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1.
The Th2 cell in asthma: initial expectations yet to be realised 总被引:2,自引:0,他引:2
2.
The cold pressor test: Vascular and myocardial response patterns and their stability 总被引:2,自引:0,他引:2
PATRICE G. SAAB MARIA M. LLABRE BARRY E. HURWITZ NEIL SCHNEIDERMAN WILLIAM WOHLGEMUTH LYNN A. DUREL CLIFFORD MASSIE JOACHIM NAGEL 《Psychophysiology》1993,30(4):366-373
The purposes of the present study were to compare the cardiovascular response patterns evoked by three versions of the cold pressor test (either forehead stimulation or hand or foot immersion) and to determine the reproducibility of the responses over a 2-week interval. Blood pressure, heart rate, stroke volume, cardiac output, total peripheral resistance, and systolic time intervals were obtained during rest and during the cold pressor test in 42 young men. Across conditions, the pressor response was supported by peripheral resistance increases with concomitant stroke volume decreases. Although the response panerns were generally similar across sites, exceptions were apparent for heart rate. Forehead stimulation was characterized by no significant change in heart rate, whereas limb (hand or foot) immersion was associated with significant heart rate acceleration. The responses elicited by the three cold pressor test conditions were reliable and showed little evidence of attenuation over the test-retest interval. 相似文献
3.
GUNHILD HERRMANN M.D. STELLA MUÚRLING M.D. BERND WILLE M.D. JOACHIM ZERBST M.D. RÜDIGER SIMON M.D. 《Journal of interventional cardiology》1996,9(1):73-80
The study presented comprises the initial and angiographic long-term results of a consecutive series of recanaliza-tion procedures in a single center. Between 1988 and 1992, a total of 400 patients underwent transluminal recanalization for total coronary occlusions. In 82% of successfully attempted patients, the occlusion could be passed by a standard guidewire. The overall initial success rate was 75% (298 of 400). The highest success rates could be achieved in the left circumflex artery (84%) and left anterior descending coronary artery (77%). Complications were uncomplicated myocardial infarction in ten patients (2.5%) and death in two patients (0.5%). Angiographic follow-up 3–6 months after recanalization could be achieved in 263 (88%) of 298 patients. Significant restenosis (≥ 50% minimum lumen diameter) was found in 57 (22%) of 263, and reocclusion was present in 38 (14%) of 263 patients, resulting in a total recurrence rate of 36%. In conclusion, recanalization can be performed with an initial success rate of 75% using bare-wire technique under the prerequisite operator experience. If a nearly complete angiographic follow-up is performed, the overall recurrence rate is 36%, which seems to be very acceptable in comparison with PTC A results for incomplete obstructions published so far . (J Interven Cardiol 1996;9:73–79) 相似文献
4.
5.
ANDREW BOTTOMLEY phd CHANTAL QUINTEN msc CORNEEL COENS msc FRANCESCA MARTINELLI msc MURIELLE MAUER phd JOHN MARINGWA phd CHARLES S. CLEELAND phd HENNING FLECHTNER phd CAROLYN GOTAY phd EVA GREIMEL phd MADELEINE KING phd DAVID OSOBA md MARTIN J.B. TAPHOORN phd BRYCE B. REEVE phd JOLIE RINGASH phd JOSEPH SCHMUCKER-VON KOCH phd & JOACHIM WEIS phd 《European journal of cancer care》2009,18(2):105-107
6.
JOACHIM B. SIEGMUND JOHN H. WILSON STEPHEN E. LATTNER KIMBERLY GRANNEMAN ROBERT JOHNSON 《Pacing and clinical electrophysiology : PACE》1996,19(1):90-94
This study compares three different pacing system analyzers, which measure impedance at different points during an impulse, with measurements telemetered from implanted pacemakers from four different manufacturers. Measurements were obtained at the time of implantation in a group of 103 patients. The measurements obtained by these different methods differ significantly from each other; the later during the impulse the impedance is measured, the higher in general its value. Interpretation of impedance values should take into account the technique of measurement. 相似文献
7.
Atrial Natriuretic Peptide Levels Reflect Hemodynamic Changes Under Pacemaker Stimulation 总被引:1,自引:0,他引:1
BERND NOLL JOACHIM KRAPPE BURKHARD GÖKE BERNHARD MAISCH 《Pacing and clinical electrophysiology : PACE》1990,13(8):970-975
Pacemaker stimulation influences plasma levels of atrial natriuretic peptide (ANP). This study evaluated in individuals without impaired myocardial function whether a consecutive increase of pacing rates results in reduced alteration of plasma ANP levels mirroring a putative decrease of atrial contribution to cardiac output. In nine resting patients with DDD pacemakers, absolute and relative ANP plasma levels were determined under DDD (175 msec AV delay) and VVI pacing at a pacing rate of 72, 82, 92, and 113 beats/min. When pacing rates were consecutively increased, higher plasma ANP concentrations were measured. However, the differences in relative ANP levels were nearly identical. Therefore, it seems likely that the atrial contribution to cardiac output at high pacing rates is less important than at lower frequencies, at least when the overall myocardial function is not impaired. 相似文献
8.
Extensive Variation in the Signal Amplitude of the Atrial Floating VDD Pacing Electrode 总被引:1,自引:0,他引:1
ZHI-HONG SUN JOACHIM STJERNVALL PETRI LAINE LAURI TOIVGNEN 《Pacing and clinical electrophysiology : PACE》1998,21(9):1760-1765
The dependence of atrial signal amplitude on the site of the ntrial sensing dipole of a single-pass lead was examined in 29 patients. The vertical location of the dipole was documented in supine fluo-roscopy during quiescent and deep breathing and in upright chest roentgenogram, and was expressed as a proportion of the, right atrial height. As the group average, the atrial signal amplitude was equal when tested in supine, sitting, standing, and right- or left-side positions in follow-up determinations. The signal amplitude varied markedly between postures, showing a coefficient of variation of 45%± 24% within the group. Coefficient of variation within the 6-month fallow-up period in each tested position ranged from 31%−4 4%, Correlation between postures was weak (range of r = 0.53–0.81). Vertical location of the atrial dipole had no relationship to the signal amplitude. At least in one posture or test occasion the atrial signal amplitude was very low, ≤ 0.35 mV in 20 patients, and below detection limit (0.25 mV) in 5 patients. Programmed to high sensitivity, atrial undersensing was rare in ambulatory electrocardiography, ranging from 0–9,000 missed atrial beats (0%–8%), with a median of 100 beats/24 hours. In conclusion, temporary variation in atrial signal amplitude is extensive. Despite occasionally measured large signal amplitudes atrial sensitivity in single lead VDD pacemakers should be programmed high, and if poor atrial tracking is suspected, other methods besides routine sensitivity testing should be adapted. 相似文献
9.
Electrical Proarrhythmia: Induction of Inappropriate Atrial Therapies due to Far-Field R Wave Oversensing in a New Dual Chamber Defibrillator 总被引:2,自引:0,他引:2
CHRISTIAN WOLPERT M.D. WERNER JUNG M.D. CHRISTOPH SCHOLL M.D. SUSANNE SPEHL M.D. JOACHIM CYRAN M.D. BERNDT LÜDERITZ M.D. 《Journal of cardiovascular electrophysiology》1998,9(8):859-863
R Wave Far-Field Sensing in Dual Chamber Defibrillators . This case report describes delivery of atrial therapies during a sinus tachycardia in a new dual chamber implantable cardioverter defibrillator inappropriately caused by far-field oversensing of ventricular beats in the atrial channel. Upon classification of the PR interval pattern, the rate criterion for an atrial tachycardia was fulfilled, and the device initiated high-frequency burst pacing as the first stage of programmed tiered atrial therapies. Atrial fibrillation subsequently was induced by high-frequency burst pacing, and eventually a programmed 10-J shock was delivered for successful termination of atrial fibrillation. The phenomenon of far-field oversensing of ventricular beats could be repeatedly observed during exercise testing and abolished by decreasing the atrial sensitivity. 相似文献
10.