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1.
Small ; 19(41): e2302598, 2023 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-37283475

RESUMEN

Li-O2 batteries are acknowledged as one of the most promising energy systems due to their high energy density approaching that of gasoline, but the poor battery efficiency and unstable cycling performance still hinder their practical application. In this work, hierarchical NiS2 -MoS2 heterostructured nanorods are designed and successfully synthesized, and it is found that heterostructure interfaces with internal electric fields between NiS2 and MoS2 optimized eg orbital occupancy, effectively adjusting the adsorption of oxygenated intermediates to accelerate reaction kinetics of oxygen evolution reaction and oxygen reduction reaction. Structure characterizations coupled with density functional theory calculations reveal that highly electronegative Mo atoms on NiS2 -MoS2 catalyst can capture more eg electrons from Ni atoms, and induce lower eg occupancy enabling moderate adsorption strength toward oxygenated intermediates. It is evident that hierarchical NiS2 -MoS2 nanostructure with fancy built-in electric fields significantly boosted formation and decomposition of Li2 O2 during cycling, which contributed to large specific capacities of 16528/16471 mAh g-1 with 99.65% coulombic efficiency and excellent cycling stability of 450 cycles at 1000 mA g-1 . This innovative heterostructure construction provides a reliable strategy to rationally design transition metal sulfides by optimizing eg orbital occupancy and modulating adsorption toward oxygenated intermediates for efficient rechargeable Li-O2 batteries.

2.
Mol Biol Rep ; 50(10): 7967-7979, 2023 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-37535247

RESUMEN

BACKGROUND: Millions of people around the globe are affected by Alzheimer's disease (AD). This crippling condition has no treatment despite intensive studies. Some phytocompounds have been shown to protect against Alzheimer's in recent studies. METHODS: Thus, this work aimed to examine Bacopa monnieri phytocompounds' synergistic effects on neurodegeneration, antioxidant activity, and cognition in the scopolamine-induced AD mice model. The toxicity study of two phytocompounds: quercetin and bacopaside X revealed an LD50 of more than 2000 mg/kg since no deaths occurred. RESULTS: The neuroprotection experiment consists of 6 groups i.e., control (saline), scopolamine (1 mg/kg), donepezil (5 mg/kg), Q (25 mg/kg), BX (20 mg/kg), and Q + BX (25 mg/kg + 20 mg/kg). Visual behavioral assessment using the Morris water maze showed that animals in the diseased model group (scopolamine) moved more slowly toward the platform and exhibited greater thigmotaxis behavior than the treatment and control groups. Likewise, the concentration of biochemical NO, GSH, and MDA improved in treatment groups concerning the diseased group. mRNA levels of different marker genes including ChAT, IL-1α, IL-1 ß, TNF α, tau, and ß secretase (BACE1) improved in treatment groups with respect to the disease group. CONCLUSION: Both bacopaside X and quercetin synergistically have shown promising results in neuroprotection. Therefore, it is suggested that Q and BX may work synergistically due to their antioxidant and neuroprotective property.


Asunto(s)
Enfermedad de Alzheimer , Bacopa , Fármacos Neuroprotectores , Humanos , Ratones , Animales , Enfermedad de Alzheimer/inducido químicamente , Enfermedad de Alzheimer/tratamiento farmacológico , Escopolamina/farmacología , Escopolamina/uso terapéutico , Bacopa/química , Secretasas de la Proteína Precursora del Amiloide , Quercetina/farmacología , Quercetina/uso terapéutico , Neuroprotección , Fármacos Neuroprotectores/farmacología , Fármacos Neuroprotectores/uso terapéutico , Ácido Aspártico Endopeptidasas , Antioxidantes/farmacología , Antioxidantes/uso terapéutico , Aprendizaje por Laberinto
3.
Antonie Van Leeuwenhoek ; 110(6): 759-769, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28439679

RESUMEN

Di-n-butyl phthalate (DBP) is a ubiquitous environmental contaminant that poses a risk to humans. Previous work indicates that the ability of lactic acid bacteria (LAB) to bind phthalic acid esters is strain-specific. As cell suspensions of LAB strains in aqueous solution are likely to be colloidal dispersions, this study provided a technique to efficiently screen LAB strains that bind DBP via Turbiscan, which has been widely used to measure the stability of emulsions or colloidal dispersions. Eleven LAB strains belonging to Lactobacillus plantarum, Lb. pentosus, Lb. paralimentarius, Lb. helveticus, Leuconostoc mesenteroides, Lb. acidophilus, Bifidobacterium lactis, and Bifidobacterium bifidum species were used in this study, and seven of them were selected to test in an earlier stage of exploring the process for finding a screening method; others were used for a validation test. It was observed that the various values of the 10 h Turbiscan Stability Index (TSI) of the cell suspension from each strain, at the equilibrium time of dispersed particles according to the peak thickness of cell-suspensions as measured by Turbiscan, had significant negative correlations with the DBP-binding percentage of LAB strains. Higher TSI values are correlated with lower binding of bacteria strains to DBP with a correlation coefficient of 0.8292. Cell surface hydrocarbons of LAB strains and their adherence were observed to correlate with DBP-binding percentages and may lead to the different states of aggregation or equilibrium of bacterial cell-suspensions, and the aggregation of bacterial cells resulted in fewer binding sites in the cell wall for DBP. Finally, four LAB strains were randomly selected to verify the feasibility of the method. In all, the findings demonstrate that TSI might be used as a tool to quickly screen strains that bind DBP. The present work could be extended to the removal of other toxic compounds, when screening of high-efficiency strains is required.


Asunto(s)
Bifidobacterium/metabolismo , Dibutil Ftalato/metabolismo , Contaminantes Ambientales/metabolismo , Ácido Láctico/metabolismo , Humanos , Lactobacillus
4.
Neurocrit Care ; 18(2): 257-60, 2013 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-22350855

RESUMEN

BACKGROUND: Severe subarachnoid hemorrhage may be associated with regional wall motion abnormalities (RWMA) in the absence of epicardial coronary occlusion. The RWMA extends beyond the distribution of a single coronary artery and may present in a typical tako-tsubo cardiomyopathy pattern. Other variants have also been recognized, including an inverted tako-tsubo pattern of severe basal hypokinesis that spares the apex. The mechanism of this cardiomyopathy is not well understood but likely involves catecholamine excess. While classic tako-tsubo cardiomyopathy from emotional stress carries a favorable prognosis, cardiac dysfunction from subarachnoid hemorrhage is a marker of overall poor prognosis. METHODS: We collected cases over a period of 4 years at a large teaching hospital. The cases represent cardiac dysfunction in the setting of subarachnoid hemorrhage in the unusual distribution of basal hypokinesis with relative sparing of the apex (inverted tako-tsubo pattern). RESULTS: A total of four cases were identified. All cases were female between the ages 43-67 years and had echocardiographic evidence of basal hypokinesis after suffering from an intracranial hemorrhage. CONCLUSIONS: The typical and inverted patterns may represent a spectrum within the same disease process or distinct clinical entities with dramatically different prognostic implications. Larger studies comparing the two presentations will help elucidate this further.


Asunto(s)
Hemorragia Subaracnoidea/complicaciones , Cardiomiopatía de Takotsubo/etiología , Cardiomiopatía de Takotsubo/fisiopatología , Adulto , Anciano , Angiografía Cerebral , Creatina Quinasa/sangre , Ecocardiografía , Electrocardiografía , Resultado Fatal , Femenino , Humanos , Persona de Mediana Edad , Índice de Severidad de la Enfermedad , Cardiomiopatía de Takotsubo/enzimología , Tomografía Computarizada por Rayos X , Troponina I/sangre
5.
BMC Cardiovasc Disord ; 11: 68, 2011 Nov 17.
Artículo en Inglés | MEDLINE | ID: mdl-22093082

RESUMEN

BACKGROUND: The aims of this study were to evaluate the awareness of and attitudes towards the 2005 European Society of Cardiology (ESC) guidelines for Heart Failure (HF) of the cardiologists in Pakistan and assess barriers to adherence to guidelines. METHODS: A cross-sectional survey was conducted in person from March to July 2009 to all cardiologists practicing in 4 major cities in Pakistan (Karachi, Lahore, Quetta and Peshawar). A validated, semi-structured questionnaire assessing ESC 2005 Guidelines for HF was used to obtain information from cardiologists. It included questions about awareness and relevance of HF guidelines (See Additional File 1). Respondents' management choices were compared with those of an expert panel based on the guidelines for three fictitious patient cases. Cardiologists were also asked about major barriers to adherence to guidelines. RESULTS: A total of 372 cardiologists were approached; 305 consented to participate (overall response rate, 82.0%). The survey showed a very high awareness of CHF guidelines; 97.4% aware of any guideline. About 13.8% considered ESC guidelines as relevant or very relevant for guiding treatment decisions while 92.8% chose AHA guidelines in relevance. 87.2% of respondents perceived that they adhered to the HF guidelines. For the patient cases, the proportions of respondents who made recommendations that completely matched those of the guidelines were 7% (Scenario 1), 0% (Scenario 2) and 20% (Scenario 3). Respondents considered patient compliance (59%) and cost/health economics (50%) as major barriers to guideline implementation. CONCLUSION: We found important self reported departures from recommended HF management guidelines among cardiologists of Pakistan.


Asunto(s)
Cardiología/normas , Adhesión a Directriz/normas , Insuficiencia Cardíaca/epidemiología , Insuficiencia Cardíaca/terapia , Médicos/normas , Adulto , Enfermedad Crónica , Estudios Transversales , Europa (Continente)/epidemiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pakistán/epidemiología
6.
J Pak Med Assoc ; 61(11): 1157-60, 2011 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22126007

RESUMEN

UNLABELLED: This study evaluated the short and long-term consequences of Percutaneous Mitral Valvuloplasty (PMV) in pregnant patients and their offspring, in a tertiary care setting, Karachi, Pakistan. The hospital database was used to retrieve all patients who underwent PMV during pregnancy in the period 1998-2007. The follow up data of the patients and the born children were obtained from the hospital records and also by contacting the patients via phone. Six patients underwent PMV but follow-up was available for 5 patients only. All 5 patients were admitted due to severe mitral stenosis with symptoms of dyspnea and palpitation. Mean age was 27 +/- 5.3 years with a mean gestational age at the time of procedure of 22.20 +/- 1.6 weeks. The mean valve area increased from 0.94 +/- 0.22 cm2 preoperatively to 1.62 +/- 0.50 cm2 post-operatively. The ejection fraction changed from a mean of 50 +/- 11.7% to 56 +/- 2.2%. There were no maternal deaths, abortions or stillbirths. Developmental milestones were achieved at the appropriate ages in all babies. PMV appears to be a safe and effective intervention for patients with severe MS during pregnancy. KEYWORDS: Mitral stenosis, Percutaneous Mitral


Asunto(s)
Cateterismo , Estenosis de la Válvula Mitral/terapia , Complicaciones Cardiovasculares del Embarazo/terapia , Adulto , Ecocardiografía , Ecocardiografía Doppler , Femenino , Estudios de Seguimiento , Hospitales de Enseñanza , Humanos , Estenosis de la Válvula Mitral/diagnóstico por imagen , Pakistán , Embarazo , Complicaciones Cardiovasculares del Embarazo/diagnóstico por imagen , Resultado del Embarazo , Factores de Tiempo , Resultado del Tratamiento , Adulto Joven
7.
Ann Thorac Surg ; 111(2): 556-560, 2021 02.
Artículo en Inglés | MEDLINE | ID: mdl-32687826

RESUMEN

BACKGROUND: The presence of a left ventricular thrombus (LVT) poses a risk of thromboembolic complications and excludes patients from undergoing left ventricular assist device (LVAD) implantation without the aid of cardiopulmonary bypass (CPB). Transthoracic echocardiography (TTE) and transesophageal echocardiography are used to detect LVT in patients with heart disease; however, the detection validity of these imaging studies has not been definitively elucidated. METHODS: A retrospective analysis of patients with end-stage heart failure who underwent LVAD implantation from May 2012 to August 2018 in a single center was completed. To be included, patients' medical records had to have presurgical TTE and transesophageal echocardiographic images, as well as intraoperative digital and visual exploration observations. A total of 301 patients underwent LVAD implantation; 239 of these patients had an LVAD implanted with the use of CPB. A total of 230 patients had complete data sets and were included in the analysis. RESULTS: Preoperative TTE identified LVT in 23 of the 230 patients (10%); 15 patients (6.5%) had LVT confirmed by surgical intraventricular visualization. Of the patients with visual LVT confirmation, preoperative TTE identified an LVT in all but 1 case (93%; 14 of 15). Preoperative TTE of LVT had a high sensitivity (94%) and specificity (96%), as well as high negative predictive value (99%). CONCLUSIONS: The results of this study show that preoperative TTE is highly accurate for LVT detection. The high negative predictive value could have significant implications for the choice of surgical procedure because with TTE, surgeons can reasonably determine whether LVAD placement procedure can be attempted without CPB support.


Asunto(s)
Ecocardiografía/métodos , Atrios Cardíacos/diagnóstico por imagen , Trombosis/diagnóstico por imagen , Adulto , Anciano , Ecocardiografía Transesofágica , Femenino , Corazón Auxiliar , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos
8.
BMC Neurol ; 9: 15, 2009 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-19368734

RESUMEN

BACKGROUND: Moyamoya is a rare cerebrovascular disease of unknown etiology. The data on moyamoya disease from Pakistan is sparse. We report a case series of 13 patients who presented with moyamoya disease to a tertiary care hospital in Pakistan with a national referral base. METHODS: We conducted a retrospective review of thirteen patients who presented to The Aga Khan University and diagnosed with "Moyamoya Disease" during the period 1988 - 2006. These patients were identified from existing hospital database via ICD-9 codes. A predesigned questionnaire containing information about clinical presentation, management and neuroimaging was administered to all identified patients. RESULTS: There were seven males and six females. Mean age at presentation was 16.5 years and a female predominance was found in the pediatric age group (n = 10, 71.4%). Stroke (n = 11, 84.2%) was the most common presentation with motor deficit being the universal cortical symptom. Fever was a common symptom in the lower age groups (n = 4, 51.7%). Cerebral Angiography and Magnetic Resonance Angiography showed bilateral involvement of the vessels in eleven patients while unilateral in two. Subarachnoid and interventricular haemorrhage appeared in 2(15.4%) adults. Twelve (92.3%) patients were discharged as independent with minor deficits regardless of therapeutic modality. Only three (23.0%) patients underwent surgery whereas the remaining were managed conservatively. CONCLUSION: Physicians when dealing with childhood strokes and characteristic deficits in adult population should consider Moyamoya disease.


Asunto(s)
Enfermedad de Moyamoya/diagnóstico , Adolescente , Adulto , Edad de Inicio , Electroencefalografía , Femenino , Humanos , Masculino , Enfermedad de Moyamoya/epidemiología , Enfermedad de Moyamoya/terapia , Pakistán/epidemiología , Estudios Retrospectivos , Distribución por Sexo , Adulto Joven
9.
BMC Neurol ; 9: 58, 2009 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-19948076

RESUMEN

BACKGROUND: The burden of cerebrovascular disease in developing countries is rising sharply. The prevalence of established risk factors of stroke is exceptionally high in Pakistan. However, there is limited data on the burden of stroke and transient ischemic attack (TIA) in South Asia. We report the first such study conducted in an urban slum of Karachi, Pakistan. METHODS: Individuals 35 years of age or older were invited for participation in this investigation through simple random sampling. A structured face-to-face interview was conducted using a pre-tested stroke symptom questionnaire in each participant to screen for past stroke or TIA followed by neurological examination of suspected cases. Anthropometric measurements and random blood glucose levels were recorded. Multivariable logistic regression was used to determine the association of vascular risk factors with prevalence of stroke. RESULTS: Five hundred and forty five individuals (49.4% females) participated in the study with a response rate of 90.8%. One hundred and four individuals (19.1%) were observed to have a prior stroke while TIA was found in 53 individuals (9.7%). Overall, 119 individuals (21.8% with 66.4% females) had stroke and/or TIA. Female gender, old age, raised random blood glucose level and use of chewable tobacco were significantly associated with the prevalence of cerebrovascular disease. CONCLUSION: This is the first study demonstrating an alarmingly high life-time prevalence of cerebrovascular disease in Pakistan. Individual and public health interventions in Pakistan to increase awareness about stroke, its prevention and therapy are warranted.


Asunto(s)
Ataque Isquémico Transitorio/epidemiología , Accidente Cerebrovascular/epidemiología , Adulto , Distribución por Edad , Factores de Edad , Anciano , Anciano de 80 o más Años , Estudios Transversales , Femenino , Encuestas Epidemiológicas , Humanos , Masculino , Persona de Mediana Edad , Oportunidad Relativa , Pakistán/epidemiología , Prevalencia , Análisis de Regresión , Factores de Riesgo , Factores Sexuales , Encuestas y Cuestionarios
10.
BMC Cardiovasc Disord ; 9: 4, 2009 Jan 27.
Artículo en Inglés | MEDLINE | ID: mdl-19173721

RESUMEN

BACKGROUND: The use of omega-3 fatty acids is a currently proven strategy for secondary prevention of heart disease. The prescription practices for this important nutraceutical is not currently known. It is imperative to assess the knowledge of cardiologists regarding the benefits of omega-3 fatty acids and to determine the frequency of its prescription. The aim of the study was to determine the practices and associations of dietary fish prescribing among cardiologists of Karachi and to assess their knowledge of fish oil supplementation and attitudes toward dietary practices. METHODS: A cross sectional survey was conducted during the period of January to March, 2008. A self report questionnaire was employed. All practicing cardiologists of Karachi were included in the study. Multiple logistic regression analysis was performed to determine the independent factors associated with high fish prescribers. RESULTS: The sample comprised of a total of 163 cardiologists practicing in Karachi, Pakistan. Most (73.6%) of the cardiologists fell in the age range of 28-45 years and were male (90.8%). High fish prescribers only comprised 36.2% of the respondents. After adjusting for age and gender, multivariate analysis revealed that only the variable of knowledge about fish oil's role in reducing sudden cardiac death was independently associated with high fish prescribers OR = 6.38 [95% CI 2.58-15.78]. CONCLUSION: The level of knowledge about the benefits of omega-3 fatty acids is high and the cardiologists harbor a favorable attitude towards dispensing dietary fish advice. However, the prescription practices are less than optimal and not concordant with recommendations of organisations such as the American Heart Association and National Heart Foundation of Australia. The knowledge of prevention of sudden cardiac death in CVD patients has been identified as an important predictor of high fish prescription. This particular life-saving property of omega-3 fatty acids should be the focus of any implemented educational strategy targeted to improve secondary CVD prevention via omega-3 fatty acid supplementation.


Asunto(s)
Ácidos Grasos Omega-3/uso terapéutico , Aceites de Pescado/uso terapéutico , Cardiopatías/prevención & control , Adulto , American Heart Association , Cardiología/educación , Estudios Transversales , Suplementos Dietéticos/estadística & datos numéricos , Prescripciones de Medicamentos/estadística & datos numéricos , Femenino , Cardiopatías/metabolismo , Humanos , Masculino , Persona de Mediana Edad , Pakistán , Guías de Práctica Clínica como Asunto , Pautas de la Práctica en Medicina , Encuestas y Cuestionarios , Estados Unidos , Recursos Humanos
11.
J Pak Med Assoc ; 59(3): 173-6, 2009 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-19288947

RESUMEN

The aim of our study was to assess asthma control among asthmatics at a tertiary care setting in Karachi using ACT questionnaire. The ACT questionnaire was filled by known asthmatics in January 2007. A total of 150 questionnaires were filled of which, 61 (40%) were males and 89 (60%) females. Mean ACT score was 17.71 +/- 4.41. Association between sex and asthma control was not statistically significant. Significant association was seen with asthma control and Ipratropium bromide inhaler. Asthma control among patients at a tertiary care centre is moderate. ACT can be used to follow patients in the hospital.


Asunto(s)
Antiasmáticos/uso terapéutico , Asma/tratamiento farmacológico , Ipratropio/uso terapéutico , Administración por Inhalación , Asma/epidemiología , Broncodilatadores/uso terapéutico , Distribución de Chi-Cuadrado , Femenino , Encuestas Epidemiológicas , Humanos , Masculino , Pakistán
12.
J Pak Med Assoc ; 59(1): 30-4, 2009 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-19213374

RESUMEN

OBJECTIVE: The study aimed to determine the frequency of endometriosis in women who underwent diagnostic laparoscopy for evaluation of infertility and the association of clinical, ultrasonographic and laparoscopic findings of endometriosis with the laparoscopic stages of the disease. METHOD: It was a retrospective study of women presenting to gynaecologic clinics of the Aga Khan University Hospital from January 1999 to December 2005 with primary complaint of primary or secondary infertility and were diagnosed with endometriosis through laparoscopy. Relevant demographic and clinical information was entered and analyzed in SPSS version 14.0. RESULTS: The frequency of endometriosis in women with primary compliant of infertility was found to be 16.8%. Statistically significant associations was found between staging of the disease and thin built (p=0.007) and restricted uterine mobility on pelvic examination (p=0.035). The patients' ultrasound and laparoscopic examination showed significant association with staging of the disease with the presence of cysts on ultrasound (p-value < 0.0001) and adhesions on laparoscopy (p value <0.00001). CONCLUSION: The variability of the definition and inconsistency in diagnostic methods makes the prevalence of endometriosis difficult to determine and we might underestimate the true burden of the disease. Most of the signs and symptoms of endometriosis do not correlate with the severity (staging) of the disease. Hence, Laparoscopy remains the gold standard for diagnosis as well as staging of endometriosis.


Asunto(s)
Endometriosis/epidemiología , Infertilidad Femenina/epidemiología , Laparoscopía , Adolescente , Adulto , Progresión de la Enfermedad , Endometriosis/diagnóstico , Endometriosis/diagnóstico por imagen , Endometriosis/fisiopatología , Femenino , Humanos , Persona de Mediana Edad , Pakistán/epidemiología , Prevalencia , Estudios Retrospectivos , Ultrasonografía , Adulto Joven
13.
J Pak Med Assoc ; 59(9): 650-5, 2009 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-19750870

RESUMEN

OBJECTIVE: To objectively compare the differences in knowledge and practices regarding healthy lifestyle among medical and non-medical students of Karachi along with assessment of any perceived barriers. METHODS: This cross-sectional study included 350 students between ages 17-24 years from 6 private universities of Karachi--three medical and three non-medical Institutions. A self-reported questionnaire was employed to assess attitude and barriers to healthy practices among the simple random selection of students. RESULTS: On a 10-point scale, the average knowledge score of students on general and clinical nutritional knowledge was 5.7 +/- 1.51 and 4.4 +/- 1.77, respectively and the difference was statistically significant (p < 0.01). Conversely the diet and lifestyle score (85-point scale) among medical (41.3) and non medical students (40.8) was not significant (p = 0.646). There was no difference between the perception of medical and non-medical students regarding 'work-related stress' in their life. 'Lack of time' was cited as the most important reason for skipping meals and as a barrier to exercising regularly among both groups. CONCLUSION: The knowledge, attitudes and practices of medical students in Karachi suggest that superior knowledge about healthy lifestyle does not necessarily result into better practices.


Asunto(s)
Dieta , Conocimientos, Actitudes y Práctica en Salud , Estilo de Vida , Estudiantes de Medicina , Adulto , Estudios Transversales , Femenino , Humanos , Masculino , Pakistán , Estudiantes de Medicina/psicología , Estudiantes de Medicina/estadística & datos numéricos
14.
Cardiol Clin ; 37(4): 449-458, 2019 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-31587786

RESUMEN

With increasing survival from cancer, the incidence of cardiovascular diseases is increasing as a chronic side effect of radiation therapy. Prevention, early recognition, and prompt intervention should be the major focus in the care of these patients.


Asunto(s)
Enfermedades Cardiovasculares/etiología , Neoplasias/radioterapia , Cardiotoxicidad , Enfermedades Cardiovasculares/epidemiología , Relación Dosis-Respuesta en la Radiación , Salud Global , Humanos , Incidencia , Radioterapia/efectos adversos
15.
J Chromatogr B Analyt Technol Biomed Life Sci ; 1114-1115: 100-109, 2019 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-30947130

RESUMEN

The purpose of this study was to find the component of the Bifidobacterium cell wall more particularly the functional groups from peptidoglycan involved in the mechanism of binding with Benzo[a]pyrene. Additionally, the effect of different stress factors (acid, heat, alkaline, oxidative, osmotic, enzymatic, and detergent factors) on the functional group and the overall binding mechanism of Bifidobacterium with B[a]p were also evaluated. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) were used to explain the binding mechanism of Bifidobacterium with B[a]p along with HPLC (high-performance liquid chromatography). The peptidoglycan-B[a]p complexes were highly stable after benzene washing. Peptidoglycan from Bifidobacterium infantis BY12 showed highest binding rate with B[a]p out of nine selected strains. FTIR spectra showed that the main functional groups involved in B[a]p binding were CO, OH and/or NH. FTIR spectrums along with SEM electrographs as a function of stress factors reveal that peptidoglycan structural integrity is important in B[a]p binding. Bifidobacterium longum subsp. infantis BY12 may be employed as a biological detoxification agent for the elimination of B[a]p from human diet and animal feed in the future.


Asunto(s)
Benzo(a)pireno/metabolismo , Bifidobacterium/citología , Bifidobacterium/metabolismo , Peptidoglicano/metabolismo , Benzo(a)pireno/análisis , Bifidobacterium/química , Bifidobacterium/fisiología , Peptidoglicano/química , Probióticos , Espectroscopía Infrarroja por Transformada de Fourier , Estrés Fisiológico
16.
Cureus ; 11(3): e4234, 2019 Mar 11.
Artículo en Inglés | MEDLINE | ID: mdl-31123656

RESUMEN

Objective To assess the knowledge, attitude, and practices (KAP) related to cervical cancer among the adult women of Azad Kashmir, Pakistan. Methods A cross-sectional study, involving 594 patients visiting the Gynecology and Obstetrics outpatient departments of Khalifa bin Zayed Hospital, Rawalakot, Azad Kashmir, Pakistan, was done. The study questionnaire (interviewer-administered) included 26 items to measure the knowledge, attitude, and practices related to cervical cancer and was formulated and validated with the help of gynecologists and epidemiologists. Descriptive statistics were used to present the knowledge, attitude, and practice level of respondents. The respondents' knowledge, attitude, and practice score was compared across gender and level of education. Data analysis was done using SPSS v 23.0 (IBM Corporation, Armonk, NY, US) at 95% CI. Results A total of 346 (58.2%) women heard about cervical cancer and 210 (35.4%) women heard about the pap smear test. Thirty-five women (5.9%) underwent a pap smear test in their lifetime. More than half (51.7%) thought that undergoing a pap smear test is embarrassing. But 382 respondents (64.3%) will undergo a pap smear test if the test is provided free of cost. Unmarried women had a better KAP score as compared to married women (13.58±5.14 vs 9.12±4.04, p<.001). The KAP score was significantly different in respondents with different levels of education (p<.001). Conclusion This study showed a better KAP score as compared to previous Pakistani studies but, still, there is plenty of room to improve. Women of developed countries have significantly better knowledge, attitude, and practices related to cervical cancer. Local authorities may run a free pap smear screening program in communities to detect cervical cancer early.

17.
J Pak Med Assoc ; 58(8): 421-6, 2008 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-18822637

RESUMEN

OBJECTIVE: To determine predictors of need for transfusion of blood and blood products and create a clinical predictive model to reduce indiscriminate use of blood products during surgery. METHOD: We conducted a retrospective chart review of 485 patients who underwent coronary artery bypass surgery from January 2004 to December 2004 at a Tertiary Care Hospital in Karachi, Pakistan. Independent predictors associated with transfusion were identified and a clinical prediction model developed. RESULTS: The transfusion rate was 37.1%. A predictive model was created based on the presence of pulmonary disease, diabetes mellitus, low ejection fraction and recent/ongoing myocardial infarction. CONCLUSION: The study identifies some predictors of need for blood transfusion in patients undergoing Coronary Artery Bypass Grafting. However, prospective studies with a larger sample of patients are needed to determine other predictors and their applicability in patient selection across institutions.


Asunto(s)
Transfusión Sanguínea/métodos , Puente de Arteria Coronaria/métodos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Modelos Estadísticos , Modelos Teóricos , Pakistán , Valor Predictivo de las Pruebas , Estudios Retrospectivos
18.
Am J Clin Oncol ; 40(5): 444-450, 2017 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26017484

RESUMEN

BACKGROUND: We compared the safety and efficacy of ipilimumab and stereotactic radiosurgery (SRS) to SRS alone for newly diagnosed melanoma brain metastases (MBM). MATERIALS AND METHODS: We reviewed records of newly diagnosed MBM patients treated with SRS from 2009 to 2013. The primary endpoint of overall survival (OS), and secondary endpoints of local control, distant intracranial failure, and radiation necrosis were compared using Kaplan-Meier method. Univariate and multivariate analysis were performed using the Cox proportional hazards method. RESULTS: Fifty-four consecutive MBM patients were identified, with 20 (37.0%) receiving ipilimumab within 4 months of SRS. Ipilimumab-treated and non-ipilimumab-treated patients had similar baseline characteristics. No difference in symptomatic radiation necrosis or hemorrhage was identified between cohorts. Compared with patients in the nonipilimumab group, 1 year local control (71.4% vs. 92.3%, P=0.40) and intracranial control (12.7% vs. 29.1%, P=0.59) were also statistically similar. The ipilimumab cohort also had no difference in 1-year OS (37.1% vs. 38.5%, P=0.84). Patients administered ipilimumab within 14 days of SRS had higher 1-year (42.9%) and 2-year OS (42.9%) relative to ipilimumab delivered >14 days (33.8%, 16.9%) and SRS alone (38.5%, 25.7%) but these difference were not statistically significant. Univariate analysis and multivariate analysis both confirmed single brain metastasis, controlled primary, and active systemic disease as predictors for OS. CONCLUSIONS: Use of ipilimumab within 4 months of SRS seems to be safe, with no increase in radiation necrosis or hemorrhage; however, our retrospective institutional experience with this treatment regimen was not associated with improved outcomes.


Asunto(s)
Anticuerpos Monoclonales/uso terapéutico , Antineoplásicos/uso terapéutico , Neoplasias Encefálicas/radioterapia , Melanoma/patología , Neoplasias Cutáneas/patología , Adulto , Anciano , Anciano de 80 o más Años , Anticuerpos Monoclonales/efectos adversos , Antineoplásicos/efectos adversos , Neoplasias Encefálicas/tratamiento farmacológico , Neoplasias Encefálicas/mortalidad , Neoplasias Encefálicas/secundario , Femenino , Humanos , Ipilimumab , Masculino , Melanoma/tratamiento farmacológico , Melanoma/mortalidad , Persona de Mediana Edad , Traumatismos por Radiación/etiología , Radiocirugia/efectos adversos , Radiocirugia/métodos , Neoplasias Cutáneas/tratamiento farmacológico , Neoplasias Cutáneas/mortalidad , Análisis de Supervivencia , Resultado del Tratamiento
19.
J Pak Med Assoc ; 56(11): 506-8, 2006 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17183977

RESUMEN

Cerebral venous sinus thrombosis is a disorder with a unique pathophysiology which needs to be described. A Medline search of all articles detailing pathophysiology of CVST was done, using keywords: cerebral venous thrombosis and pathophysiology. In addition, major texts were reviewed for additional references. The pathophysiology of CVST depends on two interconnected events, local signs due to venous infarct, e.g., hemiparesis and global signs due to raised ICP from an obstructed venous system--papilloedema and isolated intracranial hypertension being one of them. Pathophysiology of CVST is diverse and makes it easier to understand the diversity of clinical presentations.


Asunto(s)
Venas Cerebrales/patología , Trombosis Intracraneal/fisiopatología , Trombosis de los Senos Intracraneales/fisiopatología , Trombosis de la Vena/fisiopatología , Humanos , Trombosis Intracraneal/etiología , Pronóstico , Factores de Riesgo , Trombosis de los Senos Intracraneales/etiología , Trombosis de la Vena/etiología
20.
J Pak Med Assoc ; 56(11): 557-9, 2006 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17183992

RESUMEN

Cerebral Venous Sinus thrombosis may rarely be isolated to a cortical vein or to the deep venous system. When the deep venous system is involved, prognosis is generally poor. In addition, long term follow up is not reported. We conducted a retrospective review of all patients admitted to a major tertiary care center, with the diagnosis of isolated deep venous thrombosis. Two patients were identified with isolated involvement of the deep venous system, they are reviewed in detail with long term follow up. Two young South Asian women in their thirties with rapid onset of neurologic signs and symptoms are reported. Even when one patient required intubation and mechanical ventilation for stupor, both had excellent neurologic recovery. Over 6 years of follow up there has been no recurrence. In spite of stupor at presentation, complete recovery is possible without long term recurrence.


Asunto(s)
Anticoagulantes/uso terapéutico , Venas Cerebrales/patología , Senos Craneales/patología , Heparina/uso terapéutico , Trombosis de los Senos Intracraneales/tratamiento farmacológico , Trombosis de la Vena/tratamiento farmacológico , Adulto , Femenino , Humanos , Pronóstico , Trombosis de los Senos Intracraneales/diagnóstico , Trombosis de la Vena/diagnóstico
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