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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Molecular and Cellular Cardiology 26 (1994), S. 1321-1328 
    ISSN: 0022-2828
    Keywords: Adenosine ; Cyanide ; Ischemia ; Noradrenaline ; Noradrenaline uptake ; Rat heart ; α-Adrenoceptor antagonists ; β-Adrenoceptor antagonists
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1803
    Keywords: Key words Angioplasty – catecholamines – epinephrine – norepinephrine – myocardial ischemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study investigated arterial and coronary venous catecholamine concentrations in patients undergoing either elective coronary angioplasty (PTCA) or direct PTCA for acute myocardial infarction. We included 17 patients with stenoses of the left anterior descending coronary artery (LAD) and 10 patients with acute anterior myocardial infarction (AMI) undergoing PTCA. During the initial balloon dilatation arterial and coronary venous plasma concentrations of norepinephrine and epinephrine were determined. In elective PTCA, coronary occlusion (2 min) resulted in a transient increase of arterial concentrations of norepinephrine (2.04 ± 0.30 vs. 1.26 ± 0.13 nmol/L before dilatation) and epinephrine (0.52 ± 0.08 vs. 0.34 ± 0.04 nmol/L) in the first minute of reperfusion, whereas coronary venous concentrations of catecholamines were not changed after dilatation. Among the 10 patients with AMI, immediate reperfusion of the LAD (TIMI grade 3) was achieved in 6 patients. In these patients, baseline arterial concentrations for norepinephrine (3.91 ± 1.16 nmol/L) and epinephrine (4.68 ± 2.07 nmol/L) were elevated and no transcardiac gradient for catecholamines was found. In the first minute after successful reopening of the LAD we detect a distinct rise of the transcardiac norepinephrine gradient from –0.10 ± 0.53 to 85.02 ± 24.64 nmol/L, which declined in the fifth minute of reperfusion to 4.36 ± 2.30 nmol/L. Conversely, venous epinephrine and arterial concentrations for both catecholamines remained unchanged within the observation period. In the four patients with incomplete (TIMI 0–2) reopening of the LAD, we found no cardiac washout of norepinephrine. In summary, a transient rise of systemic catecholamines, but no cardiac release of norepinephrine was observed in patients after brief coronary occlusion. Conversely, a massive washout of norepinephrine from the infarcted myocardium occurred during AMI.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 89 (1994), S. 524-534 
    ISSN: 1435-1803
    Keywords: Anoxia ; cyanide ; exocytosis ; nonexocytotic release ; neuropeptide Y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nicotine-induced noradrenaline was investigated in perfused guinea pig hearts subjected to metabolic blockade that was caused either by anoxia or by cyanide intoxication. Noradrenaline, neuropeptide Y, and dihydroxyphenylethyleneglycol (DOPEG) were determined in the coronary venous overflow. Neuropeptide Y is a sympathetic cotransmitter of nordrenaline, and concomitant release of both transmitters indicates an exocytotic, calcium-dependent release mechanism, whereas neuropeptide Y overflow does not occur during nonexocytotic noradrenaline release. Nonexocytotic, calcium-independent noradrenaline release, however, is associated with an increase of DOPEG overflow, which is the main intraneuronal metabolite of noradrenaline formed by monoamine oxidase if oxygen is present. Anoxia per se caused a nonexocytotic release of noradrenaline starting after 10 min of anoxia and reaching peak levels at 30 min. During anoxia, nicotine (3 and 10 μmol/l) accelerated and enhanced noradrenaline overflow, i.e., the period between the onset of anoxia and the begin of noradrenaline release was shortened and peak levels were increased. Nicotine-induced noradrenaline release was accompanied by neuropeptide Y overflow. The action of nicotine was further evaluated during energy depletion caused by cyanide. As anoxia did, cyanide administration alone resulted in noradrenaline release. In accordance with a nonexocytotic mechanism and due to the presence of oxygen, this release of noradrenaline was accompanied by an increase of DOPEG. When added 10 min after the onset of energy depletion, nicotine (10 μmol/l) caused a brief but marked enhancement of exocytotic noradrenaline release, since this release was calcium-dependent and was accompanied by a significnat rise of neuropeptide Y overflow. In absence of extracellular calcium to avoid exocytosis, concomitant administration of nicotine (3–100 μmol/l) and cyanide caused a concentration- dependent acceleration of both the overflow of noradrenaline and DOPEG, whereas overflow of neuropeptide Y was not increased, thus indicating a nonexocytotic release mechanism. In conclusion, the application of nicotine during myocardial energy depletion increases overflow of noradrenaline by both calcium-dependent exocytotic release and calcium-independent nonexocytotic release mechanisms.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 93 (1998), S. 264-268 
    ISSN: 1435-1803
    Keywords: Key words Adenosine – catecholamines – norepinephrine – rat heart – ventricular tachyarrhythmias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Adenosine is an antiarrhythmic substance particularly effective in catecholamine-dependent tachycardias. Although endogenous adenosine substantially accumulates in catecholamine-stimulated hearts, little is known about the antiarrhythmic potency of endogenous adenosine in this condition. Therefore, we sought to demonstrate a potential antifibrillatory effect of endogenous adenosine either by blockade of adenosine receptors with 8-phenyltheophylline (8-PT) or by suppression of endogenous adenosine release with nitrobenzyl-6-thioinosine (NBTI). The study was performed in spontaneously beating Langendorff-perfused rat hearts. Adenosine release into the effluent was determined by HPLC methods. Catecholamine stimulation was induced by perfusing the hearts with norepinephrine (1 μmol/l) for 30 min, which caused ventricular tachycardia (VT) in 31% and ventricular fibrillation (VF) in 25% of control hearts (n=35). When 8-PT (10 μmol/l) was added to the perfusion buffer prior to norepinephrine, the incidence of VT and VF increased to 79 and 68%, respectively. The addition of 8-PT did not affect the catecholamine-dependent formation of adenosine. Perfusion of the hearts with NBTI (10 μmol/l) prior to norepinephrine reduced adenosine release and increased the occurrence of both VT (65%) and VF (40%). In summary, the results indicate that adenosine is an endogenous antiarrhythmic substance, which accumulates in catecholamine-stimulated myocardium to a level, which effectively suppresses the occurrence of ventricular arrhythmias.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1435-1803
    Keywords: Angioplasty ; catecholamines ; epinephrine ; norepinephrine ; myocardial ischemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study investigated arterial and coronary venous catecholamine concentrations in patients undergoing either elective coronary angioplasty (PTCA) or direct PTCA for acute myocardial infarction. We included 17 patients with stenoses of the left anterior descending coronary artery (LAD) and 10 patients with acute anterior myocardial infarction (AMI) undergoing PTCA. During the initial balloon dilatation arterial and coronary venous plasma concentrations of norepinephrine and epinephrine were determined. In elective PTCA, coronary occlusion (2 min) resulted in a transient increase of arterial concentrations of norepinephrine (2.04±0.30 vs. 1.26±0.13 nmol/L before dilatation) and epinephrine (0.52±0.08 vs. 0.34±0.04 nmol/L) in the first minute of reperfusion, whereas coronary venous concentrations of catecholamines were not changed after dilation. Among the 10 patients with AMI, immediate reperfusion of the LAD (TIMI grade 3) was achieved in 6 patients. In these patients, baseline arterial concentrations for norepinephrine (3.91±1.16 nmol/L) and epinephrine (4.68±2.07 nmol/L) were elevated and no transcardiac gradient for catecholamines was found. In the first minute after successful reopening of the LAD we detected a distinct rise of the transcardiac norepinephrine gradient from −0.10±0.53 to 85.02±24.64 nmol/L, which declined in the fifth minute of reperfusion to 4.36±2.30 nmol/L. Conversely, venous epinephrine and arterial concentrations for both catecholamines remained unchanged within the observation period. In the four patients with incomplete (TIMI 0–2) reopening of the LAD, we found no cardiac washout of norepine phrine. In summary, a transient rise of systemic catecholamines, but no cardiac release of norepinephrine was observed in patients after brief coronary occlusion. Conversely, a massive washout of norepinephrine from the infarcted myocardium occurred during AMI.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 87 (1998), S. s033 
    ISSN: 1435-1285
    Keywords: Schlüsselwörter Herzinsuffizienz – Ischämie – Noradrenalin – Sympathikus ; Key words Heart failure – myocardial ischemia – norepinephrine – sympathetic activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The prognosis in patients with heart failure, independent of etiology, is determined mainly by the extent of sympatho-adrenergic stimulation. In the development of heart failure sympathetic cardiac stimulation precedes systemic sympatho-adrenergic activation. Increased concentrations of the neurotransmitter norepinephrine can be found in the myocardium. This is a result of both increased release from sympathetic nerves as well as reduced neuronal reuptake. We were able to show that in advanced heart failure these effects are distributed heterogeneously in the heart. It has been shown experimentally that the effects on sympathetic neurotransmission are similar for both ischemia and heart failure. Therefore, these findings could indicate an important role of sympatholytic measures in patients with ischemia induced heart failure.
    Notes: Zusammenfassung Die Prognose von Patienten mit Herzinsuffizienz, gleich welcher Genese, wird wesentlich durch das Ausmaß der sympathoadrenergen Aktivierung bestimmt. Bei der Entstehung der Herzinsuffizienz geht die Aktivierung des kardialen Sympathikus einer systemischen sympathoadrenergen Aktivierung voraus. Auf kardialer Ebene findet sich eine erhöhte Konzentration des Neurotransmitters Noradrenalin. Dies beruht zum einen auf einer gesteigerten Freisetzung aus den sympathischen Nervenenden zum anderen auf einer verminderten neuronalen Wiederaufnahme. Wir konnten zeigen, daß diese Störungen in fortgeschrittenen Stadien der Herzinsuffizienz im Herzen heterogen verteilt sind. In experimentellen Untersuchungen läßt sich zeigen, daß kardiale Ischämie gleichsinnige Effekte auf die sympathische Neurotransmission hat wie Herzinsuffizienz. Diese Befunde könnten eine besondere Bedeutung sympathikolytischer Maßnahmen bei Patienten mit ischämiebedingter Herzinsuffizienz begründen.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 28-35 
    ISSN: 1435-1285
    Keywords: Schlüsselwörter Direkte PTCA – rechtsventrikulärer Infarkt – Erfolgsrate – Follow-up ; Key words Primary angioplasty – right ventricular infarction – procedural success – follow-up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Objectives: This study sought to determine the procedural success and the in-hospital outcome after primary coronary angioplasty in patients with acute inferior myocardial infarction and right ventricular involvement (RVI). Background: RVI represents an easily detectable, highly prevalent subset of acute inferior infarction associated with poor outcome even in the era of thrombolysis. Primary PTCA may offer advantages in patients with inferior infarction involving the right ventricle. Methods: Primary coronary angioplasty with optimal stenting was performed in 87 of 88 consecutive patients presenting within 24 hours after onset of acute inferior myocardial infarction. On the basis of right precordial ST segment elevations at admission, patients were classified into those without (n=61) and those with RVI (n=27). The patients were followed prospectively for angiographic success at 10 days and for in-hospital clinical outcome. Results: Baseline characteristics including age, severity of coronary artery disease, proportion of stent implantation, and occurrence of cardiogenic shock were comparable. Patients with RVI had larger infarct sizes (lactate dehydrogenase level: 962 vs 580 U/l, P=0.03), developed more often complete atrioventricular block (18.5 vs. 2%, p=0.0038), needed more often parasymphatholytics (48.1 vs 18.8%, p〈0.001), and had a substantially higher incidence of the Bezold-Jarisch reflex (29.6 vs 6.6%, p〈0.01) following reperfusion. Success of recanalization theraphy acutely and at 10 days, as well as inhospital mortality were similar in patients with and without RVI (88.5 vs. 85.2%, 79.3 vs. 84.7%, 7.4 vs 9.8%). However, patients with RVI revealed a greater lumen gain acutely after PTCA (2.49 vs. 2.13 mm, p=0.025) and experienced less frequently major cardiac events (14.8 vs. 36.1%, p=0.04) which included reinfarction, re-ischemia, coronary bypass grafting, stent thrombosis, and cardiac death. In addition, procedural success was establisched more rapidly (fluoroscopy time: 10 vs 15 min., p=0.032) and with less contrast material (242 vs 295 ml, p=0.015) in patients with RVI. This is probably due to the more proximal location (84.6 vs 6.6%, p〈0.0001) and the larger reference diameter (3.17 vs. 2.79 mm, p=0.03) of the occluded right coronary artery. Conclusions: Primary PTCA is an appropriate reperfusion strategy in patients with RVI. Further comparative studies are required to compare the effectiveness of primary PTCA with early thrombolytic therapy in this high risk setting.
    Notes: Zusammenfassung Hintergrund: Der Nachweis einer rechtsvetrikulären (RV) Beteiligung, die mit hoher Prävalenz beim akuten Hinterwandinfarkt (HWI) auftritt, deutet trotz frühzeitiger thrombolythischer Therapie auf eine ungünstige Prognose hin. Ziel der nachfolgenden Studie war, die Erfolgsrate einer direkten PTCA und die Ereignisrate kardialer Ereignisse während des Krankenhausaufenthalts zu ermitteln. Methode: Eingeschlossen wurden konsekutive Patienten mit einem akuten HWI. Diese Patienten wurden mittels eines um die rechtspräkordialen Ableitungen erweiterten 12-Kanal-EKGs in solche mit (n=27) und solche ohne RV-Beteiligung (n=61) unterteilt. Die angiographische Erfolgsrate wurde akut und vor Entlassung mittels quantitativer Koronaranalyse beurteilt. Des weiteren wurden die Patienten prospektiv auf das Auftreten kardialer Komplikationen während der Hospitalisation untersucht. Ergebnisse: Beide Gruppen unterschieden sich nicht bezüglich ihrer Alters- und Geschlechtsverteilung, des Schweregrads der koronoarer Herzkrankheit oder der Inzidenz eines kardiogenen Schocks. Patienten mit RV-Beteiligung hatten als Hinweis auf einen ausgedehnten HWI signifikant höhere Enzymaktivitäten der Laktatdehydrogenase (962 vs. 580 U/l, p=0,03), wiesen häufiger einen kompletten atrioventrikulären Block (18,5 vs. 2%, p=0,0038) auf, benötigten häufiger Atropin wegen bradykarder Herzrhythmusstörungen (48,1 vs. 14,8% p〈0,001) und erlitten häufiger einen Bezold-Jarisch-Reflex (29,6 vs. 6,6%, p〈0,01). Der frühe und späte Interventionserfolg (vor Entlassung) war vergleichbar bei Patienten mit oder ohne RV-Beteiligung (88,5 vs. 85,2% und 79,3 vs. 84,7%). Die Krankenhaussterblichkeit war ebenfalls in beiden Gruppen vergleichbar (7,4 vs. 9,8%). Patienten mit RV-Beteiligung wiesen signifikant häufiger eine proximale Verschlußlokalisation der rechten Koronararterie (84,6 vs. 6,6%, p〈0,0001) auf und hatten ein größeres Gefäßlumen (Referenzdiameter 3,17 vs. 2,79 mm, p=0,03). Nach Intervention zeigte sich ein größerer akuter Lumengewinn (2,49 vs. 2,13 mm, p=0,025) bei gleichzeitig kürzerer Durchleuchtungszeit (10 vs. 15 min, p=0,032) und geringerer Kontrastmittelmenge (242 vs. 295 ml, p=0,015). Im Verlauf war die kumulative Häufigkeit eines kardialen Ereignisses (Reinfarkt, Reischämie, Stentthrombose, Bypassoperation und kardialer Tod) bei Patienten mit RV-Beteiligung signifikant niedriger (14,8 vs. 36,1%, p=0,04). Schlußfolgerung: Die direkte PTCA weist unabhängig von der Infarktlokalisation – also auch bei Patienten mit RV-Beteiligung – eine gute angiographische Erfolgs- und niedrige klinische Komplikationsrate auf. Kontrollierte Therapiestudien sind nötig, um direkte PTCA und frühe thrombolytische Therapie zu vergleichen.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1435-1285
    Keywords: Key words¶Coronary artery disease –¶left ventricular aneurysm –¶endoaneurysmorrhaphy – follow-up ; Schlüsselwörter¶Koronare Herzerkrankung –¶Ventrikelaneurysma – Follow-up – Therapiekonzept
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die zirkuläre Endoaneurysmorrhaphie (EAR) als chirurgische Therapie von Ventrikelaneurysmen ist mit exzellenten Kurzzeitergebnissen verbunden. Da nur wenig mittelfristige Ergebnisse nach EAR vorliegen, ist die Indikationsstellung für dieses Verfahren nicht endgültig geklärt.¶   Bei 157 Patienten (6/1993–6/1999) mit einem linksventrikulären Ventrikelaneurysma wurde eine EAR durchgeführt. Alle Patienten waren präoperativ symptomatisch mit klinischen Zeichen der Herzinsuffizienz (median NYHA III) oder Angina pectoris Symptomatik bei geringer Belastung. Die Determinaten der Mortalität während des Nachbeobachtungszeitraumes wurden in einer multivariaten Analyse bestimmt.¶   Perioperativ verstarben 5% der Patienten. Die postoperative Sterberate betrug 3,3% pro Jahr, die 5-Jahres Überlebensrate 78%. Die kardiale Beschwerdesymptomatik der Patienten war postoperativ signifikant gegenüber dem präoperativen Zustand verbessert¶(median NYHA II, p〈0,001). Die multivariate Analyse identifizierte eine vorbestehende arterielle Verschlusserkrankung und fortgeschrittenes Alter (〉70 Jahre) als signifikante Determinanten der späten Mortalität. Die Anlage eines Arteria mammaria interna Bypasses war mit einer signifikant verbesserten Langzeitprognose assoziiert.¶   Die Endoaneurysmorrhaphie ist mit einer geringen perioperativen Mortalität, einer signifikanten klinischen Verbesserung und einer guten mittelfristigen Prognose verbunden. Die Endoaneurysmorrhaphie mit begleitender Revaskularisation als therapeutisches Mittel sollte bei symptomatischen Patienten empfohlen werden.
    Notes: Summary Endoaneurysmorrhaphy (EAR) in postinfarct ventricular aneurysms leads to excellent short-term results. However, the temporal response of EAR is widely unknown. Thus, the indication for surgical treatment of patients with ventricular aneurysms is not well defined.¶   EAR was performed in 157 patients (6/1993–6/1999) with symptomatic ventricular aneurysms (median NYHA III). Factors influencing cardiac mortality and morbidity during follow-up were determined by univariate and multivariate analysis.¶   Perioperative mortality was low: 5%. Mortality during follow-up was 3.3% per year, resulting in a 5-year survival rate of 78%. NYHA classification ameliorated significantly from the preoperative status compared to the follow-up period (median NYHA II; p〈0.001). Multivariate analysis identified preexisting arterial occlusive disease and advanced age (〉70 years) as significant factors influencing medium-term mortality. Implantation of the left internal mammary artery was associated with a better survival rate.¶   Endoaneurysmorrhaphy can be performed with low perioperative mortality, will result in a significant amelioration of the cardiac clinical status and offers low medium-term mortality. Our data indicate that EAR seems to be the procedure of choice for patients with symptomatic ventricular aneurysms.
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  • 9
    ISSN: 1435-1420
    Keywords: Key words Coronary artery dissection – traumatic myocardial infarction – PTCA – Stent ; Schlüsselwörter Koronararteriendissektion – traumatischer Myokardinfarkt – PTCA – Stent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine Okklusion der Koronararterien nach stumpfem, nicht penetrierendem Thoraxtrauma ist äußerst selten. Vor Einführung der perkutanen transluminalen Koronarangioplastie (PTCA) und der Möglichkeit der Stentimplantation konnten derartige Koronarverschlüsse nur konservativ oder mit Hilfe einer koronararteriellen Bypassoperation behandelt werden. In dem vorliegenden Fall berichten wir über die Komplikation einer mutmaßlichen Dissektion der rechten Koronararterie nach stumpfen Thoraxtrauma mit myokardialer Infarzierung am vierten posttraumatischen Tag.¶   Ein nach einem Verkehrsunfall mit stumpfem Thoraxtrauma eingelieferter, bis dato gesunder, 36-jähriger Patient zeigte vier Tage nach Aufnahme die Zeichen eines akuten Hinterwandinfarktes mit hämodynamischer Instabilität. In einer daraufhin veranlassten Koronarangiographie zeigte sich ein subtotaler Verschluss der rechten Koronararterie auf dem Boden einer Koronardissektion, die mittels PTCA und Stentimplantation wiedereröffnet werden konnte. Nach weiterhin unkompliziertem Verlauf wurde der Patient in beschwerdefreiem Zustand aus der Klinik entlassen.
    Notes: Summary Coronary artery occlusion followed by myocardial infarction in the setting of nonpenetrating chest trauma is extremely rare. Before the advent of percutaneous transluminal coronary angioplasty (PTCA), the only treatment option for coronary artery occlusion after chest trauma was supportive therapy or coronary artery bypass grafting. We report a case of myocardial infarction after occlusion of the right coronary artery (RCA), presumably due to a dissection of the proximal segment.¶   A previously healthy 36 year old man without risk factors of coronary heart disease was involved in a car accident and subsequently admitted to the emergency ward with a blunt chest trauma. On day four, the ECG showed signs of posterior myocardial infarction. The left ventricular posterior wall was akinetic on echocardiography. Due to these echocardiographic findings and ECG changes, a coronary angiography was performed which showed an angiographically normal left coronary artery. However, the RCA was dissected shortly after its origin. RCA revascularization was achieved by PTCA and stenting of the dissected segment with a good angiographic result. The subsequent clinical course was uneventful.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1435-1285
    Keywords: Schlüsselwörter Koronare Herzerkrankung – Resistenz gegen aktiviertes Protein C – Faktor V Leiden – Antiphospholipid-Syndrom ; Key words Coronary artery disease – activated protein C resistance – factor V Leiden – antiphospholipid syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Increased thrombin generation associated with resistance to activated protein C makes the latter a likely candidate for an increased risk of acute coronary events. Activated protein C resistance (factorV Leiden) on its own, however, appears to have no significant effect in this regard. We describe a case of recurrent myocardial infarction caused by coronary thrombosis in a patient with persistent thrombocytopenia who was found to have a coexistence of heterozygous factor V Leiden and primary antiphospholipid syndrome. Since both thrombophilic disorders interfere with the protein C anticoagulant system, the simultaneous existence of inherited and acquired resistance against activated protein C could account for an increased thrombophilia with manifestation in the coronary arteries. This case suggests that evaluation of patients who present with recurrent acute coronary events should also consider these coagulation defects.
    Notes: Zusammenfassung Eine verminderte Inhibitorwirkung des aktivierten Protein C und die daraus resultierende übermäßige Entstehung von Thrombin könnte zu einem erhöhten Risiko für akute koronare Ereignisse führen. Eine angeborene Resistenz gegen aktiviertes Protein C (Faktor-V-Leiden) allein scheint jedoch keinen Risikofaktor für Myokardinfarkte darzustellen. Wir berichten über einen Patienten mit chronischer Thrombozytopenie und rezidivierenden Myokardinfarkten infolge koronarer Thrombosen, bei dem eine Koexistenz von heterozygotem Faktor V Leiden und primärem Antiphospholipid-Syndrom diagnostiziert wurde. Da beide thrombophilen Erkrankungen mit dem Protein C System interferieren, könnte eine erhöhte Thromboseneigung mit Manifestation in den Koronargefäßen auf das gleichzeitige Vorliegen einer angeborenen und erworbenen Resistenz gegen aktiviertes Protein C zurückzuführen sein. Der Fallbericht weist darauf hin, dass Patienten mit rezidivierenden akuten Koronarereignissen auch hinsichtlich des Vorliegens dieser Gerinnungsstörungen untersucht werden sollten.
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