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Journal articles on the topic 'PentaRay'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Teixeira, Pedro Pinto, Pedro Silva Cunha, Ana Sofia Delgado, Ricardo Pimenta, Mário Martins Oliveira, and Rui Cruz Ferreira. "PentaRay catheter in persistent atrial fibrillation ablation." Revista Portuguesa de Cardiologia (English Edition) 35, no. 2 (February 2016): 121–23. http://dx.doi.org/10.1016/j.repce.2016.01.002.

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2

Thomas, Vincent C., and Qun Sha. "Pentaray contraindicated for use with mechanical valves." EP Europace 22, no. 9 (July 13, 2020): 1444–45. http://dx.doi.org/10.1093/europace/euaa112.

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3

Pinto Teixeira, Pedro, Pedro Silva Cunha, Ana Sofia Delgado, Ricardo Pimenta, Mário Martins Oliveira, and Rui Cruz Ferreira. "Cateter PentaRay na ablação de fibrilhação auricular persistente." Revista Portuguesa de Cardiologia 35, no. 2 (February 2016): 121–23. http://dx.doi.org/10.1016/j.repc.2015.09.014.

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4

Kawaji, Tetsuma, Masashi Kato, and Takafumi Yokomatsu. "Pentaray contraindicated for use with mechanical valves: Authors’ reply." EP Europace 22, no. 9 (July 13, 2020): 1445. http://dx.doi.org/10.1093/europace/euaa113.

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5

Maagh, Petra, Arnd Christoph, Henning Dopp, Markus Sebastian Mueller, Gunnar Plehn, and Axel Meissner. "High-Density Mapping in Ventricular Tachycardia Ablation: A PentaRay® Study." Cardiology Research 8, no. 6 (2017): 293–303. http://dx.doi.org/10.14740/cr636w.

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6

Ho, Reginald T., Daniel R. Frisch, and Arnold J. Greenspon. "Idiopathic Ventricular Fibrillation Ablation Facilitated by PENTARAY Mapping of the Moderator Band." JACC: Clinical Electrophysiology 3, no. 3 (March 2017): 313–14. http://dx.doi.org/10.1016/j.jacep.2016.08.006.

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7

Sheldon, Seth H., and Eric Good. "PentaRay entrapment in a mechanical mitral valve during catheter ablation of atrial fibrillation." HeartRhythm Case Reports 2, no. 2 (March 2016): 200–201. http://dx.doi.org/10.1016/j.hrcr.2015.11.006.

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8

Furuya, Takahiro. "Left atrial volume and voltage in patients with atrial fibrillation assessed by PentaRay catheter." Journal of Electrocardiology 53 (March 2019): e17. http://dx.doi.org/10.1016/j.jelectrocard.2019.01.060.

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9

Furuya, Takahiro. "Left atrial volume and voltage in patients with atrial fibrillation assessed by PentaRay catheter." Journal of Electrocardiology 51, no. 6 (November 2018): 1178. http://dx.doi.org/10.1016/j.jelectrocard.2018.10.060.

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10

Tatar, M., E. Tuna, A. Şentürk, CG Turgut, G. Erdoğan, G. Sezginer, and E. Akkurt. "Cost Effectiveness Of Pentaray High Density Mapping Catheter In Treatment Of Ventricular Tachycardia In Turkey." Value in Health 20, no. 9 (October 2017): A584. http://dx.doi.org/10.1016/j.jval.2017.08.1054.

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11

Lopes, João, Pedro A. Sousa, Luís Elvas, and Lino Gonçalves. "Successful retrieval of a broken PentaRay catheter spine in a patient with mechanic mitral valve prosthesis." Journal of Interventional Cardiac Electrophysiology 61, no. 3 (February 27, 2021): 625–26. http://dx.doi.org/10.1007/s10840-021-00965-5.

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12

Yagishita, Atsuhiko, Kengo Ayabe, Susumu Sakama, Masahiro Morise, Mari Amino, Yuji Ikari, and Koichiro Yoshioka. "A Novel Technique to Release a PentaRay Entrapped in a Mechanical Mitral Valve Using an Ablation Catheter." JACC: Clinical Electrophysiology 6, no. 12 (November 2020): 1597–98. http://dx.doi.org/10.1016/j.jacep.2020.08.017.

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13

Lemes, Christine, Erik Wissner, Sebastian Deiß, Michail Chmelevsky, Alexey Tsyganov, Tilmann Maurer, Ardan Saguner, Mathew Shibu, Karl-Heinz Kuck, and Andreas Metzner. "209-03: Noninvasive Phase Mapping of Atrial Fibrillation in Humans: Comparison with Invasive Mapping by PentaRay Nav Catheters." EP Europace 18, suppl_1 (June 2016): i140. http://dx.doi.org/10.1093/europace/18.suppl_1.i140b.

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14

Haanschoten, Danielle M., Ahmet Adiyaman, Jaap Jan J. Smit, Peter Paul H. M. Delnoy, Anand R. Ramdat Misier, Fabiano Porta, Robert P. H. Storm van Leeuwen, and Arif Elvan. "Hybrid Ventricular Tachycardia Ablation after Failed Percutaneous Endocardial and Epicardial Ablation." Cardiology 145, no. 2 (November 8, 2019): 88–94. http://dx.doi.org/10.1159/000503251.

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Introduction: Recurrent ventricular tachycardia (VT) after percutaneous ablation is associated with a high morbidity and mortality. We assessed the feasibility of open chest extracorporeal circulation (ECC)-supported 3D multielectrode mapping and targeted VT substrate ablation in patients with previously failed percutaneous endocardial and epicardial VT ablations. Methods: In patients with previously failed percutaneous endocardial and epicardial VT ablations and a high risk of hemodynamic collapse during the procedure, open chest ECC-supported mapping and ablation were performed in a hybrid EP lab setting. Electro-anatomic maps (3D) were acquired during sinus rhythm and VT using a multielectrode mapping catheter (HD grid; Abbott or Pentaray, Biosense Webster). Irrigated radiofrequency ablations of all inducible VT were performed with a contact force ablation catheter. Results: Hybrid VT ablation was performed in 5 patients with structural heart disease (i.e., 3 with previous old myocardial infarction and 2 with nonischemic cardiomyopathy) and recurrent VT. Acute procedural success was achieved in all patients. Four patients were successfully weaned off the ECC. In 1 patient with a severely reduced LVEF (16%), damage to the venous graft occurred after sternotomy and that patient died after 1 month. Four patients (80%) remained VT free after a median follow-up of 6 (IQR 4–10) months. Conclusion: In high-risk patients with previously failed percutaneous endocardial and epicardial VT ablations, open chest ECC-supported multielectrode epicardial mapping revealed a VT substrate in all of the patients, and targeted epicardial ablation abolished VT substrate in these patients.

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15

Dibra, Sebhia Marie, and Ulrich Winter. "Pentagram Geometry." JOURNAL OF ADVANCES IN PHYSICS 13, no. 4 (August 1, 2017): 4852–57. http://dx.doi.org/10.24297/jap.v13i5.6051.

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The Natural Constant Phi is included in the geometrical figure of a Pentagram as many artists have found out. Michelangelo may be the most famous one, whose sketch was transported in the payload of the first sucessful mission to the moon. By deriving this natural constant from the geometrics of the Pentagram a new analytical expression is found for Phi.

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16

Akiyama, Jin, and Hyunwoo Seong. "Pentadral Complices." Journal of Information Processing 23, no. 3 (2015): 246–51. http://dx.doi.org/10.2197/ipsjjip.23.246.

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17

Schwartz, Richard Evan. "Pentagram Spirals." Experimental Mathematics 22, no. 4 (October 2, 2013): 384–405. http://dx.doi.org/10.1080/10586458.2013.830582.

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18

Claussen, Denise Wletlispach. "Pentasa (Mesalamine)." Gastroenterology Nursing 16, no. 3 (December 1993): 136–37. http://dx.doi.org/10.1097/00001610-199312000-00010.

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19

Kumar, Sudeshna, Anirban Santara, and Haimanti Banerji. "Pentagram Sustainability Model." International Review for Spatial Planning and Sustainable Development 8, no. 2 (April 15, 2020): 100–117. http://dx.doi.org/10.14246/irspsda.8.2_100.

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20

Holmes, Robert R., Roberta O. Day, and Jeffrey S. Payne. "CYCLIC PENTAOXY SILICONATES1,2." Phosphorus, Sulfur, and Silicon and the Related Elements 42, no. 1-2 (January 1989): 1–13. http://dx.doi.org/10.1080/10426508908054870.

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21

Kiraly, Laszlo, Jana Stange, Kathleen S. Kunert, and Saadettin Sel. "Repeatability and Agreement of Central Corneal Thickness and Keratometry Measurements between Four Different Devices." Journal of Ophthalmology 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6181405.

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Background.To estimate repeatability and comparability of central corneal thickness (CCT) and keratometry measurements obtained by four different devices in healthy eyes.Methods.Fifty-five healthy eyes from 55 volunteers were enrolled in this study. CCT (IOLMaster 700, Pentacam HR, and Cirrus HD-OCT) and keratometry readings (IOLMaster 700, Pentacam HR, and iDesign) were measured. For statistical analysis, the corneal spherocylinder was converted into power vectors (J0, J45). Repeatability was assessed by intraclass correlation coefficient (ICC). Agreement of measurements between the devices was evaluated by the Bland-Altman method.Results.The analysis of repeatability of CCT data of IOLMaster 700, Pentacam HR, and Cirrus HD-OCT showed high ICCs (range 0.995 to 0.999). The comparison of CCT measurements revealed statistically significant differences between Pentacam HR versus IOLMaster 700 (p<0.0001) and Pentacam HR versus Cirrus HD-OCT (p<0.0001), respectively. There was no difference in CCT measurements between IOLMaster 700 and Cirrus HD-OCT (p=0.519). The repeatability of keratometry readings (J0 and J45) of IOLMaster 700, Pentacam HR, and iDesign was also high with ICCs ranging from 0.974 to 0.999. The Pentacam HR revealed significantly higher J0 in comparison to IOLMaster 700 (p=0.009) and iDesign (p=0.041); however, no significant difference was between IOLMaster 700 and iDesign (p=0.426). Comparison of J45 showed no significant difference between IOLMaster 700, Pentacam HR, and iDesign. These results were in accordance with Bland-Altman plots.Conclusion.In clinical practice, the devices analyzed should not be used interchangeably due to low agreement regarding CCT as well as keratometry readings.

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22

Müller-Wirtz, Lukas Martin, Daniel Kiefer, Sven Ruffing, Timo Brausch, Tobias Hüppe, Daniel I. Sessler, Thomas Volk, Tobias Fink, Sascha Kreuer, and Felix Maurer. "Quantification of Volatile Aldehydes Deriving from In Vitro Lipid Peroxidation in the Breath of Ventilated Patients." Molecules 26, no. 11 (May 21, 2021): 3089. http://dx.doi.org/10.3390/molecules26113089.

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Exhaled aliphatic aldehydes were proposed as non-invasive biomarkers to detect increased lipid peroxidation in various diseases. As a prelude to clinical application of the multicapillary column–ion mobility spectrometry for the evaluation of aldehyde exhalation, we, therefore: (1) identified the most abundant volatile aliphatic aldehydes originating from in vitro oxidation of various polyunsaturated fatty acids; (2) evaluated emittance of aldehydes from plastic parts of the breathing circuit; (3) conducted a pilot study for in vivo quantification of exhaled aldehydes in mechanically ventilated patients. Pentanal, hexanal, heptanal, and nonanal were quantifiable in the headspace of oxidizing polyunsaturated fatty acids, with pentanal and hexanal predominating. Plastic parts of the breathing circuit emitted hexanal, octanal, nonanal, and decanal, whereby nonanal and decanal were ubiquitous and pentanal or heptanal not being detected. Only pentanal was quantifiable in breath of mechanically ventilated surgical patients with a mean exhaled concentration of 13 ± 5 ppb. An explorative analysis suggested that pentanal exhalation is associated with mechanical power—a measure for the invasiveness of mechanical ventilation. In conclusion, exhaled pentanal is a promising non-invasive biomarker for lipid peroxidation inducing pathologies, and should be evaluated in future clinical studies, particularly for detection of lung injury.

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23

González-Méijome, Jose M., Daniela Lopes-Ferreira, Laura Rico-del-Viejo, Patrícia Neves, Helena Ferreira, and José Salgado-Borges. "Corneal Pachymetry measured with Pentacam and CorvisST in Normal and Keratoconic Eyes." International Journal of Keratoconus and Ectatic Corneal Diseases 2, no. 3 (2013): 104–7. http://dx.doi.org/10.5005/jp-journals-10025-1061.

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ABSTRACT Purpose To evaluate the agreement of pachymetry data provided by a new instrument to measure intraocular pressure (IOP) and the corneal biomechanical response with the values provided by Pentacam in healthy and keratoconic eyes. Methods Fifty-four right eyes from 54 healthy patients (32 females, 22 males) and 82 eyes from 43 keratoconus patients (20 females, 23 males) were included in the study. All patients were evaluated with Pentacam and CorvisST (Oculus, Wetzlar, Germany) in random order in the same session. CorvisCCT was compared to Pentacam pachymetry in at the corneal center (PentacamCCT) and at the thinnest point (PentacamMinCT). Results Average pachymetry provided by CorvisST was 534 ± 34 microns in the healthy population and 476 ± 56 microns in the population with keratoconus. Pachymetric values obtained with Pentacam were highly correlated between them as well as with the Corvis value in both groups, but the correlation coefficients were higher in the healthy group. Conclusion Corvis pachymetry can be used interchangeably with Pentacam thinnest point pachymetry in healthy corneas. However, in keratoconic corneas, the difference between both parameters will be higher as the disease progresses and increases the difference between Pentacam pachymetry at cornea center and at the thinnest point. How to cite this article González-Méijome JM, Lopes-Ferreira D, Rico-del-Viejo L, Neves P, Ferreira H, Salgado-Borges J. Corneal Pachymetry measured with Pentacam and CorvisST in Normal and Keratoconic Eyes. Int J Kerat Ect Cor Dis 2013;2(3):104-107.

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24

ÖZYOL, Erhan, and Pelin ÖZYOL. "Evaluation of Corneal Parameters in Pseudoexfoliative Syndrome with Pentacam-Scheimpflug." Turkiye Klinikleri Journal of Ophthalmology 26, no. 2 (2017): 102–6. http://dx.doi.org/10.5336/ophthal.2016-52050.

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25

Savini, Giacomo, and Kenneth J. Hoffer. "Pentacam Equivalent K-Reading." Journal of Refractive Surgery 26, no. 6 (June 1, 2010): 388–89. http://dx.doi.org/10.3928/1081597x-20100423-01.

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26

De Bernardo, Maddalena, Maria Borrelli, Roberto Imparato, and Nicola Rosa. "Calculation of the Real Corneal Refractive Power after Photorefractive Keratectomy Using Pentacam, When Only the Preoperative Refractive Error is Known." Journal of Ophthalmology 2020 (April 1, 2020): 1–5. http://dx.doi.org/10.1155/2020/1916369.

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Purpose. To check if a regression formula, IOLMaster-derived, to calculate the real corneal power after photorefractive keratectomy (PRK), can give reliable results utilizing the Pentacam. Methods. Pre- and postoperative IOLMaster, Km, and Pentacam K readings were measured. Patients who had myopic PRK were divided into two groups: the first group (108 eyes) was utilized to check which of the preop Pentacam K readings (P-Kpre) better fitted with the preop IOLMaster measurements; in the second group (120 eyes), the real K (Kr), obtained adding the effective treatment to the P-Kpre, were compared with the K readings calculated with the IOLMaster-derived formula (Kc). Moreover, an attempt to find a different formula utilizing the P-Kpre was made. Results. In group 1, the best correlation was found between IOLMaster Km and Pentacam equivalent K readings (r2 0.9519). In group 2, the comparison between Kr and Pentacam postop Km showed 69 eyes (57%) with differences >0.5 D and 38 eyes (31%) with differences >1 D, (P<0.001). The comparison between Kr and Kc showed 55 eyes (45%) with differences >0.5 D and 22 eyes (18%) with differences >1 D, (P<0.001). Moreover, a regression formula K = EKR − [ETcp + (0.8114 ∗ ETcp − 0.2031)] was obtained in order to calculate the K readings to be used with the Pentacam in the IOL power calculation in case the effective treatment is known. Conclusions. K calculated with the new formula could be used in patients that underwent refractive corneal surgery in case a Pentacam device is used, pending further studies conducted in clinical practice to establish its accuracy and effectiveness. This study further proves that data obtained from different machines cannot be used interchangeably.

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Rosa, Nicola, Maddalena De Bernardo, Angela Pepe, Livio Vitiello, Giuseppe Marotta, Roberto Imparato, and Luigi Capasso. "Corneal thickness evaluation in healthy eyes: Comparison between two different Scheimpflug devices." PLOS ONE 15, no. 12 (December 3, 2020): e0243370. http://dx.doi.org/10.1371/journal.pone.0243370.

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Purpose To evaluate the correlation between corneal thickness (CT) measurements obtained with two Scheimpflug devices, Pentacam HR and Precisio, and to elaborate, if necessary, a regression formula which could make these results comparable. Design Retrospective, Comparative, Observational study. Setting Department of Medicine, Surgery and Dentistry, “Scuola Medica Salernitana” University of Salerno, Italy Methods One hundred twenty four healthy eyes of 124 volunteers (65 males; range: 20–32 years; mean age of 24.8 ± 1.7) were included in this study. CT was measured using Pentacam HR and Precisio in three different points: the pupil center (PC), the corneal apex (CA) and the thinnest point (TP). Results CT obtained with both devices at the PC, at the CA and at the TP showed a good correlation (r = 0.97, r = 0.97, r = 0.97, respectively), but Pentacam HR measurements were significantly thicker than those provided by Precisio (p < 0.01). The differences between Pentacam HR and Precisio were 21.9 ± 8.8 μm at the PC, 21.9 ± 8.9 μm at the CA, 19.1 ± 9.0 μm at the TP. The calculated regression formulas were: y = 0.9558x + 2.3196 for the PC, y = 0.9519x + 4.5626 for the CA, y = 0.9364x + 15.436 for the TP, where x is the CT measured with Pentacam HR and y is the Precisio measurement. Conclusions The findings provided by this study highlight that Precisio measures thinner corneas compared to Pentacam HR. The identified regression formulas could be utilized to make interchangeable the results obtained with these two devices.

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28

Anandan, Vijaya, Rekha Srinivasan, Rashima Asokan, and Ronnie George. "Evaluation of anterior chamber volume using Pentacam and anterior segment optical coherence tomography among normal subjects." Asian Journal of Ophthalmology 16, no. 2 (November 21, 2018): 86–94. http://dx.doi.org/10.35119/asjoo.v16i2.367.

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Aim: To compare the anterior chamber volume measurements obtained with Pentacam and derived from anterior segment optical coherence tomography. Design: Cross-sectional study. Methods: We included normal subjects who underwent a comprehensive eye examination including refraction, keratometry, Goldmann applanation tonometry, gonioscopy, anterior segment optical coherence tomography (AS-OCT) (Carl Zeiss Meditec Inc.; Dublin, CA, USA) and Pentacam (Oculus Inc.; Lynnwood, WA, USA). Fifty scans were selected for Pentacam and 12 images were selected for calculation of anterior chamber volume. Only the right eye was considered for analysis. Results: One-hundred and nineteen eyes of 119 subjects were included for analysis. The mean age of the subjects was 42.58 ± 13.15 years, of which 74 were female and 45 were male. The mean anterior chamber volume measured using AS-OCT was 119.17 ± 26.56 mm3 and with Pentacam was 131.29 ± 34.26 mm3. The comparison of means between the two modalities was statistically significant (t = -8.857, Mean Difference (MD) = 12.11, 95% CI: (4.29, 19.95), p = 0.003). Bland-Altman plot showed poor agreement between the chamber volume measurements obtained by Pentacam and AS-OCT with MD of 12.1 mm3 (95 % CI: 41.4 to -17.1) and intra-class correlation between the two instruments was 0.94 (95% CI: 0.91, 0.96) (p < 0.0001). Conclusion: The anterior chamber volume can be measured using Pentacam as well as AS-OCT since these measurements were reliable. However, these measurements were not interchangeable due to poor levels of agreement.

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Dong, Jing, Yaqin Zhang, and Xiaogang Wang. "Calculation of Toric Intraocular Lens Power with the Barrett Calculator and Data from Three Keratometers." Journal of Tropical Medicine 2021 (August 20, 2021): 1–6. http://dx.doi.org/10.1155/2021/7712345.

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Aim. To investigate the interdevice agreement for differences in toric power calculated using data on anterior corneal astigmatism obtained with corneal topography/ray-tracing aberrometry (iTrace), partial coherence interferometry (IOLMaster 500), and Scheimpflug imaging (Pentacam). Methods. The analysis included 101 eyes (101 subjects) with regular astigmatism. The main outcome measures were corneal cylinder power, axis of astigmatism, and keratometry values. Toricity and toric IOL power were calculated using the online Barrett toric calculator. Interdevice agreement for measurement and calculation was assessed using a paired sample t-test and a nonparametric test. Results. Significant interdevice differences were noted in the magnitude of astigmatism and flat, steep, and mean keratometry values between iTrace and IOLMaster (all P < 0.01 ); in flat, steep, and mean keratometry values (all P < 0.001 ) but not in the magnitude of astigmatism ( P = 0.325 ) between iTrace and Pentacam; and in the magnitude of astigmatism and steep and mean keratometry values (all P < 0.01 ) but not in flat keratometry values ( P = 0.310 ) between IOLMaster and Pentacam. The toric IOL power calculated using data from the three devices showed the following trend: iTrace > IOLMaster (0.49 ± 0.36, P < 0.001 ) and Pentacam (0.39 ± 0.42, P < 0.001 ) and Pentacam was <IOLMaster (−0.10 ± 0.39, P = 0.009 ). There were differences in toricity calculated using data from the three devices ( P = 0.004 ). Conclusions. Differences in toric IOL power and toricity calculated using anterior keratometry data from iTrace, IOLMaster 500, and Pentacam should be noted in clinical practice.

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De Bernardo, Maddalena, Palmiro Cornetta, Giuseppe Marotta, Giulio Salerno, Ilaria De Pascale, and Nicola Rosa. "Measurement of corneal thickness using Pentacam HR versus Nidek CEM-530 specular microscopy." Journal of International Medical Research 48, no. 4 (December 26, 2019): 030006051989238. http://dx.doi.org/10.1177/0300060519892385.

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Objective To compare corneal thickness (CT) measurements using the CEM-530 (Nidal, Gamagori, Japan) and Pentacam HR (Oculus, Wetzlar, Germany). Methods The CT of 209 healthy subjects (209 right eyes) aged 24 to 89 years (71.35 ± 10.72 years) was measured at the corneal apex (CA), pupil center (PC), and thinnest point (TP) with the Pentacam HR and at the corneal center with the CEM-530 in random order at the same time of day. Results A good correlation but statistically significant difference was found between the CEM-530 and Pentacam HR measurements at the CA (6.10 ± 8.12 µm, R2 = 0.8947), PC (7.46 ± 8.57 µm, R2 = 0.8826), and TP (12.44 ± 10.04 µm, R2 = 0.8392). Comparison of the two devices produced the following regression formulas: y = 0.8859x + 57.644 for the CA, y = 0.8852x +56.657 for the PC, and y = 0.8557x + 68.148 for the TP, where x is the CT obtained with the CEM-530 and y is that obtained with the Pentacam HR. Conclusions These findings indicate that the CEM-530 produces a thicker corneal measurement than the Pentacam HR. The herein-proposed correcting factors are needed to reliably compare these devices.

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Yu, Ayong, Weiqi Zhao, Giacomo Savini, Zixu Huang, Fangjun Bao, Weicong Lu, Qinmei Wang, and Jinhai Huang. "Evaluation of Central Corneal Thickness Using Corneal Dynamic Scheimpflug Analyzer Corvis ST and Comparison with Pentacam Rotating Scheimpflug System and Ultrasound Pachymetry in Normal Eyes." Journal of Ophthalmology 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/767012.

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Purpose.To assess the repeatability and reproducibility of central corneal thickness (CCT) measurements by corneal dynamic Scheimpflug analyzer Corvis ST in normal eyes and compare the agreement with Pentacam rotating Scheimpflug System and ultrasound pachymetry.Methods.84 right eyes underwent Corvis ST measurements performed by two operators. The test-retest repeatability (TRT), within-subject coefficient of variation (CoV), and intraclass correlation coefficient (ICC) were used to evaluate the intraoperator repeatability and interoperator reproducibility. CCT measurements also were obtained from Pentacam and ultrasound pachymetry by the first operator. The agreement between the three devices was evaluated with 95% limits of agreement (LoA) and Bland-Altman plots.Results.Corvis ST showed high repeatability as indicated by TRT ≤ 13.0 μm, CoV < 0.9%, and ICC > 0.97. The interoperator reproducibility was also excellent. The CoV was <0.9%, and ICC was >0.97. Corvis ST showed significantly lower values than Pentacam and ultrasound pachymetry (P<0.001). The 95% LoA between Corvis ST and Pentacam or ultrasound pachymetry were −15.8 to 9.5 μm and −27.9 to 12.3 μm, respectively.Conclusions.Corvis ST showed excellent repeatability and interoperator reproducibility of CCT measurements in normal eyes. Corvis ST is interchangeable with Pentacam but not with ultrasound pachymetry.

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32

Müller-Wirtz, Lukas M., Daniel Kiefer, Joschua Knauf, Maximilian A. Floss, Jonas Doneit, Beate Wolf, Felix Maurer, et al. "Differential Response of Pentanal and Hexanal Exhalation to Supplemental Oxygen and Mechanical Ventilation in Rats." Molecules 26, no. 9 (May 7, 2021): 2752. http://dx.doi.org/10.3390/molecules26092752.

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High inspired oxygen during mechanical ventilation may influence the exhalation of the previously proposed breath biomarkers pentanal and hexanal, and additionally induce systemic inflammation. We therefore investigated the effect of various concentrations of inspired oxygen on pentanal and hexanal exhalation and serum interleukin concentrations in 30 Sprague Dawley rats mechanically ventilated with 30, 60, or 93% inspired oxygen for 12 h. Pentanal exhalation did not differ as a function of inspired oxygen but increased by an average of 0.4 (95%CI: 0.3; 0.5) ppb per hour, with concentrations doubling from 3.8 (IQR: 2.8; 5.1) ppb at baseline to 7.3 (IQR: 5.0; 10.8) ppb after 12 h. Hexanal exhalation was slightly higher at 93% of inspired oxygen with an average difference of 0.09 (95%CI: 0.002; 0.172) ppb compared to 30%. Serum IL-6 did not differ by inspired oxygen, whereas IL-10 at 60% and 93% of inspired oxygen was greater than with 30%. Both interleukins increased over 12 h of mechanical ventilation at all oxygen concentrations. Mechanical ventilation at high inspired oxygen promotes pulmonary lipid peroxidation and systemic inflammation. However, the response of pentanal and hexanal exhalation varies, with pentanal increasing by mechanical ventilation, whereas hexanal increases by high inspired oxygen concentrations.

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33

Mohd Abdullah, Azlindarita, Norasyikin Mustafa, Loo Voon Pei, and Visvaraja Subrayan. "Agreement Analysis of Pentacam and Lenstar in Measurement of Keratometry, Anterior Chamber Depth and Lens Thickness." Journal of Clinical and Health Sciences 1, no. 1 (June 30, 2016): 10. http://dx.doi.org/10.24191/jchs.v1i1.5848.

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Introduction: To assess the agreement of the Scheimpflug camera system Pentacam with the optical low-coherence reflectometry (OLCR) device LENSTAR LS900 in measuring anterior segment biometry. Methods: This is a prospective, non- randomized, comparative analysis study. Patients with age-related nucleus sclerosis cataract who fulfilled the inclusion criteria and attended the Ophthalmology Clinic in University of Malaya Medical Centre (UMMC) between December 2011 and March 2012 were recruited. The keratometer, anterior chamber (AC) depth and lens thickness were measured with both methods Pentacam and Lenstar. Results: 223 eyes of 125 patients were analysed. There was an agreement in the keratometer, anterior chamber depth and lens thickness measurement between the two devices. There was a significant correlation between K-reading as measured by both devices, at 0.05 significant level, with correlation coefficient of 0.904 and p < 0.001. The correlation coefficient of AC depth measurement between Pentacam and Lenstar at 0.05 significant level was 0.992 (p < 0.001). From the 124 eyes in which the lens thickness were measureable with both Pentacam and Lenstar, a positive correlation was noted (correlation coefficient of 0.585, p-value of < 0.001). There was no significant difference in the three parameters between males and females and among Malay, Chinese and Indian patients. Conclusions: There is a statistical agreement in the anterior segment biometry measurements between the Pentacam and the Lenstar.

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Larson, Jean A. "An ordinal partition avoiding pentagrams." Journal of Symbolic Logic 65, no. 3 (September 2000): 969–78. http://dx.doi.org/10.2307/2586684.

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AbstractSuppose that α = γ + δ where γ ≥ δ > 0. Then there is a graph which has no independent set of order type and has no pentagram (a pentagram is a set of five points with all pairs joined by edges). In the notation of Erdős and Rado. who generalized Ramsey's Theorem to this setting.

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35

Girgis, Adel S. "Facile Regioselective Synthesis of 1,2,6,8-Tetraazaspiro[4.4]nona-2,6-dien-9-ones." Zeitschrift für Naturforschung B 55, no. 2 (February 1, 2000): 222–26. http://dx.doi.org/10.1515/znb-2000-0215.

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1,3-Dipolar cycloaddition reaction of nitrilimines to a variety of 3-aryl-5-arylmethylidene- 3,5-dihydro-2-phenyl-4H-imidazol-4-ones (3) afforded the corresponding 1,3,4,7,8-pentaaryl -1,2,6,8-tetraazaspiro[4.4]-nona-2,6-dien-9-ones (4) and not the regio-isomers 2,3,6,8,9-pentaaryl- 1,3,7,8-tetraazaspiro[4.4]nona-1,6-dien-4-ones (5) in high regioselectivity.

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36

Silverman, Ronald H., Raksha Urs, Arindam RoyChoudhury, Timothy J. Archer, Marine Gobbe, and Dan Z. Reinstein. "Combined Tomography and Epithelial Thickness Mapping for Diagnosis of Keratoconus." European Journal of Ophthalmology 27, no. 2 (August 8, 2016): 129–34. http://dx.doi.org/10.5301/ejo.5000850.

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Purpose Scanning Scheimpflug provides information regarding corneal thickness and 2-surface topography while arc-scanned high-frequency ultrasound allows depiction of the epithelial and stromal thickness distributions. Both techniques are useful in detection of keratoconus. Our aim was to develop and test a keratoconus classifier combining information from both methods. Methods We scanned 111 normal and 30 clinical keratoconus subjects with Artemis-1 and Pentacam data. After selecting one random eye per subject, we performed stepwise linear discriminant analysis on a dataset combining parameters generated by each method to obtain classification models based on each technique alone and in combination. Results Discriminant analysis resulted in a 4-variable model (R2 = 0.740) based on Artemis data alone and a 4-variable model (R2 = 0.734) using Pentacam data alone. The combined model (R2 = 0.828) consisted of 3 Artemis- and 4 Pentacam-derived variables. The combined model R value was significantly higher than either model alone (p = 0.031, one-tailed). In cross-validation, Artemis had 100% sensitivity and 99.2% specificity, Pentacam had 97.3% sensitivity and 98.0% specificity, and the combined model had 97.3% sensitivity and 100% specificity. Conclusions Pentacam, Artemis, and combined models were all effective in distinguishing normal from clinical keratoconus subjects. From the standpoint of variance explained by the model (R2 values), the combined model was most effective. Application of the model to early and subclinical keratoconus will ultimately be required to assess the effectiveness of the combined approach.

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Ambrósio Jr., Renato. "Clinical Applications of the Pentacam." Highlights of Ophthalmology 39, no. 3ENG (2011): 16–20. http://dx.doi.org/10.5005/hoo-10101-39304.

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Schwartz, Richard Evan. "The Pentagram Map is Recurrent." Experimental Mathematics 10, no. 4 (January 2001): 519–28. http://dx.doi.org/10.1080/10586458.2001.10504671.

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Felipe, Raúl, and Gloria Marí Beffa. "The pentagram map on Grassmannians." Annales de l'Institut Fourier 69, no. 1 (2019): 421–56. http://dx.doi.org/10.5802/aif.3248.

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BAUMEISTER, M. "Pentacam measurements and IOL scattering." Acta Ophthalmologica 91 (August 2013): 0. http://dx.doi.org/10.1111/j.1755-3768.2013.4254.x.

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Gharieb, Hesham Mohamed, Ihab Saad Othman, and Rania Serag Elkitkat. "Orbscan 3 Versus Pentacam HR." Cornea 39, no. 5 (May 2020): 649–53. http://dx.doi.org/10.1097/ico.0000000000002257.

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42

Soloviev, Fedor. "Integrability of the pentagram map." Duke Mathematical Journal 162, no. 15 (December 2013): 2815–53. http://dx.doi.org/10.1215/00127094-2382228.

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43

Roux, C., C. Böhm, A. Dörr, S. Eliseev, S. George, M. Goncharov, Y. N. Novikov, et al. "The trap design of PENTATRAP." Applied Physics B 107, no. 4 (November 26, 2011): 997–1005. http://dx.doi.org/10.1007/s00340-011-4825-4.

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44

Khesin, Boris, and Fedor Soloviev. "Integrability of higher pentagram maps." Mathematische Annalen 357, no. 3 (March 29, 2013): 1005–47. http://dx.doi.org/10.1007/s00208-013-0922-5.

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45

Matar, C., L. Daas, S. Suffo, A. Langenbucher, B. Seitz, and T. Eppig. "Reliabilität der Hornhauttomographie nach Implantation von intrakornealen Ringsegmenten bei Keratokonus." Der Ophthalmologe 117, no. 11 (March 5, 2020): 1092–99. http://dx.doi.org/10.1007/s00347-020-01074-w.

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Zusammenfassung Hintergrund und Ziel Intrakorneale Ringsegmente (ICRS) sollen die Progression des Keratokonus (KK) aufhalten. Diese Aussage zur Progression erfordert jedoch Kenntnisse über die Reproduzierbarkeit der angewendeten Messverfahren. Ziel dieser Studie war es, die Reproduzierbarkeit tomographischer Parameter in Augen mit Keratokonus (KK) nach femtosekundenlasergestützter INTACS-Implantation (fs-INTACS) zwischen 2 Hornhauttomographen zu vergleichen. Patienten und Methoden 19 KK-Augen wurden eingeschlossen. 5 Messungen wurden mit dem Scheimpflug-Tomographen Pentacam HR und dem optischen Kohärenztomographen (VA-OCT) Casia 2 durchgeführt. Zielgrößen waren die Reproduzierbarkeit und die Vergleichbarkeit der Messungen von (1) keratometrischem Brechwert der Hornhautvorder- und (2) -rückfläche, (3) maximalem keratometrischem Brechwert, (4) zentraler Hornhautdicke und (5) Hornhautdicke an der dünnsten Stelle zwischen beiden Geräten. Ergebnisse Die mittlere Differenz (Pentacam minus VA-OCT) von (1), (2), (3), (4) und (5) lag bei 0,67 dpt, 0,41 dpt, 3,4 dpt, 1,5 µm und 11,8 µm. Die mittlere SD der 5 Wiederholungen für (1), (2), (3), (4) und (5) lag bei 0,20 dpt/0,20 dpt, 0,10 dpt/0,07 dpt, 0,75 dpt/0,5 dpt, 6,5/2,4 µm (p = 0,007) und 7,3 µm/1,9 µm (p = 0,001) für Pentacam/Casia 2. Cronbach’s α war für alle Geräte und Parameter besser als 0,98. Schlussfolgerung Casia 2 und Pentacam ermöglichen beide eine zuverlässige Beurteilung der Hornhautbrechkraft bei KK nach fs-INTACS-Implantation. Die Reproduzierbarkeit war nur für die Hornhautdickenmessung mit Casia 2 signifikant besser. Pentacam zeigte signifikant höhere Werte für die Brechkraft der Hornhautvorder- und Rückfläche und misst signifikant dicker an der dünnsten Stelle im Vergleich zu Casia 2.

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Zhu, Lei, Thomas Cronin, and Amarjit Narang. "Wavelength-Dependent Photolysis of i-Pentanal and t-Pentanal from 280 to 330 nm." Journal of Physical Chemistry A 103, no. 36 (September 1999): 7248–53. http://dx.doi.org/10.1021/jp991540p.

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Wu, Feng, Xifang Zhu, and Xiaoyan Jiang. "Pentagram star pattern identification algorithm applied in three-head star sensors." Modern Physics Letters B 31, no. 19-21 (July 27, 2017): 1740046. http://dx.doi.org/10.1142/s0217984917400462.

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A pentagram star pattern identification algorithm for three-head star sensors was proposed. Its realization scheme was presented completely. Simulated star maps were produced by letting the three-head star sensor travel around the celestial sphere randomly and image the observed stars. Monte Carlo experiments were carried out. The performances of the pentagram algorithm were evaluated. It proves that its identification success rate reaches up to 98%.

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48

Piñana, Marisa. "Marisa Piñana." EME Experimental Illustration, Art & Design 6, no. 6 (July 31, 2018): 54. http://dx.doi.org/10.4995/eme.2018.10085.

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49

Glick, Max. "The Limit Point of the Pentagram Map." International Mathematics Research Notices 2020, no. 9 (May 21, 2018): 2818–31. http://dx.doi.org/10.1093/imrn/rny110.

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Abstract The pentagram map is a discrete dynamical system defined on the space of polygons in the plane. In the 1st paper on the subject, Schwartz proved that the pentagram map produces from each convex polygon a sequence of successively smaller polygons that converges exponentially to a point. We investigate the limit point itself, giving an explicit description of its Cartesian coordinates as roots of certain degree three polynomials.

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Zhang, Yaqin, Jing Dong, Suhua Zhang, Bin Sun, Xiaoliang Wang, Maolong Tang, and Xiaogang Wang. "Corneal Astigmatism Measurements Comparison among Ray-Tracing Aberrometry, Partial Coherence Interferometry, and Scheimpflug Imaging System." Journal of Ophthalmology 2020 (April 1, 2020): 1–7. http://dx.doi.org/10.1155/2020/3012748.

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Purpose. To investigate interdevice agreement among corneal topography/ray-tracing aberrometry (iTrace), partial coherence interferometry (IOLMaster), and Scheimpflug imaging (Pentacam) for the measurement of corneal astigmatism. Methods. The analysis included 90 eyes of 90 subjects without ocular disease. The main outcome measures were corneal cylinder power and axis of astigmatism. All corneal astigmatism measurements were converted to two perpendicular components by using vector analysis. Interdevice agreement was assessed using Bland–Altman analysis, paired sample t-test, and one-way analysis of variance. Results. No significant interdevice difference existed in the astigmatism magnitude, cardinal component, and oblique component (all P>0.05). On comparing iTrace wavefront and simulated keratometry (SimK) astigmatism, significant differences were observed in the astigmatism magnitude and oblique component (both P<0.01), but not in the cardinal component (P=0.687). On comparing Pentacam pupil 3 mm and corneal vertex 3 mm axial astigmatism, significant difference was observed in the astigmatism magnitude (P<0.001), but not in the cardinal and oblique components (both P>0.05). Conclusions. The iTrace, IOLMaster, and Pentacam devices could be used interchangeably for corneal astigmatism measurement. However, the measurement difference in iTrace wavefront and SimK astigmatism and Pentacam pupil 3 mm and vertex 3 mm axial astigmatism should be considered in clinic practice.

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