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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 10 (1969), S. 1057-1060 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 345 (1968), S. 45-60 
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An 100 lamellierten menschlichen Herzen wurden makroskopisch und mikroskopisch die Infarktmuster untersucht. Zum Tode führende Infarkte hatten meist ein kompaktes, größeres Zentrum, überlebte waren in der Regel kleiner und meist netzartig oder fleckförmig. Obturierende Coronarthrombosen bestanden bei 80% der kompakten, tödlichen Infarkte. Die seltenen, ohne morphologisch faßbare Vorboten eingetretenen tödlichen Infarkte waren gewöhnlich groß und die Sklerose in den Kranzarterien außerhalb des Infarktgebietes relativ gering. Ähnliche Befunde ergaben sich bei den Herzen mit Ventrikelruptur. Jede zweite große kompakte Nekrose war von älteren, kleinen Satellitenherden in der Nachbarschaft umgeben, die als Folge einer dem Infarkt vorauseilenden Versorgungsinsuffizienz in der Peripherie gedeutet werden. Umfangreiche Narben inmitten großer kompakter Nekrosen wurden stets vermißt. Multilokuläre Herde bestanden bei mehr als der Hälfte aller großen kompakten Nekrosen, bei den Rupturherzen seltener. Der zum Tode führende Reinfarkt lag meist in einem anderen Versorgungsgebiet als der Erstherd, der oft einen schubweisen Ablauf erkennen ließ. Den relativ seltenen, nicht kompakten tödlichen Infarkten lagen schubweise abgelaufene fleckförmige oder netzartige Prozesse zugrunde. Eine obturierende Thrombose fehlte meist. Beim Herztod ohne große kompakte Nekrosen fand sich beim Vorliegen netzartiger oder fleckförmiger Narben gewöhnlich eine schwere allgemeine Coronarsklerose. Fast immer gingen dem Tode kleine, meist fleckförmige Ausfälle im Myokard um Tage oder Wochen voraus. In dieser Gruppe wurden multilokuläre Herde beim Vorkommen netzartiger Narben immer, bei fleckförmigen Herden meist und bei großen kompakten Narben nur selten beobachtet.
    Notes: Summary One hundred laminated human hearts were studied macroscopically and microscopically for anatomic patterns of myocardial infarction. Fatal infarctions generally showed a larger, compact center; survivors usually demonstrated reticular or spotty infarcts. Occlusive coronary thrombosis was present in 80% of compact, fatal infarcts. Rare, fatal infarcts without anatomically demonstrable precursors were for the most part large, and sclerosis of coronary arteries other than of the vessel feeding the infarct was relatively slight. Similar findings were obtained in hearts with rupture of the ventricle. Every other large, compact region of necrosis was surrounded by older, smaller satellite lesions which were interpreted as residues of peripheral coronary insufficiency that had developed prior to infarction. Sizeable scars within large, compact areas of necrosis were not observed. Multilocular lesions were present in more than 50% of all compact necroses, although they occurred less frequently in ruptured hearts. Fatal re-infarction mostly resulted from occlusion of an artery other than those supplying the area of the primary lesion which frequently had been the result of recurrent attacks. Non-compact, fatal infarcts were rare. They consisted of recurrent spotty or reticular lesions. In most cases coronary occlusion was absent. In coronary death without large, compact necrosis reticular or spotty lesions wereusually, found in the presence of severe, generalized coronary sclerosis. In almost all cases small generally spotty lesions preceded the fatal event by days or weeks. In this group multilocular lesions were always observed with reticular scars, mostly with spotty lesions, and only uncommonly with large, compact scars.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Atrial pacing ; coronary artery disease ; ECG ; hemodynamics ; stress testing ; Angina pectoris ; Coronarinsuffizienz ; Belastungstest ; EKG ; Kreislaufphysiologie ; Vorhofschrittmacher
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Vergleichende hämodynamische Untersuchungen wurden bei 38 Coronarkranken und ebensoviclen Herzgesunden aus einer Gruppe von 143 Untersuchungen mittels kontrollierter Herzfrequenzsteigerung angestellt. Schon bei Ruhe zeigten die Coronarkranken im Durchschnitt eine niedrigere Förderleistung des Herzens bei gleichem oder gar niedrigerem Füllungsdruck des Herzens und vergleichbarem arteriellem und pulmonal-arteriellem Druck. Das hypokinetische Syndrom war außerdem durch einen erhöhten peripheren Gefäßwiderstand gekennzeichnet. Bei der stufenweisen Erhöhung der Herzfrequenz sank der Füllungsdruck des rechten und des linken Herzens, um erst bei höheren Frequenzen wieder anzusteigen. Diese Drucksenkung war bei Coronarkranken weniger ausgeprägt. Während SVI und MSERI sanken, blieben Herzindex und TPR bei allen geprüften Herzfrequenzen unverändert, ebenso die arteriellen und pulmonal-arteriellen Drucke. Die Herzarbeit stieg bei den Coronarkranken etwas an. Die sonst eine Sinustachykardie begleitende Sympathicusaktivierung blieb aus. Infolgedessen wurde die AV-Überleitungszeit zunehmend länger. Dadurch entwickelte sich sehr rasch eine Vorhofpfropfung, in deren Verlauf die Überhöhung dera-Welle besonners bei den Coronarkranken auffiel. — Die Dauer der mechanischen Systole nahm mit steigender Herzfrequenz ab. Bei Coronarkranken war diese Verkürzung weniger ausgeprägt. Das Phänomen der relativ zu langen Systole wird auf eine gestörte Kontraktionsmechanik zurückgeführt. Bei 18 von 38 Patienten wurde ein pectanginöser Anfall durch die „Belastung“ ausgelöst. Die eintretenden hämodynamischen Veränderungen waren denjenigen im ergometrisch induzierten Anfall ähnlich, wahrscheinlich bedingt durch sekundäre Sympathicusaktivierung. Das Verfahren der kontrollierten Herzfrequenzsteigerung erlaubt eine präzise und reproduzierbare Bestimmung der „Angina pectoris-Schwelle“. Die Methode ist sehr schonend und birgt sicher mancherlei noch ungenutzte, diagnostische und therapeutische Vorteile.
    Notes: Summary 38 patients with coronary artery disease and 38 control subjects out of a group of 143 patients examined with the atrial pacing technique underwent a hemodynamic study. Even at rest coronary patients exhibited lower cardiac output, while filling pressures and arterial as well as pulmonary arterial pressures were identical. The hypokinetic syndrome was furthermore characterized by elevated total peripheral resistance in the coronary patients. Atrial pacing initially led to a fall of right and left heart filling pressures. At higher rates this pressure rose definitely above normal in the coronary group, and particularly so if angina pectoris was present, or after sudden cessation of pacing. While cardiac index and TPR remained unchanged within the range of heart rates tested, cardiac work increased slightly in the coronary group. These cases required higher ventricular filling pressures to maintain cardiac output. Progressive prolongation of the PR-interval led to the development of gianta-waves in the right and probably also the left atrial pressure pulse. The height of thea-wave was conspicously exaggerated in the coronary disease group. Left ventricular ejection time shortened progessively with rising heart rate. However, this was not observed in the diseased group. Here, a relative prolongation of the duration of mechanical systole was observed and interpreted as evidence of altered contractile properties of the ischemic myocardium. 18 of 38 patients developed angina pectoris during atrial pacing. Hemodynamic changes in this group resmbled those in exercise-induced angina, the reason being most likely a secondary activation of the sympathetic system. Atrial pacing provides a precise and reproducible means for determination of the angina threshold. The hemodynamic alterations, however, appear to be fundamentally different of those occuring in spontaneous or exercise-induced angina. Diagnostic and therapeutic potentials of the atrial pacing method appear considerable, yet they are largely unexplored.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 54 (1976), S. 323-332 
    ISSN: 1432-1440
    Keywords: Pulmonary gas exchange during exercise ; Myocardial infarction ; Late period of recovery ; Pulmonaler Gaswechsel unter Belastung ; Myokardinfarkt ; Späte Rehabilitationsphase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der späten Rehabilitationsphase nach Myokardinfarkt (13–24 Monate p. infarctum) wurde der pulmonale Gaswechsel neben hämodynamischen Parametern bei 23 Patienten unter Belastung untersucht. Der Belastungsverlauf der gemessenen Parameter gleicht dem Herz- und Lungengesunder. Die arteriellen Blutgaspartialdrucke ( $$Pa_{O2} , Pa_{CO2} $$ ) bleiben gegenüber den Ruhewerten unverändert oder zeigen nur geringe statistisch nicht signifikante Änderungen. Die alveoläre Ventilation $$\dot V_A $$ zeigt im Belastungsverlauf bei allen Patienten keine Unterschiede. Herzzeitvolumen $$\dot Q$$ , Atemminutenvolumen $$\dot V_E $$ , die Toträume, alveolo-arterielle Partialdruckdifferenzen der Atemgase ( $$AaD_{O_2 } , aAD_{CO_2 } $$ ) und Ventilations-Perfusionsverhältnis der Gesamtlunge $$\dot V_A /\dot Q$$ lassen jedoch erkennen, daß entsprechend der unterschiedlichen Arbeitskapazität der Patienten diese Parameter einen differenten Belastungsgang zeigen. Da sich die unterschiedliche Arbeitskapazität nach dem Verhalten von Herzzeitvolumen $$\dot Q$$ und gemischtvenösen Blutgaspartialdrucken aus der verschiedenen kardialen Funktion der Patienten erklären läßt, erscheint die Pathologie des pulmonalen Gaswechsels von der jeweiligen linksventriculären Funktion des Patienten abhängig. 12 der 23 untersuchten Patienten, die nach hämodynamischen Kriterien eine Belastungsinsuffizienz des Herzens zeigten, wiesen die ausgeprägtesten Änderungen des pulmonalen Gaswechsels auf. Die unterschiedliche Arbeitskapazität der Patienten ist allein von der kardialen Funktion begrenzt. Eine Leistungslimitierung durch Störung der Lungenfunktion ließ sich nicht beweisen.
    Notes: Summary After myocardial infarction in the late period of recovery (13–25 months p. infarctum) pulmonary gas exchange in 23 patients was measured besides as hemodynamic parameters during exercise. The parameters take a course similar to that of subjects without lung and heart diseases. Arterial blood gas tensions ( $$Pa_{O_2 } ,Pa_{CO_2 } $$ ) remain unchanged compared to resting values. Alveolar ventilation did show no difference in any of the patients. Minute ventilation $$\dot V_E $$ , the various dead spaces, alveolar-arterial gas differences ( $$AaD_{O_2 } , aAD_{CO_2 } $$ ) and ventilation-perfusion ratios of the whole lung $$\dot V_A /\dot Q$$ suggest however that these parameters show different courses according to the physical capacity of the patients. As the physical capacity of each patient is due to different cardiac functions taken by cardiac output and mixed venous blood gas tensions alterations of pulmonary gas exchange seemed to be dependent on the respective left ventricular function of the heart. Of the twenty-three patients, twelve with cardiac failure under exercise showed the most pronounced alterations in pulmonary gas exchange. Therefore, the different physical work capacity of the patients are determined only by cardiac function. No limitation of the productivity due to impeded lung function could be proved.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 551-557 
    ISSN: 1432-1440
    Keywords: Dobutamine ; Contractility ; Low output cardiac failure ; Low output state ; Dobutamin ; Kontraktilität ; Herzinsuffizienz ; low output Syndrom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die kardiovaskulären Effekte von Dobutamin, einem Derivat des Dopamin, wurden an 7 Patienten mit chronischer Funktionsstörung der linken Kammer bei koronarer und myokardialer Herzerkrankung untersucht. Dobutamin wurde in steigenden Dosen von 2,5–5,0–7,5–10,0 und 15,0 µg/kg/min infundiert. Gemessen wurden der Druck in der zentralen Aorta, im linken Ventrikel (Kathetertipmanometer; LVEDP, LVdp/dtmax) und in der Pulmonalarterie sowie das Herzminutenvolumen (Farbstoffverdünnungsmethode). Der positiv chronotrope Effekt von Dobutamin war gering und erst bei 15,0 µg/kg/min statistisch auffällig. Der systolische Aortendruck nahm im gesamten Dosisbereich mäßig stark zu. Dagegen war die Zunahme des mittleren Aortendruckes mit 11 mm Hg, die des Schlagvolumens mit 22% und der Schlagarbeit mit 49% bei 5,0 µg/kg/min am größten (p〈0,05). Die positiv inotrope Wirkung von Dobutamin führte dosisabhängig zu einer Zunahme des Herzindex und von LVdp/dtmax um maximal 63 bzw. 193% (p〈0,01). Dabei sanken der LVEDP und der periphere Widerstand signifikant ab. Arrhythmien traten unter Dobutamin nicht auf. Nach 15 min war die Wirkung der Substanz abgeklungen. Die Befunde zeigen, daß Dobutamin keine streng kardioselektive Wirkung besitzt. Jedoch überwiegt im Dosisbereich von 2,5–15,0 µg/kg/min die positiv inotrope Wirkung. Weitere klinische Untersuchungen mit dieser Substanz an Patienten mit schwerer Herzinsuffizienz und low output Syndrom erscheinen erfolgversprechend.
    Notes: Summary The cardiovascular effects of dobutamine, a derivative of dopamine have been investigated in seven patients with chronic left ventricular dysfunction. The patients were either suffering from coronary heart disease or from cardiomyopathy. Dobutamine was administered at doses of 2.5–5.0–7.5–10.0 and 15.0 µg/kg/min. The following parameters were measured: aortic pressure, left ventricular pressure (LVEDP, LVdp/dtmax) by using a Millar tip manometer, pulmonary artery pressure and cardiac output (dy-dilution technique). The positive chronotropic effect of dobutamine was small in the lower dosage range and reached significance only with the highest dose of 15.0 µg/kg/min. Systolic aortic pressure was increased moderately over the whole dosage range (p〈0.05). However the increment of mean aortic pressure (+11 mm Hg), of stroke volume (+22%) and of stroke work (+49%) was already maximum (p〈0.05) at a dose of 5.0 µg/kg/min. The positive inotropic action of dobutamine caused a dose related increase of cardiac index and of LVdp/dtmax of +53% and of +193% respectively. This effect was accompanied by a continuous and significant decrease of LVEDP and of peripheral resistance. Dobutamine induced arrhythmias have not been observed. 15 min after infusion stop, no dobutamine effect could be detected. These findings demonstrate that the actions of dobutamine are not merely cardioselective. However, in the dose range between 2.5 and 15.0 µg/kg/min a positive inotropic effect is predominant. Further clinical trials with dobutamine on patients with severe myocardial dysfunction and low output syndrome may yield promising results.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 63 (1985), S. 193-204 
    ISSN: 1432-1440
    Keywords: Suprasternal M-mode echocardiography ; Cardiovascular diseases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The suprasternal approach can be used to image the aortic arch, the right pulmonary artery and the left atrium. Dilatation or dissections involving the aortic arch were detected echocardiographically from the suprasternal notch. The echocardiogram of the right pulmonary artery is altered in cases of acute and chronic pulmonary hypertension. Intrapulmonary thrombi in patients with acute pulmonary embolism were visualized with this technique. A volume overloading of the pulmonary circulation due to a congenital left to right shunt, as well as a decreased pulmonary blood flow due to a congenital right to left shunt causes characteristic changes in the wall motion pattern of the right pulmonary artery. Hypoplasia or aplasia of the central pulmonary arteries can be diagnosed as well. Imaging of the left atrium from the suprasternal notch may help to differentiate between supraventricular and ventricular rhythm disturbances. The suprasternal approach is therefore recommended to be used as a routine part of each echocardiographic examination.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 64 (1986), S. 993-1002 
    ISSN: 1432-1440
    Keywords: Congestive heart failure ; Calcium antagonists ; Hemodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Although beneficial acute hemodynamic effects of calcium antagonists in heart failure have been reported, their use in this setting is still controversial because of the negative inotropic effects produced by these agents. The direct actions of calcium antagonists, that is direct depression of myocardial contractility and coronary and peripheral vasodilatation, are modulated by systemic hypotension-induced baroreceptor activation of autonomic reflexes. Thus, at clinically relevant dosages, the baroreceptor-mediated cardiac stimulatory effects may counterbalance or override the direct negative-inotropic effects, as usually observed with nifedipine or diltiazem. By contrast, with verapamil significant depression of contractility may occur. Newer calcium antagonists with higher vasoselectivity such as nisoldipine or felodipine may be particularly interesting in the setting of congestive heart failure because of pronounced arterial vasodilatation and their additional effects on coronary blood flow, LV-regional wall motion and diastolic function and peripheral blood flow distribution with negligible myocardial effects. Due to their marked vasodilatating properties, newer derivatives may be advantageous in the treatment of heart failure due to coronary artery disease and hypertension. Although limited data concerning long-term efficacy are available, preliminary studies suggest long-term benefit in selected patients. It appears that verapamil should not be used for vasodilator therapy of severe heart failure, since deterioration of LV function may occur.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1440
    Keywords: Immunoglobulin therapy ; Severe infections ; Intensive care patients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A randomized controlled clinical trial was conducted on the effects of immunoglobulin in therapy for infections in 104 intensive care patients. At the first sign of infection, one group of 50 patients received an i.v. preparation of immunoglobulin (4×100 ml) combined with antibiotics. The other 54 control patients received antibiotics alone. The most common infections in these patients were pneumonia, septicemia, peritonitis and wound sepsis. Infections were significantly seldom the cause of death, especially in patients with high-risk surgery who had been treated with immunoglobulin (p≤0.05). Likewise ventilation time in the high-risk surgery group averaged only 5.5 days for those receiving immunoglobulin as opposed to 12.7 days in controls (p≤0.01). Whereas the control group, in particular patients with pneumonia, remained in intensive care an average of 21.5 days, those receiving immunoglobulin stayed only 14.8 days (p≤0.01). In general, patients treated with immunoglobulin recovered more rapidly from infections than did controls (p≤0.01).
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 64 (1986), S. 301-306 
    ISSN: 1432-1440
    Keywords: Myocardial infarction ; Fibrinolysis ; Plasminogen activators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The early treatment of acute myocardial infarction has changed rapidly in recent years. Given the fact that an occlusive coronary thrombus can be found in most infarct patients within 4 h after clinical symptoms, the idea of instituting medical or mechanical recanalization of the occluded vessel is intriguing. However, invasive measures are time consuming, expensive and not freely available to a great number of patients. Thus, only i.v. fibrinolytic therapy of acute myocardial infarction will gain wider application in the near future. Several concepts have been worked out, one of which uses a high-dosage streptokinase or urokinase regimen. A different therapeutic alternative has been made possible by the development of selective fibrinolytic substances, such as the tissue-type plasminogen activator (t-PA) or the anisoylated plasminogen-streptokinase activator complex (APSAC). Preliminary clinical data have shown that the coronary artery patency rate achieved after i.v. administration of t-PA or APSAC is higher than that after conventional treatment with streptokinase or urokinase. The incidence of severe bleeding complications is low and comparable in these studies. However, until myocardial salvage has been demonstrated with early i.v. fibrinolytic therapy in acute myocardial infarction in a placebo-controlled randomized trial, this therapeutic concept will still be unsettled.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 69 (1991), S. 506-510 
    ISSN: 1432-1440
    Keywords: Atrial septal defect (adults, natural course)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Atrial septal defect is the most frequently encountered major congenital cardiac disorder in the adult population, with a prevalence of 0.2 to 0.7 per thousand. Several patients tolerate large unrepaired defects for 80 years or even longer without serious disability. However, it is assumed that, as a rule, atrial septal defect reduces life expectancy, the average age at death not exceeding 50 years. This estimation is based on studies derived mainly from necropsy series or from the admission profile of patients undergoing late operative repair. The onset of atrial fibrillation, with an incidence ranging from 13 to 52 percent among patients older than 40 years, as well as the progression of pulmonary arterial hypertension in up to 53 percent of patients, results in congestive heart failure and functional limitation. On the other hand, very few longitudinal studies thus far have directly and systematically followed the course of adults with unrepaired defects. Thus, many issues regarding the natural history and prognosis of atrial septal defect still remain unresolved. Follow-up series of older patients with nonoperated defects could yield valuable information even in an era when routine early surgical closure is increasingly being recommended.
    Type of Medium: Electronic Resource
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