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BioRxiv : the Preprint Server For... Jun 2024Spinal cord stimulation (SCS) has emerged as a therapeutic tool for improving motor function following spinal cord injury. While many studies focus on restoring...
Spinal cord stimulation (SCS) has emerged as a therapeutic tool for improving motor function following spinal cord injury. While many studies focus on restoring locomotion, little attention is paid to enabling standing which is a prerequisite of walking. In this study, we fully characterize a new type of response to SCS, a long extension activated post-stimulation (LEAP). LEAP is primarily directed to ankle extensors and hence has great clinical potential to assist postural movements. To characterize this new response, we used the decerebrate cat model to avoid the suppressive effects of anesthesia, and combined EMG and force measurement in the hindlimb with intracellular recordings in the lumbar spinal cord. Stimulation was delivered as five-second trains via bipolar electrodes placed on the cord surface, and multiple combinations of stimulation locations (L4 to S2), amplitudes (50-600 uA), and frequencies (10-40 Hz) were tested. While the optimum stimulation location and frequency differed slightly among animals, the stimulation amplitude was key for controlling LEAP duration and amplitude. To study the mechanism of LEAP, we performed in vivo intracellular recordings of motoneurons. In 70% of motoneurons, LEAP increased at hyperpolarized membrane potentials indicating a synaptic origin. Furthermore, spinal interneurons exhibited changes in firing during LEAP, confirming the circuit origin of this behavior. Finally, to identify the type of afferents involved in generating LEAP, we used shorter stimulation pulses (more selective for proprioceptive afferents), as well as peripheral stimulation of the sural nerve (cutaneous afferents). The data indicates that LEAP primarily relies on proprioceptive afferents and has major differences from pain or withdrawal reflexes mediated by cutaneous afferents. Our study has thus identified and characterized a novel postural motor response to SCS which has the potential to expand the applications of SCS for patients with motor disorders.
PubMed: 38915687
DOI: 10.1101/2024.06.13.598885 -
Journal of Orthopaedic Surgery and... Jun 2024The objective of this study was to provide a comprehensive review of the existing literature regarding the treatment of osteochondral lesions of the talus (OLT) using... (Meta-Analysis)
Meta-Analysis
PURPOSE
The objective of this study was to provide a comprehensive review of the existing literature regarding the treatment of osteochondral lesions of the talus (OLT) using autologous matrix-induced chondrogenesis (AMIC), while also discussing the mid-long term functional outcomes, complications, and surgical failure rate.
METHODS
We searched Embase, PubMed, and Web of Science for studies on OLT treated with AMIC with an average follow-up of at least 2 years. Publication information, patient data, functional scores, surgical failure rate, and complications were extracted.
RESULTS
A total of 15 studies were screened and included, with 12 case series selected for meta-analysis and 3 non-randomized controlled studies chosen for descriptive analysis. The improvements in the Visual Analog Scale (VAS), the American Orthopaedic Foot & Ankle Society (AOFAS) ankle-hindfoot, and Tegner scores at the last follow-up were (SMD = - 2.825, 95% CI - 3.343 to - 2.306, P < 0.001), (SMD = 2.73, 95% CI 1.60 to 3.86, P < 0.001), (SMD = 0.85, 95% CI 0.5 to 1.2, P < 0.001) respectively compared to preoperative values. The surgery failure rate was 11% (95% CI 8-15%), with a total of 12 patients experiencing complications.
CONCLUSION
The use of AMIC demonstrates a positive impact on pain management, functional improvement, and mobility enhancement in patients with OLT. It is worth noting that the choice of stent for AMIC, patient age, and OLT size can influence the ultimate clinical outcomes. This study provides evidences supporting the safety and efficacy of AMIC as a viable treatment option in real-world medical practice.
Topics: Humans; Talus; Chondrogenesis; Transplantation, Autologous; Treatment Outcome; Time Factors; Cartilage, Articular
PubMed: 38915104
DOI: 10.1186/s13018-024-04864-z -
Journal of Neuroengineering and... Jun 2024Impaired ankle proprioception strongly predicts balance dysfunction in chronic stroke. However, only sparse data on ankle position sense and no systematic data on ankle...
BACKGROUND
Impaired ankle proprioception strongly predicts balance dysfunction in chronic stroke. However, only sparse data on ankle position sense and no systematic data on ankle motion sense dysfunction in stroke are available. Moreover, the lesion sites underlying impaired ankle proprioception have not been comprehensively delineated. Using robotic technology, this study quantified ankle proprioceptive deficits post-stroke and determined the associated brain lesions.
METHODS
Twelve adults with chronic stroke and 13 neurotypical adults participated. A robot passively plantarflexed a participant's ankle to two distinct positions or at two distinct velocities. Participants subsequently indicated which of the two movements was further/faster. Based on the stimulus-response data, psychometric just-noticeable-difference (JND) thresholds and intervals of uncertainty (IU) were derived as measures on proprioceptive bias and precision. To determine group differences, Welch's t-test and the Wilcoxon-Mann-Whitney test were performed for the JND threshold and IU, respectively. Voxel-based lesion subtraction analysis identified the brain lesions associated with observed proprioceptive deficits in adults with stroke.
RESULTS
83% of adults with stroke exhibited abnormalities in either position or motion sense, or both. JND and IU measures were significantly elevated compared to the control group (Position sense: + 77% in JND, + 148% in IU; Motion sense: +153% in JND, + 78% in IU). Adults with stroke with both impaired ankle position and motion sense had lesions in the parietal, frontal, and temporoparietal regions.
CONCLUSIONS
This is the first study to document the magnitude and frequency of ankle position and motion sense impairment in adults with chronic stroke. Proprioceptive dysfunction was characterized by elevated JND thresholds and increased uncertainty in perceiving ankle position/motion. Furthermore, the associated cortical lesions for impairment in both proprioceptive senses were largely overlapping.
Topics: Humans; Male; Robotics; Proprioception; Female; Middle Aged; Stroke; Ankle; Aged; Adult; Chronic Disease; Brain; Stroke Rehabilitation
PubMed: 38915064
DOI: 10.1186/s12984-024-01396-9 -
International Journal of Applied &... 2024Improvement in the perioperative care has led to increased use of minimally invasive surgeries. Multiple physiological changes during minimally invasive surgeries are...
BACKGROUND
Improvement in the perioperative care has led to increased use of minimally invasive surgeries. Multiple physiological changes during minimally invasive surgeries are attributed to the creation of pneumoperitoneum.
MATERIALS AND METHODS
One hundred and nine patients who underwent laparoscopic cholecystectomy at a tertiary care hospital in north India meeting the inclusion and exclusion criteria were enrolled.
RESULTS
Out of the total 109 patients, 13 were males and 96 females (M:F = 1:7.3), the mean basal metabolic rate was 28.95 kg/m. The mean systolic and diastolic blood pressure of the upper limb were 134.33 + 17.545 and 80.69 + 11.59 respectively. The mean systolic and diastolic blood pressure in lower limb (LL) were 142.32 + 21.552 and 79.44 + 11.94, respectively. Significant rise in the SBP was noticed in LL at the time of creation of Pneumoperitoneum and after changing the position for surgery ( < 0.05). The diastolic pressure in the LL rises significantly in the LL after creation of pneumoperitoneum, at induction, after reverse Trendelenburg position and extubation ( < 0.05). The mean arterial pressure increased significantly in the LL after the creation of pneumoperitoneum and persisted till the extubation ( < 0.05). A significant rise of ankle-brachial index (ABI) was observed in the patients after the creation of pneumoperitoneum and it remained significant till 15 min into surgery ( < 0.05). There was no correlation of ABI with weight and age of the patients on Pearson correlation.
CONCLUSION
There is rise in ABI of the patients undergoing laparoscopic cholecystectomy at the time of creation of pneumoperitoneum, after Trendelenburg position and 15 min into surgery.
PubMed: 38912362
DOI: 10.4103/ijabmr.ijabmr_498_23 -
Frontiers in Medicine 2024The long-term clinical effect of arterial stiffness in high-risk disease entities remains unclear. The prognostic implications of brachial-ankle pulse wave velocity...
OBJECTIVE
The long-term clinical effect of arterial stiffness in high-risk disease entities remains unclear. The prognostic implications of brachial-ankle pulse wave velocity (baPWV) were assessed using a real-world registry that included patients who underwent percutaneous coronary intervention (PCI).
METHODS
Arterial stiffness was measured using baPWV before discharge. The primary outcome was net adverse clinical events (NACE), defined as a composite of all-cause death, non-fatal myocardial infarction, non-fatal stroke, or major bleeding. Secondary outcomes included major adverse cardiac and cerebrovascular events (MACCE: a composite of all-cause death, non-fatal myocardial infarction, or non-fatal stroke), and major bleeding. The outcomes were assessed over a 4-year period.
RESULTS
Patients ( = 3,930) were stratified into high- and low-baPWV groups based on a baPWV cut-off of 1891 cm/s determined through time-dependent receiver operating characteristic curve analysis. baPWV was linearly correlated with 4-year post-PCI clinical events. The high baPWV group had a greater cumulative incidence of NACE, MACCE, and major bleeding. According to multivariable analysis, the high baPWV groups had a significantly greater risk of 4-year NACE (adjusted hazard ratio [HRadj]: 1.44; 95% confidence interval [CI]: 1.12-1.85; = 0.004), MACCE (HRadj: 1.40; 95% CI: 1.07-1.83; = 0.015), and major bleeding (HRadj: 1.94; 95% CI: 1.15-3.25; = 0.012).
CONCLUSION
In PCI-treated patients, baPWV was significantly associated with long-term clinical outcomes, including ischemic and bleeding events, indicating its value for identifying high-risk phenotypes.
PubMed: 38912344
DOI: 10.3389/fmed.2024.1384981 -
Cureus Jun 2024Background Postpartum peripheral nerve injuries can impact recovery. Elastic stockings are recommended for thromboembolism prevention, although concerns about entrapment...
Background Postpartum peripheral nerve injuries can impact recovery. Elastic stockings are recommended for thromboembolism prevention, although concerns about entrapment neuropathy exist. In this prospective observational study, we investigated the differential compressions caused by wearing elastic stockings before and after anesthesia, as well as changes in the diameters of the lower leg and ankle in parturient women undergoing spinal anesthesia for elective cesarean section (CS). Methods Eighteen pregnant women, classified by the American Society of Anesthesiologists as having physical status 2, underwent lower leg measurements taken before a CS. Elastic stockings were applied, and compression pressure was measured at pre-anesthesia, post-surgery, and six hours post-return to a hospital room. Fluid, blood loss, urine output, and neuropathy presence were recorded. For all parameters, changes at the three time points were compared for the primary analysis. For secondary analysis, participants were categorized as having intraoperative blood loss greater than (group P) or less than 1,000 g (group N), and factors were compared with pre-anesthesia and six hours post-return to a room. Data were analyzed and presented using a one-way analysis of variance with Bonferroni correction for multiple comparisons or unpaired two-tailed t-tests for pairwise comparison. Results None of the women had postoperative entrapment neuropathy. Six patients had >1,000 g of blood loss. Compression significantly increased from pre-anesthesia (left 13.6 ± 2.4, 95% CI: 12.18 to 14.52; right 13.4 ± 2.4, 95% CI: 12.41 to 14.69) to post-surgery (left, 17.4 ± 2.6, 95% CI: 15.68 to 18.12; right, 16.9 ± 2.6, 95% CI: 16.20 to 18.70) (p < 0.01). Compression pressure at post-surgery differed significantly between group P (left, 15.3 ± 1.3; right, 14.7 ± 1.8; 95% CI: -4.98 to -0.32) and group N (left, 18.1 ± 2.9; right, 17.8 ± 2.4; 95% CI: -5.38 to -0.26) (p < 0.05). The results are expressed as mean ± standard deviation, with P-values <0.05 indicating statistical significance. Conclusions In this study, no neuropathy occurred; however, over-compression risk with elastic stockings, especially when exceeding recommended pressure levels, was highlighted. Balancing thromboembolism prevention and over-compression risks is crucial for patients undergoing CSs with spinal anesthesia.
PubMed: 38912079
DOI: 10.7759/cureus.62809 -
Revista Brasileira de Ortopedia Jun 2024To evaluate whether three-dimensional (3D) printing increases agreement in the classification of tibial pilon fractures. Orthopedists and traumatologists...
To evaluate whether three-dimensional (3D) printing increases agreement in the classification of tibial pilon fractures. Orthopedists and traumatologists reviewed radiographs, computed tomography scans with 3D reconstruction, and prototyping 3D printing, and classified the fractures based on the Rüedi-Allgöwer and Arbeitsgemeinschaft für Osteosynthesefragen (AO, Association for the Study of Internal Fixation) Foundation/Orthopedic Trauma Association (AO/OTA) classification systems. Next, data evaluation used Kappa agreement coefficients. The use of the 3D model did not improve agreement for tibial pilon fractures regarding the treatment proposed by the groups. Regarding the classification systems, the agreement only improved concerning the AO/OTA classification when the 3D model was used in the assessment by the foot and ankle specialists. Although 3D printing is statistically relevant for surgeons specializing in foot and ankle, its values remain lower than optimal.
PubMed: 38911898
DOI: 10.1055/s-0044-1785514 -
Journal of Multidisciplinary Healthcare 2024Lower extremity peripheral artery disease (PAD) is a common atherosclerotic cardiovascular disease (ASCVD) involving the aortoiliac, femoropopliteal, and infrapopliteal...
Lower extremity peripheral artery disease (PAD) is a common atherosclerotic cardiovascular disease (ASCVD) involving the aortoiliac, femoropopliteal, and infrapopliteal arterial segments. PAD remains a largely underdiagnosed and undertreated condition. The ankle-brachial index (ABI) is a simple and widely available test that is key detection tool in the diagnosis of PAD and is prognostic for mortality and morbidity. The cardiovascular (CV) team is a diverse array of health care clinicians (eg, nurses, nurse practitioners, physician assistants/associates, pharmacists, podiatrists) who have the qualifications and skills to be able to recognize when patients are at risk for PAD and perform an ABI. It is critical that the healthcare community recognize the critical role the CV team could play in improving outcomes and reducing disparities for patients with PAD.
PubMed: 38911613
DOI: 10.2147/JMDH.S466345 -
Plastic and Reconstructive Surgery.... Jun 2024The aim of this study was to compare the use of pedicled local (PFs) versus random pattern flaps (RpFs) in foot and ankle reconstruction in patients with chronic,...
BACKGROUND
The aim of this study was to compare the use of pedicled local (PFs) versus random pattern flaps (RpFs) in foot and ankle reconstruction in patients with chronic, nonhealing wounds.
METHODS
A single-center, retrospective review of 204 patients with 118 PFs and 86 RpFs was performed. The primary outcome included rates of limb salvage.
RESULTS
PFs were used more often in the hindfoot (44.1% versus 30.2%, = 0.045), lateral and medial surface (39.8% versus 18.6%, = 0.001), and wounds containing exposed bone and hardware (78.8% versus 62.8%, = 0.018). RpFs were used more for forefoot (19.8% versus 10.2%, = 0.053) and plantar defects (58.1% versus 30.3%, = 0.000). RpFs had a higher rate of immediate success (100% versus 95.8%, = 0.053), with no significant differences in rate of long-term limb salvage (77.1% versus 69.8%, = 0.237). PFs had higher rates of ischemia requiring intervention (11.0% versus 3.5%, = 0.048). RpFs had a higher rate of minor amputations (15.12% versus 6.8%, = 0.053) but similar rates of major amputation (15.1% versus 16.1%, = 0.848). There were no significant differences in rates of mortality or ambulatory status.
CONCLUSIONS
Both RpFs and PFs remain reliable options to reconstruct defects of the foot and ankle. Optimizing the use of each flap type should consider wound characteristics. RpFs are preferred for dorsal and plantar defects, whereas PFs are protective for minor infections and preferred for deeper wounds despite a higher rate of partial necrosis.
PubMed: 38911575
DOI: 10.1097/GOX.0000000000005921 -
Annals of Translational Medicine Jun 2024
PubMed: 38911565
DOI: 10.21037/atm-2023-28