Sumaira Khan

Objective: To assess the impact of fetal echocardiography in altering the course of action for neonatal cardiac expertise and services available in Pakistan following an antenatal diagnosis of congenital heart defect (CHD). Study Design: Cross-sectional study. Place and Duration of Study: Pediatric Cardiology Unit, Armed Forces Institute of Cardiology & National Institute of Heart Diseases, Rawalpindi Pakistan, from Feb 2020 to Sep 2021. Methodology: Fetuses aged 18 to 38 weeks of gestational age referred to the Pediatric Cardiac Unit due to risk of or suspicion of congenital heart disease underwent fetal cardiac echo. Data were collected and reviewed retrospectively to seek any impact of the antenatal diagnosis on post-natal planning. Results: The mean age of the mothers was 29.79±5.24 years (range, 17-47 years), and the mean gestational age at which the fetal echocardiography examination was performed was 27.29±4.47weeks (range: 12–38 years). Of the 609 pregnancies, fetal echocardiogram evaluation was performed, and sixty-three (10.3%) fetal echocardiograms were abnormal. Of the 63, only 06(9.5%) returned to the neonatal cardiac unit for follow-up and treatment in the first ten days of life. Conclusion: The real impact of fetal echocardiography is possible only with the availability of well-developed, readily accessible fetal and neonatal cardiac services. Poverty and a struggling healthcare infrastructure confound the benefits.

In the present study, an indigenous biosorbent (leaves of Tecomella undulata) was used for the simultaneous removal of inorganic arsenic species (As^III and As^V) from the stored rainwater in Tharparkar, Pakistan. The Plackett–Burman experimental design was used as a multivariate strategy for the evaluation of the effects of six factors/variables on the biosorption of inorganic arsenic species, simultaneously. Central composite design (CCD) was used to found the optimum values of significant factors for the removal of As^III and As^V. Initial concentrations of both inorganic As species, pH, biosorbent dose, and contact time were selected as independent factors in CCD, while the adsorption capacity (q _e) was considered as a response function. The separation of inorganic As species in water samples before and after biosorption was carried out by cloud point and solid-phase extraction methods. Theoretical values of pH, concentration of analytes, biosorbent dose, and contact time were calculated by quadratic equation for 100 % biosorption of both inorganic As species in aqueous media. Experimental data were modeled by Langmuir and Freundlich isotherms. Thermodynamic and kinetic study indicated that the biosorption of As^III and As^V was followed by pseudo second order. It was concluded that the indigenous biosorbent material efficiently and simultaneously removed both As species in the range of 70.8 to 98.5 % of total contents in studied ground water samples. Optimizing the significant varable by central 2³ + star orthogonal composite design

The present study was aimed to evaluate the cadmium (Cd) and lead (Pb) levels in the blood samples of adolescent boys, chewing different smokeless tobacco (SLT) products in Pakistan. For comparative purpose, boys of the same age group (12–15 years), not consumed any SLT products were selected as referents. To determine trace levels of Cd and Pb in blood samples, a preconcentration method, vortex-assisted liquid–liquid microextraction (VLLME) has been developed, prior to analysis by flame atomic absorption spectrometry. The hydrophobic chelates of Cd and Pb with ammonium pyrrolidinedithiocarbamate were extracted into the fine droplets of ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate, while nonionic surfactant, Triton X-114 was used as a dispersing medium. The main factors affecting the recoveries of Cd and Pb, such as concentration of APDC, centrifugation time, volume of IL and TX-114, were investigated in detail. It was also observed that adolescent boys who consumed different SLT products have 2- to 3-fold higher levels of Cd and Pb in their blood samples as compared to referent boys (p < 0.001).

The current work develops a new green methodology for the separation/preconcentration of cadmium ions (Cd²⁺) using room temperature ionic liquid-dispersive liquid phase microextraction (RTIL–DLME) prior to analysis by flame atomic absorption spectrometry with microsample introduction system. Room temperature ionic liquids (RTIL) are considered “Green Solvents” for their thermally stable and non-volatile properties, here 1-butyl-3-methylimidazolium hexafluorophosphate [C₄mim][PF₆] was used as an extractant. The preconcentration of Cd²⁺ in different waters and acid digested scalp hair samples were complexed with 1-(2-pyridylazo)-2-naphthol and extracted into the fine drops of RTILs. Some significant factors influencing the extraction efficiency of Cd²⁺ and its subsequent determination, including pH, amount of ligand, volume of RTIL, dispersant solvent, sample volume, temperature, and incubation time were investigated in detail. The limit of detection and the enhancement factor under the optimal conditions were 0.05 μg/L and 50, respectively. The relative standard deviation of 100 μg/L Cd²⁺ was 4.3 %. The validity of the proposed method was checked by determining Cd²⁺ in certified reference material (TM-25.3 fortified water). The sufficient recovery (>98 %) of Cd²⁺ with the certified value. The mean concentrations of Cd in lake water 13.2, waste water 15.7 and hair sample 16.8 μg/L, respectively and the developed method was applied satisfactorily to the preconcentration and determination of Cd²⁺ in real samples.