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  • Articles  (241)
  • 1995-1999  (131)
  • 1985-1989  (69)
  • 1960-1964  (41)
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  • 1
    Electronic Resource
    Electronic Resource
    Primary aldosteronism by carcinoma of the adrenal cortex (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 428-432 
    Details
    ISSN: 1432-1440
    Keywords: Rare cause of primary aldosteronism ; Hypokalemic hypertension ; Diagnostic procedure ; Treatment of malignant adrenal disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A 58-year-old white woman with hypertension and severe hypokalemia was found to have a carcinoma of the left adrenal gland. Plasma renin activity was constantly under the normal limit, while plasma aldosterone levels were pathologically elevated. Plasma cortisol (8:00 a.m.) and excretion rates of urinary free cortisol were within the normal range. After an adrenalectomy, relapsing excessive aldosterone secretion was successfully treated with opDDD (Lysodrene). Ten months after the diagnosis was established, the patient died from a bleeding liver metastasis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01715766
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  • 2
    Electronic Resource
    Electronic Resource
    Minoxidil and captopril in severe hypertension (1986)
    Springer
    Journal of molecular medicine 64 (1986), S. 327-332 
    Details
    ISSN: 1432-1440
    Keywords: Severe hypertension ; Minoxidil ; Captopril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The antihypertensive efficacy of minoxidil and captopril was compared in 23 males with essential or renal parenchymatous hypertension refractory to conventional antihypertensive drug therapy. Following a pretreatment period the patients were randomly assigned to receive either minoxidil, 2.5 mg twice daily (n=12), or captopril, 25 mg twice daily (n=11). In patients with diastolic blood pressure 〉95 mmHg, doses of minoxidil and captopril were increased in 2-week intervals. Patients who maintained diastolic pressure 〉95 mmHg and/or those with intolerable side effects were switched over to the alternative substance. After a mean observation period of 12 weeks a significant decrease in systolic and diastolic blood pressure was observed (179/114 vs 148/92 mmHg in the minoxidil group; 176/111 vs 158/97 mmHg in the captopril group). The primary response rate was 75% in patients treated with minoxidil and 55% in those with captopril (not significant). After the change to the alternative substance two of the four non-responders on captopril and one of the two non-responders on minoxidil became responders. Side effects occurred significantly more often during minoxidil than captopril (p〈0.05). The high efficacy of minoxidil and captopril in the treatment of severe hypertension refractory to conventional drugs was confirmed. Minoxidil lowered blood pressure slightly more than captopril, but it had a higher incidence of side effects than captopril.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01711952
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  • 3
    Electronic Resource
    Electronic Resource
    Captopril before and after spironolactone therapy in primary aldosteronism (1985)
    Springer
    Journal of molecular medicine 63 (1985), S. 361-363 
    Details
    ISSN: 1432-1440
    Keywords: Primary aldosteronism ; Captopril ; Spironolactone ; Renin-angiotensin ; Converting-enzyme ; Secondary hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In three patients with primary aldosteronism, the acute effect of a single dose of captopril on the elevated mean arterial blood pressure (MAP) was studied before and after 4 weeks of treatment with spironolactone. Before spironolactone therapy, captopril did not cause any drop in MAP. Four weeks later, after an oral daily dose of 400 mg spironolactone, MAP was still elevated in all three patients, though electrolyte abnormalities were fully corrected. Since plasma renin activity (PRA) was increased to values above the normal range, the acute effect of captopril on MAP was tested again. A single dose of 25 mg captopril then caused a fall in MAP to normal. These data reveal the conversion from a renin-independent to a renindependent kind of hypertension after spironolactone therapy in three patients with primary aldosteronism syndrome. This might be of pathogenetic and therapeutic interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01731655
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  • 4
    Electronic Resource
    Electronic Resource
    Atenolol versus pindolol: Side-effects in hypertension (1985)
    Springer
    European journal of clinical pharmacology 28 (1985), S. 89-91 
    Details
    ISSN: 1432-1041
    Keywords: atenolol ; pindolol ; sleep disturbance ; β-blockers ; dreaming ; fatigue ; hypertension ; lipophilicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary This randomized crossover out-patient study was designed to compare the antihypertensive effects of atenolol and pindolol. After a wash-out period of two weeks in pretreated cases, 107 patients with essential hypertension were given either atenolol 100 mg once-daily or pindolol 20 mg slow release (SR) once-daily. Both atenolol and pindolol lowered blood pressure over the 24 week period. The diastolic blood pressure reduction was significantly greater (p〈0.01) with atenolol than with pindolol. Before β-blocker therapy, many patients had already experienced side-effects such as fatigue, sleep disturbances and dreams. This probably relates to the high sensitivity of the analogue scale used to assess side-effects, and to the high incidence of such symptoms in untreated patients. As the study progressed there was a reduction in the frequency of fatigue (p〈0.03) and dreams (p〈0.05) in both groups, whereas sleep disturbances significantly increased under pindolol (p〈0.05) but decreased under atenolol (p〈0.05). The only important side-effect difference between the two β-blockers was the higher incidence of sleep disturbances with pindolol which may be due to the higher lipophilicity of this β-blocker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543717
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  • 5
    Electronic Resource
    Electronic Resource
    Provocative Testing in Children with Suspect Congenital Long QT Syndrome (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of noninvasive electrocardiology 3 (1998), S. 0 
    Details
    ISSN: 1542-474X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study was designed to evaluate several alternative ECG measurements and provocative tests in order to identify markers for children with suspect congenital long QT syndrome (LQTS).〈section xml:id="abs1-2"〉〈title type="main"〉BackgroundA single QTc measurement on a resting ECG does not identify all children with LQTS. Alternative ECG measurements have been established for identification of LQTS patients, with varied degrees of accuracy. Additionally, findings of QT prolongation during exercise or catecholaminergic stimulation have been suggested as indicators for the presence of LQTS and associated arrhythmias.〈section xml:id="abs1-3"〉〈title type="main"〉MethodsThe ECGs from 40 children with suspect congenital LQTS were compared with 1000 gender and age matched control patients. Complete exercise ECG studies were performed on 32 of the 40 suspect LQTS patients and compared with 29 controls. ECGs recorded during isoproterenol infusion were obtained in 9 suspect LQTS patients and compared with 44 matched control subjects.〈section xml:id="abs1-4"〉〈title type="main"〉ResultsDuring exercise, the QTc was mildly prolonged in both groups, without a similar increase in JTc, suggesting prolongation of depolarization time. QT and JT dispersion shortened with exercise in control subjects, but not in the suspect LQTS patients. During isoproterenol infusion, the QTc and JTc are prolonged in the suspect LQTS group, without an increase in the control patients.〈section xml:id="abs1-5"〉〈title type="main"〉ConclusionsWe describe the ECG findings with provocative testing in patients in whom there is a clinical suspicion of LQTS, yet have a normal or borderline QTc. Exercise or isoproterenol may aid in identification of patients with congenital long QT syndrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1542-474X.1998.tb00023.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Multisite Ventricular Pacing on Cardiac Function in Normal Dogs and Dogs with Heart Failure (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 10 (1999), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Multisite Ventricular Pacing in Heart Failure. Introduction: We studied the effects on cardiac function of pacing two right and two left ventricular sites in normal and failing hearts with a normal QRS duration. Methods and Results: Hemodynamic parameters were studied in isoflurane-anesthetized dogs with normal hearts and dogs with heart failure induced by rapid ventricular pacing. Unipolar intramyocardial electrodes were placed at the high right atrium and the apex (A) and base (B) of the left (L) and right (R) ventricles (V). Data were collected after pacing for 5 to 20 minutes. In normal dogs, without bundle branch block (BBB), pacing at either the apex or the base of the left ventricle increased cardiac output by approximately 10% compared with right ventricular apex (RVA) pacing with an AV delay of 10 msec. Positive dP/dt increased approximately 10% during four-site left and right ventricular apex and base (LRVAB) pacing compared with RVA pacing. In dogs with heart failure but without BBB, cardiac output increased by 8.5% (P 〈 0.01) during four-site ventricular pacing with AV delays of 0 and 60 msec compared with RVA pacing. Positive dp/dt increased by 23.5% (P 〈 0.001) with an AV delay of 0 msec and 9.6% (P 〈 0.001) with an AV delay of 60 msec during LRVAB pacing compared with RVA pacing. His-bundle pacing was associated with increased cardiac output compared with RVA pacing. Conclusions: We conclude that pacing simultaneously at two right and two left ventricular sites significantly improves cardiac function compared with single RVA pacing, with or without sequential AV synchrony, in dogs with rapid ventricular pacing-induced heart failure and no BBB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1999.tb01264.x
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  • 7
    Electronic Resource
    Electronic Resource
    VERTICAL HETEROGENEITY AND MOVEOUT IN THE ONE-DIMENSIONAL MEDIUM (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 35 (1987), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Since the important contributions of Dürbaum and Dix, 30 years ago, velocity profile estimation procedures on horizontally layered and vertically heterogeneous media from seismic probing data have been based largely on hyperbolic moveout models and RMS and stacking velocity concepts. Re-examination of the fundamentals reveals that quantitative velocity heterogeneity and canonical valocity profiles have been implicit factors for moveout modelling and for profile inversion in the use of the Dix procedure. Heterogeneity h is the ratio (and vRMS the geometric or harmonic mean) of the path-average and time-average velocities for a raypath or, in a more restricted sense, for the normal ray belonging to a velocity profile. The canonical profile for a given velocity profile or profile segment is a moveout-equivalent monotonically increasing ramp-like profile.The ramp or constant gradient in depth is the simplest velocity profile approximator which can explicitly accommodate velocity heterogeneity. A ramp model structure is detailed which facilitates moveout simulation and model parameter estimation, and the parametric effects are explored. The horizontal offset range is quantified for which this model can give good moveout approximations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1987.tb00845.x
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  • 8
    Electronic Resource
    Electronic Resource
    Flux-creep-limited critical currents in YBa2Cu3O7−δ ceramics (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1135-1137 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical currents of YBa2Cu3O7−δ bulk-sintered samples were measured at and above 77 K in the presence of magnetic fields. In moderate magnetic fields a H−n dependence with n〈1 was observed. Transport measurements give n(approximately-equal-to)0.5, indicating that critical currents are limited by flux creep rather than by field quenching of Josephson junctions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102459
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  • 9
    Electronic Resource
    Electronic Resource
    Lattice site location studies of ion implanted 8Li in GaN (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3085-3089 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The lattice sites of ion implanted Li atoms in GaN were studied as a function of implantation temperature between room temperature and 770 K. We measured the channeling and blocking patterns of α-particles emitted in the radioactive decay of implanted 8Li ions to determine the Li lattice sites. Below 700 K Li atoms occupy mainly interstitial sites in the center of the c-axis hexagons at positions c/4 and 3c/4, where c is the lattice constant in c-axis direction. Around 700 K Li starts to diffuse and presumably interacts with vacancies created in the implantation process. This leads to the formation of substitutional Li above 700 K. An activation energy of about 1.7 eV for interstitial Li diffusion was determined. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368463
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  • 10
    Electronic Resource
    Electronic Resource
    Pulse radiolysis equipment: A setup for simultaneous multiwavelength kinetic spectroscopy (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 363-368 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A setup for pulse radiolysis experiments is described consisting of the following main components: an array of 15 photomultipliers attached to a spectrograph (allowing 4032 spectra to be recorded with a time resolution of 500 ns per spectrum), self-regulating high-voltage supply for the photomultipliers, computer-controlled solution mixing and dispensing system, and provisions for continuous dose variation of the FEBETRON-accelerator electron beam. The general performance of the system is discussed and construction or electronic details are given for special components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139289
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