[Aortic valve stenosis in the senium: diagnostics and therapeutic strategies].
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Aged↗
Biomedical subjects
G Kleikamp
Publications and source records attributed to G Kleikamp.
Giant coronary arteriovenous fistula. A case report and review of the literature.
Coronary artery fistulas are rare congenital anomalies. Although they constitute the most common form of hemodynamically significant coronary malformation, the incidence is around 0.002% in the general population. We report the successful surgical closure of a very large coronary artery fistula, originating from the left coronary artery and draining into the right atrium with left-to-right shunt of more than 50% and a review of the literature.
Adult↗
[Non-atherosclerotic aneurysm of the left main coronary artery].
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Chest Pain↗
Recovery of organ dysfunction during bridging to heart transplantation in children and adolescents.
The beneficial effects of ventricular assist devices on organ dysfunction during bridging to heart transplantation have been widely reported in the adult population. In contrast, the use of ventricular assist devices used as bridge-to-transplant in children is limited. To evaluate organ recovery during ventricular support in pediatric transplant candidate, respiratory, renal and hepatic function were reviewed retrospectively. The Thoratec device (stroke volume 65 ml) and the HIA-Medos-system (stroke volume 25/10 ml) were used as bridge-to transplant in 11 children and adolescents who were in low-output-syndrome despite maximal pharmacological support. Prior to implantation five patients were mechanically ventilated, six patients underwent cardiopulmonary resuscitation, eight patients had anuria (one treated by hemofiltration), three patients had liver dysfunction and four patients had signs of severe infection. At the time of implantation one patient was supported by the intraaortic balloon pump and one by the femorofemoral bypass for rapid hemodynamic stabilization. Eight patients were treated using the Thoratec device (one of these by Nova cor on the left side), three by the HIA-Medos system. The support time ranged between seven and 140 days. Seven patients could be extubated within three days. Renal function recovered in all pts. Liver enzymes decreased in all pts without reaching normal values. Bilirubin values also decreased in survivors but increased to 9.3 mg/dL in non-survivors. At least seven patients underwent successful heart transplantation, three patients died because of multiorgan failure after extended transfusion and one patient because of technical failure. In our experience the hemodynamic situation was sufficient in all bridging to transplant candidates. In all patients who underwent successful transplantation, transplantability was associated with rapid organ recovery within seven days after initiating mechanical assistance. Extended blood tranfusions, combined failure of three organs and increasing bilirubin values during support seem to be predictors of poor outcome.
Adolescent↗
Clinical use of heparin-coated cardiopulmonary bypass in coronary artery bypass grafting.
Clinical handling, risk and benefit of a heparin-coated cardiopulmonary bypass system combined with reduced systemic heparinization in coronary bypass surgery was investigated in a prospective, randomized clinical study. 243 patients (Pts.) were divided into 3 groups: group A (n = 83) had a standard uncoated extracorporeal circulation (ECC) set, and systemic heparin was administered in an initial dose of 400 IE/kg body weight. During ECC activated clotting time (ACT) was kept > or = 480 sec. Group B (n = 77) had the same ECC set completely coated with low-molecular-weight heparin; i.v. heparin was given in the same dose as in group A, ACT was kept at the same level. Group C (n = 83) had the same coated ECC set as group B, but i.v. heparin was reduced to 150 IE/kg, and was set to be > or = 240 sec during ECC ACT. The same circulatory components were used in all 3 groups including roller pumps, coronary suction and an open cardiotomy reservoir. In the postoperative clinical course, recovery was not significantly different between groups, especially with respect to organ dysfunction; but there was significantly reduced postoperative bleeding where heparin-coated ECC and low-dose systemic heparinization were both used. This circulatory technique was also associated with a distinctly lower need for postoperative blood replacement. We conclude that heparin-coated extracorporeal circulation combined with either full-dose or reduced systemic heparinization can be used effectively with the same standard equipment and procedures as in uncoated technology. Combination with low-dose i.v. heparin leads to significantly decreased blood loss and less need for blood replacement.
Adult↗
[INR self-management after mechanical heart valve replacement: ESCAT (Early Self-Controlled Anticoagulation Trial)].
Severe thromboembolic and hemorrhagic complications following mechanical heart valve replacement essentially occur due to intense oral anticoagulation and fluctuating individual INR values around the target range. INR self-management can help to minimize these fluctuations. Beginning this therapeutic control immediately after mechanical heart valve replacement further reduces anticoagulant-induced complications. Included in the study were 1200 patients. The quality of oral anticoagulation also improved through INR self-management. Over an observation period of two years, nearly 80% of INR values recorded by the patients themselves were within the target therapeutic range of 2.5-4.5. This corresponds to a high significance of p < = 0.001 in favor of INR self-management. Only 64.9% of INR values monitored by family practitioners were within the desired range. The results differed slightly in quality between patient groups with different levels of training (comprehensive, secondary modern, grammar with or without university). Of patients trained in INR self-management following mechanical heart valve replacement, 91.7% maintained their competence in this technique throughout the entire follow-up period. Only 8.3% of those trained immediately after surgery were unable to continue with INR self-management.
Administration, Oral↗
Mitroflow pericardial valve prosthesis in the aortic position: an analysis of long-term outcome and prognostic factors.
BACKGROUND AND AIM OF THE STUDY: Pericardial valves combine optimal hemodynamic properties with limited durability. To describe the long-term performance of Mitroflow pericardial valves in the aortic position, outcome and risk factors up to 12 years after implantation were analyzed. METHODS: A retrospective study, based on follow up of 1,029 patients who received 1,044 Mitroflow pericardial valves in the aortic position between February 1985 and December 1996, was performed. Follow up was 98.2% complete. Average follow up was 3.79 years. Mean patient age was 75.2+/-6.5 years (range: 27.9-90.9 years). At surgery, 86.3% of patients were aged over 70 years. Among patients, 482 (46.8%) had concomitant operations. RESULTS: Results (+/- SE) are given for evident and possible (in parentheses) valve-related events; the latter included all reported postoperative strokes and sudden deaths. Actuarial event-free rates after 5 and 10 years respectively were: structural valve deterioration: 99.2+/-0.5% and 77.6+/-4.4%; non-structural valve deterioration: 99.7+/-0.2% and 99.7+/-1.2%; valve-related complications: 95.7+/-0.9% and 73.5+/-4.0% (5 years 90.1+/-1.2%, 10 years 57.0+/-4.3%); endocarditis: 96.6+/-0.8% and 92.6+/-1.6%; explantation: 98.6+/-0.5% and 80.1+/-3.9%; cerebrovascular accident 95.2+/-0.9% and 82.5+/-3.5%; embolism 99.9+/-0.1% and 99.9+/-0.5%; bleeding 99.8+/-0.2% and 99.8+/-1.3%; overall mortality 69.9+/-1.8% and 35.3+/-3.0%; valve-related death 97.5 +/-1.1% and 95.1+/-4.2% (5 years 91.9+/-1.4%, 10 years 76.1+/-3.2%). The 30-day mortality rate was 4.1%. Patients aged 70 years or more with valve diameters of < or =23 mm showed 10-year freedom rates of 85.8+/-4.6% for structural valve degeneration and 95.1+/-1.2% for evident valve-related death. The detailed risk factor analysis showed results that were in accordance with clinical experience. CONCLUSION: Long-term results with Mitroflow pericardial valves in the aortic position compare well with those for other widely used bioprostheses, especially in patients aged > or =70 years and with small aortic root diameters (< or =23 mm).
Adult↗
Long-term results after myectomy in 64 patients with hypertrophic obstructive cardiomyopathy (HOCM). Morphological and hemodynamic aspects.
BACKGROUND: The aim of this study was to observe the changes in left-ventricular morphology, the improvement in hemodynamics and the survival curves (according to Kaplan-Meier) of patients following transaortic myectomy. METHODS: From November 1985 to August 1997, transaortic myectomy according to Morrow's proposal was carried out at the Heart Center NRW in Bad Oeynhausen in 64 patients with isolated HOCM. At the time of operation, the patient group included 33 women and 31 men aged between 14 and 76 years (mean 52.56 years). A hemodynamically relevant aortic stenosis was excluded in all patients. Sixty-three patients (98.4%) were evaluated in total over a mean observation period of 4.6 years (4 months to 12 years). One patient lost touch with our hospital RESULTS: The clinical symptoms according to NYHA grade could be improved postoperatively from 3.4 +/- 0.33 to 1.36 +/- 0.6 (p < 0.001). The echocardiographic preoperative pressure gradient between the left ventricle and the aorta was 73.2 +/- 14.8 mmHg at rest and 139.6 +/- 21.2 mmHg after provocation by ventricular premature beats (VPBs). Postoperatively, the gradient was reduced significantly: 13.56 +/- 2.7 mmHg at rest and 23.3 +/- 10.7 mmHg after VPBs, respectively (p < 0.001). Perioperative complications occurred in 12 patients including 1 early death due to low-output syndrome, corresponding to an early mortality rate of 1.6%. Four patients died within a postoperative period of 1 year to 9.5 years, none of them due to cardiac causes, 2 due to non-cardiac causes and 1 of unknown causes. In 2 patients a recurrent HOCM occurred at 7 and 10 years after the myectomy and they were treated by catheter intervention with the alcohol induced septal infarction. CONCLUSIONS: Based on the 12-year survival rate of 76.640% in our study, transaortal myectomy according to Morrow represents a safe and reliable form of therapy, with relatively low perioperative mortality and complication rates, also in the long-term
Adolescent↗
Moraxella catarrhalis endocarditis: report of a case and literature review.
A 53-year-old man developed severe acute systemic illness three weeks after an upper respiratory tract infection. Serial blood cultures grew Moraxella catarrhalis. During antibiotic treatment, fever and infectious parameters disappeared, but severe aortic regurgitation developed. Aortic valve replacement was performed, during which extensive destruction of the aortic valve was noted. Endocarditis due to M. catarrhalis is very rare with, to our knowledge, only six cases having been reported to date. M. catarrhalis is a normal commensal of the upper respiratory tract, but in unpredictable circumstances can become an important pathogen. Bacteremia due to this organism therefore requires prompt treatment, as serious organ complications, including endocarditis, can occur.
Aortic Valve Insufficiency↗
Aortic valve surgery following previous coronary artery bypass grafting. Impact of calcification and leaflet movement.
We reviewed the reports of 27 patients who had an aortic valve replacement after previous coronary artery bypass grafting. The aortic valve disease -- mainly aortic stenosis -- showed a rapid rate of progression. In the time interval between coronary artery bypass grafting and aortic valve replacement of 4.6+/-2.2 years the peak-to-peak pressure gradient of the aortic valve rose from 20.2+/-14.3 to 63.0+/-22.7 mmHg. As there is a great interest to identify the patients with a high risk of a rapid progression because of a high mortality of an aortic valve replacement as the second cardiac operation following a coronary artery bypass grafting we also reviewed the cardiac catheterisation films and found a high incidence of calcification and impaired aortic valve motion (81.5% of the patients had already calcified aortic valves and 81.5% had a impaired valve motion) at the time of coronary artery bypass grafting. We concluded that if a patient has to be operated for coronary artery disease an aortic valve replacement should be considered not only according to hemodynamic criteria but also when the aortic valve is calcified or its leaflets' motion is impaired.
Aged↗
[Prevention and management of dysfunction of prosthetic heart valves].
The ideal heart valve prosthesis has not been developed. The today available mechanical and biological prostheses are far from perfect concerning thrombogenesis, mechanical durability and hemodynamic performance. Failure of an implanted valve is possible due to inadequate indication, inadequate surgical technique and inadequate medical follow-up. The patient with a heart valve prosthesis must be seen as a life-long challenge for the cooperation between cardiologists and cardiac surgeons. This article describes the main causes of prosthetic heart valve dysfunction and the surgical treatment, including structural dysfunction, thrombosis, paravalvular leakage, tissue ingrowth and prosthetic valve endocarditis.
Heart Valve Prosthesis Implantation↗
Ischemic cardiomyopathy--revascularization vs. transplantation.
Advanced coronary artery disease (CAD) and ischemic cardiomyopathy with elevated pulmonary artery pressures are criteria of a severe illness. In selected cases surgical revascularization has proved beneficial in terms of survival, reduction of morbidity and lowering the frequency of angina pectoris [6] in numerous studies over the past 25 years. But most of the earlier publications concentrated on patients with angina pectoris (AP) as a dominant symptom. Patients without AP but with predominant signs of congestive heart failure were largely excluded. This has changed recently [1-3,7,8,10,12,16,18] with the advent of the concept of hibernating myocardium. This term is defined as the presence of persistent myocardial and left ventricular dysfunction at rest due to reduced regional coronary blood flow that can be partially or completely restored to normal by myocardial revascularization [5,19]. Salvage of viable myocardium by successful revascularization improves left ventricular dysfunction. Diagnosis of hibernating myocardium is crucial because it does not leave the patient with chronic heart failure a candidate only for cardiac transplantation. Instead, these patients' left ventricular dysfunction is potentially reversible following revascularization by coronary bypass surgery. Furthermore we face a critical shortage of donor organs and extending waiting lists for possible transplant candidates. Following the start of the heart transplantation (HTX) program at our institution more than 690 operations were performed until September 1995. We screened more than 1600 patients for their eligibility as cardiac transplant recipients or for other forms of treatment. In this group of patients it has always been our policy to revascularize rather than transplant whenever possible.
Adult↗
Coronary artery and aortic valve disease as a long-term sequel of mediastinal and thoracic irradiation.
Mediastinal and thoracic irradiation has been identified as a risk factor for the development of among other things, coronary artery disease (CAD) and valvular disease. We screened all patients for a history of mediastinal or thoracic radiotherapy. Between 01.07.1989 and 31.12.1995 we identified 33/16,364 patients with such a history. In 19 cases (0.12%) the cardiac disease was considered radiation-induced, nine patients were female, ten were male. Mean age was 51.7 years (range 38-73). All 19 patients displayed proximal coronary artery stenoses. Mean age in the CAD group was significantly lower (48.5, range 38-63) than in the valvular group (mean age 64.0, range 55-73). The mean interval since radiotherapy in the valvular group was significantly longer (22.25 years, range 13-32) than the one in the CAD group (12.2 years, range 7-24). All patients were treated surgically and made an uneventful recovery. Some form of mediastinal fibrosis or pericardial adhesions was present in all patients. We conclude from these findings that radiation-induced cardiac disease is infrequently encountered in patients from a large surgical center. However, especially the radiation-induced coronary artery disease displays a specific pattern of stenosis location.
Adult↗
Long-term mechanical circulatory support.
Against the background of an increasing number of patients waiting for heart transplantation but a stagnating number of transplant procedures, long-term mechanical circulatory support is gaining major importance. We investigated the outcome of 20 patients (15 men, and 5 women, aged between 15 and 66 years) each supported for more than 100 days between September 1987 and August 1996. The indications for implantation were bridging in 17 patients, myocarditis in 2 patients, and postcardiotomy cardiogenic shock in one patient. 12 patients received the Novacor IVAD, 4 patients the Thoratec system, 3 patients the HeartMate device and one patient both Novacor and Thoratec. Mean duration of support was 178.1 days, 15 patients were transplanted, 14 of them could be discharged, 2 patients died, 4 patients are still waiting. The most frequent complication was device-related infection in 11 patients. The results have shown that all three systems are safe and reliable devices for supporting patients for more than 100 days.
Adolescent↗
[What treatment expectations does the elderly patient have from surgery and what can surgery achieve--from the viewpoint of heart surgery].
In the west the elderly population is constantly increasing. Consequently, the percentage of old and very old patients is also increasing among cardiac surgical cases. Almost all cardiac diseases which can be treated surgically can be corrected nowadays with good results even in very old patients. Prerequisites are the correct judgement of individual risk and possible individual gain for the patient. This has to be weighted against the surgeon's and the institution's results. Today, no patient requiring a cardiac operation should be refused on the grounds of age.
Aged↗
[Non-Hodgkin's lymphoma with heart, mediastinum and lung hilar involvement].
We performed an exploratory thoraco-, pericardio- and cardiotomy in a 70-year-old male patient suffering from a biatrial tumor after a thorough diagnostic procedure had failed to reveal the correct diagnosis. Histologically, the tumor proved to be a centrocytic-centroblastic non-Hodgkin-lymphoma. This case demonstrates the diagnostic difficulties in cardiac involvement of lymphomas and presents the therapeutic options.
Aged↗
Stentless xenograft valve in a truncus arteriosus communis.
We report the use of a recently developed stentless porcine valve in a 2-year-old child with truncus arteriosus communis (type I). The child had received no previous surgical palliation. Despite a markedly increased pulmonary arteriolar resistance the right ventricle was connected to the pulmonary artery with a homograft. The postoperative course was complicated at first by right ventricular failure due to pulmonary hypertension and secondarily by left ventricular failure caused by rapidly increasing truncal valve incompetence. Because we did not have a suitable homograft at hand we replaced the truncal valve with a stentless porcine xenograft valve.
Bioprosthesis↗
Tricuspid valve regurgitation following blunt thoracic trauma.
Valvular lesions following blunt thoracic trauma are uncommon. Tricuspid valve regurgitation occurs very rarely. We report a successful tricuspid valve reconstruction for rupture of the chordae tendineae in a young man nine years after a motor vehicle accident. The value of echocardiography and transesophageal echocardiography for the diagnosis and quantification of this valve lesion is stressed.
Accidents, Traffic↗