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See detailHeart Graft Monitoring by the Ventricular Evoked Response
Mahaux, V.; Demoulin, J.C.; BIESSAUX, Yves ULg et al

in Pacing & Clinical Electrophysiology (2000), 23(11, Pt 2), 2003-5

Monitoring of the negative slew rate of the evoked T wave has been proposed as a noninvasive diagnostic tool to follow heart transplant recipients. The clinical contribution of this measurement on ... [more ▼]

Monitoring of the negative slew rate of the evoked T wave has been proposed as a noninvasive diagnostic tool to follow heart transplant recipients. The clinical contribution of this measurement on telemetrically recorded, paced unipolar ventricular electrograms was evaluated in the detection of grade 3 acute allograft rejection. Thirteen patients undergoing heart transplantation received a DDD pacemaker connected to two epimyocardial leads. Electrograms were recorded and digitized after each endomyocardial biopsy (EMB). The maximum slew rate of the descending slope of the repolarization phase (RSP) was extracted and normalized. A 20% downward shift of RSP from the reference value was considered abnormal. Results of signal processing were blinded during the first 6 months. Eleven patients completed the 6 months blinded period and two patients died. A total of 101 EMB were graded according to the International Society for Heart and Lung Transplantation classification. Grade 3 was assigned to 9 EMB. A significant difference was found between RSP values measured during grade 3 rejection episodes and other RSP values (P < 0.001). A diagnostic model consisting of a single threshold test confirmed the ability of RSP to predict significant signs of rejection on EMB (P < 0.0001). The sensitivity of RSP in detecting grade 3 rejections was 100%, specificity was 81%, negative predictive value 100%, and positive predictive value 35%. The use of RSP as a noninvasive monitoring tool to pose the indication for a biopsy would avoid 73% of EMB. Monitoring of transplanted hearts based on the analysis of the ventricular evoked response is promising and may markedly reduce the number of EMB. [less ▲]

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See detailHeart rate and spontaneous work-rest cycles during exposure to heat
Vogt, J. J.; Libert, J. P.; Candas, V. et al

in Ergonomics (1983), 26(12), 1173-85

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See detailHeart rate and use of beta-blockers in stable outpatients with coronary artery disease.
Steg, Ph Gabriel; Ferrari, Roberto; Ford, Ian et al

in PLoS ONE (2012), 7(5), 36284

BACKGROUND: Heart rate (HR) is an emerging risk factor in coronary artery disease (CAD). However, there is little contemporary data regarding HR and the use of HR-lowering medications, particularly beta ... [more ▼]

BACKGROUND: Heart rate (HR) is an emerging risk factor in coronary artery disease (CAD). However, there is little contemporary data regarding HR and the use of HR-lowering medications, particularly beta-blockers, among patients with stable CAD in routine clinical practice. The goal of the present analysis was to describe HR in such patients, overall and in relation to beta-blocker use, and to describe the determinants of HR. METHODS AND FINDINGS: CLARIFY is an international, prospective, observational, longitudinal registry of outpatients with stable CAD, defined as prior myocardial infarction or revascularization procedure, evidence of coronary stenosis of >50%, or chest pain associated with proven myocardial ischemia. A total of 33,438 patients from 45 countries in Europe, the Americas, Africa, Middle East, and Asia/Pacific were enrolled between November 2009 and July 2010. Most of the 33,177 patients included in this analysis were men (77.5%). Mean (SD) age was 64.2 (10.5) years, HR by pulse was 68.3 (10.6) bpm, and by electrocardiogram was 67.2 (11.4) bpm. Overall, 44.0% had HR >/= 70 bpm. Beta-blockers were used in 75.1% of patients and another 14.4% had intolerance or contraindications to beta-blocker therapy. Among 24,910 patients on beta-blockers, 41.1% had HR >/= 70 bpm. HR >/= 70 bpm was independently associated with higher prevalence and severity of angina, more frequent evidence of myocardial ischemia, and lack of use of HR-lowering agents. CONCLUSIONS: Despite a high rate of use of beta-blockers, stable CAD patients often have resting HR >/= 70 bpm, which was associated with an overall worse health status, more frequent angina and ischemia. Further HR lowering is possible in many patients with CAD. Whether it will improve symptoms and outcomes is being tested. [less ▲]

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See detailHeart rate decrease induced by BPDZ 259, a diazoxide analogue
Damas, J.; Pirotte, Bernard ULg

Poster (2000, November 18)

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See detailHeart rate variability in infants with obstructive sleep apnea
Massin, M. M.; Withofs, Nadia ULg; Ravet, Françoise ULg

in Archives de Pédiatrie (2002), 9(4), 444-445

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See detailHeart rate, hematological and serum biochemical responses to show jumping
Lekeux, Pierre ULg; Art, Tatiana ULg; Linden, Annick ULg et al

in Persson, S. G. B.; Lindholm, A.; Jeffcott, L. B. (Eds.) Equine Exercise Physiology III (1991)

Changes in heart rate (HR), plasma lactate (LA) and some other blood parameters were studied in 16 healthy show jumping horses participating in the Belgian Junior Championship. Venous blond was collected ... [more ▼]

Changes in heart rate (HR), plasma lactate (LA) and some other blood parameters were studied in 16 healthy show jumping horses participating in the Belgian Junior Championship. Venous blond was collected from each horse before and immediately after competing and was analysed for packed cell volume (PCV), LA, plasma cortisol, blood glucose (GLU), total plasma protein bicarbonate ions and serum levels of lactate dehydrogenase, creatine kinase, aspartate aminotransferase and gamma glutamyl transferase (GGT). A HR recorder placed under the saddle continuously recorded HR from the warm-up tu 5 min after the course in 10 horses. Show jumping induced a significant increase in all parameters, except GLU, which decreased significantly, and GGT which remained unchanged. Resting values of LA and HR were 0.43±0.05 mmol I-1 and 44.7±2.9 beau min-1 respectively. Post-exercise LA reached a mean value of 8.7±0.5 mmol I-1, while HR rose to a peak of 189.2±3.5 beau min-1 during Ihe course. The results of the present study demonstrated that, although the speed and duration of such an exercise are low, show jumping represents severe exertion which requires some anaerobic metabolism. [less ▲]

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See detailHeart structure and ventricular ultrastructure of hemoglobin- and myoglobin-free icefish Channichthys rhinoceratus
Feller, Georges ULg; Goessens, G.; Gerday, Charles ULg et al

in Cell & Tissue Research (1985), 242

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See detail“A Heart to Speak of ”: Authorial Sacrifice in Janet Frame’s “Jan Godfrey” and Other Texts
Gabrielle, Cindy ULg

in Commonwealth : Essays and Studies (2012), 34(2),

This essay examines Janet Frame’s “Jan Godfrey” with a view to demonstrating that its author-figure writes a story that is not a story as long as she hesitates to grant her (re-) created Other full access ... [more ▼]

This essay examines Janet Frame’s “Jan Godfrey” with a view to demonstrating that its author-figure writes a story that is not a story as long as she hesitates to grant her (re-) created Other full access to the speaking position she occupies. The idea explored in “Jan Godfrey,” that non-stories of avoidance are in fact narratives of ontological decimation will, then, be shown to tie in with Frame’s belief that true art occurs at the edge of non-being. [less ▲]

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See detailHeart Valve Clinic: Rationale and Organization.
Lancellotti, Patrizio ULg; Rosenhek, Raphael; Pibarot, Philippe

in The Canadian journal of cardiology (2014)

With an increasing prevalence of patients with valvular heart disease (VHD), a dedicated management approach delivered in a well-defined structure, namely, the heart valve clinic (HVC), is warranted. The ... [more ▼]

With an increasing prevalence of patients with valvular heart disease (VHD), a dedicated management approach delivered in a well-defined structure, namely, the heart valve clinic (HVC), is warranted. The HVC is made up of a multidisciplinary team with high expertise in the diagnosis, management, treatment, and surveillance of patients with VHD. The aim of the HVC is to provide the highest quality of care to patients with VHD to improve the level of adherence to current evidence and guidelines, quality of life, and short- and long-term outcomes. The HVC also provides help in (1) informing and educating patients to motivate them to take their prescribed medications and look out for signs indicating a worsening of their disease, (2) organizing meetings for updates in knowledge for modern management of patients with VHD, and (3) disseminating protocols of contemporary and good practice in VHD. [less ▲]

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See detailHeartburn in Belgium: prevalence, impact on daily life, and utilization of medical resources
Louis, Edouard ULg; DeLooze, D.; Deprez, P. et al

in European Journal of Gastroenterology & Hepatology (2002), 14(3), 279-284

Background Gastro-oesophageal reflux disease (GORD) is a frequently occurring disease that may be considered a public health issue, particularly in developed countries. The specificity of heartburn for ... [more ▼]

Background Gastro-oesophageal reflux disease (GORD) is a frequently occurring disease that may be considered a public health issue, particularly in developed countries. The specificity of heartburn for the diagnosis of GORD is good. Our aim was to define the prevalence of heartburn in Belgium, characterizing both its impact on everyday life and the ensuing use of medical resources. Methods Two thousand people living in Belgium, selected randomly after stratification, were interviewed face to face. The main question in the questionnaire used in this interview concerned the presence over the previous 12 months of a burning sensation in the epigastric and/or retrosternal region. This was followed by 21 secondary questions on the characteristics of the population studied, the impact of heartburn on everyday life, and the medical resources used. Results Twenty-eight per cent of the population interviewed reported heartburn. This symptom was present at least once a week in 42% of sufferers. Heartburn was more frequent in women than men (P < 0.05) and was not distributed uniformly throughout the various regions of the country (P < 0.05). Seventy-seven per cent of the people with heartburn found that it had a significantly negative impact on their daily lives (in 27%, this effect was strong). Heartburn associated with a substantial negative impact on daily life was characterized by a higher frequency of symptoms (P < 0.0001), a longer duration of the problem (P= 0.006), and the presence of pain (P < 0.0001) and anxiety (P < 0.0001). Fifty-six per cent of individuals with heartburn had already sought medical advice, 45% had undergone an upper-gastrointestinal tract endoscopy, and 59% were taking medications. Among patients complaining that heartburn had a substantial negative effect on their everyday lives, 21.6% had not sought medical advice and 22.2% did not take any medication. Conclusion Heartburn is very frequent in Belgium and is associated with a considerable negative impact on everyday life. It also generates a significant use of medical resources. However, among the patients complaining of a substantial negative effect on their daily lives, one-fifth (which would represent 1.5% of the Belgian population) seemed to lack appropriate care. [less ▲]

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See detailA heat and dye tracer test for characterizing and modelling heat transfer in an alluvial aquifer
Klepikova, Maria ULg; Wildemeersch, Samuel; Jamin, Pierre ULg et al

Poster (2014, September 22)

Using heat as an active tracer is a topic of increasing interest with regards to characterizing shallow aquifers for ATES (Aquifer Thermal Energy Storage) systems. In this study, we investigate the ... [more ▼]

Using heat as an active tracer is a topic of increasing interest with regards to characterizing shallow aquifers for ATES (Aquifer Thermal Energy Storage) systems. In this study, we investigate the potential interest of coupling simultaneous heat and dye tracer injection tests for characterization of an alluvial aquifer. The study site is located near Liege in the alluvial aquifer of the Meuse River, Belgium. The tracing experiment consisted in simultaneously injecting heated water and a dye tracer in a piezometer and monitoring the evolution of groundwater temperature and tracer concentration in the recovery well and in nine monitoring wells located according to three transects with regards to the main groundwater flow direction. The breakthrough curves measured in the recovery well showed that heat transfer in the alluvial aquifer is slower and more dispersive than solute transport. Recovery is very low for heat while in the same time it is measured as relatively high for the solute tracer. This shows how heat diffusion is larger than molecular diffusion, implying that exchange between groundwater and the porous medium matrix is far more significant for heat than for solute tracers. In a first step, temperature and concentrations in the recovery well are used for estimating the specific heat capacity with an energy balance calculation and the estimated value is found to be consistent with those found in the literature. Then, the measured temperature breakthrough curves in the piezometers are used for constraining the heat transport model. They are highly contrasted with what would be expected in an ideal layered aquifer. They reveal strongly unequal lateral and vertical components of the transport mechanisms. A preliminary interpretation of these temperature breakthrough curves is provided with first results from the model. Then it will allow for estimating the entire set of heat transfer parameters and their spatial distribution by inverse modelling. The developed concepts and tests may lead to real projects of various extents that can be now optimized by the use of a rigorous and efficient methodology at the field scale. [less ▲]

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See detailHeat and mass balances on an anaerobic digester treating agricultural wastes
Piemme, Olivier; Lebon, F.; Crine, Michel ULg

in Biomass for Energy, Environment, Agriculture and Industrie (1995)

Detailed reference viewed: 38 (3 ULg)
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See detailHeat and mass transfer coefficient analysis during rock convective drying
Prime, Noémie ULg; Housni, Zakarya; Fraikin, Laurent ULg et al

Conference (2013, August)

This paper presents some experimental investigations about convective drying of rocks. Cylindrical samples made of limestone are dried from one their bases submitted to an air flow, while the other ... [more ▼]

This paper presents some experimental investigations about convective drying of rocks. Cylindrical samples made of limestone are dried from one their bases submitted to an air flow, while the other surfaces are hermetically covered. All other factors being equal, the influence of two parameters is looked after: the cylinder height, equivalent to the volume/surface ratio of the samples, and the direction of the air flow. The tests are interpreted both from the drying curves and from the values of water and heat transfer coefficients. Results first highlight that air flow incidence on the dried surface changes the kinetics and the transfer coefficient values. It can thus be supposed that the air flow direction would modify the thickness of the transfer limit layer at the surface and/or would make invalid the hypothesis of such a limit layer model for some flow configurations. Besides, the volume/surface ratio is shown to be correlated to the evaporation flux on the constant drying phase, and thus to the transfer coefficients. Nonetheless, this link tends to disappear from sufficiently high values of the volume/surface ratio since, in this case, the transfer coefficients reach constant values. This effect, in addition to other observations made on the drying curves, well fits with the hypothesis of a hydraulically connected layer below the drying surface, which would maintain during the constant drying rate phase. In the present case, this layer would have a thickness of around 20 to 30 mm. [less ▲]

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See detailHeat can erase epigenetic marks of vernalization in Arabidopsis
Bouché, Frédéric ULg; Detry, Nathalie ULg; Périlleux, Claire ULg

in Plant Signaling & Behavior (2015), 10(3), 990799

Vernalization establishes a memory of winter that must be maintained for weeks or months in order to promote flowering the following spring. The stability of the vernalized state varies among plant ... [more ▼]

Vernalization establishes a memory of winter that must be maintained for weeks or months in order to promote flowering the following spring. The stability of the vernalized state varies among plant species and depends on the duration of cold exposure. In Arabidopsis thaliana, winter leads to epigenetic silencing of the floral repressor gene FLOWERING LOCUS C (FLC) and the duration of cold is measured through the dynamics of chromatin modifications during and after cold. The growing conditions encountered post-vernalization are thus critical for the maintenance of the vernalized state. We reported that high temperature leads to devernalization and, consistently, to FLC reactivation in Arabidopsis seedlings. Here we show that the repressive epigenetic mark H3K27me3 decreases at the FLC locus when vernalized seedlings are grown at 30°C, unless they were first exposed to a stabilizing period at 20°C. Ambient temperature thus controls the epigenetic memory of winter. [less ▲]

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See detailHeat generation and transfer due to friction and plastic dissipation - a coupled thermomechanical approach
Adam, L.; Ponthot, Jean-Philippe ULg

in Proceedings of HEFAT 2003, 2nd International conference on Heat Transfer, Fluid Mechanics and Thermodynamics (2003)

Detailed reference viewed: 40 (1 ULg)
See detailHeat generation due to friction and plastic dissipation – a coupled thermomechanical approach for impact and metal forming simulation
Adam, L.; Ponthot, Jean-Philippe ULg

in Proceedings of Int. Conf. on Computational Methods for Coupled Problems in Science and Engineering – COUPLED PROBLEMS 2005 (2005)

Detailed reference viewed: 71 (1 ULg)
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See detailA heat injection and pumping experiment in a gravel aquifer monitored with crosshole electrical resistivity tomography
Hermans, Thomas ULg; Wildemeersch, Samuel ULg; Jamin, Pierre ULg et al

in EarthDoc - Near Surface Geosciences 2013 - 19th European Meeting of Environmental and Engineering Geophysics (2013, September)

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has ... [more ▼]

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has proven its ability to monitor salt tracer tests, but few studies have investigated its performances in thermal tracing experiments. In this study, we monitor the injection and pumping of heated water using crosshole ERT in a panel crossing the main flow direction. Difference inversion time-lapse images clearly show the heterogeneous pattern of resistivity changes, and thus temperature changes, highlighting the existence of preferential flow paths in the aquifer. Comparison of temperature estimates from ERT and direct measurements in boreholes show the ability of ERT to quantify the temperatures in the aquifer and to draw the breakthrough curves of the thermal tracer with a relative accuracy. Such resistivity data may provide important information to improve hydrogeological models. Our study proves that ERT, especially crosshole ERT, is a reliable tool to follow thermal tracing experiments. It also confirms that ERT should be included to in situ techniques to characterize heat transfer in the subsurface and to monitor geothermal resources exploitation. [less ▲]

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See detailA heat piloted residential 5 kW fuel cell
Lilien, Jean-Louis ULg; Maréchal, François; Lerson, Sébastien et al

(2004, August)

based on residential house demand (electrical, heating, domestic hot water), the optimisation of the use of a SOFC fuel cell of about 5 kWe is detailed to reduce CO2 emission at their minimum.

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See detailHeat Pumping and Reversible Air Conditioning - First Case Study Results
Aparecida Silva, Cleide; Bertagnolio, Stéphane ULg; Hannay, Jules et al

Conference (2007, April)

Detailed reference viewed: 72 (4 ULg)