Low Complexity V-BLAST MIMO-OFDM Detector by Successive Iterations Reduction

V-BLAST detection method suffers large computational complexity due to its successive detection of symbols. In this paper, we propose a modified V-BLAST algorithm to decrease the computational complexity by reducing the number of detection iterations required in MIMO communication systems. We begin by showing the existence of a maximum number of iterations, beyond which, no significant improvement is obtained. We establish a criterion for the number of maximum effective iterations. We propose a modified algorithm that uses the measured SNR to dynamically set the number of iterations to achieve an acceptable bit-error rate. Then, we replace the feedback algorithm with an approximate linear function to reduce the complexity. Simulations show that significant reduction in computational complexity is achieved compared to the ordinary V-BLAST, while maintaining a good BER performance.Comment: 6 pages, 7 figures, 2 tables. The final publication is available at www.aece.r

Use of Foley\u27s catheter balloon tamponade to control placental site bleeding resulting from major placenta previa during cesarean section

Aim: To evaluate the effect of 2-way Foley\u27s catheter balloon tamponade on controlling immediate postpartum hemorrhage (PPH) in cases of major placenta previa during cesarean section (CS). Methods: We evaluated women with placenta previa from May to November 2015. Women with immediate PPH during CS due to major placenta previa were managed by 2-way Foley\u27s catheter balloon tamponade when medical treatment failed, and before any surgical intervention. Results: Twenty patients, had major placenta previa, were delivered by elective CS and complicated by immediate PPH. Three placenta accreta patients (15%) underwent hysterectomy, 17 (85%) were managed by the 2-way Foley\u27s catheter balloon tamponade. In two patients, Foley\u27s catheter balloon failed to control bleeding and hysterectomy was done immediately. However, Foley\u27s catheter balloon successfully treated the remaining 15 patients. The median bleeding during the operation was 1522.5 (± 619.29) ml. None of them presented complications related to this procedure or required any further invasive surgery. Conclusion: The 2-way Foley\u27s catheter tamponade could be an option to control immediate postpartum hemorrhage resulting from major placenta previa during the cesarean section. This method is simple, cheap, nearly non-invasive and should be considered to reduce the risk of peripartum hysterectomy

Polycystic kidney disease with unilateral ventriculomegaly: a case report

Polycystic Kidney Disease (PKD) is an autosomal recessive disease with an incidence of about 1 in 30 000 births. It characterized by multiple cysts which filled by fluid that can ultimately impede kidney function leading to degeneration of renal tissue and renal failure. Oligo or anhydramnios is frequently present but not invariably so, suggesting that some degree of renal function is retained in some PKD cases. We present a 30 year old woman, gravida 5, para 4, at 22 weeks of gestation with ultrasound findings of autosomal recessive PKD, unilateral ventriculomegaly and marked oligohydramnios. Ventriculomegaly is a brain condition that occurs when the width of the atrium of the lateral ventricle is greater than 10 mm and occurs in 0.3-1.5 births per 1000. The association between autosomal recessive PKD and unilateral ventriculomegaly is not well understood and needs further evaluation

Polycystic kidney disease with unilateral ventriculomegaly: a case report

Polycystic Kidney Disease (PKD) is an autosomal recessive disease with an incidence of about 1 in 30 000 births. It characterized by multiple cysts which filled by fluid that can ultimately impede kidney function leading to degeneration of renal tissue and renal failure. Oligo or anhydramnios is frequently present but not invariably so, suggesting that some degree of renal function is retained in some PKD cases. We present a 30 year old woman, gravida 5, para 4, at 22 weeks of gestation with ultrasound findings of autosomal recessive PKD, unilateral ventriculomegaly and marked oligohydramnios. Ventriculomegaly is a brain condition that occurs when the width of the atrium of the lateral ventricle is greater than 10 mm and occurs in 0.3-1.5 births per 1000. The association between autosomal recessive PKD and unilateral ventriculomegaly is not well understood and needs further evaluation

Uterus didelphys with multiple fibroids: A case report

Uterine anomalies are congenital malformations caused by fusion or resorption defects during embryogenesis. Uterus didelphys, or a double uterus, is a rare condition that occurs in female fetuses as they develop in the womb. Here we report a case of a 46 year old virginal female with uterus didelphys along with multiple fibroids of both uteri and a right ovarian cyst. The patient underwent a total abdominal hysterectomy with adnexa removal. The specimen showed leiomyoma of uterus with ovarian endometriosis

Uterus didelphys with multiple fibroids: A case report

Uterine anomalies are congenital malformations caused by fusion or resorption defects during embryogenesis. Uterus didelphys, or a double uterus, is a rare condition that occurs in female fetuses as they develop in the womb. Here we report a case of a 46 year old virginal female with uterus didelphys along with multiple fibroids of both uteri and a right ovarian cyst. The patient underwent a total abdominal hysterectomy with adnexa removal. The specimen showed leiomyoma of uterus with ovarian endometriosis

The unexpected presence of a huge cystic hygroma with thanatophoric dysplasia type I: a case report

Introduction: The presence of a thin-walled, multicystic structure posterior to the fetal head and neck with an intact vertebral column is known as a cystic hygroma. Thanatophoric dysplasia is the most lethal skeletal dysplasia. Thanatophoric dysplasia (TD) is an autosomal dominant disorder with two phenotypes. TD type I is characterized by a normal shaped skull with bowed femurs and micromelia, while TD type II is characterized by straight femurs with a clover-leaf deformity of the skull and micromelia. We report here a case of thanatophoric dysplasia type I associated with cystic hygroma, this association needs further evaluation. Case history: A 30 year old woman was referred at 26 weeks of gestation because of marked polyhydramnios. Ultrasonographic examination of the fetus revealed a narrow chest, protuberant abdomen, short curved femur, normal shaped skull with accidentally cystic hygroma were present. No other anomalies were detected. We explained to the patient the nature and severity of the anomaly and the patient preferred the termination of pregnancy. Induction of abortion was done successfully. Conclusion: This case report has highlighted the association between cystic hygroma and thanatophoric dysplasia type I. To our knowledge, this is the first report in the literature reporting the association of cystic hygroma and thanatophoric dysplasia type I. We believe that this case is useful for obstetricians and pediatricians. We also highly recommend the genetic evaluation of the fetus and parents

Serum Asymmetric Dimethylarginine, and Adiponectin as Predictors of Atherosclerotic Risk among Obese Egyptian Children

BACKGROUND: Obesity is associated with an increased risk of developing hyperinsulinemia, dyslipidemia, hypertension, premature atherosclerosis, and coronary artery disease in the future.AIM: This study is designed to assess the relationship between serum adiponectin, asymmetric dimethylarginine (ADMA), and lipid profile among Egyptian overweight and obese children.METHODS: This cross sectional case control study included 40 selected pre-pubertal overweight and obese children, 24 girls (60%) and 16 boys (40%) aged between 5 to 13 years (8.85 ± 2.7 years), from new cases attending the National nutrition institute clinic during 2013. Forty apparently healthy children of matched age and sex were recruited as a control group.RESULTS: Obese group showed highly significant higher levels of serum ADMA, triglycerides, and total cholesterol compared with healthy controls (P <0.000 in all). However, serum adiponectin levels were highly significant lower in obese children compared to healthy controls (P < 0.000). Serum ADMA showed significant positive correlations with height, serum total cholesterol and serum triglycerides levels and significant negative correlation with the body mass index and weight for age z score.  Serum adiponectin showed significant negative correlations with BMI, weight, and weight for age z score and significant positive correlation with serum triglycerides. By linear regression analysis; serum adiponectin, and serum triglycerides levels were significant predictors of high serum ADMA level (p =0.045 and 0.015 respectively). BMI, weight, height and serum triglycerides were significant predictors of low serum adiponectin levels (p = 0.005, 0.022, 0.026 and 0.015 respectively).CONCLUSIONS: Our results revealed that ADMA, Adiponectin and lipid profile can be considered as predictive biomarkers in prediction and prevention of atherosclerotic risk in the future among overweight and obese Egyptian children

Twin pregnancy with complete hydatidiform mole and coexisting fetus following ovulation induction with a non-prescribed clomiphene citrate regimen: a case report

<p>Abstract</p> <p>Introduction</p> <p>Twin pregnancy with complete hydatidiform mole represents a very rare obstetric problem. Management of such cases is always problematic because the possibility of fetal survival should always be weighed against the risk of complications of molar pregnancy.</p> <p>Case presentation</p> <p>A 34-year-old Caucasian woman presented to our center with mild vaginal bleeding. Our patient was 16 weeks pregnant after a seven-year period of primary infertility. She became pregnant following a non-prescribed regimen of clomiphene citrate extending from the second day to the 13th day of her last cycle. A transabdominal ultrasound examination revealed a twin pregnancy with complete hydatidiform mole and a coexisting fetus. Serum β human chorionic gonadotropin was falsely low as identified by serial dilution of the sample (the 'hook effect'). Our patient refused termination of pregnancy and she was hospitalized for strict observation and follow-up. Unfortunately, she developed an attack of severe vaginal bleeding and a hysterotomy was performed. The fetus died shortly after birth.</p> <p>Conclusions</p> <p>Twin pregnancy with complete hydatidiform mole represents a matter of controversy. We suggest that conservation should always be considered whenever tertiary care services and strict observation are available.</p