14 research outputs found
On the evolution of vortex in locally isothermal self-gravitating discs: a parameter study
Gas rich dusty circumstellar discs observed around young stellar objects are
believed to be the birthplace of planets and planetary systems. Recent
observations revealed that large-scale horseshoe-like brightness asymmetries
are present in dozens of transitional protoplanetary discs. Theoretical studies
suggest that these brightness asymmetries bf could be caused by large-scale
anticyclonic vortices triggered by the Rossby Wave Instability (RWI), which can
be excited at the edges of the accretionally inactive region, the dead zone
edge. Since vortices may play a key role in planet formation, investigating the
conditions of the onset of RWI and the long-term evolution of vortices is
inevitable. The aim of our work was to explore the effect of disc geometry (the
vertical thickness of the disc), viscosity, the width of the transition region
at the dead zone edge, and the disc mass on the onset, lifetime, strength and
evolution of vortices formed in the disc. We performed a parametric study
assuming different properties for the disc and the viscosity transition by
running 1980 2D hydrodynamic simulations in the locally isothermal assumption
with disc self-gravity included. Our results revealed that long-lived,
large-scale vortex formation favours a shallow surface density slope and low-
or moderate disc masses with Toomre , where is the
geometric aspect ratio of the disc. In general, in low viscosity models,
stronger vortices form. However, rapid vortex decay and re-formation is more
widespread in these discs.Comment: 20 pages, 20 figs., 3 tables. Accepted to MNRA
A mellkassebĂ©szeti műtĂ©ti teherbĂrĂłkĂ©pessĂ©g megĂtĂ©lĂ©se, perioperatĂv lĂ©gzĂ©srehabilitáciĂł
Absztrakt:
Bevezetés: A mellkassebészeti operabilitást onkológiai,
sebésztechnikai szempontok mellett meghatározzák a funkcionális paraméterek.
SzĂĽksĂ©ges a mellkasi műtĂ©ti teherbĂrĂł kĂ©pessĂ©g Ă©s a lehetsĂ©ges posztoperatĂv
szövődmények megbecslése. Célkitűzés: A funkcionális
operabilitás megĂtĂ©lĂ©sĂ©rĹ‘l szĂłlĂł nemzetközi irodalom Ă©s intĂ©zetĂĽnk gyakorlatának
áttekintése. Módszer: A mellkassebészeti műtéti
rizikóbecsléshez szakirodalmi áttekintést végeztünk, előtérbe helyezve a
légzésfunkciós, légzésmechanikai, mellkasi kinematikai, terhelés-élettani
változĂłkrĂłl szĂłlĂł közlemĂ©nyeket. A lĂ©gzĂ©srehabilitáciĂł szĂv-Ă©r rendszeri,
izmokra, lĂ©gzĂ©smechanikára, teljesĂtĹ‘kĂ©pessĂ©gre Ă©s Ă©letminĹ‘sĂ©gre kifejtett
hatását vizsgáltuk. LaborparamĂ©terek, társbetegsĂ©gek, az elhĂzás, a lesoványodás
és a dohányzás rizikóját értékeltük. Eredmények: A magas
vércukorszint, alacsony albuminszint és az emelkedett vesefunkciós értékek
növelik a műtĂ©ti rizikĂłt. A COPD, alvási apnoe, szĂvelĂ©gtelensĂ©g, ischaemiás
szĂvbetegsĂ©g, obesitas Ă©s lesoványodás befolyásolják a műtĂ©t kimenetelĂ©t. A
dohányzásrĂłl leszoktatás csökkenheti a posztoperatĂv szövĹ‘dmĂ©nyeket. A
kontrollált légzési technikák, a mellkasmobilizáció és a tréningprogramok
kedvezĹ‘ hatásĂşak, mindez kiegĂ©szĂthetĹ‘ pszichoszociális Ă©s dietetikai
támogatással. KövetkeztetĂ©sek: A rizikĂłbecslĂ©st segĂtĹ‘
szempontrendszer tartalmazza a légzésfunkció, oxigénfelvétel, laborparaméterek
és társbetegségek vizsgálatát. A légzésrehabilitáció kedvező funkcionális
hatásĂş, javĂtva az Ă©letminĹ‘sĂ©get. Orv Hetil. 2017; 158(50): 1989–1997.
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Abstract:
Introduction: Besides the oncology and operative surgical
technics, functional aspects influence the operability of lung cancer.
Preoperative risk stratification, evaluation of postoperative complications
needs to be considered. Aim: To review international literature
and experiences of our institute. Method: We focused the
literature of risk stratification of thoracic surgery. Lung function, lung
mechanics, chest kinematics, exercise physiology were considered. Effectiveness
of pulmonary rehabilitation for cardiovascular system, lung mechanics, muscles,
exercise capacity and quality of life were evaluated. Laboratory parameters,
comorbidities, obesity, cachexia, smoking cessation were considered.
Results: Elevated blood sugar, kidney function, reduced
albumin level increased the risk. COPD, sleep apnoea, heart failure, obesity and
cachexia influences the outcome. Smoking cessation may reduce postoperative
complications. Controlled breathing technics, chest wall mobilization, training
have favourable effects. Psychosocial support and dietetics are important.
Conclusions: Risk stratification is supported by laboratory
parameters, lung function, oxygen uptake and comorbidities. Pulmonary
rehabilitation can improve functionality and quality of life. Orv Hetil. 2017;
158(50): 1989–1997
Pulmonary vascular remodeling and right ventricular adaptation in precapillary pulmonary hypertension
Background: In precapillary pulmonary hypertension (PH) as pulmonary arterial hypertension (PAH), chronic thromboembolic PH (CTPEH) and PH due to hypoxia and lung disease (HPH) the different pathomechanisms of vascular remodeling result in different right ventricular (RV) adaptation. Routine clinical factors which could predict vascular remodeling are lacking. Purpose: Our aim was to investigate the differences in parameters of pulmonary vascular remodeling and RV adaptation in subgroups of precapillary PH and to correlate the severity of PH with these parameters. Methods: Fifty-one patients (age 57±15 years) with precapillary PH (PAH N=18, CTEPH N=15, HPH N=18;) underwent right heart catheterization (RHC) and results of RHC, echocardiography and laboratory tests were analyzed retrospectively. Results: The majority of parameters did not show difference among PH groups, but diastolic PAP was higher in PAH than in CTEPH and HPH (p<0.05) and RV outflow tract velocity time integral (RVOT VTI) and RV stroke work index were increased in PAH compared to HPH (p<0.05). Pulmonary vascular resistance (PVR) showed a significant relation to pulmonary arterial compliance (PAC) in the total cohort (p<0.05, r=–0.661) and in all subgroups (PAH p<0.05, r=–0.70; CTEPH p<0.05, r=–0.525; HPH p<0.05, r=–0.793). In PAH, all parameters including RVOT VTI and acceleration time (AT), tricuspid annular plane systolic excursion, RV diameter and right atrial area showed correlations with PVR. In the HPH group, only RVOT AT had a correlation with PVR, but no parameters in the CTEPH group showed a relationship to other factors. Conclusion: In precapillary PH the different degree of RV adaptation in the subgroups is shown by RVSWI as an invasive parameter. The severity of PH is related to PAC in precapillary PH. Some parameters can better characterize the severity of vascular and cardiac changes in PAH than in CTEPH or HPH
Doege–Potter-szindróma a mellhártya óriás malignus szoliter fibrosus tumorával = Doege–Potter syndrome with giant malignant solitary fibrous tumour of the pleura
Absztrakt:
A mellhártya ritkának számĂtĂł szoliter fibrosus tumora nĂ©hány százalĂ©kban
hypoglykaemiával társul, amit elsĹ‘ kĂ©t leĂrĂłjukrĂłl Doege–Potter-szindrĂłmának
neveztek el. Hatvanhárom éves férfi betegünk egy évvel korábban már
pulmonológiai kezelés alatt állt bal oldali mellüregi folyadékgyülemmel, bal
alsó lebenyi daganat CT-képével. Ismét fokozódó terhelési dyspnoe miatt végzett
újabb vizsgálatok során a most már óriásira nőtt tumor vastagtű-biopsziája low
grade sarkomát igazolt. OnkolĂłgiai konzĂlium műtĂ©ti elbĂrálás mĂ©rlegelĂ©sĂ©t
javasolta. A beteg nyugalmi dyspnoe és ismétlődő hypoglykaemiás rosszullétek
miatt gyorsan romlĂł állapotban az intenzĂv osztályrĂłl kerĂĽlt a műtĹ‘be. A tumor
eltávolĂtása Ă©s bal oldali pneumonectomia törtĂ©nt szövĹ‘dmĂ©nymentes gyĂłgyulással.
A szövettan szoliter fibrosus pleuratumort igazolt a Doege–Potter-szindrómának
megfelelően. A műtét alatt észlelt pleuralis szóródás miatt adjuváns
kemoterápiában részesült. Egy évvel a műtét után helyileg kiújult tumort
távolĂtottunk el. A folytatĂłdĂł kemoterápia ellenĂ©re lokális Ă©s ellenoldali
pulmonalis progressziĂłt Ă©szleltĂĽnk. A beteg elsĹ‘ műtĂ©tjĂ©tĹ‘l számĂtott tĂşlĂ©lĂ©se
három év. Orv Hetil. 2018; 159(4): 149–153.
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Abstract:
Infrequent solitary fibrous tumours of the pleura are associated with
hypoglycaemia only in a few percent of the cases; this condition is called
Doege–Potter syndrome, named after its first descriptors. Our 63 years old male
patient has previously undergone clinical treatment for intrathoracic fluid
accumulation on the left side caused by a giant tumour-like mass in the lower
left lobe detected by CT scan. In the course of further investigations performed
due to increasing load-induced dyspnoea, lung core biopsy verified low grade
sarcoma in the tumour. Tumour board suggested surgery. The patient was
transferred from the intensive care unit into the operation theater due to
increasing dyspnoea and repeated hypoglycaemic periods in rapidly worsening
general condition. Pneumonectomy and removal of the tumour was performed on the
left side. Histology showed solitary fibrous tumour of the pleura corresponding
to Doege–Potter syndrome. The patient was discharged without complications and
underwent adjuvant chemotherapy due to pleural dissemination of the tumour
observed intraoperatively. One year after surgery the patient underwent surgical
removal of a locally recurrent tumour. In spite of repeated chemotherapy local
and multiplex contralateral pulmonary progression was observed. Three-year
survival was noted from the time of the first surgery. Orv Hetil. 2018; 159(41):
149–153
Synthesis of isoindole and benzoisoindole derivatives of teicoplanin pseudoaglycon with remarkable antibacterial and antiviral activities
The primary amino function of teicoplanin pseudoaglycon has been transformed into arylthioisoindole or benzoisoindole and glycosylthioisoindole derivatives, in a reaction with o-phthalaldehyde or naphtalene-2,3-dicarbaldehyde and various thiols. All of the obtained semisynthetic antibiotics exhibited potent antibacterial activities against Gram-positive bacteria in the ng per ml concentration range. A few of them showed antiviral activity, in particular against influenza virus.status: publishe