Acute mesenteric ischemia caused by isolated dissection of the superior mesenteric artery and thrombotic occlusion of its major branches: treatment by systemic thrombolysis with recombinant tissue plasminogen activator (rtPA)

Introduction. Isolated superior mesenteric artery (SMA) dissection, without associated aortic dissection, is relatively uncommon. Therefore, there are insufficient data to support a particular therapeutic option in the specific setting of isolated SMA dissection associated with thrombotic complications. Case report. In this article we describe the diagnosis and treatment of a patient who presented to the Emergency Department with the clinical picture of an acute abdomen and signs suggestive of acute occlusion of the SMA. Diagnostic studies showed an isolated SMA dissection with acute thrombotic occlusion of its main branches. The patient was successfully treated with systemic recombinant tissue plasminogen activator (rtPA) thrombolysis. To the best of our knowledge, this is the first description of a case of isolated SMA dissection associated with thrombotic occlusion of its main branches. Conclusion. In patients presenting with persistent abdominal pain and unspecific clinical findings, rare causes should be considered because of their life threatening complications. Systemic thrombolysis is a feasible technique for the treatment of isolated SMA dissection associated with thrombotic complications in the absence of bowel necrosis

Acute mesenteric ischemia caused by isolated dissection of the superior mesenteric artery and thrombotic occlusion of its major branches: treatment by systemic thrombolysis with recombinant tissue plasminogen activator (rtPA)

Introduction. Isolated superior mesenteric artery (SMA) dissection, without associated aortic dissection, is relatively uncommon. Therefore, there are insufficient data to support a particular therapeutic option in the specific setting of isolated SMA dissection associated with thrombotic complications. Case report. In this article we describe the diagnosis and treatment of a patient who presented to the Emergency Department with the clinical picture of an acute abdomen and signs suggestive of acute occlusion of the SMA. Diagnostic studies showed an isolated SMA dissection with acute thrombotic occlusion of its main branches. The patient was successfully treated with systemic recombinant tissue plasminogen activator (rtPA) thrombolysis. To the best of our knowledge, this is the first description of a case of isolated SMA dissection associated with thrombotic occlusion of its main branches. Conclusion. In patients presenting with persistent abdominal pain and unspecific clinical findings, rare causes should be considered because of their life threatening complications. Systemic thrombolysis is a feasible technique for the treatment of isolated SMA dissection associated with thrombotic complications in the absence of bowel necrosis

Lemierre’s syndrome: case of a patient with pulmonary embolism and cavernous sinus thrombosis complicating a septic internal jugular vein thrombus

Lemierre’s syndrome is a complex and unusual clinical entity, characterized by septic thrombophlebitis of the internal jugular vein. We present the case of a patient with Lemierre’s syndrome, pulmonary embolism and propagation of an internal jugular vein thrombus retrograde to the cavernous sinus. The patient was treated with antibiotics and heparin. The importance of rapid diagnosis of the extent of the disease, in directing the otherwise somewhat controversial treatment with heparin in patients with Lemierre’s syndrome, is stressed

Aortoduodenalna fistula tri godine nakon aorto-bifemoralne premosnice: prikaz slučaja i pregled literature

Secondary aortoenteric fistulas (SAEF ) are a relatively rare but dangerous complication of aortal reconstructive surgery. We present a patient that underwent aortobifemoral bypass three years before developing the signs of aortoenteric fistula, and we reviewed the literature on the topic. Since the clinical signs are nonspecific, physicians should have a high index of suspicion for SAEF in patients who underwent aortal reconstructive surgery. The most useful diagnostic tools for stable patients are upper gastrointestinal endoscopy and computed tomography scan with contrast that can, in combination with history and clinical signs, enable accurate diagnosis in more than 90% of patients. Unstable patients with suspected aortoenteric fistula should undergo exploratory laparotomy. The treatment of choice is open surgery with graft excision, wide debridement of infected tissue, bowel repair or resection followed by an extra-anatomic bypass or in situ placement of a new graft. Early postoperative mortality remains high, around 30% in most analyses. Currently there are no guidelines for the diagnosis and management of SAEF , so individualized approach is necessary for each patient.Sekundarne aorto-enteralne fistule su rijetka ali opasna komplikacija aortne rekonstruktivne kirurgije. Prikazuje se bolesnik kod kojega su se razvili simptomi aorto-enteralne fistule tri godine nakon ugradnje aorto-bifemoralne premosnice, uz pregled literature. S obzirom na to da su klinički znaci vrlo nespecifični kod ovih bolesnika, važno je rano posumnjati na moguć razvoj sekundarne aorto-enteralne fistule kod bolesnika koji su bili podvrgnuti aortnoj rekonstruktivnoj kirurgiji. Od dijagnostičkih metoda najkorisnije su ezofagogastroduodenoskopija i kompjutorizirana tomografija s kontrastom koji, u kombinaciji s anamnezom i kliničkim znacima, omogućavaju postavljanje dijagnoze u preko 90% bolesnika. U nestabilnih bolesnika kod kojih postoji sumnja na razvoj ovoga stanja indicirana je eksplorativna laparotomija. U liječenju metoda izbora je laparotomija, ekscizija proteze, debrideman upaljenog tkiva, popravak defekta na crijevu ili resekcija zahvaćenog segmenta, te ekstraanatomska premosnica ili postavljanje nove proteze. Poslijeoperacijska smrtnost je oko 30%. Kako zasad nema smjernica za dijagnostiku i liječenje bolesnika sa sekundarnim aorto-enteralnim fistulama nužan je visoko individualizirani pristup za svakog bolesnika

Effects of menstrual cycle on hemodynamic and autonomic responses to central hypovolemia

BackgroundEstrogen and progesterone levels undergo changes throughout the menstrual cycle. Existing literature regarding the effect of menstrual phases on cardiovascular and autonomic regulation during central hypovolemia is contradictory.Aims and studyThis study aims to explore the influence of menstrual phases on cardiovascular and autonomic responses in both resting and during the central hypovolemia induced by lower body negative pressure (LBNP). This is a companion paper, in which data across the menstrual phases from healthy young females, whose results are reported in Shankwar et al. (2023), were further analysed.MethodsThe study protocol consisted of three phases: (1) 30 min of supine rest; (2) 16 min of four LBNP levels; and (3) 5 min of supine recovery. Hemodynamic and autonomic responses (assessed via heart rate variability, HRV) were measured before-, during-, and after-LBNP application using Task Force Monitor® (CNSystems, Graz, Austria). Blood was also collected to measure estrogen and progesterone levels.ResultsIn this companion paper, we have exclusively assessed 14 females from the previous study (Shankwar et al., 2023): 8 in the follicular phase of the menstrual cycle (mean age 23.38 ± 3.58 years, height 166.00 ± 5.78 cm, weight 57.63 ± 5.39 kg and BMI of 20.92 ± 1.96 25 kg/m2) and 6 in the luteal phase (mean age 22.17 ± 1.33 years, height 169.83 ± 5.53 cm, weight 62.00 ± 7.54 kg and BMI of 21.45 ± 2.63 kg/m2). Baseline estrogen levels were significantly different from the follicular phase as compared to the luteal phase: (33.59 pg/ml, 108.02 pg/ml, respectively, p < 0.01). Resting hemodynamic variables showed no difference across the menstrual phases. However, females in the follicular phase showed significantly lower resting values of low-frequency (LF) band power (41.38 ± 11.75 n.u. and 58.47 ± 14.37 n.u., p = 0.01), but higher resting values of high frequency (HF) band power (58.62 ± 11.75 n.u. and 41.53 ± 14.37 n.u., p = 0.01), as compared to females in the luteal phase. During hypovolemia, the LF and HF band powers changed only in the follicular phase F(1, 7) = 77.34, p < 0.0001 and F(1, 7) = 520.06, p < 0.0001, respectively.ConclusionsThe menstrual phase had an influence on resting autonomic variables, with higher sympathetic activity being observed during the luteal phase. Central hypovolemia leads to increased cardiovascular and autonomic responses, particularly during the luteal phase of the menstrual cycle, likely due to higher estrogen levels and increased sympathetic activity

Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (μ̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ¯ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ¯ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),μ̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| < 0.03 at 95% confidence level. [Figure not available: see fulltext.

Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at root s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

Peer reviewe

An embedding technique to determine ττ backgrounds in proton-proton collision data

An embedding technique is presented to estimate standard model tau tau backgrounds from data with minimal simulation input. In the data, the muons are removed from reconstructed mu mu events and replaced with simulated tau leptons with the same kinematic properties. In this way, a set of hybrid events is obtained that does not rely on simulation except for the decay of the tau leptons. The challenges in describing the underlying event or the production of associated jets in the simulation are avoided. The technique described in this paper was developed for CMS. Its validation and the inherent uncertainties are also discussed. The demonstration of the performance of the technique is based on a sample of proton-proton collisions collected by CMS in 2017 at root s = 13 TeV corresponding to an integrated luminosity of 41.5 fb(-1).Peer reviewe

MUSiC : a model-unspecific search for new physics in proton-proton collisions at root s=13TeV

Results of the Model Unspecific Search in CMS (MUSiC), using proton-proton collision data recorded at the LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1), are presented. The MUSiC analysis searches for anomalies that could be signatures of physics beyond the standard model. The analysis is based on the comparison of observed data with the standard model prediction, as determined from simulation, in several hundred final states and multiple kinematic distributions. Events containing at least one electron or muon are classified based on their final state topology, and an automated search algorithm surveys the observed data for deviations from the prediction. The sensitivity of the search is validated using multiple methods. No significant deviations from the predictions have been observed. For a wide range of final state topologies, agreement is found between the data and the standard model simulation. This analysis complements dedicated search analyses by significantly expanding the range of final states covered using a model independent approach with the largest data set to date to probe phase space regions beyond the reach of previous general searches.Peer reviewe

Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe