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Titolo:
CEREBRAL HEMODYNAMICS DURING INDUCED TACHYCARDIA IN ROUTINE ELECTROPHYSIOLOGIC STUDIES - A TRANSCRANIAL DOPPLER STUDY
Autore:
ZUNKER P; HAASE C; BORGGREFE M; GEORGIADIS D; GEORGIADIS A; RINGELSTEIN EB;
Indirizzi:
UNIV HOSP KIEL,DEPT NEUROL,NIEMANNSWEG 147 D-24105 KIEL GERMANY MUNSTER UNIV HOSP,INST ARTERIOSCLEROSIS RES,DEPT NEUROL D-48129 MUNSTER GERMANY MUNSTER UNIV HOSP,INST ARTERIOSCLEROSIS RES,DEPT CARDIOL & ANGIOL D-48129 MUNSTER GERMANY
Titolo Testata:
Neurological research
fascicolo: 6, volume: 20, anno: 1998,
pagine: 504 - 508
SICI:
0161-6412(1998)20:6<504:CHDITI>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD-FLOW VELOCITY; NEUROCARDIOGENIC SYNCOPE; AUTO-REGULATION; TILT TEST; AUTOREGULATION; HUMANS; DYNAMICS; ARTERY;
Keywords:
TACHYARRHYTHMIA; CEREBRAL BLOOD FLOW; CEREBRAL AUTOREGULATION; SYNCOPE; ULTRASONICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
P. Zunker et al., "CEREBRAL HEMODYNAMICS DURING INDUCED TACHYCARDIA IN ROUTINE ELECTROPHYSIOLOGIC STUDIES - A TRANSCRANIAL DOPPLER STUDY", Neurological research, 20(6), 1998, pp. 504-508

Abstract

Supraventricular and ventricular tachyarrhythmia are established causes of syncope. We investigated the mean blood flow velocities (V-mean)of the middle cerebral arteries (MCA) during routine cardiac electrophysiologic studies in patients with supraventricular and ventricular tachyarrhythmias in order to evaluate the changes in cerebral hemodynamics associated with pre-syncopal and syncopal states. Thirtytwo patients with a history of supraventricular (n = 14) or ventricular (n = 18)tachyarrhythmias were investigated in the nonsedated, post-absorptivestare in supine position. V-mean was assessed in bath MCAs by means of transcranial Doppler under resting conditions, during atrial and ventricular pacing at constant rates (n = 28) and during induction of tachyarrhythmia (n = 4). Mean arterial blood pressure (MABP) and heart rate were also recorded. Seven patients suffered pre-syncope at a heart rate of 187 +/- 45 bpm (mean +/- SD) with an average drop of 44% in the V-mean MCA, and statistically insignificant changes in MABP. Five patients suffered syncope during tachyarrhythmia (mean heart rate 283 +/- 42 bpm) with a reduction of 69% in the V-mean MCA. MABP could be assessed in two of those patients and showed a drop of 75 and 43 mmHg, respectively. During tachyarrhythemia pre-syncope and syncope are associated with an average reduction in V-mean MCA by 44% and 69%, respectively. The decrease in MCA blood flow velocity is a more important predictive factor for the development of pre-syncope and syncope than the MABP.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/21 alle ore 03:11:53