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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Italian journal of neurological sciences 20 (1999), S. 155-159 
    ISSN: 1126-5442
    Schlagwort(e): Key wordsMicroemboli ; Transcranial Doppler ; Mechanical heart valves ; Stroke ; Carotid stenosis ; Gaseous bubbles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Transcranial Doppler detection of microembolic signals has been described in several clinical conditions such as carotid stenosis, prosthetic heart valves, acute stroke, and carotid surgery. The importance of these events for clinical decision-making is still a matter of debate. The authors review the literature and report their personal experience on the clinical significance of microemboli detection.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1590-3478
    Schlagwort(e): Microemboli ; Transcranial Doppler ; Mechanical heart valves ; Coagulation ; Echocardiography ; Gaseous bubbles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Sommario I soggetti con valvole cardiache artificiali manifestano frequenti segnali microembolici (MES) al Doppler transcranico: scopo dello studio è di valutare tali fenomeni in soggetti con valvole mono-disco e bi-disco. Abbiamo esaminato con monitoraggio bilaterale transcranico 42 pazienti, di cui 15 portatori di valvole mono-disco e 27 di valvole bi-disco. Per ogni soggetto sono stati registrati i parametri coagulativi ed ecocardiografici, ed e stato effettuato esame eco-Doppler dei vasi sopraaortici. Diciotto pazienti su 42 (43%) hanno manifestato MES, di cui 61 % bilaterali, 17% a sinistra e 22% a destra. Non è stata evidenziata alcuna correlazione significativa tra presenza di MES ed èta del paziente, presenza di fibrillazione atriale, valori di (international normalized ratio), dimensioni delle camere cardiache al-l'ecocardiogramma, sede delta valvola. Un solo paziente su 15 (7%) con valvole mono-disco presentava MES, mentre 17 su 27 (63%) con valvole bi-disco presentava tale fenomeno (p=0.0003). I pazienti con valvole bi-disco e MES avevano valvole di impianto più remoto e, solo per le valvole a sede aortica, dimensioni valvolari maggiori.
    Notizen: Abstract Microembolic signals (MES) have been described in patients with different types of prosthetic valves. The aim of our study was to compare prevalence of MES in patients with mono-leaflet and bi-leaflet valves, and to correlate them with different clinical and echocardiographic parameters. We evaluated 42 patients, 15 with mono-leaflet and 27 with bi-leaflet valves, with 30-minute bilateral simultaneous transcranial Doppler monitoring for the identification of MES. All patients performed blood testing for international normalized ratio (INR), color-coded duplex of supra-aortic vessels, and echocardiography. Eighteen patients (43%) showed MES; 61% of MES were detected bilaterally, 17% only on the left and 22% only on the right middle cerebral artery (MCA), with no interhemispheric difference. MES did not correlate with patient's age, echocardiographic parameters, INR, presence of atrial fibrillation, or site of valve replacement. One (7%) of the 15 patients with mono-leaflet valves had MES, as opposed to 17 (63%) of the 27 with bi-leaflet valves (p=0.0003). Patients with bileaflet valves and MES had valves of older implantation and, only for aortic valves, larger valve size.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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