Objective: Atrial fibrillation (AF), commonly observed in advanced ages, displays striking age dependent increase and increased P wave dispersion (PWD) has been shown to be a predictor of AF. In this study we sought to determine whether P wave duration and PWD increase with aging. Method and Results:Eighty-three elderly subjects (group-I mean age 75±8 years) and 40 healthy young subjects (group-II, mean age 37±6 years) participated in this study. 12-lead ECG recorded at a paper speed of 50mm/s was obtained from each participant. Maximum (Pmax) and minimum P wave duration (Pmin) was measured manually with a caliper and the difference between two values was defined as PWD. Pmax and PWD were significantly higher in group-I compared to group-II. (98±8 vs. 93±8 p=0.01, 41±12 vs. 34±13 p=0.002, respectively). Among the elderly population when those with cardiovascular disorders such as hypertension, coronary artery disease and heart failure were excluded, Pmax and PWD were still significantly higher than the young population. (Pmax: 98±7 vs. 93±7, p=0.02 and PWD: 42±11 vs. 34±13, p=0.002). Moreover, on correlation analysis a positive correlation was detected between Pmax and PWD and aging. (r=0.29, p=0.004; r=0.30, p=0.003 respectively). Conclusion:PWD shows age dependent increase and may be a useful marker for estimation the risk of developing AF seen in advanced ages Key Words: Aging, p wave dispersion, atrial fibrillation ÖZET Yafl ile P Dalga Dispersiyonu Aras›ndaki IliflkiAmaç: ‹leri yafllarda yag›n olarak görülen atriyal fibrilasyon; yafl ba¤›ml› olarak çarp›c› bir art›fl göstermek-tedir ve artm›fl p dalga dispersiyonunun atriyal fibrilasyonun bir ön gördürücüsü oldu¤u gösterilmifltir. Bu çal›flmada, yaflla birlikte p dalga dispersiyonunun art›p artmad›¤›n› araflt›rd›k.Metod ve Bulgular: 83 yafll› hasta (grup-1; yafl ortalamas› 75±8 y›l) ve 40 sa¤l›kl› genç birey (grup-2; yafl ortalamas› 37±6 y›l) bu çal›flmaya dahil edildi. Her bir kat›l›mc›dan 50 mm/s ka¤›t h›z›nda 12-derivasyonlu EKG kayd› al›nd›. Maksimum ve minimum p dalga süreleri cetvel ile manuel olarak ölçüldü ve her iki de¤er aras›ndaki fark P dalga dispersiyonu (PDD) olarak tan›mland›. grup-1 maksimum p dalga süresi ve PDD anlaml› flekilde grup-2'den yüksek idi (98±8 ve 93±8 ms p=0.01; 41±12 ve 34±13 ms p=0.002, s›ra-s›yla). Yafll› grup aras›nda hipertansiyon, koroner arter hastal›¤› ve kalp yetersizli¤i gibi kardiyovasküler hastal›klar› olanlar d›flland›¤›nda bile maksimum p dalga süresi ve PDD yine de genç popülasyondan yük-sek idi (Pmax: 98±7 ve 93±7 ms , p=0.02; PDD: 42±11 ve 34±13ms, p=0.002). Üstelik, korelasyon analizinde maksimum p dalga süresi, PDD ve yafl aras›nda pozitif bir korelasyon saptand› (r=0.29, p=0.004; r=0.30, p=0.003 s›ras›yla).Sonuç: PDD yafl ba¤›ml› art›fl göstermektedir ve ileri yafllarda görülen atriyal fibrilasyon geliflim riskini tahmin etmek için faydal› bir gösterge olabilir.
Background and aimsProblematic use of the internet (PUI) among adolescents has become one of the public problems around the world. Understanding the developmental trajectory of PUI may be beneficial to develop prevention and intervention. The current study aimed to identify the developmental trajectories of PUI among adolescents, considering individual differences over time. And also explored how familial factors contributed to the identified trajectories, and the relationship between PUI changes over time and social, mental health, and academic functioning.MethodsA total of 1,149 adolescents (Mage = 15.82, SD = 0.61; 55.27% girls at Wave 1) participated in assessments at four time points, using 6-month assessment intervals.ResultsBased on a latent class growth model, three trajectories of PUI were identified: Low Decreasing, Moderate Increasing, and High Increasing groups. Multivariate logistic regression analyses suggested that inter-parental conflicts and childhood maltreatment served as negative familial predictors for the risk trajectories of PUI (i.e., Moderate Increasing and High Increasing groups). Additionally, adolescents in these two groups displayed more estranged interpersonal relationships, more mental health difficulties, and poorer academic functioning.Discussion and conclusionsIt is important to consider individual differences in understanding the developmental patterns of PUI among adolescents. Identifying family predictors and the behavioral outcome associated with groups with different developmental trajectories of PUI, which may help to understand better risk factors related to specific developmental patterns of PUI and its adverse correlates. The findings highlight a need to develop more specific effective intervention programs for individuals displaying different problematic developmental trajectories with PUI.
This study was conducted to determine fresh forage yield, dry matter yield, and their affecting components in promising narbon vetch lines (Vicia narbonensis L.) under rainfed conditions in the Southeastern Anatolia region of Turkey. Field trials were performed in the research areas of GAP International Agricultural Research and Training Center (GAP IARTC) in Diyarbakir, Turkey during the 2008-09, 2009-10 and 2010-11 growing seasons with winter sowings. Experiments were established according to randomized blocks design with three replications. Although the genotype × year interaction for the natural plant height trait was not found to be significant, the interaction was statistically significant (P<0.05) for the main stem number trait. For the other five traits, including fresh forage and dry matter yields, the genotype × year interaction was highly statistically significant (P<0.01). Among growing seasons and genotypes the investigated traits had ranges as follows: fresh forage yield -19.42-37.95 t ha ; and main stem thickness -33.2-4.97 mm. Correlation analyses indicated that there were highly significant and positive correlation between fresh forage yield and dry matter yield, though the correlation between fresh forage yield and days to 50% flowering were found as statistically significant and positive (P<0.05). According to averages over the three study years five promising narbon vetch lines: IFVN 564-Sel 2379, IFVN 565-Sel 2380, IFVN 567-Sel 2382, IFVN 116-Sel 2461, IFVN 562-Sel 2470, were all found more productive than the control cultivar, Tarman-2002, in terms of both fresh forage yield and dry matter yield.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.