinal cord evoked potentials elicited by direct stimulation of the spinal cord were monitored in 21 patients during thoracic or thoraco-abdominal aortic aneurysm surgery. Flexible catheter-type electrodes were used for both stimulating and recording. The basic pattern of the spinal cord evoked potential consisted of an initial spike and a subsequent polyphasic component. The earliest and most frequent alterations after cross-clamping of the aorta were changes in the configuration or amplitude of the polyphasic component. In 13 patients who exhibited no change except minor alterations of the polyphasic component during the initial test clamping for 15 or 20 min, subsequent graft replacements were safely performed without reimplantation of intercostal vessels. In 2 patients who had sudden cardiac arrests, the evoked potential completely disappeared. The polyphasic component disappeared first, followed by the initial spike. Another patient developed acute loss of the potential after the aneurysm was incised, presumably due to distal aortic hypoperfusion. In this case, prolonged distal hypotension resulted in flaccid paraplegia. Intraoperative monitoring of the spinal cord evoked potential is a useful method for the early detection of spinal cord ischemia during surgery requiring aortic occlusion.
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PMID:Intraoperative spinal cord monitoring during surgery for aortic aneurysm: application of spinal cord evoked potential. 137

Eight patients underwent both cardiac operation and repair of abdominal aortic aneurysm. All had respiratory impairment and significant impairment of left ventricular function, whereas six patients had severe diffuse distal coronary disease. In all patients the cardiac procedure was performed first, and the patients continued to receive cardiopulmonary bypass. Rewarming was not commenced until the abdominal repair was well under way, to protect the vital organs. There were no problems in weaning the patients from bypass, and six of the patients were extubated within 24 hours; one required ventilation for 36 hours. One patient died of colonic infarction complicated by kidney failure without being extubated. Another patient who was initially extubated in 11 hours required reintubation because of poor lung function and eventually died of multisystem organ failure caused by bilateral lower limb ischemia that persisted despite embolectomies. All survivors are well and in New York Heart Association functional class I or II between 3 and 18 months postoperatively. We conclude that for patients considered unfit for abdominal aortic aneurysm operations because of the nature of the cardiac disease, the combined operation with cardiopulmonary bypass is both safe and effective.
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PMID:Combined cardiac and abdominal aortic aneurysm operations. The dual operation on cardiopulmonary bypass. 140 1

Intestinal ischemia following abdominal aortic surgery is a rare but dreaded complication and is associated with a high postoperative morbidity and mortality. Based on a review of the literature the incidence was noted between 2% to 10% of patients undergoing reconstruction of the abdominal aorta. From January 1980 to March 1991, 1017 patients were operated on the abdominal aorta or aorto-iliac bifurcation; the diagnosis was either abdominal aortic aneurysm (AAA) or chronic occlusive disease (COD). There were 819 patients with AAA (80.5%, mean age 67.9 years), and 198 patients with COD (19.5%, mean age 62.2 years). In 134 cases (122 for AAA, 12 for COD) the inferior mesenteric artery (IMA) was reimplantated into the graft. The incidence of postoperative intestinal ischemia after AAA repair was 2.8% (23/819 patients) after AAA repair and 0.5% (1/198 patient) with COD. 66% of the patients who have developed intestinal ischemia were operated emergently. However 2/134 (1.5%) patients presented intestinal ischemia despite reimplantation of IMA. Early explorative laparotomy or early postoperative colonoscopy could demonstrate ischemia in the majority of cases, whereas diagnosis of intestinal ischemia was confirmed at autopsy in 2 patients. In our experience with more than 1000 patients operated on the infrarenal aorta during a 10-year period suggests that a postoperative intestinal ischemia is caused mainly by a misbalance of the blood supply of the left hemicolon and rectosigmoid and may be prevent by reimplantation of IMA. Our actual policy consider reimplantation in presence of patent and large IMA with weak backflow, especially in patients with previous colonic disease or by missing collaterals at preoperative angiogram.
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PMID:[Intestinal ischemia following replacement of the infrarenal aorta and aorto-iliac bifurcation]. 158 73

Colon infarction is a lethal complication of ruptured abdominal aortic aneurysm. We compared multiple anatomic, hemodynamic, and clinical features in 25 patients with ruptured abdominal aortic aneurysm who suffered colon ischemia and 25 initial survivors of ruptured abdominal aortic aneurysm in whom this complication did not develop. Prior impressions notwithstanding, preoperative shock or volume administration did not correlate with the development of colon ischemia, nor did aneurysm location, cross-clamp site, graft type, or inferior mesenteric artery patency. However, patients with colon ischemia had a significantly lower perioperative cardiac output and were significantly more likely to have received alpha-adrenergic vasoconstrictor agents. Seventeen patients (68%) with colon ischemia died compared with nine patients (36%) without colon ischemia. Perioperative maintenance of cardiac output and avoidance of alpha-adrenergic vasopressor agents are critical elements in prevention of this lethal complication.
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PMID:Colon infarction after ruptured abdominal aortic aneurysm. 164 42


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