Comparative metabolomics reveal key pathways associated with the synergistic activities of aztreonam and clavulanate combination against multidrug-resistant Escherichia coli.

IMPORTANCE: Multidrug-resistant Escherichia coli is a major threat to the health care system and is associated with poor outcomes in infected patients. The combined use of antibiotics has become an important treatment method for multidrug-resistant bacteria. However, the mechanism for their synergism has yet to be explored.

Effect of amoxicillin/clavulanic acid in attenuating pregabalin-induced condition place preference.

Substance abuse is a worldwide problem with serious repercussions for patients and the communities where they live. Pregabalin (Lyrica), is a medication commonly used to treat neuropathic pain. Like other analgesic medications there has been concern about pregabalin abuse and misuse. Although it was initially suggested that pregabalin, like other gabapentinoids, has limited abuse liability, questions still remain concerning this inquiry. Changes in glutamate system homeostasis are a hallmark of adaptations underlying drug dependence, including down-regulation of the glutamate transporter 1 (GLT-1; SLC1A2) and the cystine/glutamate antiporter (xCT; SLC7A11). In this study, it was found that pregabalin (90 mg/kg) produces a conditioned place preference (CPP), indicative of reinforcing effects that suggest a potential for abuse liability. Moreover, like other drugs of abuse, pregabalin also produced alterations in glutamate homeostasis, reducing the mRNA expression of Slc1a2 and Slc7a11 in the nucleus accumbens (NAc) and medial prefrontal cortex (mPFC). Amoxicillin clavulanic acid, a ß-lactam antibiotic, blocked the reinforcing effects of pregabalin and normalized glutamate homeostasis. These results suggest that pregabalin has abuse potential that should be examined more critically, and that, moreover, the mechanisms underlying these effects are similar to those of other drugs of abuse, such as heroin and cocaine. Additionally, these results support previous findings showing normalization of glutamate homeostasis by ß-lactam drugs that provides a novel potential therapeutic approach for the treatment of drug abuse and dependence.

Amoxicillin concentrations in relation to beta-lactamase activity in sputum during exacerbations of chronic obstructive pulmonary disease.

BACKGROUND: Acute exacerbations of chronic obstructive pulmonary disease (COPD) are often treated with antibiotics. Theoretically, to be maximally effective, the antibiotic concentration at sites of infection should exceed the minimum inhibitory concentration at which 90% of the growth of potential pathogens is inhibited (MIC90). A previous study showed that most hospitalized COPD patients had sputum amoxicillin concentrations

Ustekinumab en hidradenitis supurativa: a propósito de un caso / Ustekinumab for Hidradenitis Suppurativa: A Case Report

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Dolor ocular: síntoma guía en la presentación de la celulitis orbitaria / Eye pain: presenting symptom of orbital cellulitis

La celulitis orbitaria es una infección localizada por detrás del septum orbitario. El origen de esta infección suele ser una complicación de una sinusitis. Los síntomas y signos que acompañan a la celulitis orbitaria varían según el grado de afectación de las estructuras intraorbitarias, pudiendo producir dolor ocular, quemosis, proptosis, oftalmoplejia y/o disminución de la agudeza visual. La sospecha clínica es muy importante, puesto que su pronóstico depende de la prontitud en su diagnóstico y tratamiento. Presentamos dos casos clínicos en los que el dolor ocular fue el síntoma de sospecha de celulitis orbitaria (AU)

Orbital cellulitis is an infection located behind the orbital septum. The origin of this infection is often a complication of sinusitis.The symptoms and signs that accompany orbital cellulitis depend on the extent of intraorbital structures and may produce eye pain, chemosis, proptosis, oftamoplejia or alteration of visual acuity. Clinical suspicion is very important because the prognosis depends on early diagnosis and its treatment. We present two cases in which ocular pain was the symptom of suspected orbital cellulitis (AU)

Co-amoxiclav induces proliferation and cytotoxin production of Clostridium difficile ribotype 027 in a human gut model.

OBJECTIVES: Co-amoxiclav is widely prescribed in hospitals. Although reports have suggested it may be linked to onset of Clostridium difficile infection (CDI), data on the risk of CDI associated with specific antibiotics is difficult to obtain, due to confounding clinical factors. We have examined the propensity of co-amoxiclav to induce CDI using a human gut model. METHODS: We used a triple-stage chemostat human gut model to study the effects of co-amoxiclav on indigenous gut microorganisms and C. difficile PCR ribotype 027. C. difficile viable counts and spores were evaluated, and cytotoxin titres were assayed. Co-amoxiclav concentrations were measured using a large plate bioassay. RESULTS: Co-amoxiclav induced rapid C. difficile germination and high toxin production in the gut model, from 5 days after commencement of instillation. Cell proliferation and toxin production were prolonged and continued throughout the duration of the experiment. Only very low levels of co-amoxiclav antimicrobial activity could be detected within the gut model, despite having a marked effect on gut flora microorganisms. CONCLUSIONS: Co-amoxiclav induced CDI within the gut model, supporting clinical observations linking co-amoxiclav treatment with CDI onset. This reinforces the value of the gut model as a clinically relevant means of studying CDI. Caution should be exercised in the prescription of co-amoxiclav to patients in high CDI risk settings.

Amoxicillin/clavulanate in chronic rhinosinusitis: tissue and serum distribution.

UNLABELLED: Amoxicillin/clavulanate in chronic rhinosinusitis: tissue and serum distribution. OBJECTIVE: The aim of the present study is to determine the concentrations of coamoxiclav in the sinusal mucosa of patients undergoing surgery for chronic sinusitis in comparison to serum levels after single oral administration. METHODOLOGY: 24 patients affected by chronic sinusitis, undergoing sinus surgery, were divided into three groups receiving an oral dose of 1 g of coamoxiclav (875 mg amoxicillin, 125 g of clavulanic acid, 7:1 ratio) at 2 h (first group), 4 h (second group) and 6 h (third group) before surgery. The mean concentration of amoxicillin and clavulanic acid were determined biologically in serum and in tissues. RESULTS: The highest concentrations of coamoxiclav both in serum and tissues were observed in the group which received the antibiotic 2 hours before surgery. However the tissue levels of both amoxicillin and clavulanic acid in the time period within 2-6 h after administration were higher than the Minimum Inhibitory Concentration (MIC) for the most frequent causative pathogens of sinus bacterial infections. CONCLUSIONS: Since penicillins need to maintain concentrations above the MIC for at least 40 to 60% of the interval time between administrations to be potentially effective, the Authors concluded that since both amoxicillin and clavulanic acid spread well in the ENT tissues, 1 g twice a day of the combination seems to be clinically effective even in patients suffering from acute episodes of chronic rhinosinusitis.