LIVIVO - Search results -

Search results

Result 1 - 10 of total 53

Search options

Article ; Online: Structure-property relationship in new photo-cured dimethacrylate-based dental resins.

Podgórski, Maciej

Dental materials : official publication of the Academy of Dental Materials

2012 Volume 28, Issue 4, Page(s) 398–409

Abstract: Objectives: In this study five novel dimethacrylates of different chain lengths having rigid aromatic rings were synthesized and proposed as possible dental monomers for dental resin mixtures.: Methods: Four monomers were prepared by the reaction of ... ...

Abstract	Objectives: In this study five novel dimethacrylates of different chain lengths having rigid aromatic rings were synthesized and proposed as possible dental monomers for dental resin mixtures. Methods: Four monomers were prepared by the reaction of glycidyl methacrylate with dicarboxylic acid esters obtained from phthalic anhydride and 1,3-propylene, 1,4-butylene, 1,5-penthylene and 1,6-hexylene glycols. The addition reaction of glycidyl methacrylate and the acidic compound was carried out in the presence of tetraethylammonium bromide. The fifth monomer was obtained from 1,5-penthylene glycol-based dimethacrylate by blocking its hydroxyl groups with acetyl groups. The monomers were photo-copolymerized with triethyleneglycol dimethacrylate (TEGDMA) in the presence of a photoinitiator which was 2,2-dimethoxy-2-phenyloacetophenone. Unfilled polymers were evaluated for photopolymerization conversion and volumetric curing shrinkage. Water sorption, water solubility, flexural strength and hardness were measured. The prepared polymers were also subjected to dynamic mechanical studies (DMA). Results: Results show that, increasing the distance between double bonds decreases flexural modulus and hardness. As expected, the curing shrinkage increased with increasing degree of conversion. The acetylation of hydroxyl groups resulted in improved water uptake properties of the compositions. It was demonstrated that, depending upon the content of acetyl groups in the network, the glass transition temperature may be significantly lowered. In polymers with large amounts of pendant groups, β relaxation overlaps with α relaxation (glass transition temperature), and it is the former that discloses the maximum on the tanδ curve. Significance: The systematic change in the length of the new dimethacrylates provided insight into the effects on the resultant material properties. It was shown in the article that the properties of the new monomers compare favorably with properties of the commercially available resins.
MeSH term(s)	Absorption ; Acrylic Resins/chemistry ; Butylene Glycols ; Dental Stress Analysis ; Dicarboxylic Acids ; Elastic Modulus ; Epoxy Compounds ; Glycols ; Hardness ; Hydroxyl Radical ; Light-Curing of Dental Adhesives ; Materials Testing ; Methacrylates/chemical synthesis ; Methacrylates/chemistry ; Molecular Structure ; Phthalic Acids ; Pliability ; Polyethylene Glycols ; Polymerization ; Propylene Glycol ; Solubility ; Structure-Activity Relationship ; Transition Temperature ; Viscosity ; Water
Chemical Substances	Acrylic Resins ; Butylene Glycols ; Dicarboxylic Acids ; Epoxy Compounds ; Glycols ; Methacrylates ; Phthalic Acids ; Water (059QF0KO0R) ; Polyethylene Glycols (30IQX730WE) ; Hydroxyl Radical (3352-57-6) ; Propylene Glycol (6DC9Q167V3) ; hexylene glycol (KEH0A3F75J) ; glycidyl methacrylate (R8WN29J8VF)
Language	English
Publishing date	2012-04
Publishing country	England
Document type	Comparative Study ; Journal Article
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2011.11.013
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

In stock of ZB MED Cologne/Königswinter

Zs.A 2039: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Details ▾

Article: Spatial and Temporal Control of Photomediated Disulfide–Ene and Thiol–Ene Chemistries for Two-Stage Polymerizations

Soars, Shafer M. / Bongiardina, Nicholas J. / Fairbanks, Benjamin D. / Podgórski, Maciej / Bowman, Christopher N.

Macromolecules. 2022 Feb. 14, v. 55, no. 5

2022

Abstract: A new strategy is reported for the design and synthesis of high sulfur-containing materials for potential use in covalent adaptable networks and optical materials by combining photomediated thiol–ene- and disulfide–ene-based polymerization reactions. ... ...

Abstract	A new strategy is reported for the design and synthesis of high sulfur-containing materials for potential use in covalent adaptable networks and optical materials by combining photomediated thiol–ene- and disulfide–ene-based polymerization reactions. Taking advantage of the relative reaction rates to differentiate sequentially between the thiol–ene and disulfide–ene conjugations, these reactions were performed semiorthogonally to produce polymer networks of controlled architecture. Kinetic analysis demonstrates that the thiol–ene reaction is approximately 30 times faster than the disulfide–ene reaction, enabling spatial and temporal manipulation of material properties via dual-cure networks and photopatterning. A two-stage polymerization approach was implemented with increases in modulus in the second stage of 2–3 orders of magnitude accompanied by increases in the glass-transition temperature of more than 15 °C. Additionally, the thiol–ene reaction in the presence of a disulfide yields materials capable of simultaneous network development and stress relaxation through dynamic bond exchange during in situ polymerization.
Keywords	disulfides ; glass transition temperature ; kinetics ; polymerization ; polymers ; stress relaxation
Language	English
Dates of publication	2022-0214
Size	p. 1811-1821.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1491942-4
ISSN	1520-5835 ; 0024-9297
ISSN (online)	1520-5835
ISSN	0024-9297
DOI	10.1021/acs.macromol.1c02464
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Cross-Linked Polythiomethacrylate Esters Based on Naphthalene-Synthesis, Properties and Reprocessing.

Fila, Karolina / Podkościelna, Beata / Podgórski, Maciej

Materials (Basel, Switzerland)

2020 Volume 13, Issue 13

Abstract: Two structurally different aromatic dithioesters were synthesized from two dithiols and methacryloyl chloride. The polymer networks based on methyl methacrylate and/or styrene and the new dimethacrylates were subsequently prepared. The polymerization ... ...

Abstract	Two structurally different aromatic dithioesters were synthesized from two dithiols and methacryloyl chloride. The polymer networks based on methyl methacrylate and/or styrene and the new dimethacrylates were subsequently prepared. The polymerization yields of copolymers were in the range of 95-99%. The thermal and mechanical properties of the copolymers were determined by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TG/DTG), and Shore D hardness. The addition of dithioesters-1,5-NAF-S-Met (or 1,4(1,5)-NAF-CH
Language	English
Publishing date	2020-07-06
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma13133021
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Additive Manufacture of Dynamic Thiol-ene Networks Incorporating Anhydride-Derived Reversible Thioester Links.

Podgórski, Maciej / Huang, Sijia / Bowman, Christopher N

ACS applied materials & interfaces

2020 Volume 13, Issue 11, Page(s) 12789–12796

Abstract: A photoprintable dynamic thiol-ene resin was developed based on commercially available anhydride, thiol, and ene monomers. The dynamic chemistry chosen for this study relied on the thermal reversibility of the in situ generated thioester-anhydride links. ...

Abstract	A photoprintable dynamic thiol-ene resin was developed based on commercially available anhydride, thiol, and ene monomers. The dynamic chemistry chosen for this study relied on the thermal reversibility of the in situ generated thioester-anhydride links. The resin's rheological and curing properties were optimized to enable 3D printing using the masked stereolithography (MSLA) technique. To achieve a desirable depth of cure of 200 μm, a combination of radical photoinitiator (BAPO) and inhibitor (pyrogallol) were used at a weight ratio of 0.5 to 0.05, resulting in more than 90% thiol-ene conversion within 12 s curing time. In a series of stress relaxation and creep experiments, the dynamic reversible exchange was characterized and yielded rapid exchange rates ranging from minutes to seconds at temperatures of 80-140 °C. Little to no exchange was observed at temperatures below 60 °C. Various 3D geometries were 3D printed, and the printed objects were shown to be reconfigurable above 80 °C and depolymerizable at or above 120 °C. By deactivation of the exchange catalyst (DMAP), the stimuli responsiveness was demonstrated to be erasable, allowing for a significant shift in the actuation threshold. These highly enabling features of the dynamic chemistry open up new possibilities in the field of shape memory and 4D printable functional materials.
Language	English
Publishing date	2020-12-23
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.0c18979
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Synthesis and characterization of acetyloxypropylene dimethacrylate as a new dental monomer.

Podgórski, Maciej

Dental materials : official publication of the Academy of Dental Materials

2011 Volume 27, Issue 8, Page(s) 748–754

Abstract: Objective: In this study acetyloxypropylene dimethacrylate was synthesized and proposed as an alternative monomer for triethyleneglycol dimethacrylate (TEGDMA) in dental mixtures.: Methods: The monomer was prepared by the reaction of glycerol ... ...

Abstract	Objective: In this study acetyloxypropylene dimethacrylate was synthesized and proposed as an alternative monomer for triethyleneglycol dimethacrylate (TEGDMA) in dental mixtures. Methods: The monomer was prepared by the reaction of glycerol dimethacrylate with acetic anhydride. The exchange reaction was carried out in the presence of catalytic amounts of sulfuric acid. After purification the monomer was mixed with 2,2-dimethoxy-2-phenyloacetophenone and photo-irradiated. Unfilled homopolymer was evaluated for photopolymerization conversion and volumetric curing shrinkage. Water sorption, water solubility, flexural strength and hardness were measured. Also, dynamic mechanical studies were performed. For comparison TEGDMA was homopolymerized and its properties were evaluated. Results: The proposed dimethacrylate has viscosity comparable to TEGDMA, lower curing shrinkage and lower degree of double bond conversion. After homopolymerization, its water sorption is much lower than that of homopolymerized TEGDMA. Concerning the mechanical properties, the homopolymerized acetyloxypropylene dimethacrylate has higher modulus and hardness than analogically cured TEGDMA. Significance: New dimethacrylate is a promising photocurable dental diluent owing to its low viscosity, good mechanical and water uptake properties.
MeSH term(s)	Absorption ; Acetic Anhydrides/chemistry ; Acetophenones/chemistry ; Adsorption ; Dental Materials/chemical synthesis ; Dental Materials/chemistry ; Elastic Modulus ; Glycerol/chemistry ; Hardness ; Humans ; Methacrylates/chemical synthesis ; Methacrylates/chemistry ; Molecular Weight ; Photochemical Processes ; Pliability ; Polyethylene Glycols/chemistry ; Polymerization ; Polymethacrylic Acids/chemistry ; Refractometry ; Solubility ; Sulfuric Acids/chemistry ; Surface Properties ; Transition Temperature ; Viscosity ; Water/chemistry
Chemical Substances	Acetic Anhydrides ; Acetophenones ; Dental Materials ; Methacrylates ; Polymethacrylic Acids ; Sulfuric Acids ; acetyloxypropylene dimethacrylate ; Water (059QF0KO0R) ; triethylene glycol dimethacrylate (14I47YJ5EY) ; 2,2-dimethoxy-2-phenylacetophenone (1DK0094V28) ; acetic anhydride (2E48G1QI9Q) ; Polyethylene Glycols (30IQX730WE) ; sulfuric acid (O40UQP6WCF) ; Glycerol (PDC6A3C0OX)
Language	English
Publishing date	2011-08
Publishing country	England
Document type	Comparative Study ; Journal Article
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2011.03.014
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

In stock of ZB MED Cologne/Königswinter

Zs.A 2039: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

Order via subito

Details ▾

Article ; Online: Shape Permanence in Diarylethene-Functionalized Liquid-Crystal Elastomers Facilitated by Thiol-Anhydride Dynamic Chemistry.

Hebner, Tayler S / Podgórski, Maciej / Mavila, Sudheendran / White, Timothy J / Bowman, Christopher N

Angewandte Chemie (International ed. in English)

2022 Volume 61, Issue 11, Page(s) e202116522

Abstract: Diarylethene-functionalized liquid-crystalline elastomers (DAE-LCEs) containing thiol-anhydride bonds were prepared and shown to undergo reversible, reprogrammable photoinduced actuation. Upon exposure to UV light, a monodomain DAE-LCE generated 5.5 % ... ...

Abstract	Diarylethene-functionalized liquid-crystalline elastomers (DAE-LCEs) containing thiol-anhydride bonds were prepared and shown to undergo reversible, reprogrammable photoinduced actuation. Upon exposure to UV light, a monodomain DAE-LCE generated 5.5 % strain. This photogenerated strain was demonstrated to be optically reversible over five cycles of alternating UV/Visible light exposure with minimal photochrome fatigue. The incorporation of thiol-anhydride dynamic bonds allowed for retention of actuated states. Further, re-programming of the nematic director was achieved by heating above the temperature for bond exchange to occur (70 °C) yet below the nematic-to-isotropic transition temperature (100 °C) such that order was maintained between mesogens. The observed thermal stability of each of the diarylethene isomers of over 72 h allowed for decoupling of photo-induced processes and polymer network effects, showing that both polymer relaxation and back-isomerization of the diarylethene contributed to LCE relaxation over a period of 12 hours after actuation unless bond exchange occurred.
Language	English
Publishing date	2022-01-25
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2011836-3
ISSN	1521-3773 ; 1433-7851
ISSN (online)	1521-3773
ISSN	1433-7851
DOI	10.1002/anie.202116522
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

Order via subito

Details ▾
- Full text online
- Order with fees

Article ; Online: Synthesis and characterization of novel dimethacrylates of different chain lengths as possible dental resins.

Podgórski, Maciej

Dental materials : official publication of the Academy of Dental Materials

2010 Volume 26, Issue 6, Page(s) e188–94

Abstract: Objective: In this study three novel dimethacrylates of different chain lengths having bulky bicycloaliphatic rings were synthesized and proposed as possible dental monomers for dental resin mixtures.: Methods: The monomers were prepared by the ... ...

Abstract	Objective: In this study three novel dimethacrylates of different chain lengths having bulky bicycloaliphatic rings were synthesized and proposed as possible dental monomers for dental resin mixtures. Methods: The monomers were prepared by the reaction of glycidyl methacrylate with dicarboxylic acid esters obtained from nadic anhydride and ethylene, 1,4-butylene and 1,6-hexylene glycols. The addition reaction of glycidyl methacrylate and the acidic compound was carried out in the presence of basic catalyst-tetraethylammonium bromide. The monomers were photopolymerized in the presence of a photoinitiator which was 2,2-dimethoxy-2-phenyloacetophenone. Unfilled homopolymers were evaluated for photopolymerization conversion and volumetric curing shrinkage. Water sorption, water solubility, flexural strength and hardness were measured. The prepared polymers were also subjected to dynamic mechanical studies (DMA). Results: The proposed dimethacrylates exhibit low curing shrinkage (about 4-5%) and high degree of double bond conversion (up to 84%). Their water sorption and water solubility are comparable to those of Bis-GMA composite resin. Furthermore, their thermo-mechanical properties are better than those of the commonly known dimethacrylates. Significance: The new dimethacrylates are promising photocurable dental monomers owning to simple synthesis, high degree of conversion coupled with low curing shrinkage and good mechanical properties.
MeSH term(s)	Absorption ; Acetophenones/chemistry ; Adsorption ; Bisphenol A-Glycidyl Methacrylate/chemistry ; Butylene Glycols/chemistry ; Composite Resins/chemistry ; Dental Materials/chemical synthesis ; Dental Materials/chemistry ; Dicarboxylic Acids/chemistry ; Epoxy Compounds/chemistry ; Ethylenes/chemistry ; Glycols/chemistry ; Hardness ; Humans ; Materials Testing ; Methacrylates/chemical synthesis ; Methacrylates/chemistry ; Photochemical Processes ; Pliability ; Polyethylene Glycols/chemistry ; Polymers/chemical synthesis ; Polymers/chemistry ; Polymethacrylic Acids/chemistry ; Polyurethanes/chemistry ; Refractometry ; Resins, Synthetic/chemical synthesis ; Resins, Synthetic/chemistry ; Solubility ; Stress, Mechanical ; Surface Properties ; Tetraethylammonium/chemistry ; Transition Temperature ; Viscosity ; Water/chemistry
Chemical Substances	Acetophenones ; Butylene Glycols ; Composite Resins ; Dental Materials ; Dicarboxylic Acids ; Epoxy Compounds ; Ethylenes ; Glycols ; Methacrylates ; Polymers ; Polymethacrylic Acids ; Polyurethanes ; Resins, Synthetic ; Water (059QF0KO0R) ; urethane dimethacrylate luting resin (125523-74-2) ; triethylene glycol dimethacrylate (14I47YJ5EY) ; 2,2-dimethoxy-2-phenylacetophenone (1DK0094V28) ; Polyethylene Glycols (30IQX730WE) ; Bisphenol A-Glycidyl Methacrylate (454I75YXY0) ; Tetraethylammonium (66-40-0) ; 1,4-butanediol (7XOO2LE6G3) ; ethylene (91GW059KN7) ; glycidyl methacrylate (R8WN29J8VF) ; hexamethylene glycol (ZIA319275I)
Language	English
Publishing date	2010-06
Publishing country	England
Document type	Comparative Study ; Journal Article
ZDB-ID	605995-8
ISSN	1879-0097 ; 0109-5641
ISSN (online)	1879-0097
ISSN	0109-5641
DOI	10.1016/j.dental.2010.02.011
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

In stock of ZB MED Cologne/Königswinter

Zs.A 2039: Show issues

Location:
Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

Order via subito

Details ▾

Article: Substituted Thiols in Dynamic Thiol–Thioester Reactions

Bongiardina, Nicholas J. / Long, Katelyn F. / Podgórski, Maciej / Bowman, Christopher N.

Macromolecules. 2021 Sept. 08, v. 54, no. 18

2021

Abstract: The thiol–thioester reaction has emerged as a promising method for developing covalent adaptable networks (CANs) due to its ability to exchange rapidly under low temperature conditions in a number of solvents, orthogonality among other functional groups, ...

Abstract	The thiol–thioester reaction has emerged as a promising method for developing covalent adaptable networks (CANs) due to its ability to exchange rapidly under low temperature conditions in a number of solvents, orthogonality among other functional groups, and tunability. Here, the effects of thiol substitution (i.e., primary vs secondary) were assessed with respect to their reactivity in two dynamic thioester reactions: the thiol–thioester exchange and the reversible thiol–anhydride addition. Model NMR experiments were conducted using small-molecule compounds to observe how polymers of similar components would behave in thiol–thioester exchange. It was determined that the Kₑq was near unity for mixtures of primary thiols and secondary thioesters, and vice versa, in both a polar solvent, DMSO-d₆, and at most slightly favors primary thioesters in a relatively nonpolar solvent, CDCl₃. Dielectric spectroscopy and stress relaxation experiments were used to determine the relaxation times and activation energies of the two thioester-containing networks: Thiol-ene networks, which undergo thioester exchange, displayed activation energies of 73 and 71 kJ/mol from dielectric measurements and 36 and 53 kJ/mol from stress relaxation for the primary and secondary thiols, respectively. Thiol–anhydride-ene networks, which undergo both thioester exchange and reversible thiol–anhydride addition, displayed activation energies of 94 and 114 kJ/mol from dielectric and 111 and 139 kJ/mol from stress relaxation for primary and secondary thiols, respectively. In both types of networks, the secondary thioester-based networks demonstrated slower dynamics as compared to the same primary network by at least one order of magnitude. In the anhydride network, the secondary thiol also biased the dynamics toward reversible addition.
Keywords	anhydrides ; dielectric spectroscopy ; solvents ; stress relaxation ; temperature ; thioesters ; thiols
Language	English
Dates of publication	2021-0908
Size	p. 8341-8351.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1491942-4
ISSN	1520-5835 ; 0024-9297
ISSN (online)	1520-5835
ISSN	0024-9297
DOI	10.1021/acs.macromol.1c00649
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Manipulating the Relative Rates of Reaction and Diffusion in a Holographic Photopolymer Based on Thiol–Ene Chemistry

Hu, Yunfeng / Mavila, Sudheendran / Podgórski, Maciej / Kowalski, Jamie E. / McLeod, Robert R. / Bowman, Christopher N.

Macromolecules. 2022 Feb. 22, v. 55, no. 5

2022

Abstract: Properly balanced reaction and diffusion kinetics are crucial for achieving optimal performance in holographic photopolymers. However, a comprehensive study on the effect of reaction and diffusion on the performance of thiol–ene-based holographic ... ...

Abstract	Properly balanced reaction and diffusion kinetics are crucial for achieving optimal performance in holographic photopolymers. However, a comprehensive study on the effect of reaction and diffusion on the performance of thiol–ene-based holographic photopolymers has not been performed previously. To determine the relationship between reaction and diffusion, the refractive index modulation (Δn) of holographic gratings recorded in a model thiol–ene photopolymer system was evaluated with controlling the rates of reaction and diffusion processes. By changing the molecular weight of the polymer binder, the diffusion rate was varied over orders of magnitudes with the highest Δn of 0.026 achieved at a molecular weight of 2.9 × 10⁴ Da. Meanwhile, the haze was significantly reduced in binders of higher molecular weight. Similarly, as the reaction rate was reduced in accordance with lowering the light intensity, the Δn reached a peak value of 0.023 at 7 mW/cm² and was found to decrease at both higher (2500 lines/mm) and lower (1000 lines/mm) spatial frequencies. In particular, Δn approaching 0 was observed at a very low intensity (2 mW/cm²) and when the binder with a molecular weight as low as 0.5 × 10⁴ Da was used. An analogous formulation incorporating a secondary thiol, which has slower reaction kinetics and a more stable thiyl radical relative to the primary thiol, exhibited a lower Δn , especially at higher spatial frequencies. Through one-step thiol-Michael addition, the functionality of a tetrathiol monomer was reduced to various extents to obtain a series of thiol–ene photopolymers with precise control over gel point conversions, among which the thiol with an average functionality of 3.5 realized the highest Δn of 0.028. An enhanced reactive binder with norbornene pendant groups was also synthesized, and holographic gratings recorded in it showed notably higher Δn at low light intensities compared to those recorded in non-reactive or less reactive binders.
Keywords	gels ; light intensity ; molecular weight ; polymers ; reaction kinetics ; refractive index ; thiols
Language	English
Dates of publication	2022-0222
Size	p. 1822-1833.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1491942-4
ISSN	1520-5835 ; 0024-9297
ISSN (online)	1520-5835
ISSN	0024-9297
DOI	10.1021/acs.macromol.1c02528
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Obstructive Sleep Apnea as a Predictor of Arrhythmias in 24-h ECG Holter Monitoring.

Urbanik, Dominika / Gać, Paweł / Martynowicz, Helena / Podgórski, Maciej / Poręba, Małgorzata / Mazur, Grzegorz / Poręba, Rafał

Brain sciences

2021 Volume 11, Issue 4

Abstract: A relationship between obstructive sleep apnea (OSA) and abnormalities in 24-h electrocardiogram (ECG) Holter monitoring has not been sufficiently documented. The aim of this study was to analyze the relation between the occurrence and the severity of ... ...

Abstract	A relationship between obstructive sleep apnea (OSA) and abnormalities in 24-h electrocardiogram (ECG) Holter monitoring has not been sufficiently documented. The aim of this study was to analyze the relation between the occurrence and the severity of OSA and the parameters of ECG Holter monitoring in a group of patients with diagnosed OSA. Ninety-four patients with clinical suspicion of OSA were qualified for the study (mean age 53.7). All participants underwent a medical history, laboratory tests, 24-h ECG Holter monitoring, and single-night video-polysomnography (vPSG) using the American Academy of Sleep Medicine recommendations. A group of patients with diagnosed OSA was characterized by more frequent occurrence of supraventricular tachycardia (SVT) and ventricular arrhythmias (VPC). A statistically significant positive correlation was shown between the apnea-hypopnea index (AHI) and average heart rate, supraventricular arrhythmias (SVPC) pairs, SVT, and pauses >2.5 s. In regression analysis, higher AHI constituted an independent predicator for the increased number of pauses >2.5 s, SVT, and SVPC pairs in 24-h ECG Holter monitoring. In summary, patients with OSA are characterized by the increased number of abnormalities in 24-h ECG Holter monitoring.
Language	English
Publishing date	2021-04-12
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2651993-8
ISSN	2076-3425
ISSN	2076-3425
DOI	10.3390/brainsci11040486
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

To top

Full text online

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito

Full text online

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito