What is the Epidemiology of SMA Syndrome?

Discussion Superior mesenteric artery syndrome (SMAS) is caused by the compression of the superior mesenteric artery (SMA) against the 3rd part of the duodenum creating a proximal intestinal obstruction. It is relatively rare and can be hard to distinguish from other causes of intestinal obstruction. Normally the SMA arises from the anterior aorta around the L1 vertebra. It extends anteriorly and caudally into the mesentery of the small bowel. The angle between the SMA and aorta is called the aortomesenteric angle and is usually 38-65°. The distance between the SMA and aorta is usually 10-20 mm. Within the aortomesenteric angle lies the 3rd part of the duodenum and left renal artery along with a fat pad. The fat pad is felt to cushion the other organs and helps maintain the aortomesenteric angle. If the fat in this area is lost, then the angle decreases and compresses the duodenum and if the compression is severe enough then obstruction can occur. The left renal vein can also be compromised. In SMAS the angle is usually 6-25° and the distance between the SMA and aorta is 2-8 mm. Interestingly though, while most patients have a recognizable reason for the SMAS there are also a group of patients who have normal weight. SMAS can also occur after spinal surgeries where the spine is straightened. This causes increased tension on the mesentery and SMA, which again decreases the angle and therefore can cause duodenal compression and/or obstruction. SMAS usually presents wi...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news

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Source: Gastroenterology Research and Practice - Category: Gastroenterology Tags: Gastroenterol Res Pract Source Type: research
CONCLUSION: MRI in combination with the presented workflow may be used in edentulous cases for guided implant surgery. Further studies are needed to prove the promising accuracy of this alternative approach in clinical trials. PMID: 30883626 [PubMed - in process]
Source: International Journal of Oral and Maxillofacial Implants - Category: ENT & OMF Tags: Int J Oral Maxillofac Implants Source Type: research
Authors: Chen Z, Li J, Wang HL, Yu H Abstract PURPOSE: The aim of this cone beam computed tomography (CBCT) study was to assess bone volume changes in molar sites after modified immediate implant placement with xenografts. MATERIALS AND METHODS: This prospective study was performed between June 2015 and September 2016. Surgical procedures included modified implant site preparation, atraumatic tooth extraction, implant placement, and bone grafting with deproteinized bovine bone mineral. CBCT scans were taken at the day of surgery and 6 months after surgery. Horizontal and vertical bone dimensional changes were e...
Source: International Journal of Oral and Maxillofacial Implants - Category: ENT & OMF Tags: Int J Oral Maxillofac Implants Source Type: research
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Source: International Journal of Oral and Maxillofacial Implants - Category: ENT & OMF Tags: Int J Oral Maxillofac Implants Source Type: research
AbstractTuberculosis, smoking, and alcohol drinking are major public health and social issues worldwide. We investigated the joint effect of smoking plus alcohol drinking on TB treatment. Retrospective study was conducted among TB patients in 49  units from eight provinces in China. All patients enrolled were classified into four groups according to their smoking and/or alcohol status. Current smokers plus drinkers belonged to group 1; ex-smokers plus ex-drinkers were in group 2; current smokers and ex-drinkers, current smokers and never d rinkers, ex-smokers and current drinkers, ex-smokers and never drinkers, never ...
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In this study, an annular high intensity focused ultrasound (HIFU) array transducer was developed to suppress the level of sidelobes below a given requirement with a minimum number of channels. The electrode patterns analyzed for the transducer were equal electrode area pattern and variable electrode width pattern. In finite element analysis of the transducer performance, the variable electrode width pattern transducer was proven to be able to suppress the level of sidelobes below -12 dB with 9 channels, while the equal electrode area pattern transducer required at least 10 channels to suppress the level of sidelobe...
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Source: Biomedical and Environmental Sciences - Category: Biomedical Science Source Type: research
Authors: Bai F, Ma Y, Guo H, Li Y, Xu F, Zhang M, Dong H, Deng J, Xiong L Abstract The concept of "acupoint sensitization" refers to the functional status of acupoint switches from silent to active under pathological conditions. In clinic, acupoint sensitization provides important guidance for acupoints selection in different diseases. However, the mechanism behind this phenomenon remains unclear. We generated a model of knee osteoarthritis (KOA) by intra-articular injection of monosodium iodoacetate (MIA) into the left knee of rats. The paw withdrawal mechanical threshold (PWMT) and the total number of m...
Source: Evidence-based Complementary and Alternative Medicine - Category: Complementary Medicine Tags: Evid Based Complement Alternat Med Source Type: research
This study examined the effects of ultrasonic power (0, 120, 360, and 600 W) for 30 min on the structural, physicochemical and emulsifying properties of whey protein isolate (WPI) under different pH values (3, 5, 7, 9 and 11). The particle size distributions of WPI narrowed as the ultrasonic power increased from 0 to 600 W. WPI showed the maximum surface hydrophobicity and fluorescence intensity at 600 W and pH 11. Ultrasound significantly reduced the WPI turbidity at pH 3, 7, 9 and 11 and improved the WPI emulsion activity and stability at pH 3, 5, 7 and 9. Moreover, the number of β-sheets...
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Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research
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