Articles: function.
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Descending control of nociception (DCN; also known as conditioned pain modulation [CPM], the behavioral correlate of diffuse noxious inhibitory controls) is the phenomenon whereby pain inhibits pain in another part of the body and is the subject of increasing study because it may represent a biomarker of chronic pain. We recently discovered that pain modulation on the application of a DCN paradigm involving low-intensity test stimuli occurs in the direction of hyperalgesia in healthy mice and rats, whereas the use of high-intensity stimuli produces analgesia. To elucidate the physiological mechanisms underlying hyperalgesic DCN, we administered agonists and antagonists of norepinephrine (NE) and serotonin (5-HT) receptors, key neurochemical players in the production of analgesic DCN. ⋯ By contrast, analgesic DCN was found to be reversed by atipamezole and SB269970 themselves, with no effect of reboxetine or fluoxetine. Thus, hyperalgesic DCN seems to be the neurochemical opposite to analgesic DCN. These data further validate and help elucidate a preclinical paradigm that mimics dysfunctional CPM and thus may form the basis of translational experiments that aim to reveal preventative pharmacological strategies for individuals predisposed to persistent pain.
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Observational Study
Malnutrition on admission is associated with trunk function recovery but not with lower limb muscle strength recovery in patients with acute stroke: an observational cohort study.
The aim of this study was to determine the effects of malnutrition on trunk function and lower leg muscle strength in patients with acute stroke upon hospitalization. ⋯ Malnutrition on admission leads to poor trunk function, but not lower leg muscle strength, in patients with acute stroke.
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Acute heart failure (AHF) exacerbations are a leading cause of hospitalization in the United States. Despite the frequency of AHF hospitalizations, there are inadequate data or practice guidelines on how quickly diuresis should be achieved. ⋯ Aggressive net fluid targets within the first 48 h are associated with effective relief of patient self-reported dyspnea and improved long-term outcomes without adversely affecting renal function.
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Randomized Controlled Trial
A comparative study of the hemodynamic and clinical effects of using or not tourniquet in total knee arthroplasty.
Pneumatic tourniquet is widely used in lower limb surgery to provide a bloodless operating field. Previous studies on total knee arthroplasty (TKA) in which tourniquets have been applied during surgery have reported some vascular and soft-tissue complications. Nevertheless, it is still not well known exactly how use of tourniquets contributes to hemodynamics of the lower limb and its clinical relevance following TKA. In this prospective study, we wished to determine whether tourniquet affects the hemodynamics and postoperative healing of the lower limb in the first few weeks and its clinical relevancies following TKA. ⋯ Tourniquet use in TKA must be managed very carefully. Not only because of immediate complication resulted from tourniquet but also influence on post-operational functional recovery, especially in quadriceps muscle function. According to this study, TKA without tourniquet use preserves better quadriceps muscle function to provide faster recovery and less transfusion need. It avoids complications from tourniquets as well.
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The nucleus of the solitary tract (NTS) contains pro-opiomelanocortin (POMC) neurons that are 1 of the 2 major sources of β-endorphin in the brain. The functional role of these NTS POMC neurons in nociceptive and cardiorespiratory function is debated. We have shown that NTS POMC optogenetic activation produces bradycardia and transient apnoea in a working heart-brainstem preparation and chemogenetic activation with an engineered ion channel (PSAM) produced opioidergic analgesia in vivo. ⋯ Inhibiting NTS POMC neurons does not produce any effect on basal nociception but inhibits stress-induced analgesia (unlike inhibition of arcuate POMC neurons). Activation of NTS POMC neuronal populations in conscious mice did not cause respiratory depression, anxiety, or locomotor deficit (in open field) or affective preference. These findings indicate that NTS POMC neurons play a key role in the generation of endorphinergic endogenous analgesia and can also regulate cardiorespiratory function.