Emergent Endoscopy for Esophageal Foreign Body Removal: The Impact of Location.

Background Timely intervention is essential for the successful removal of ingested foreign bodies. Emergent endoscopy (EGD) is usually performed in the emergency department (ED), operating room (OR), intensive care unit (ICU), or endoscopy suite. However, because the endoscopy suite is not always available, this study investigated the impact of location outside of the endoscopy suite on the successful removal of ingested foreign bodies and other patient outcomes. Methodology We reviewed charts of patients who underwent EGD for foreign body removal at an academic quaternary center between January 01, 2012, and December 31, 2020. We defined successful EGD as retrieval of the foreign body at the first attempt and not requiring subsequent endoscopy or surgical intervention. We performed descriptive and inferential statistical analyses and conducted classification and regression trees to compare endoscopy procedure length (EPL) and hospital length of stay (HLOS) between different locations. Results We analyzed 77 patients, of whom 13 (17%) underwent endoscopy in the ICU, 46 (60%) in the OR, and 18 (23%) in the ED. Endoscopic removal failed in four (5%) patients. Endoscopy length was significantly shorter in the OR (67 (48-122) minutes) versus the ICU (158 (95-166) minutes, P = 0.004) and the ED (111 (92-155) minutes, P = 0.009). Time to procedure was similar if the procedure was performed in the ED (278 minutes), the ICU (331 minutes), or the OR (378 minutes). The median (interquartile range) of HLOS for the OR group (0.87 (0.54-2.03) days) was significantly shorter than the ICU group (2.26 (1.47-6.91) days, P = 0.007). Conclusions While performing endoscopy for esophageal foreign body removal in the OR may be associated with a shorter EPL and HLOS, no location was inferior for overall outcomes. Further prospective and randomized studies are needed to confirm our findings.

Thermophoresis and dust devils on the planet Mars.

In the Martian atmosphere dust is abundant and is continuously replenished by the entrainment of materials and sediments from the surface of the planet. The sediment concentrations are particularly high and noticeable in whirlwinds, also known as dust devils. Assuming the thermophoresis force as the main driver of dust particles lifting from the surface, the dust process of the Martian atmosphere and its naturally formed dust devils are investigated for the northern polar region of the planet. Our simulated convective boundary layer shows that it may be unlikely that visible dust devils are formed only due to thermophoresis effects and some other lifting mechanisms are required.

miRNA and piRNA localization in the male mammalian meiotic nucleus.

During mammalian meiosis, transcriptional silencing of the XY bivalent is a necessary event where defects may lead to infertility in males. While not well understood, the mechanism of meiotic gene silencing is believed to be RNA-dependent. In this study, we investigated the types and localization of non-coding RNAs in the meiotic nucleus of the male mouse using a microarray screen with different cell isolates as well as FISH. We report that the dense body, a component of the murine spermatocyte sex body similar to that of a dense body in Chinese hamster spermatocytes, is DNA-negative but rich in proteins and RNA including miRNAs (micro RNAs) and piRNAs (PIWI associated small RNAs), or their precursors. Selective miRNAs and piRNAs localize to chromosome cores, telomeres and the sex body of spermatocytes. These RNAs have not previously been detected in meiotic nuclei. These RNAs appear to associate with the nucleolus of the Sertoli cells as well as with the dense body. While in MIWI-null male mice the nucleolar signal from miRNA and piRNA probes in Sertoli cells is largely diminished, a differential regulation must exist in meiotic nuclei since the localization of these two components appears to be unaffected in the null animal.