Biomedical subjects

L B Ilkjaer

Publications and source records attributed to L B Ilkjaer.

13 recordsLinked to original sources

PubMed2001

[St Jude's bi-leaflet aortic valve prosthesis throughout two decades. Quality profile and risk factors].

INTRODUCTION: The St Jude standard aortic bi-leaflet disc valve is still the most widespread. With almost 20 years of follow-up, the present material may describe the quality profile of the valve and the relevant risk factors throughout the remainder of most patients' lives. MATERIAL AND METHODS: A 100% complete follow-up was conducted of 694 adult patients who had an aortic valve replacement with the St Jude valve during 1980-1993. The Cox regression analysis was used to identify independent risk factors. RESULTS: Survival was 79%, 58%, 39%, and 37% at 5, 10, 15, and 18 years, respectively. Only 12% of the deaths (0.60%/patient-year) were valve-related with a 15-year freedom of 91%. Embolism (1.18%/patient-year) and anticoagulant-related bleeding (2.24%/patient-year) were the dominant complications with 15-year freedoms of 80% and 72%. Valve thrombosis was noted in two patients (0.04%/patient-year) who were off anticoagulation. Mechanical failure was not observed. Endocarditis (0.42%/patient-year) had a 15-year freedom of 92% compared with 72% and 54%, respectively, for major valve (2.33%/patient-year) and all valve-related complications together (4.33%/patient-year) and 96% for aortic valve reoperation (0.36%/patient-year). Age of the patient and heart-related variables were identified as independent risk factors for mortality and valve-related complications. CONCLUSION: With a follow-up of almost two decades showing a low incidence of valve-related deaths, acceptable thrombogenicity, and absence of mechanical failure, the St Jude bi-leaflet aortic disc valve sets the standard for contemporary mechanical valves.

Adult↗

PubMed2001

[Rupture of the right atrium after blunt trauma].

Cardiac rupture following blunt trauma is usually fatal. Patients arriving alive at the hospital may be saved with prompt diagnosis and treatment. We report a case where a haemopericardium was diagnosed by ultrasonography in a 28-year-old man involved in a motor vehicle accident. A tear in the right atrial appendage was successfully repaired in the operating room at the Emergency Department without the use of a cardiopulmonary bypass.

Accidents, Traffic↗

PubMed2001

Passengers' injuries reflected carriage interior at the railway accident in Mundelstrup, Denmark.

On 1st March 1994, a passenger train with a speed of 85 km/h ran into the rear end of a stopped passenger train north of Aarhus, Denmark. No fatalities occurred. Questionnaires were sent to passengers and crew and 113 of 128 (88%) answered. In the stopped train 32% (9/28) of the sitting passengers compared with 12% (9/76) in the moving train had symptons corresponding to a whiplash lesion. Only the chairs in the moving train had head rests which might explain the observed difference. In the rest section of the moving train with all seats facing the same direction 81% (13/16) of the sitting passengers had face injuries compared to 13% (8/60) in the rest of the train. The higher incidence in the rest section was caused by folding tables at the back of the seats. Serious thoraco-abdominal injuries were only seen in one patient despite the fact that 37 passengers were thrown againsts tables between the seats in the second class section of the moving train. The tables were fragile and usually gave way. In conclusion, carriage interior has a major influence on personal injuries at railway accidents.

Accidents↗

PubMed2000

Standard aortic St. Jude valve at 18 years: performance profile and determinants of outcome.

BACKGROUND: The standard St. Jude disc valve has been in use for 20 years and remains the dominant mechanical valve of today. With nearly 19 years of follow-up, the present large series could indicate the performance profile and its determinants in the very long term. METHODS: A detailed follow-up was performed to a maximum of 18.6 years in 694 patients aged 15 to 83 years who undervent aortic valve replacement (AVR) with the standard St. Jude valve during 1980 to 1993. The Cox regression analysis was used to identify independent determinants of outcome in the aortic stenosis (n = 490) and regurgitation (n = 204) groups. RESULTS: Overall survival was 58%, 39%, and 37% at 10, 15, and 18 years, respectively. Only 12% of deaths (0.60%/ patient-year) were related to the valve with a 15-year freedom of 91%. Embolism (1.18%/patient-year) and anticoagulant-related bleeding (2.24%/patient-year) were the dominant complications with 10-year/15-year freedoms of 90%/80% and 85%/72%, respectively. Only 24% of bleeding events were classified as major. Valve thrombosis occurred in 2 patients (0.04%/patient-year): 1 did not receive vitamin K antagonist treatment and International Normalized Ratio was below target level in the other. There were no mechanical failures. Endocarditis (0.42%/patient-year) and paravalvular leak (0.42%/ patient-year) occurred with 15-year freedoms of 92% and 96%, respectively, with a relation between the latter (but not the former) and preoperative endocarditis in the regurgitation group. Freedom from serious complications (2.33%/patient-year) and all complications joined (4.33%/ patient-year) were 72% and 54%, respectively, at 15 years with a 96% freedom from redo AVR (0.36%/patient-year). Age- and heart-related variables were independent risk factors for mortality, thromboembolism, bleeding, serious complications, and all complications joined. Small valve (19 and 21 mm) adversely affected serious and all complications in the regurgitation group. CONCLUSIONS: With a follow-up approaching 2 decades and exhibiting a low rate of valve-related deaths, acceptable low thrombogenicity, and absence of mechanical failure, the standard aortic St. Jude disc valve sets the standard for contemporary mechanical valves.

Adolescent↗

PubMed2000

A new model for evaluation of thrombosis and ischaemia/reperfusion injury.

BACKGROUND: The purpose of the present study was to describe infarct size and platelet accumulation when reperfusion injury was combined with a thrombogenic lesion in the coronary artery. The left anterior descending artery was damaged in 11 pigs and subsequently occluded proximal to the lesion for 50 min, followed by 4 h of reperfusion. RESULTS: The infarct size/area at risk was 40 (35 63)%. Infarct size correlated with troponin-T-3 h (p=0.85, p<0.002), but not with creatine kinase-3 h. Platelet aggregation decreased by 34% (p<0.01) at 15 min of reperfusion, but returned to baseline. Platelet accumulation in the left ventricle was significantly higher in the area at risk (194 (157-206)%) compared to the right ventricle (137 (120-142)%); p<0.05). CONCLUSION: A decreased platelet reactivity and increased accumulation of platelets in the area at risk indicates that activated platelets become entrapped in the myocardium. Troponin-T was a better marker of myocardial damage than creatine kinase in this in vivo model with pigs.

Animals↗

PubMed2000

Emergency coronary artery bypass surgery after failed percutaneous transluminal coronary angioplasty.

Coronary complications caused by percutaneous transluminal coronary angioplasty (PTCA) may necessitate emergency coronary artery bypass grafting (CABG). In 1994-1998, 132 patients (1.5% of the patients registered in the Danish PTCA registry) underwent CABG within 24 h because of angioplasty complications. We reviewed the files of 86 patients who had emergency operations within 6 h and found that 35% suffered from 1-vessel disease. Fifty-eight percent were taken directly to the operating room from the cardiovascular laboratory, and 13% were given preoperative cardiovascular resuscitation. The vessels most frequently injured were the right coronary artery and the left anterior descending branch (LAD). The patients received a mean of 2.4 coronary bypasses each. Forty-three percent of the patients with lesions of the left main coronary artery and/or the LAD received a vein graft to the LAD. A perioperative Q-wave myocardial infarction developed in 51% of the patients. The in-hospital mortality rate was 12%. These results are inferior to those obtained after elective surgery. Local cardiothoracic backup is vital when PTCA is performed in an unselected patient group.

Adult↗

PubMed1999

Performance profile of the Starr-Edwards aortic cloth covered valve, track valve, and silastic ball valve.

OBJECTIVE: The Starr-Edwards aortic ball valve has passed 30 years of clinical follow-up. A detailed account of the long-term performance from a large series could thus give valuable guidance in managing patients who are still alive, depict the total remaining life-span after aortic valve replacement (AVR) for the average patient, and set a record yet to be matched by modern disc valves. METHODS: A detailed follow-up to a maximum of 31.1 years was performed for 717 patients who underwent their first AVR during 1965-1993 with a Starr-Edwards silastic ball valve (N = 355), a cloth covered valve (N = 164) or a track valve (N = 198) with a total of 7254 patient-years at risk. RESULTS: Patients who received a silastic ball valve were older (average 60 vs. 58 years), had more endocarditis (9%) and more secondary kidney failure (24%) preoperatively than the other patients. The three valve types did not differ as regards long-term survival or freedom from complications and only 15% of late deaths were related to the valve. For the silastic ball valve cumulative freedoms at 10 and 25 years were 59 and 20% from all deaths (crude survival), 85 and 80% from thromboembolism, 87 and 70% from bleeding, 98 and 94% from endocarditis, 96 and 95% from redo AVR and 68 and 51% from all valve related complications joined. There were no instances of structural failure apart from wear of the cloth covering the cage struts of the cloth covered valves. Incidences of haemolysis (0.10%/patient-year) and valve thrombosis (0.06%/patient-year) were low for the silastic ball valve. Analysis of relative survival for the silastic ball valve indicated excess mortality relative to a matched background population only during 1st and 13th postoperative year. Apart from heart related factors and age, independent incremental risk factors for mortality and the various complications included, not valve type, but valve size index (valve size divided by body surface area) < or = 13 mm/m2. CONCLUSIONS: The Starr-Edwards aortic ball valves, not least the currently available silastic ball valve, are durable through the remaining life time of the patients and able to secure near normal age and sex specific survival provided valve and patient size mismatch is avoided.

Adult↗

PubMed1999

Intravenous magnesium reduces infarct size after ischemia/reperfusion injury combined with a thrombogenic lesion in the left anterior descending artery.

Experimental studies have demonstrated that intravenous magnesium (Mg) can protect the ischemic myocardium and has an antithrombotic effect. In patients with myocardial infarction, the reperfusion injury is complicated by the presence of a thrombogenic area in the affected coronary artery that may cause repetitive thrombus formation and embolization. We investigated the effect of Mg on infarct size in a randomized study in pigs. Myocardial infarction was induced by a 50-minute mechanical occlusion of the left anterior descending artery combined with an arterial injury, which stimulated a dynamic thrombus formation with emboli shedding on reperfusion. Magnesium sulfate (6 mmol/20 min plus 3 mmol/h) or saline was started at 30 minutes after coronary occlusion. Real-time ventricular pressure-volume loops were generated from the left ventricle by using a microtip pressure manometer and a conductance catheter. Platelet accumulation in the myocardium was evaluated by using 111In-labeled platelets. After 4 hours of reperfusion, the infarct size/area at risk ratio in the placebo group was 46+/-0.06% (n=8) compared with 22+/-0.07% (n=6) in the Mg-treated animals (P=0. 03). Ejection fraction decreased significantly in the control group but not in the Mg-treated animals (P=0.03). Platelet accumulation in the myocardium did not change significantly between the Mg- and placebo-treated animals (placebo group, 191+/-19%; Mg group, 177+/-29%; NS). The present study demonstrates that intravenous Mg infusion is able to reduce infarct size by >50% and preserve the ejection fraction in this model where ischemia/reperfusion injury was evaluated in the presence of a thrombogenic area in the nutrient artery.

Animals↗

PubMed1998

Outcome of transurethral prostatectomy in men over 80 years.

Two-hundred-and-twenty-nine men aged between 80 and 97 years (mean 83 years) underwent transurethral prostatectomy (TUR-P) for lower urinary tract symptoms (LUTS). All case records were reviewed. The follow-up period was 6-16 years. One-hundred-and-seven patients underwent operation because of acute urinary retention, and 122 because of chronic retention. The mean weight of tissue removed was 20 g (1-200 g). The perioperative mortality (< 1 month) was 2% (5 patients). Postoperative complications occurred in 21% (49 patients). Reoperation was performed in 11% (26 cases). The result was considered satisfactory in 196 patients (86%). The present data demonstrate that transurethral resection of the prostate in men over 80 years has a good outcome with an acceptable urological complication rate and mortality, and we therefore advocate surgery instead of watchful waiting in the fit patient.

Aged↗

PubMed1996

[Esophageal perforations].

An oesophageal perforation is a serious condition with high morbidity and mortality. During the latest decades an increased number of traumatic perforations as well as wide use of endoscopic procedures have increased the incidence of oesophageal perforation. An early diagnosis and treatment is important for the prognosis. Cervical and selected thoracic perforations can be treated conservatively although the majority should be operated. Primary closure can be performed if done before 24 hours have elapsed, while later treatment is controversial. Drainage of the mediastinum and pleural space, as well as diversion of saliva and gastric content is important. The literature is reviewed in relation to etiology, diagnosis, treatment and prognosis.

Esophageal Perforation↗

PubMed1996

[Benign esophageal perforations treated at a department of thoracic surgery].

Between January 1, 1980 and December 31, 1994, 37 patients with benign oesophageal perforation underwent different kinds of treatment. The overall mortality was 30%. When diagnosed less than 12 hours after the perforation the mortality was 21%, between 12 and 24 hours. Reinforced primary repair gave the best results without any deaths in seven cases where it was performed. Oesophageal perforation is a serious condition, and it is important to know the symptoms. If there is any suspicion of the condition, an oesophageal X-ray with watersoluble contrast medium should be performed on liberal indication. When diagnosed the patient should be transferred to a Department of Thoracic Surgery immediately. Only few patients can be treated conservatively and most should be operated with reinforced primary suture and drainage.

Adolescent↗

PubMed1994

[Overlooked bronchial rupture after blunt thoracic injury].

A 72-year-old man developed a total atelectasis of the right lung six weeks after a blunt trauma in a motor vehicle accident. Bronchoscopy demonstrated a total fibrotic occlusion of the right main bronchus. By re-examination of earlier case sheets and chest x-rays it was suspected that the patient had suffered a partiel bronchial rupture from the accident. One and a half centimetres of the bronchus were resected with a good result. Findings and treatment of this rare complication are discussed.

Accidents, Traffic↗

PubMed1994

[Benign esophago-bronchial fistula in a 52-year-old woman].

The case of a 52-year-old woman with an oesophagobronchial fistula is presented. The diagnosis was not made preoperatively. The patient was operated twice, with resection of a diverticulum of the oesophagus at the last operation. The congenital or acquired origin of the fistula is discussed.

Bronchial Fistula↗