Morbid Adherent Placenta (MAP)/Placenta Accreta Spectrum (PAS) is a serious diagnosis which has a risk of complications. Ultrasound scan helps in early diagnosis and has great value in further confirmation and follow ...Morbid Adherent Placenta (MAP)/Placenta Accreta Spectrum (PAS) is a serious diagnosis which has a risk of complications. Ultrasound scan helps in early diagnosis and has great value in further confirmation and follow up. Observed new clinical sign and associated clinical triad are discussed here.展开更多
Wideband multiple-input multiple-output (MIMO) channel measurements were performed at5.25GHz in the hotspot environment in Beijing.The propagation mechanism was line-of-sight and ob-structed-line-of-sight (LOS/OLOS) i...Wideband multiple-input multiple-output (MIMO) channel measurements were performed at5.25GHz in the hotspot environment in Beijing.The propagation mechanism was line-of-sight and ob-structed-line-of-sight (LOS/OLOS) in the outdoor scenario.Using a large amount of estimated angle ofdeparture (AoD) and angle of arrival (AoA) results,the cumulative distribution functions (CDFs) of di-rectional spread (DS) are extracted,which illustrate that the spatial dispersion is quite significant at bothends due to the low antenna height of base station and rich scatterers.The average power azimuth spec-trum (PAS) is found to be well fitted with a Laplacian function.In addition,the non-isotropic property ofspatial correlation is investigated,and the average envelop correlation over arbitrary antenna spacing pro-vides the correlation distance to facilitate the MIMO optimization and deployment in the outdoor hotspotenvironment.展开更多
Introduction: Hemorrhage is one of the most common causes of maternal morbidity and mortality. This study was conducted to investigate how much abnormal placentation can affect blood bank capacity and to measure the b...Introduction: Hemorrhage is one of the most common causes of maternal morbidity and mortality. This study was conducted to investigate how much abnormal placentation can affect blood bank capacity and to measure the burden on the blood bank caused by excessive use of blood and blood products. Methodology: This is a retrospective study conducted at King Saud Medical City Maternity Hospital in Riyadh, Kingdom of Saudi Arabia, from January 2019-September 2020. It includes 170 cases diagnosed with abnormal placentation (low-lying placenta or placenta previa, accreta, increta, or percreta). The primary purpose was to measure consumption of blood and blood products in cases of placental abnormalities and to investigate how much this affects blood bank capacity. A secondary aim was to report rates of admission to the ICU and maternal mortality. Results: This study included 170 women with placental abnormalities. Placental previa had occurred in 96 cases, followed by placenta accreta in 46 cases, placenta increta in 13 cases, placenta percreta in 8 cases, and low-lying placenta in 7 cases. Most patients (93) were treated with a Bakri balloon to prevent hemorrhage, but 38 patients had a hysterectomy. The average estimation of blood loss was 2210 ml, with no maternal mortality. An average of 3.39 units of packed red blood cells (PRBC) with a maximum of 20 units, 2.12 units of fresh frozen plasma (FFP) with a maximum of 20 units, and 0.7 units of packed platelets (PP) with maximum of 12 units consumed per patient. Eighty-seven patients (51.2%) were admitted to the ICU and 83 others (48.8%) were admitted to the high dependency unit. Conclusion:<span style="font-family: "> Blood and blood product volumes had a linear relationship with the severity of placental abnormalities and estimated blood loss. Therefore, blood bank services should be available to save mothers’ life.展开更多
Posterior placenta accreta spectrum(PAS)disorders are infrequent but potentially associated with significant maternal mortality and morbidity,especially if not diagnosed prenatally.Analysis of published literature is ...Posterior placenta accreta spectrum(PAS)disorders are infrequent but potentially associated with significant maternal mortality and morbidity,especially if not diagnosed prenatally.Analysis of published literature is problematic since most experiences included only a few cases.Knowledge of the risk factors associated with posterior PAS is crucial to identifying mothers at higher risk and ask for high sensitivity studies.Ultrasound has poor diagnostic accuracy in detecting posterior PAS,while magnetic resonance imaging better delineates the posterior uterine wall.In comparison,prenatal imaging’s diagnostic performance in detecting posterior PAS is significantly lower than anterior placenta invasion.Management of posterior PAS depends on several factors,including maternal hemodynamic status,available resources,clinical presentation,and invasion severity.For accreta or increta cases,a compression suture is habitually enough to perform hemostasis.Nevertheless,organ involvement habitually requires a multidisciplinary team with the assistant of a general or coloproctology surgeon.The present article aims to update the risk factors,prenatal diagnosis,and surgical management of pregnancies complicated by posterior PAS.展开更多
文摘Morbid Adherent Placenta (MAP)/Placenta Accreta Spectrum (PAS) is a serious diagnosis which has a risk of complications. Ultrasound scan helps in early diagnosis and has great value in further confirmation and follow up. Observed new clinical sign and associated clinical triad are discussed here.
基金the National High Technology Research and Development Programme of China(No.2006AA01Z258)
文摘Wideband multiple-input multiple-output (MIMO) channel measurements were performed at5.25GHz in the hotspot environment in Beijing.The propagation mechanism was line-of-sight and ob-structed-line-of-sight (LOS/OLOS) in the outdoor scenario.Using a large amount of estimated angle ofdeparture (AoD) and angle of arrival (AoA) results,the cumulative distribution functions (CDFs) of di-rectional spread (DS) are extracted,which illustrate that the spatial dispersion is quite significant at bothends due to the low antenna height of base station and rich scatterers.The average power azimuth spec-trum (PAS) is found to be well fitted with a Laplacian function.In addition,the non-isotropic property ofspatial correlation is investigated,and the average envelop correlation over arbitrary antenna spacing pro-vides the correlation distance to facilitate the MIMO optimization and deployment in the outdoor hotspotenvironment.
文摘Introduction: Hemorrhage is one of the most common causes of maternal morbidity and mortality. This study was conducted to investigate how much abnormal placentation can affect blood bank capacity and to measure the burden on the blood bank caused by excessive use of blood and blood products. Methodology: This is a retrospective study conducted at King Saud Medical City Maternity Hospital in Riyadh, Kingdom of Saudi Arabia, from January 2019-September 2020. It includes 170 cases diagnosed with abnormal placentation (low-lying placenta or placenta previa, accreta, increta, or percreta). The primary purpose was to measure consumption of blood and blood products in cases of placental abnormalities and to investigate how much this affects blood bank capacity. A secondary aim was to report rates of admission to the ICU and maternal mortality. Results: This study included 170 women with placental abnormalities. Placental previa had occurred in 96 cases, followed by placenta accreta in 46 cases, placenta increta in 13 cases, placenta percreta in 8 cases, and low-lying placenta in 7 cases. Most patients (93) were treated with a Bakri balloon to prevent hemorrhage, but 38 patients had a hysterectomy. The average estimation of blood loss was 2210 ml, with no maternal mortality. An average of 3.39 units of packed red blood cells (PRBC) with a maximum of 20 units, 2.12 units of fresh frozen plasma (FFP) with a maximum of 20 units, and 0.7 units of packed platelets (PP) with maximum of 12 units consumed per patient. Eighty-seven patients (51.2%) were admitted to the ICU and 83 others (48.8%) were admitted to the high dependency unit. Conclusion:<span style="font-family: "> Blood and blood product volumes had a linear relationship with the severity of placental abnormalities and estimated blood loss. Therefore, blood bank services should be available to save mothers’ life.
文摘Posterior placenta accreta spectrum(PAS)disorders are infrequent but potentially associated with significant maternal mortality and morbidity,especially if not diagnosed prenatally.Analysis of published literature is problematic since most experiences included only a few cases.Knowledge of the risk factors associated with posterior PAS is crucial to identifying mothers at higher risk and ask for high sensitivity studies.Ultrasound has poor diagnostic accuracy in detecting posterior PAS,while magnetic resonance imaging better delineates the posterior uterine wall.In comparison,prenatal imaging’s diagnostic performance in detecting posterior PAS is significantly lower than anterior placenta invasion.Management of posterior PAS depends on several factors,including maternal hemodynamic status,available resources,clinical presentation,and invasion severity.For accreta or increta cases,a compression suture is habitually enough to perform hemostasis.Nevertheless,organ involvement habitually requires a multidisciplinary team with the assistant of a general or coloproctology surgeon.The present article aims to update the risk factors,prenatal diagnosis,and surgical management of pregnancies complicated by posterior PAS.
