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1.
J Geriatr Oncol ; 15(3): 101748, 2024 04.
Artículo en Inglés | MEDLINE | ID: mdl-38493533

RESUMEN

INTRODUCTION: This study aimed to evaluate the association of race/ethnicity and patient care experiences (PCEs) with healthcare utilization and costs among US older adults with prostate cancer (PCa). MATERIALS AND METHODS: The study used data from 2007 to 2015 Surveillance, Epidemiology, and End Results dataset linked to Medicare Consumer Assessment of Healthcare Providers and Systems survey and Medicare claims (SEER-CAHPS). We identified males aged ≥65 years who completed a CAHPS survey within 6-60 months post-PCa diagnosis. Covariate-adjusted associations of six CAHPS PCE composite measures with any emergency department visit and any inpatient stay (using logistic regressions), and with total part A and part B Medicare costs (using generalized linear models) were examined by race/ethnicity (non-Hispanic White, non-Hispanic Black, Hispanic, non-Hispanic Asian, and other). RESULTS: Among 1834 PCa survivors, a 1-point higher score for getting care quickly was associated with higher odds (odds ratio 1.08; 95% confidence interval [CI]: 1.02-1.15; p = 0.009) of any inpatient stay in Hispanic patients. Higher total costs were associated with a 1-point higher score for getting needed care among Hispanic patients ($590.84; 95% CI: $262.15, $919.53; p < 0.001); a 1-point higher score for getting care quickly among Hispanic patients ($405.26; 95% CI: $215.83, $594.69; p < 0.001); and a 1-point higher score for customer service among patients belonging to other races ($361.69; 95% CI: $15.68, $707.69; p = 0.04). DISCUSSION: We observed differential associations by race/ethnicity between PCEs and healthcare utilization and costs. Further research is needed to explore the causes of these associations.


Asunto(s)
Supervivientes de Cáncer , Neoplasias de la Próstata , Masculino , Humanos , Anciano , Estados Unidos , Etnicidad , Medicare , Próstata , Programa de VERF , Neoplasias de la Próstata/terapia , Atención al Paciente , Costos de la Atención en Salud , Aceptación de la Atención de Salud
2.
Cancer Causes Control ; 35(4): 647-659, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38001335

RESUMEN

PURPOSE: This study aimed to evaluate the association of race/ethnicity, patient care experiences (PCEs), and receipt of definitive treatment and treatment modality among older adults in the United States (US) with localized prostate cancer (PCa). METHODS: Using Surveillance, Epidemiology and End Results dataset linked to Medicare Consumer Assessment of Healthcare Providers and Systems (SEER-CAHPS) for 2007-2015, we identified men aged ≥ 65 years who completed a CAHPS survey within one year before and one year after PCa diagnosis. Associations of race/ethnicity (non-Hispanic White (NHW), non-Hispanic Black (NHB), Hispanic, non-Hispanic Asian (NHA), and other) and of interactions between race/ethnicity and PCEs (getting needed care, getting care quickly, doctor communication, and care coordination) with the receipt of definitive PCa treatment and treatment modality within 3 and 6 months of diagnosis were examined using logistic regressions. RESULTS: Among 1,438 PCa survivors, no racial/ethnic disparities in the receipt of definitive treatment were identified. However, NHB patients were less likely to receive surgery (vs. radiation) within 3 and 6 months of PCa diagnosis than NHW patients (OR 0.397, p = 0.006 and OR 0.419, p = 0.005), respectively. Among NHA patients, a 1-point higher score for getting care quickly was associated with lower odds (OR 0.981, p = 0.043) of receiving definitive treatment within 3 months of PCa diagnosis, whereas among NHB patients, a 1-point higher score for doctor communication was associated with higher odds (OR 1.023, p = 0.039) of receiving definitive treatment within 6 months of PCa diagnosis. DISCUSSION: We observed differential associations between PCEs and receipt of definitive treatment based on patient race/ethnicity. Further research is needed to explore these associations.


Asunto(s)
Supervivientes de Cáncer , Neoplasias de la Próstata , Masculino , Humanos , Anciano , Estados Unidos/epidemiología , Etnicidad , Medicare , Próstata , Programa de VERF , Neoplasias de la Próstata/epidemiología , Atención al Paciente
3.
J Gen Intern Med ; 2023 Nov 16.
Artículo en Inglés | MEDLINE | ID: mdl-37973707

RESUMEN

BACKGROUND: Hypertension management is complex in older adults. Recent advances in remote patient monitoring (RPM) have warranted evaluation of RPM use and patient outcomes. OBJECTIVE: To study associations of RPM use with mortality and healthcare utilization measures of hospitalizations, emergency department (ED) utilization, and outpatient visits. DESIGN: A retrospective cohort study. PATIENTS: Medicare beneficiaries aged ≥65 years with an outpatient hypertension diagnosis between July 2018 and September 2020. The first date of RPM use with a corresponding hypertension diagnosis was recorded (index date). RPM non-users were documented from those with an outpatient hypertension diagnosis; a random visit was selected as the index date. Six months prior continuous enrollment was required. MAIN MEASURES: Outcomes studied within 180 days of index date included (i) all-cause mortality, (ii) any hospitalization, (iii) cardiovascular-related hospitalization, (iv) non-cardiovascular-related hospitalization, (v) any ED, (vi) cardiovascular-related ED, (vii) non-cardiovascular-related ED, (viii) any outpatient, (ix) cardiovascular-related outpatient, and (x) non-cardiovascular-related outpatient. Patient demographics and clinical variables were collected from baseline and index date. Propensity score matching (1:4) and Cox regression were performed. Hazard ratios (HR) and 95% confidence intervals (CI) are reported. KEY RESULTS: The matched sample had 16,339 and 63,333 users and non-users, respectively. Cumulative incidences of mortality outcome were 2.9% (RPM) and 4.3% (non-RPM), with a HR (95% CI) of 0.66 (0.60-0.74). RPM users had lower hazards of any [0.78 (0.75-0.82)], cardiovascular-related [0.79 (0.73-0.87)], and non-cardiovascular-related [0.79 (0.75-0.83)] hospitalizations. No significant association was observed between RPM use and the three ED measures. RPM users had higher hazards of any [1.10 (1.08-1.11)] and cardiovascular-related outpatient visits [2.17 (2.13-2.19)], while a slightly lower hazard of non-cardiovascular-related outpatient visits [0.94 (0.93-0.96)]. CONCLUSIONS: RPM use was associated with substantial reductions in hazards of mortality and hospitalization outcomes with an increase in cardiovascular-related outpatient visits.

4.
J Geriatr Oncol ; 14(6): 101554, 2023 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-37320932

RESUMEN

INTRODUCTION: Our purpose was to evaluate whether racial/ethnic disparities in patient care experiences (PCEs) differ between males with prostate cancer ("PCa group") and males without cancer ("non-cancer group"). MATERIALS AND METHODS: This retrospective study used 2007-2015 National Cancer Institute's Surveillance, Epidemiology and End Results registry data linked to Consumer Assessment of Healthcare Providers and Systems surveys. PCa and non-cancer groups were propensity score matched 1:5 on demographic and clinical characteristics. Differences in racial/ethnic disparities (DRD) (non-Hispanic Black [NHB], Hispanic, non-Hispanic Asian [NHA], and Other Races compared to non-Hispanic White [NHW]) in PCEs (getting needed care, getting care quickly, doctor communication, customer service, and getting needed prescription drugs) were compared between matched PCa and non-cancer groups. Per prior literature, DRD in PCE scores were categorized as small (<3), medium (≥3 but <5) or large (≥5). RESULTS: There were 7312 males in the PCa group and 36,559 matched males in the non-cancer group. Within each group, all racial/ethnic minority categories reported worse scores compared to NHW individuals (p < 0.05) for ≥3 PCE composite measures. Compared to PCa group, a larger NHA-NHW difference was observed in non-cancer group for getting needed care (-4.65 in PCa vs. -7.77 in non-cancer; DRD = 3.11, p = 0.029) and doctor communication (-2.46 in PCa vs. -4.85 in non-cancer; DRD = 2.38, p = 0.023). DISCUSSION: In both PCa and non-cancer groups, racial/ethnic minorities reported worse experiences compared to NHW individuals for several PCE measures. However, the difference in getting needed care and doctor communication between NHA and NHW individuals were more pronounced in non-cancer group than PCa group.


Asunto(s)
Supervivientes de Cáncer , Disparidades en Atención de Salud , Neoplasias de la Próstata , Humanos , Masculino , Negro o Afroamericano , Etnicidad , Grupos Minoritarios , Atención al Paciente , Próstata , Neoplasias de la Próstata/terapia , Neoplasias de la Próstata/epidemiología , Grupos Raciales , Estudios Retrospectivos , Estados Unidos/epidemiología , Hispánicos o Latinos , Blanco , Asiático , Programa de VERF
5.
J Telemed Telecare ; : 1357633X231166026, 2023 Apr 05.
Artículo en Inglés | MEDLINE | ID: mdl-37016902

RESUMEN

BACKGROUND: Telehealth is a rapidly growing modality for expanding healthcare access, especially in the post-COVID-19 era. However, telehealth requires high-quality broadband, thus making broadband a social determinant of health. The objective of this study was to evaluate the association between broadband access and telehealth utilization across the United States during the COVID-19 pandemic. METHODS: Using a cross-sectional, ecological study design, we merged county-level data on broadband capacity (Microsoft's Rural Broadband Initiative), telehealth utilization among Medicare Fee-for-Service beneficiaries from January through September 2020 (CareJourney), and county-level socioeconomic characteristics (Area Health Resources Files). Multivariable linear regression was used to estimate the association between broadband capacity, county-level characteristics, and telehealth utilization. RESULTS: Among the 3107 counties, those with the greatest broadband availability (quintile 5) had 47% higher telehealth utilization compared to counties with the least broadband availability (quintile 1). In the adjusted model, a 1 standard deviation (SD) increase in broadband access was associated with a 1.54 percentage point (pp) increase in telehealth utilization (P < 0.001). Rural county designation (-1.96 pp; P < 0.001) and 1 SD increases in average Medicare beneficiary age (-1.34 pp; P = 0.001), number of nursing home beds per 1000 individuals (-0.38 pp; P = 0.002), and proportion of Native Americans/Pacific Islanders (-0.59 pp; P < 0.001) were associated with decreased telehealth utilization. CONCLUSION: The association between broadband access and telehealth utilization and the decreased telehealth utilization in rural areas highlight the importance of broadband access for healthcare access and the need to continue investing in broadband infrastructure to promote equitable healthcare access across populations.

6.
Cancers (Basel) ; 15(7)2023 Mar 23.
Artículo en Inglés | MEDLINE | ID: mdl-37046601

RESUMEN

BACKGROUND: We sought to evaluate rural-urban disparities in patient care experiences (PCEs) among localized prostate cancer (PCa) survivors at intermediate-to-high risk of disease progression. METHODS: Using 2007-2015 Surveillance Epidemiology and End Results (SEER) data linked to Medicare Consumer Assessment of Healthcare Providers and Systems (CAHPS) surveys, we analyzed survivors' first survey ≥6 months post-diagnosis. Covariate adjusted linear regressions were used to estimate associations of treatment status (definitive treatment vs. none) and residence (large metro vs. metro vs. rural) with PCE composite and rating measures. RESULTS: Among 3779 PCa survivors, 1798 (53.2%) and 370 (10.9%) resided in large metro and rural areas, respectively; more rural (vs. large metro) residents were untreated (21.9% vs. 16.7%; p = 0.017). Untreated (vs. treated) PCa survivors reported lower scores for doctor communication (ß = -2.0; p = 0.022), specialist rating (ß = -2.5; p = 0.008), and overall care rating (ß = -2.4; p = 0.006). While treated rural survivors gave higher (ß = 3.6; p = 0.022) scores for obtaining needed care, untreated rural survivors gave lower scores for obtaining needed care (ß = -7.0; p = 0.017) and a lower health plan rating (ß = -7.9; p = 0.003) compared to their respective counterparts in large metro areas. CONCLUSIONS: Rural PCa survivors are less likely to receive treatment. Rural-urban differences in PCEs varied by treatment status.

7.
J Matern Fetal Neonatal Med ; 36(1): 2167073, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-36683016

RESUMEN

BACKGROUND: The rates of SMM have been steadily increasing in Arkansas, a southern rural state, which has the 5th highest maternal death rate among the US states. The aims of the study were to test the functionality of the Bateman index in association to SMM, in clustering the risks of pregnancies to SMM, and to study the predictability of SMM using the Bateman index. STUDY DESIGN: From the ANGELS database, 72,183 pregnancies covered by Medicaid in Arkansas between 2013 and 2016 were included in this study. The expanded CDC ICD-9/ICD-10 criteria were used to identify SMM. The Bateman comorbidity index was applied in quantifying the comorbidity burden for a pregnancy. Multivariable logistic regressions, KMeans method, and five widely used predictive models were applied respectively for each of the study aims. RESULTS: SMM prevalence remained persistently high among Arkansas women covered by Medicaid (195 per 10,000 deliveries) during the study period. Using the Bateman comorbidity index score, the study population was divided into four groups, with a monotonically increasing odds of SMM from a lower score group to a higher score group. The association between the index score and the occurrence of SMM is confirmed with statistical significance: relative to Bateman score falling in 0-1, adjusted Odds Ratios and 95% CIs are: 2.1 (1.78, 2.46) for score in 2-5; 5.08 (3.81, 6.79) for score in 6-9; and 8.53 (4.57, 15.92) for score ≥10. Noticeably, more than one-third of SMM cases were detected from the studied pregnancies that did not have any of the comorbid conditions identified. In the prediction analyses, we observed minimal predictability of SMM using the comorbidity index: the calculated c-statistics ranged between 62% and 67%; the Precision-Recall AUC values are <7% for internal validation and <9% for external validation procedures. CONCLUSIONS: The comorbidity index can be used in quantifying the risk of SMM and can help cluster the study population into risk tiers of SMM, especially in rural states where there are disproportionately higher rates of SMM; however, the predictive value of the comorbidity index for SMM is inappreciable.


Asunto(s)
Complicaciones del Embarazo , Mujeres Embarazadas , Estados Unidos/epidemiología , Embarazo , Femenino , Humanos , Complicaciones del Embarazo/epidemiología , Medicaid , Comorbilidad , Prevalencia , Morbilidad
8.
Telemed J E Health ; 29(7): 1014-1026, 2023 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-36459121

RESUMEN

Purpose: To assess the factors associated with offering remote patient monitoring (RPM) services. Methods: We integrated three datasets: (1) 2019-2020 Area Health Resource Files, (2) 2019 American Community Survey, and (3) 2019 American Hospitals Association annual survey using county Federal Information Processing Standards code to evaluate associations between hospital characteristics and county-level demographic factors with provision of (1) post-discharge, (2) chronic care, (3) other RPM services, and (4) any of these three RPM service categories. These outcomes were analyzed using multi-level, mixed-effects multivariate logistic regression modeling to account for county-level clustering of hospitals. Findings: Among 3,381 hospitals, 1,354 (40.0%) provided any RPM services. Being part of a clinically integrated network (CIN) and private, non-profit (vs. public) ownership were respectively associated with 104.5% (95% confidence interval [CI]: 69.4-146.8%; p < 0.001) and 30.4% (95% CI: 2.5-66.0%; p = 0.031) higher odds of providing any RPM services. Critical access hospital (CAH) designation, for-profit (vs. public) ownership, and location in the South (vs. Northeast) were associated with significantly lowering odds of providing any RPM services by 36.2% (95% CI: 14.2-52.6%; p = 0.003), 70.1% (95% CI: 56.0-79.6%; p < 0.001), and 34.0% (95% CI: 2.8-55.1%; p = 0.035), respectively. Similar trends were found with the various RPM service categories. Conclusions: The factors most associated with provision of any RPM services were hospital-level factors. Specifically, being part of a CIN and private, non-profit ownership had the highest positive associations with offering RPM services whereas location in the South and CAH designation had the strongest negative associations. Further studies are needed to understand the reasons behind these associations.


Asunto(s)
Cuidados Posteriores , Alta del Paciente , Humanos , Estados Unidos , Atención a la Salud , Hospitales Privados , Encuestas y Cuestionarios
9.
J Cancer Surviv ; 17(3): 748-758, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-35687273

RESUMEN

PURPOSE: To assess associations between usual source of care (USC) type and health status, healthcare access, utilization, and expenses among adult cancer survivors. METHODS: This retrospective cross-sectional analysis using 2013-2018 Medical Expenditure Panel Survey included 2690 observations representing 31,953,477 adult cancer survivors who were currently experiencing cancer and reporting one of five USC types: solo practicing physician (SPP), a specific person in a non-hospital facility, a specific person in a hospital-based facility, a non-hospital facility, and a hospital-based facility. We used logistic regressions and generalized linear models to determine associations of USC type with health status, healthcare access, utilization, and expenses, adjusting for patient demographic and clinical characteristics. RESULTS: All non-SPP USC types were associated with reporting more difficulties contacting USC by telephone during business hours (p < 0.05). Compared to SPP, non-hospital facility was associated with more difficulty getting needed prescriptions (OR: 1.81, p = 0.036) and higher annual expenses ($5225, p = 0.028), and hospital-based facility was associated with longer travel time (OR: 1.61, p = 048), more ED visits (0.13, p = 0.049), higher expenses ($6028, p = 0.014), and worse self-reported health status (OR: 1.93, p = 0.001), although both were more likely to open on nights/weekends (p < 0.05). Cancer survivors with a specific person in a hospital-based facility (vs. SPP) as USC were > twofold as likely (p < 0.05) to report difficulty getting needed prescriptions and contacting USC afterhours. CONCLUSIONS: Among adult cancer survivors who were currently experiencing cancer, having a non-SPP type of UCS was associated with reporting more difficulties accessing care, worse health, more ED visits, and higher total expenses. IMPLICATIONS FOR CANCER SURVIVORS: Transitioning to SPP type of USC may result in better healthcare outcomes.


Asunto(s)
Supervivientes de Cáncer , Neoplasias , Adulto , Humanos , Estudios Retrospectivos , Gastos en Salud , Estudios Transversales , Accesibilidad a los Servicios de Salud , Neoplasias/terapia
10.
Curr Oncol ; 29(11): 8357-8373, 2022 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-36354719

RESUMEN

PURPOSE: To evaluate racial/ethnic disparities in patient care experiences (PCEs) among prostate cancer (PCa) survivors. METHODS: This retrospective study used 2007-2015 National Cancer Institute Surveillance, Epidemiology and End Results registry data linked to Consumer Assessment of Healthcare Providers and Systems surveys. First survey ≥ 6 months post-PCa diagnosis was analyzed. We performed multivariable linear regression, adjusting for demographic and clinical covariates, to evaluate the association of race/ethnicity (non-Hispanic Whites (NHWs), non-Hispanic Black (NHBs), Hispanic, non-Hispanic Asian (NHAs), and other races) with PCE composite measures: getting needed care, doctor communication, getting care quickly, getting needed prescription drugs (Rx), and customer service. RESULTS: Among 7319 PCa survivors, compared to NHWs, Hispanics, NHBs and NHAs reported lower scores for getting care quickly (ß = -3.69; p = 0.002, ß = -2.44; p = 0.021, and ß = -6.44; p < 0.001, respectively); Hispanics scored worse on getting needed care (ß = -2.16; p = 0.042) and getting needed Rx (ß = -2.93; p = 0.009), and NHAs scored worse on customer service (ß = -7.60; p = 0.003), and getting needed Rx (ß = -3.08; p = 0.020). However, NHBs scored better than NHWs on doctor communication (ß = 1.95, p = 0.006). No statistically significant differences were found between other races and NHWs. CONCLUSIONS: Comparing to NHWs, Hispanics and NHAs reported worse experiences on several PCE composite measures, while NHBs reported worse scores on one but better scores on another PCE composite measure. Further research is needed to understand the reasons behind these disparities and their influence on healthcare utilization and health outcomes among PCa survivors.


Asunto(s)
Supervivientes de Cáncer , Neoplasias de la Próstata , Masculino , Humanos , Etnicidad , Próstata , Estudios Retrospectivos , Atención al Paciente , Neoplasias de la Próstata/terapia
11.
Int Urol Nephrol ; 54(11): 2805-2811, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-35907159

RESUMEN

PURPOSE: This study evaluated possible predictors of long-term opioid usage among patients with ureteric stones who received ureteroscopy (URS) or shockwave lithotripsy (SWL). We also assessed opioid usage characteristics of URS and SWL recipients. MATERIALS AND METHODS: This retrospective study used IQVIA PharMetrics® Plus for Academics administrative claims database from years 2006-2020 to identify patients with a diagnosis of kidney or ureteral stones who were treated with either SWL or URS. We performed unadjusted bivariate analyses to compare opioid use characteristics of URS and SWL recipients, and performed logistic regression to determine demographic and clinical factors associated with becoming a long-term opioid user. RESULTS: The study population consisted of opioid naive individuals having a diagnosis of a kidney stone who underwent URS (N = 9407) or SWL (N = 4894). About 6.7% (N = 964) of study subjects were long-term opioid users. Unadjusted bivariate associations showed that compared to non-long-term opioid users, long-term opioid users had significantly greater total days' supply, total morphine milliequivalents (MME) supplied, and claims per month. A similar trend was observed for URS (vs. SWL) recipients. However, compared to SWL recipients, URS recipients had 14.3% (1.2-25.6%; p = 0.034) lower odds of becoming long-term users. Total days' supply (OR: 1.041 (95% CI 1.030-1.052; p < 0.001) and total MME supplied (OR 1.001 (95% CI 1.000-1.001; p < 0.001) were significantly associated with long-term usage. CONCLUSION: Higher total days' supply and total MME supplied as well as SWL were identified as risk factors for becoming long-term opioid users.


Asunto(s)
Cálculos Renales , Litotricia , Cálculos Ureterales , Analgésicos Opioides/uso terapéutico , Endrín/análogos & derivados , Humanos , Cálculos Renales/terapia , Morfina , Estudios Retrospectivos , Resultado del Tratamiento , Cálculos Ureterales/cirugía , Ureteroscopía
12.
Urol Oncol ; 40(1): 11.e1-11.e8, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-34716080

RESUMEN

PURPOSE: Health-related quality of life (HRQoL) outcomes, in addition to being useful for monitoring a person's health and well-being, may also predict overall survival (OS) in cancer patients. This study's objective was to examine the association of longitudinally assessed HRQoL and OS in patients with a history of bladder cancer (BC). MATERIALS AND METHODS: This longitudinal retrospective cohort study used the 1998 to 2013 Surveillance, Epidemiology and End Results database linked with Medicare Health Outcomes Survey. Study cohort included patients having HRQoL assessments both pre- and post-BC diagnosis using Short Form-36/Veterans Rand-12. Using Cox Proportional Hazards adjusted for demographics, tumor characteristics, and surgery type, we studied the associations of 3-point difference in HRQoL assessed pre- and post-BC diagnosis and change from pre-to-post diagnosis with overall survival. RESULTS: The study cohort included 438 BC patients with deceased patients (n = 222; 50.7%) being significantly older than those alive (77.2 vs. 75.4 years; P = 0.004). Adjusting for covariates, a 3-point difference in physical HRQoL (physical component summary [PCS]) pre-, post-, and pre-to-post BC diagnosis was associated with respectively 6.1%, 8.7%, and 7.3% (P < 0.01 for all) decreased risk of death for higher PCS. Similarly, a 3-point difference in mental HRQoL (mental component summary [MCS]) post-BC diagnosis was associated with 4.5% (P < 0.05) decreased risk of death for higher MCS. CONCLUSIONS: Associations between PCS/MCS and OS imply that elderly BC patients with better physical/mental health are more likely to survive longer. Monitoring HRQoL in routine cancer care would facilitate early detection of HRQoL decline and enable timely intervention by clinicians to improve OS.


Asunto(s)
Calidad de Vida , Neoplasias de la Vejiga Urinaria/mortalidad , Anciano , Anciano de 80 o más Años , Estudios de Cohortes , Femenino , Humanos , Estudios Longitudinales , Masculino , Pronóstico , Estudios Retrospectivos , Tasa de Supervivencia , Estados Unidos , Neoplasias de la Vejiga Urinaria/terapia
13.
Nanomedicine (Lond) ; 6(8): 1397-412, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-22091968

RESUMEN

AIMS: The present research focuses on the development of the surface modified solid lipid nanoparticulate (SLN) system for enhancing the stability and sustaining the release of a model hydrophilic drug ifosfamide. MATERIALS & METHODS: SLNs consisting of glyceryl monooleate (GMO) and chitosan were prepared by double emulsion technique, crosslinked with sodium tripolyphosphate, followed by lyophilization under two different vacuum conditions. The physicochemical characterization of SLNs included evaluation of surface morphology, particle size and surface charge, moisture content and physical state of the drug in the delivery system. The in vitro drug release and the stability were evaluated using high-performance liquid chromatography and liquid chromatography/mass spectrometry, respectively. Cellular permeability and subcellular localization studies were performed using Caco-2 cells. RESULTS: Different chamber pressures during lyophilization produced SLNs with different morphologies and moisture contents. SLNs demonstrated high encapsulation efficiency, sustained release, and enhanced stability of ifosfamide with a high cellular uptake and permeability for Caco-2 cells. CONCLUSION: GMO and chitosan SLNs could be successfully used for enhancing the stability, sustaining the release, enhancing the targeting and permeability characteristics of ifosfamide.


Asunto(s)
Ifosfamida/química , Lípidos/química , Nanopartículas/química , Células CACO-2 , Rastreo Diferencial de Calorimetría , Química Farmacéutica , Quitosano/química , Cromatografía Líquida de Alta Presión , Glicéridos/química , Humanos , Ifosfamida/farmacocinética , Microscopía Electrónica de Rastreo , Espectroscopía Infrarroja por Transformada de Fourier , Termogravimetría
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