Titre : Forêts

Forêts : Questions médicales fréquentes

Termes MeSH sélectionnés :

Perfusion
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"https://questionsmedicales.fr/mesh/D065928?mesh_terms=Perfusion&page=3#section-facteurs de risque" } ] }, { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Comment évaluer la santé d'une forêt ?", "position": 1, "acceptedAnswer": { "@type": "Answer", "text": "On évalue la diversité des espèces, la qualité du sol et la présence de maladies." } }, { "@type": "Question", "name": "Quels indicateurs montrent une déforestation ?", "position": 2, "acceptedAnswer": { "@type": "Answer", "text": "La réduction de la couverture forestière et l'augmentation des terres agricoles sont des indicateurs." } }, { "@type": "Question", "name": "Comment détecter les maladies des arbres ?", "position": 3, "acceptedAnswer": { "@type": "Answer", "text": "L'observation des symptômes comme le flétrissement, les taches foliaires et la mortalité des branches aide au diagnostic." } }, { "@type": "Question", "name": "Quels outils mesurent la biodiversité forestière ?", "position": 4, "acceptedAnswer": { "@type": "Answer", "text": "Des outils comme les inventaires floristiques et faunistiques sont utilisés pour mesurer la biodiversité." } }, { "@type": "Question", "name": "Comment évaluer l'impact des incendies sur les forêts ?", "position": 5, "acceptedAnswer": { "@type": "Answer", "text": "On analyse la superficie brûlée, la régénération des espèces et les changements dans l'écosystème." } }, { "@type": "Question", "name": "Quels signes indiquent une forêt en déclin ?", "position": 6, "acceptedAnswer": { "@type": "Answer", "text": "Une diminution de la biodiversité, des arbres malades et une érosion accrue sont des signes." } }, { "@type": "Question", "name": "Comment reconnaître une invasion d'espèces exotiques ?", "position": 7, "acceptedAnswer": { "@type": "Answer", "text": "L'apparition soudaine d'espèces non indigènes et leur domination sur les espèces locales sont des signes." } }, { "@type": "Question", "name": "Quels symptômes montrent un stress hydrique dans les forêts ?", "position": 8, "acceptedAnswer": { "@type": "Answer", "text": "Les feuilles jaunissent, tombent prématurément et les arbres montrent un flétrissement." } }, { "@type": "Question", "name": "Quels signes indiquent une pollution forestière ?", "position": 9, "acceptedAnswer": { "@type": "Answer", "text": "La décoloration des feuilles, la mortalité des arbres et la présence de dépôts toxiques sont des signes." } }, { "@type": "Question", "name": "Comment identifier les effets du changement climatique sur les forêts ?", "position": 10, "acceptedAnswer": { "@type": "Answer", "text": "On observe des changements dans la phenologie, la distribution des espèces et la mortalité des arbres." } }, { "@type": "Question", "name": "Comment prévenir la déforestation ?", "position": 11, "acceptedAnswer": { "@type": "Answer", "text": "La mise en place de lois, la sensibilisation et la promotion de l'agriculture durable sont essentielles." } }, { "@type": "Question", "name": "Quelles actions protègent les forêts contre les incendies ?", "position": 12, "acceptedAnswer": { "@type": "Answer", "text": "La création de pare-feux, la gestion des combustibles et l'éducation du public sont des actions préventives." } }, { "@type": "Question", "name": "Comment limiter l'impact des changements climatiques sur les forêts ?", "position": 13, "acceptedAnswer": { "@type": "Answer", "text": "La réduction des émissions de gaz à effet de serre et l'adaptation des pratiques forestières sont cruciales." } }, { "@type": "Question", "name": "Quelles stratégies protègent la biodiversité forestière ?", "position": 14, "acceptedAnswer": { "@type": "Answer", "text": "La création de réserves naturelles et la mise en œuvre de lois de protection sont des stratégies efficaces." } }, { "@type": "Question", "name": "Comment sensibiliser à la protection des forêts ?", "position": 15, "acceptedAnswer": { "@type": "Answer", "text": "Des campagnes éducatives, des programmes scolaires et des événements communautaires sensibilisent le public." } }, { "@type": "Question", "name": "Quelles méthodes restaurent une forêt dégradée ?", "position": 16, "acceptedAnswer": { "@type": "Answer", "text": "La reforestation, l'enrichissement et la gestion durable des ressources sont des méthodes efficaces." } }, { "@type": "Question", "name": "Comment traiter les maladies des arbres ?", "position": 17, "acceptedAnswer": { "@type": "Answer", "text": "Des traitements phytosanitaires, la taille des branches malades et la sélection d'espèces résistantes sont utilisés." } }, { "@type": "Question", "name": "Quelles pratiques favorisent la biodiversité forestière ?", "position": 18, "acceptedAnswer": { "@type": "Answer", "text": "La création de corridors écologiques et la protection des habitats naturels favorisent la biodiversité." } }, { "@type": "Question", "name": "Comment gérer les espèces envahissantes ?", "position": 19, "acceptedAnswer": { "@type": "Answer", "text": "L'élimination manuelle, l'utilisation de biocides et la restauration des habitats sont des stratégies." } }, { "@type": "Question", "name": "Quelles techniques améliorent la résilience des forêts ?", "position": 20, "acceptedAnswer": { "@type": "Answer", "text": "La diversification des espèces et la gestion adaptative des forêts améliorent leur résilience." } }, { "@type": "Question", "name": "Quelles sont les conséquences de la déforestation ?", "position": 21, "acceptedAnswer": { "@type": "Answer", "text": "La perte de biodiversité, l'érosion des sols et le changement climatique sont des conséquences majeures." } }, { "@type": "Question", "name": "Comment la pollution affecte-t-elle les forêts ?", "position": 22, "acceptedAnswer": { "@type": "Answer", "text": "La pollution de l'air et du sol peut entraîner des maladies des plantes et la perte de biodiversité." } }, { "@type": "Question", "name": "Quels risques posent les espèces envahissantes ?", "position": 23, "acceptedAnswer": { "@type": "Answer", "text": "Les espèces envahissantes peuvent réduire la biodiversité et perturber les écosystèmes locaux." } }, { "@type": "Question", "name": "Quelles sont les répercussions des incendies de forêt ?", "position": 24, "acceptedAnswer": { "@type": "Answer", "text": "Les incendies peuvent détruire des habitats, libérer du carbone et affecter la qualité de l'air." } }, { "@type": "Question", "name": "Comment le changement climatique impacte-t-il les forêts ?", "position": 25, "acceptedAnswer": { "@type": "Answer", "text": "Il provoque des changements dans la distribution des espèces, des sécheresses et des maladies des arbres." } }, { "@type": "Question", "name": "Quels facteurs augmentent le risque de déforestation ?", "position": 26, "acceptedAnswer": { "@type": "Answer", "text": "L'expansion agricole, l'urbanisation et l'exploitation forestière non durable sont des facteurs clés." } }, { "@type": "Question", "name": "Comment le changement climatique influence-t-il les forêts ?", "position": 27, "acceptedAnswer": { "@type": "Answer", "text": "Il augmente la fréquence des événements extrêmes comme les sécheresses et les tempêtes, affectant les forêts." } }, { "@type": "Question", "name": "Quels sont les impacts de l'urbanisation sur les forêts ?", "position": 28, "acceptedAnswer": { "@type": "Answer", "text": "L'urbanisation entraîne la fragmentation des habitats et la perte de biodiversité forestière." } }, { "@type": "Question", "name": "Comment les pratiques agricoles affectent-elles les forêts ?", "position": 29, "acceptedAnswer": { "@type": "Answer", "text": "Les pratiques agricoles intensives peuvent entraîner la déforestation et la dégradation des sols." } }, { "@type": "Question", "name": "Quels risques posent les maladies des arbres ?", "position": 30, "acceptedAnswer": { "@type": "Answer", "text": "Les maladies peuvent se propager rapidement, entraînant la mortalité des arbres et la perte de biodiversité." } } ] } ] }

Sources (3155 au total)

Lung preservation: from perfusion to temperature.

This article will review the evidence behind elements of the lung preservation process that have remained relatively stable over the past decade as well as summarize recent developments in ex-vivo lun... Ex-vivo lung perfusion is becoming an increasingly well established means to facilitate greater travel distance and allow for continued reassessment of marginal donor lungs. Preliminary reports of the... It is crucial to understand the fundamental principles of organ preservation to ensure optimal lung function posttransplant. Recent advances in the past several years have the potential to challenge s...

Assessment of perfusion deficit with early phases of [

Characteristic features of amyloid-PET (A), tau-PET (T), and FDG-PET (N) can serve for the A/T/N classification of neurodegenerative diseases. Recent studies showed that the early, perfusion-weighted ... We obtained early-phase PET recordings with [... The z-scores of perfusion-weighted images of both tracers showed high correlations across the brain, especially in the frontal and parietal lobes, which were the brain regions with pronounced perfusio... The early perfusion phases of [...

Regional myocardial perfusion imaging in predicting vessel-related outcome: interplay between the perfusion results and angiographic findings.

Despite myocardial perfusion imaging (MPI) by cadmium-zinc-telluride (CZT) single-photon emission computed tomography (SPECT) camera is largely used in the diagnosis and risk stratification of patient... Five hundred and forty-one subjects with suspected or known CAD referred to 99mTc-sestamibi gated CZT-SPECT cardiac imaging and with available angiographic data were studied. Both regional total perfu... Regional myocardial perfusion assessed by the CZT camera demonstrated good reliability in predicting vessel-related events in patients with suspected or known CAD....

Is the optimal Tmax threshold identifying perfusion deficit volumes variable across MR perfusion software packages? A pilot study.

Accurate quantification of ischemic core and ischemic penumbra is mandatory for late-presenting acute ischemic stroke. Substantial differences between MR perfusion software packages have been reported... The HIBISCUS-STROKE cohort includes acute ischemic stroke patients treated by mechanical thrombectomy after MRI triage. Mechanical thrombectomy failure was defined as a modified thrombolysis in cerebr... Eighteen patients were included. Lengthening the threshold from ≥ 6 s to ≥ 10 s led to significantly smaller perfusion deficit volumes for both packages. For package A, Tmax ≥ 6 s and ≥ 8 s moderately... The optimal Tmax threshold for defining the ischemic penumbra appeared to be most accurate at ≥ 6 s for package A and ≥ 10 s for package B. This implies that the widely recommended Tmax threshold ≥ 6 ...

Feasibility of deconvolution-based multiphase CT angiography perfusion maps in acute ischemic stroke: Simulation and concordance with CT perfusion.

Integration of CT perfusion (CTP) with requisite non-contrast CT and CT angiography (CTA) stroke imaging may allow efficient stroke lesion volume measurement. Using surrogate images from CTP, we simul... Patients with acute ischemic stroke who received admission CTP were included in this study. Four CTP images (surrogate mCTA, one pre-contrast and three post-contrast, starting at the arterial peak the... Of 34 included patients, 28 had target mismatch and 6 did not by standard CTP. Accuracy of classifying target mismatch profiles with surrogate mCTA was 79% with respect to that from standard CTP. Mean... Surrogate mCTA ischemic lesion volumes agreed with those from standard CTP and may be an efficient alternative when CTP is not practical....

Normothermic machine perfusion for older transplant recipients.

Elderly patients (≥65 years old) are increasingly undergoing liver transplantation and are more likely to be removed from the waitlist. Normothermic machine perfusion (NMP) holds promise in expanding ... The use of NMP on outcomes in elderly recipients was reviewed using both the UNOS/SRTR database (2016-2022) and institutional data (2018-2020). Characteristics and clinical outcomes were compared betw... Nationally, using the UNOS/SRTR database, we identified 165 elderly recipients from 28 centers who received a liver allograft undergoing NMP and 4270 that underwent traditional cold static storage. NM... NMP may mitigate donor risk factors that are relative contraindications for transplantation in elderly liver recipients, increasing the donor pool. The application of NMP in older recipients should be...

Using organ perfusion to optimize donor livers.

The shortage of donor organs has led to the use of marginal extended criteria donor (ECD) livers to increase access to liver transplant. Ex-vivo machine perfusion allows for treatment and assessment o... Multiple randomized controlled trials on the use of hypothermic machine perfusion (HMP) and normothermic machine perfusion (NMP) have been published in the past 5 years demonstrating improved graft fu... There is now a body of evidence that HMP and NMP treatment improves clinical outcomes in ECD livers. There is a wide horizon for future applications of these preservation techniques to further optimiz...