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Biomedical subjects

R Autschbach

Publications and source records attributed to R Autschbach.

At least 91 records · Page 5Linked to original sources
PubMed1996

Assessment of metabolic liver function and hepatic blood flow during cardiopulmonary bypass.

A modified monoethylglycinexylidide (MEGX) test was performed in 14 patients undergoing myocardial revascularization to evaluate liver function during cardiopulmonary bypass (CPB). MEGX is the principal metabolite of lidocaine. Different studies have shown a decrease in MEGX formation in patients with impaired liver function. Following a low-dose bolus application of 0.3 mg/kgBW lidocaine MEGX concentrations were measured in five-minute intervals for half an hour. This was done once before and once during CPB. Arterial and hepatic vein blood samples were obtained in order to avoid the effects of hemodilution by CPB priming. Hepatic blood was calculated using the indocyanine green (ICG) infusion extraction technique. MEGX formation during CPB decreased. After the 10 and 15 minutes measurement points the mean arterio-hepatic venous concentrations were 61 +/- 7.2 micrograms/L and 63 +/- 7.3 micrograms/L respectively in comparison to pre-CPB values of 36 +/- 5.8 micrograms/L and 42 +/- 5.1 micrograms/L. Hepatic blood flow increased insignificantly from a mean of 835 +/- 54 ml/min prior to CPB to 913 +/- 83 ml/min during CPB. As a result the MEGX clearance calculated 15 minutes after administration of lidocaine bolus application did not differ significantly before (51.2 +/- 6.4 micrograms/min) and during CPB (40.2 +/- 5.7 micrograms/min). In conclusion, a decrease in MEGX formation was found during CPB. However, due to increased hepatic blood flow there was no significant change in MEGX clearance before and during CPB.

Adult↗
PubMed1996

Echocardiographic monitoring of minimally invasive mitral valve surgery using an endoaortic clamp.

BACKGROUND AND AIMS OF THE STUDY: Twenty-four patients underwent minimally invasive mitral valve repair (n = 16) or mitral valve replacement (n = 8) using the Port-Access system. Intraoperative transesophageal echocardiography (TEE) was used in these patients to: (i) reassess valve pathology preoperatively; (ii) guide and continuously assess placement and position of the aortic endoclamp; (iii) measure aortic root diameters, aortic distensibility and aortic wall appearance prior to and after aortic endoclamping; (iv) evaluate the de-airing procedure; (v) evaluate the results of mitral valve repair; and (vi) guide weaning from cardiopulmonary bypass (CPB). METHODS AND RESULTS: Placement and positioning of the endoclamp was guided effectively in all but one patient who had acute retrograde aortic dissection with the onset of femoro-femoral bypass. The mean position of the tip of the endoclamp was 2.8 +/- 0.5 cm from the aortic valve annulus. The position was stable in all but five patients in whom repositioning and additional clamp volume were required. There was only a poor relationship between balloon volume and sinotubular junction diameter. The dynamic movement of the aorta was well preserved after clamping and the elasticity module did not change significantly (1.6 +/- 0.71 vs. 1.5 +/- 0.75 dynes x 10(6)/cm2). No intimal tears or wall edema was observed after clamp release. De-airing was incomplete in five patients, two of whom had transient ST-elevations with regional wall motion abnormalities. Weaning of CPB was therefore postponed until the ECG had normalized. All mitral valve repairs but one were successful (equal to or less than grade I residual mitral insufficiency). One patient with persistent grade II mitral insufficiency underwent valve replacement using the same approach. CONCLUSIONS: TEE can effectively guide minimally invasive mitral valve surgery using the Port-Access system. Placement and positioning of the endoclamp and its effects on the aortic wall can be evaluated. De-airing, weaning from CPB and the results of the procedure were effectively monitored using TEE.

Aorta↗
PubMed1996

Stentless bioprostheses for the small aortic root.

BACKGROUND AND AIMS OF THE STUDY: Despite a variety of different artificial heart valves no ideal prosthesis for the small aortic root is yet available. Conventional stented valves are hemodynamically disadvantageous because of higher transvalvular pressure gradients. Stentless bioprostheses were implanted in such patients to evaluate their performance as an alternative to homografts and to conventional mechanical prostheses. MATERIALS AND METHODS: We analyzed 57 patients with small aortic roots who underwent stentless aortic valve replacement (Toronto SPV) from March 1993 to November 1995. All but two patients had aortic stenosis. The mean age at operation was 70.9 (+/-8.2) years. The annular diameter was 18-23 mm (mean 21.4 +/- 1.1 mm) in all patients. Of the 57 patients, 17 received a 23 mm and 40 patients a 25 mm prosthesis. RESULTS: Using the oversizing technique, valve size was adjusted according to the sinotubular junction diameter, allowing a gain in prosthesis size of 2-4 mm to be achieved in all patients. On pre-discharge echocardiography maximum flow velocity was 2.3 +/- 0.4 m/s, maximum pressure gradient was 19.1 +/- 6.8 mmHg, and effective valve orifice area was 1.46 +/- 0.27 cm2. All patients were in NYHA class I or II at discharge. One patient was reoperated due to a folded annulus caused by too much oversizing. At six months follow up there was a significant reduction in pressure gradients and an increase in effective valve orifice areas in relation to a decrease in pre-existing left ventricular hypertrophy. CONCLUSIONS: Stentless bioprostheses show excellent hemodynamics due to their comparably large internal diameter and flexibility. Controlled oversizing is a safe technique without additional complications. As larger valve sizes can be implanted, aortic root enlargement is not necessary. The superior hemodynamic profile of stentless aortic valves is especially advantageous in patients with small aortic roots.

Aged↗
PubMed1995

One-stage surgery of coronary arteries and abdominal aorta in patients with impaired left ventricular function.

BACKGROUND: Coronary artery disease (CAD) is common in patients with abdominal aortic aneurysms (AAA). Some patients will present with the combination of unstable angina, impaired left ventricular function, and a large symptomatic (ie, leaking, expanding) AAA. In this subgroup of high-risk patients, aortic cross-clamping may have a deleterious effect on cardiac function, whereas coronary artery bypass graft surgery before aneurysmectomy (staged operation) carries the risk of perioperative aneurysm rupture. One-stage surgery, ie, myocardial revascularization and simultaneous aortic aneurysm repair, has been proposed in this situation. This article summarizes our results with the combined one-stage approach in patients with symptomatic CAD, impaired left ventricular function, and large symptomatic aortic aneurysms or severe aortic occlusive disease. As yet, this cohort is the largest reported in the English literature. METHODS AND RESULTS: In 25 patients (24 men) with a mean age of 69.4 years (range, 55 to 80 years), we performed combined open heart and intra-abdominal aortic surgery. Eighteen patients had severe three-vessel disease and impaired left ventricular function (ejection fraction, < 35%). In addition, 3 of these patients had severe aortic valvular stenosis and/or insufficiency. Seven patients had one- or two-vessel disease with a low left ventricular ejection fraction in the range of 15% to 30%. All patients were in New York Heart Association functional class III or IV. Twenty-one of 25 patients had symptomatic infrarenal AAA (perianeurysm hematoma was present in 9 patients, and 12 patients had signs of beginning perforation). Four patients with aortoiliac occlusive disease and limb ischemia were simultaneously operated on. The surgical procedure started with the performance of coronary artery bypass graft surgery. After completion of myocardial revascularization, aortic aneurysm repair was performed while extracorporeal circulation was continued for mechanical cardiac assist until aortic surgery was fully accomplished. An average of 3.3 (3 to 5) coronary bypass grafts were placed, including 17 internal thoracic artery grafts. In addition, three aortic valves were replaced. In the abdominal aortic position, 12 straight tube grafts and 13 bifurcation grafts were implanted, and three renal and two carotid arteries were simultaneously repaired. The total time of surgery varied from 2.3 to 8.5 hours, with a mean time of 3.9 +/- 1.4 hours. One intraoperative myocardial infarction occurred despite open grafts. Intensive care unit treatment lasted 1 to 13 days, with a mean of 3.6 +/- 2.5 days. Three patients (12%) died after surgery--1 because of acute renal failure induced by an adverse reaction to heparin, 1 because of myocardial infarction, and 1 because of multiorgan failure. One-year actuarial survival rate was 88%, which compares favorably with survival after isolated AAA surgery in this high-risk patient subgroup and equals survival in patients with severe CAD and severely depressed myocardial function. CONCLUSIONS: One-stage surgery is a possible approach to highly symptomatic patients with severe multivascular disease and has acceptable early morbidity and mortality. Patients with severely impaired left ventricular function and unstable CAD carry a high risk of left heart failure and/or myocardial infarction during abdominal aortic surgery. Extracorporeal circulation protects the heart from the hemodynamic changes after aortic clamping or declamping during abdominal aortic surgery. The present study demonstrates that one-stage procedure is a reasonable option for this patient subgroup.

Aged↗
PubMed1995

Simultaneous coronary bypass and abdominal aortic surgery in patients with severe coronary disease--indication and results.

In patients with severe coronary artery disease (CAD) abdominal aortic surgery is still associated with high morbidity and mortality rates. Some patients will present with both symptomatic CAD and large, symptomatic abdominal aortic aneurysms (AAA) or end-stage aortic occlusive disease (AOD) that does not allow for a two-stage procedure. We report a series of 29 patients who underwent simultaneous coronary artery bypass graft surgery (CABG) and abdominal aortic surgery (25 AAA, 4 AOD). In the AAA group there were 23 males and 2 females with a mean age of 68 years (50-80). Sixteen patients presented with severe three-vessel disease. Ten patients had unstable angina. Aortic stenosis or insufficiency was present in two and one patient, respectively. Four patients with three-vessel disease and an ejection fraction below 30% presented with end-stage AOD and critical limb ischemia. Coronary bypass graft surgery was performed first. With the patient still on partial cardiopulmonary bypass, abdominal aortic surgery was carried out. Patients received an average of 3.1 coronary bypass grafts. Additionally, three aortic valves were implanted. Fourteen tube grafts and 15 bi-iliacal or bifemoral bifurcation grafts were placed in the abdominal aortic position. Additional vascular surgery was performed in five patients. Intraoperative management was without complication in all but one patient, who had intraoperative myocardial infarction (AOD group). Hospital mortality was 8% (2/25) in the AAA group. There was however substantial hospital morbidity (52.2%). The mean follow-up is 20.5 +/- 2.5 months. The actuarial survival rate at 3 years is 84.9%. It is concluded that combined CABG and abdominal aortic surgery is a reasonable option for patients who present with both severe CAD and symptomatic abdominal aortic disease. The continuation of CPB during aortic surgery may effectively prevent the adverse effects of infrarenal aortic clamping on a failing ventricle.

Actuarial Analysis↗
PubMed1995

Open heart surgery in the octogenarians--a study on long-term survival and quality of life.

This retrospective study analyzes the perioperative and long-term survival rate as well as the long-term quality of life of 54 patients (23 f/31 m), aged 80 years or older (80 to 87, mean 82.2, SD +/- 1.79 years), who underwent open heart surgery between January 1986 and December 1993. There were 23 patients with coronary bypass, 21 with aortic valve replacement, 1 with mitral valve replacement, 8 with combined aortic valve replacement and coronary bypass, and 1 with double valve replacement. Preoperatively, 26 of the patients were in New York Heart Association (NYHA) class IV, 28 patients in class III. The in-hospital mortality was 9.3% (5/54) over all and 6.1% (3/49) for elective procedures. Follow-up time ranged from 6 to 91 months (mean 26.2 +/- 16.5). Of 49 discharged patients, 6 (12.2%) died during the follow-up period. At the time of re-evaluation 21 patients were in NYHA class I, 24 patients in class II, and 4 in class III. There was a significant long-term benefit from the surgical intervention in 39 or the 54 patients. Of 43 survivors 41 were able to live on their own and 38 were able to handle their daily routine without help. Two patients were cared for in a nursing home. This long-term analysis demonstrates the benefits of cardiovascular surgery in octogenarians in terms of social integration and quality of life.

Aged↗
PubMed1995

Thermal coronary angiography for intraoperative patency control of arterial and saphenous vein coronary artery bypass grafts: results in 370 patients.

BACKGROUND AND AIM OF THE STUDY: Early graft failure is often associated with technical failures and is therefore potentially avoidable. We used thermal coronary angiography (TCA) for intraoperative graft patency control in 370 patients undergoing routine coronary artery bypass graft surgery to determine whether consequent intraoperative bypass graft control may result in improved patency rates. METHODS: The temperature differences generated in between the myocardium and the grafts by injecting cold cardioplegic solution into the proximal end of a vein graft or by warmer blood running through an internal thoracic artery (ITA) graft were detected using three different infrared camera systems. The resulting "heat pictures" were evaluated for anastomotic patency and to outline graft anatomy. RESULTS: A total of 693 vein grafts were visualized. In 9.4% TCA failed to produce usable images. In the remaining 628 grafts, TCA revealed intraoperative patency in 98.8%. Out of 370 ITA grafts, only 14 could not be sufficiently visualized by TCA. Nineteen ITA occlusions (5.3%) were found: 5 intimal flaps; 11 suture imposed strictures; and 3 proximal ITA occlusions. All occluded grafts were subsequently revised or replaced. All sequential ITA as well as 15 right ITA grafts proved to have patent anastomoses. CONCLUSION: Using TCA an early graft dysfunction rate of 1% for vein grafts and 5.3% for ITA grafts could be demonstrated. Most occlusions were due to technical mistakes at the distal anastomosis. TCA outlines grafts and the attached coronaries by temperature differences without the need for a contrast agent. There is no interference with the surgical procedure. It is an ideal, noninvasive method to immediately document the success or failure of myocardial revascularization.

Adult↗
PubMed1995

The Toronto SPV bioprosthesis: one-year results in 100 patients.

BACKGROUND: We studied the long-term results of heart valve replacement with the Toronto SPV bioprosthesis. METHODS: From March 1993 until July 1994 the Toronto stentless bioprosthesis was implanted in 100 selected patients with a mean age of 70.7 years. The predominant aortic valve lesion was stenosis in 94 and insufficiency in 6 cases. Eighty-eight patients received a valve 25 mm in diameter or larger. Additional coronary artery bypass grafting was performed in 37 cases. Hospital mortality was 4%. Seventy-four patients were seen at 6 months and 38 patients at 1 year follow-up. RESULTS: Structural deterioration, thromboembolism or hemorrhage were not encountered. Nonstructural dysfunction lead to reoperation in 1 patient. Another patient presented with endocarditis at 1 year postoperatively. There were no other valve-related complications. Echocardiographic mean pressure gradients ranged from 7.7 to 11.1 mm Hg postoperatively. There was a significant decrease in pressure gradients at 6 months of follow-up. Minimal aortic valve incompetence was seen in 3 patients. CONCLUSIONS: The Toronto stentless bioprosthesis has superior hemodynamics and is an excellent alternative to conventional stented bioprostheses. Long-term evaluation has to prove whether this promising new valve can live up to its expectations.

Adult↗
PubMed1994

The effect of coronary bypass graft surgery for the prevention of sudden cardiac death: recurrent episodes after ICD implantation and review of literature.

Sudden cardiac death (SCD) accounts for at least 50% of the mortality of patients with ischemic heart failure. Ventricular arrhythmias are responsible for most cases of sudden cardiac death. There is some evidence that coronary artery bypass graft (CABG) surgery may reduce the incidence of recurrent episodes of SCD by prevention of myocardial ischemia. To test the hypothesis that CABG surgery is effective in the prevention of SCD, we compared the recordings of implantable cardioverter defibrillators (ICD) in patients who underwent ICD implantation alone (n = 64) or ICD implantation and concomitant CABG surgery respectively (n = 11). All patients had experienced out of hospital cardiac arrest. ICD recordings were obtained every 3 months and the number of recurrent episodes of ventricular tachycardia (VT) for each time period was noted. Three months following ICD implantation patients in the surgically treated group had an average of one episode of VT per patient as compared to 2.7 episodes in the nonsurgical group. This difference was observed during the following months as well. However, at no time (up to 18 months of follow-up) this difference reached statistical significance. There were no deaths in the surgically treated group. Although we could not demonstrate a statistical significant difference between the two groups, there was a tendency in the surgically treated group to have less episodes of recurrent VT than in the medically treated group. We, therefore, conclude that survivors of SCD presenting with multivessel coronary artery disease (CAD) should undergo coronary artery bypass grafting to prevent myocardial ischemia as the triggering event for lethal ventricular arrhythmias.

Coronary Artery Bypass↗
PubMed1994

Effects of R80122, a new phosphodiesterase inhibitor, on liver and global haemodynamics in patients undergoing coronary artery bypass surgery.

R80122 (0.3 mg/kg body weight), a new phosphodiesterase inhibitor, was tested in ten patients undergoing coronary artery bypass surgery. Haemodynamic measurements were made and hepatic blood flow assessed by the indocyanine green infusion method using liver vein catheterization. Cardiac index increased by 63% and systemic vascular resistance decreased by 47%. Hepatic blood flow and intestinal vascular resistance were not significantly affected; nor was hepatic oxygen consumption. It is concluded that R80122 is a highly cardioselective phosphodiesterase inhibitor and that the reduction in systemic vascular resistance by this drug is not an effect of extensive intestinal vasodilatation.

Adult↗
PubMed1994

Intraoperative assessment of internal mammary artery bypass graft patency by thermal coronary angiography.

Following early graft failure in some patients during routine use of the internal mammary artery in coronary bypass surgery, a thermal coronary angiography technique was used for direct intraoperative control of internal mammary artery graft patency. This non-invasive method allows the evaluation of graft patency, anastomotic integrity and initial flow patterns without compromising the conduct of the surgical procedure. Internal mammary artery graft patency was controlled by thermal coronary angiography in 348 patients undergoing coronary bypass surgery. Graft anatomy, perfusion and distal run-off in the recipient native coronary artery was delineated by thermal coronary angiography using the temperature gradient of the warm perfusing blood and the cold myocardium. Thermal coronary angiograms were evaluated for graft and anastomotic patency as well as for direction and magnitude of internal mammary artery flow in the native coronaries. Some 348 internal mammary artery grafts, including 13 sequential grafts, were evaluated. Thermal coronary angiography failed for technical or logistical reasons in seven of 348 cases (2.0%). Thermal coronary angiography documented optimal anterograde flow in 282 of 341 cases (82.7%), reduced anterograde flow in 38 of 341 (11.1%) and no anterograde flow in 21 of 341 (6.2%). Using this approach 21 internal mammary artery graft occlusions were discovered, 18 at the anastomotic site and three at the site of the previously placed bulldog clamp. In addition, six unexpected distal native coronary stenoses and three internal mammary artery graft spasms were detected by thermal coronary angiography and found to be responsible for impaired anterograde flow. Based on these findings, 16 anastomotic revisions, nine additional vein grafts and two additional vein patches were performed.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1994

Hemodynamic assessment of the stentless Toronto SPV bioprosthesis by echocardiography.

Since March 1993 the Toronto SPVTM bioprosthesis has been implanted in 100 patients. Our prospective study evaluated the echocardiographic valve characteristics and the influence of the echocardiographic assessment on surgical technique. Transesophageal echocardiography (TEE) was applied before and during surgery, and transthoracic echocardiography (TTE) postoperatively. The average valve size implanted was 26.5 mm. Follow up was complete in 74 patients at six months and in 38 patients at one year. Pre-cardiopulmonary bypass (CPB) TEE valve sizing was accurate by +/- 1 mm in 81 patients as compared to mechanical sizing. Post-CPB valve closure was concentric in 99 patients. Minimal aortic incompetence was present in seven patients at one week, in two patients at six months and in one patient at one year. Mean pressure gradients ranged from 7.7 to 11.1 mmHg postoperatively. Overall mortality was 4%. One patient with non-structural dysfunction and another with endocarditis at one year postoperatively were reoperated successfully. At follow up there was a significant decrease in transvalvular pressure gradients and an increase in valve orifice areas. In 32 patients a decrease in left ventricular posterior wall (LVPW) hypertrophy was found (p < 0.001). There was a decrease in tissue depth and recurrence of the dynamic movement of the aortic root. It is concluded that TEE valve sizing is reliable for early valve selection. Valve incompetence is not a clinically relevant issue using the oversizing technique. Improved hemodynamics at follow up can be explained by remodeling of the aortic root and by a decrease in left ventricular hypertrophy. The excellent hemodynamic profile, resembling native aortic valve function, is impressive and has to be confirmed by long term evaluation.

Adult↗
PubMed1993

Fractured strut of Björk-Shiley 70 degrees convexo-concave mitral valve prosthesis found in left coronary artery. Use of a portable transcutaneous cardiopulmonary bypass system for successful valve replacement.

Strut fractures followed by disk escape of Björk-Shiley convexo-concave valve prostheses are a well-known problem. This article discusses the case of a successfully treated patient who was admitted to our institution with extreme and prolonged cardiogenic shock. The strut was dislodged into the main stem of the left coronary artery and the disk into the iuxtarenal abdominal aorta. The intent of this report is, in particular, to illustrate the management problems. Immediately after diagnosis, circulation and oxygenation were ensured by use of a portable cardiopulmonary bypass support (CPS) system whose circulation lines were introduced subcutaneously. Thus the transfer to the operating room and the surgical intervention were able to start under controlled conditions. The disk was removed by Fogarty catheter manoevre without any problems during the same operation, using a transpericardial access to the descending thoracic aorta. In our opinion, the primary insertion of the CPS and the avoidance of an additional laparotomy in disk removal help promote the survival of such critically ill patients.

Cardiopulmonary Bypass↗
PubMed1992

Different ways of application of the implantable cardioverter defibrillator (ICD)--which is the current approach?

The implantable cardioverter defibrillator (ICD) has proved to be effective in patients at risk of sudden cardiac death (SCD). Because of the development of more effective lead- and defibrillator systems the surgical implantation modes have changed from extensive operative interventions (sternotomy, lateral thoracotomy) to less traumatical (subxiphoidal/subcostal approach) and less invasive (transvenous) techniques. Procedures with less operative damage may be offered to patients with reduced cardiac function. However, the kind of operative procedure to be performed must be decided individually. The different system configurations, their advantages and disadvantages as well as their complications are surveyed and discussed in the light of our patient population, 102 cases between 1984 and 1991, and the literature. Even when the "non thoracotomy" implantations will become the favoured method, the standard incisions by thoracotomy will still be of importance. Considering that major complications occur also in transvenous implant procedures and that cardiac operations have to be performed in 20-30% of the patients simultaneously, we suggest--following the recommendations of the North American Society of Pacing and Electrophysiology (NASPE)--that the devices be implanted exclusively in units for cardiac surgery in cooperation with rhythmologically well-trained cardiologists.

Aged↗
PubMed1992

[Effects of R80122. The influence of a new phosphodiesterase inhibitor on global and intestinal hemodynamics in coronary surgery patients].

Phosphodiesterase III inhibitors have been established in recent years in the therapy of congestive heart failure. Many disadvantages, such as extensive vasodilation and the lack of proven positive inotropic properties combined with thrombepenia and elevation of transaminases, have complicated the handling of the drug in clinical practice. Enoximone, an imidazole derivative, has been demonstrated to be more cardioselective and vasodilation has been found to be less pronounced than with amrinone. As a consequence, research was performed to enhance the cardioselectivity of phosphodiesterase III inhibitors by reduction of non-specific cross-reactivity with other phosphodiesterases, and R80122 (Janssen Pharmaceutics, Belgium) was introduced into clinical practice. R80122 ((E)-Ncyclohexal-N-methyl-2[[[phenyl (1,2,3,5-tetrahydro-2 oxoimidazo [2,1b]-quinazolin-7-yl)methylene] amino] oxy] acetamide) is a selective inhibitor of phosphodiesterase (PDE) IIIc, which is localized in the myocardium. Thus, its inhibition leads to a positive inotropic effect, whereas phosphodiesterase IIIRo is found in the vessel wall and causes vasodilation. This study was performed to investigate the hemodynamic profile of R80122 under clinical conditions. Additionally, the intestinal hemodynamics were recorded and changes in intestinal perfusion compared with changes in global hemodynamics. METHODS. The study was thoroughly discussed and approved by the local ethics committee; all patients gave written informed consent. The investigation was performed on ten male patients who were about to undergo elective coronary artery bypass surgery. History, physical examination and laboratory results were within the normal limits and revealed no evidence of liver disease. The usual medication was continued until the day before the operation. Premedication consisted of 2 mg flunitrazepam p.o. in the evening before the operation and 1.5 h before induction of anaesthesia. The determination of hepatic plasma flow was performed by the indocyanine green (ICG) infusion extraction technique using liver vein catheterization. After induction of anaesthesia (MP1), after application of a bolus dose of R80122 (0.3 mg/kg BW) (MP2) and at sternotomy (MP3), hemodynamic data (heart rate, arterial pressure, cardiac output) were recorded and blood samples for the determination of hepatic plasma flow by the concentration of ICG were collected. Anaesthesia was induced with a bolus dose of 0.2 mg/kg BW etomidate, 7 micrograms/kgBW fentanyl and 0.1 mg/kgBW pancuronium and maintained with a continuous infusion of 20 micrograms/min fentanyl, 300 micrograms/min midazolam and mechanical ventilation with O2/N2O at an FiO2 of 0.5. Statistical analysis was performed using the Wilcoxon-Mann-Whitney U test comparing the results after induction of anesthesia (MPI) with those after application of R80122 (MPII) and the results of MPII with those at sternotomy (MPIII). Statistical significance was assumed at P less than 0.05. RESULTS. After the induction of anaesthesia, the median heart rate (HR) was 56/min and did not change after administration of R80122. During sternotomy there was a significant increase in the HR from 64 to 78/min (P less than 0.05). Median arterial blood pressure (MAP) tended to decreased from 91 mm Hg after induction of 77 mm Hg after administration of R80122, although there was no statistical significance because of interindividual differences in the tendencies. At sternotomy, MAP remained unchanged. Cardiac output (CO) increased by 60% after administration of R80122 (P less than 0.01) and did not change during sternotomy. As a consequence of the changes in HR and CO, stroke volume (SV) increased by 22% after administration of R80122 (P less than 0.025) and decreased to control values during sternotomy.

Adult↗
PubMed1990

Transfemoral placement of the left ventricular assist device "Hemopump" during mechanical resuscitation.

The Hemopump is a new left-ventricular assist device (21 F diameter), which provides up to 3.5 L/min output after placement in the left ventricle via the femoral artery. We describe the first case in which the device was inserted during resuscitation. The patient developed untreatable sustained ventricular tachycardias/fibrillation 40 hours after coronary artery bypass grafting. After prolonged mechanical resuscitation (about 3 hours) as a last resort the Hemopump was inserted and rhythm and hemodynamics stabilized. In the following hours a decrease in aortic pressure pulsatility indicated, effective left ventricular support when the Hemopump was running. For short periods the patient had nonpulsatile aortic pressure wave forms, implying complete pump dependence. In this situation cardiac output was about 3.0 L/min, mean aortic pressure reached nearly 50 mmHg using high dosage of catecholamines. The patient remained pump-dependent and died due to untreatable ventricular fibrillation. There was no significant hemolysis during the 20 hours the Hemopump was running. Autopsy revealed no signs of thrombembolism, but intimal lesions of the A. iliaca and of the abdominal aorta with subsequent thrombus formation were demonstrated. In view of the experimentally proven benefit in cardiogenic shock and problems and risks caused by the insertion, future indications for clinical use of this new device are discussed.

Femoral Artery↗
PubMed1986

[Cold struma nodule--an absolute surgical indication?].

From 1969 to 1984 3,972 operations of the thyroid gland were performed. 3,540 scintigraphic findings were evaluated retrospectively. In 2,013 (57%) cases one or more so-called cold thyroid nodules were found. The malignancy rate in these nodules was 5.6%. The fine needle biopsy and cytology gave in 17.9% false-negative results. Based on a malignancy rate of 5.6%, rather high false-negative results of fine needle biopsy and acceptable postoperative complication rate we estimate strict operative indication.

Biopsy, Needle↗