Research Spotlight

Liang, B., Feng, D., Lyon, K.A., Zhang, Y. and Huang, J.H. (2021). “Intraoperative utilization of Microvascular Doppler for the detection of intracranial venous structures during tumor resection – A technical note.” J Clin Neurosci 88: 10-15.

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BACKGROUND: Microvascular Doppler (MVD) has been widely used for the detection of arterial blood flow in the brain, especially during aneurysm clipping, vascular malformation resection, or bypass surgeries. However, the benefits obtained from early identification of intracranial sinuses and deep draining veins during tumor resection has not been reported. METHODS: We reviewed the clinical data and imaging from our cases and conducted a systemic review of the medical literature using PubMed and keywords. Bibliographies of each result were evaluated to determine if additional reports describing the use of MVD during tumor resection could be found. RESULTS: No reports were found in the literature where MVD was specifically used for venous identification during the resection of deep-seated brain tumors. In our patient cohort, MVD was used successfully to detect and ultimately allow immediate protection of large dural venous sinuses as well as smaller deep cerebral veins during tumor resection. Each patient developed no new venous infarcts and made a satisfactory recovery with no new postoperative neurological deficits. CONCLUSION: MVD is a reliable tool for the intraoperative detection of intracranial venous blood flow to allow for quick identification and protection of venous structures. MVD is an additional safety measure for the patient as its accuracy in detecting venous structures is less susceptible to many of the inherent weaknesses of stereotactic neuro-navigation including the accompanying brain shift or anatomical distortion produced by long duration deep seated brain tumor resection.

Cripe, C.T., Cooper, R., Mikulecky, P., Huang, J.H. and Hack, D.C. (2021). “Improved Mild Closed Head Traumatic Brain Injury Outcomes With a Brain-Computer Interface Amplified Cognitive Remediation Training.” Cureus 13(5): e14996.

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This study is a retrospective chart review of 200 clients who participated in a non-verbal restorative cognitive remediation training (rCRT) program between 2012 and 2020. Each client participated in the program for about 16 weeks, and the study as a whole occurred over a five-year period. The program was applied to effect proper neural functional remodeling needed to support resilient, flexible, and adaptable behaviors after encountering a mild closed head traumatic brain injury (mTBI). The rCRT program focused on improving functional performance in executive cognitive control networks as defined by fMRI studies. All rCRT activities were delivered in a semi-game-like manner, incorporating a brain-computer interface (BCI) that provided in-the-moment neural network performance integrity metrics (nPIMs) used to adjust the level of play required to properly engage long-term potentiation (LTP) and long-term depression (LTD) network learning rules. This study reports on t-test and Reliable Change Index (RCI) changes found within individual cognitive abilities’ performance metrics derived from the Woodcock-Johnson Cognitive Abilities III Test. We compared pre- and post-scores from seven cognitive abilities considered dependent on executive cognitive control networks against seven non-executive control abilities. We observed significant improvements (p < 10(-4)) with large Cohen's deffect sizes (0.78-1.20) across 13 of 14 cognitive ability domains with a medium effect size (0.49) on the remaining one. The mean percent change for the pooled trained domain was double that observed for the pooled untrained domain, at 17.2% versus 8.3%, respectively. To further adjust for practice effects, practice effect RCI values were computed and further supported the effectiveness of the rCRT (trained RCI 1.4-4.8; untrained RCI 0.-08-0.75).

High, R., Zhang, Y., Virani, S., Eggleston, K., Kuehl, T.J., Bird, E.T. and Danford, J.M. (2021). “Pilot Trial of Midstream Urine Collection Device Versus Transurethral Catheter in Women With Lower Urinary Tract Symptoms: Practicality of Use in a Clinical Setting, Patient Preferences, and Comparison of Laboratory Findings.” Female Pelvic Med Reconstr Surg 27(6): 371-376.

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OBJECTIVES: This study aimed to evaluate successful use of a midstream urine collection device in women with lower urinary tract symptoms and to assess specimen contamination. METHODS: Nonpregnant women 18 years or older without use of antibiotics in the last 4 weeks were recruited. After using the midstream urine collection device to obtain a specimen in a private restroom, a paired specimen was obtained by transurethral catheterization. Patients completed preference questionnaires. Culture organisms and microscopic urinalysis of paired specimens (device vs catheterized) were compared using the McNemar χ2 test. Bivariate analysis was performed. RESULTS: Successful use was demonstrated in 54 (77%) of 70. Reasons for failure included inadequate specimen volume and improper device use. Older median age (50 vs 72 years, P = 0.0003) and history of diabetes (7% vs 27%, P = 0.037) were associated with failed use. Organisms were discordant in 21 (41%) of 51 paired urine culture specimens. The device detected 7 (88%) of 8 uropathogens. There were no detectable differences in microscopic urinalysis. CONCLUSIONS: The midstream urine collection device could increase comfort, and many patients prefer it to transurethral catheterization. With proper patient selection and instructions for use, this device could increase satisfaction. Further studies are needed to assess contamination rates with this device.

Aldujeli, A., Hamadeh, A., Tecson, K.M., Krivickas, Z., Maciulevicius, L., Stiklioraitis, S., Sukys, M., Briedis, K., Aldujeili, M., Briede, K., Braukyliene, R., Pranculis, A., Unikas, R., Zaliaduonyte, D. and McCullough, P.A. (2021). “Six-Month Outcomes for COVID-19 Negative Patients with Acute Myocardial Infarction Before Versus During the COVID-19 Pandemic.” Am J Cardiol 147: 16-22.

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The Coronavirus disease 2019 (COVID-19) pandemic has changed the way patients seek medical attention and how medical services are provided. We sought to compare characteristics, clinical course, and outcomes of patients presenting with acute myocardial infarction (AMI) during the pandemic compared with before it. This is a multicenter, retrospective cohort study of consecutive COVID-19 negative patients with AMI in Lithuania from March 11, 2020 to April 20, 2020 compared with patients admitted with the same diagnosis during the same period in 2019. All patients underwent angiography. Six-month follow-up was obtained for all patients. A total of 269 patients were included in this study, 107 (40.8%) of whom presented during the pandemic. Median pain-to-door times were significantly longer (858 [quartile 1=360, quartile 3 = 2,600] vs 385.5 [200, 745] minutes, p <0.0001) and post-revascularization ejection fractions were significantly lower (35 [30, 45] vs 45 [40, 50], p <0.0001) for patients presenting during vs. prior to the pandemic. While the in-hospital mortality rate did not differ, we observed a higher rate of six-month major adverse cardiovascular events for patients who presented during versus prior to the pandemic (30.8% vs 13.6%, p = 0.0006). In conclusion, 34% fewer patients with AMI presented to the hospital during the COVID-19 pandemic, and those who did waited longer to present and experienced more 6-month major adverse cardiovascular events compared with patients admitted before the pandemic.

Medvedofsky, D., Milhorini Pio, S., Weissman, N.J., Namazi, F., Delgado, V., Grayburn, P.A., Kar, S., Lim, D.S., Lerakis, S., Zhou, Z., Liu, M., Alu, M.C., Kapadia, S.R., Lindenfeld, J., Abraham, W.T., Mack, M.J., Bax, J.J., Stone, G.W. and Asch, F.M. (2021). “Left Ventricular Global Longitudinal Strain as a Predictor of Outcomes in Patients with Heart Failure with Secondary Mitral Regurgitation: The COAPT Trial.” J Am Soc Echocardiogr May 8;S0894-7317(21)00184-X. [Epub ahead of print].

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BACKGROUND: Left ventricular (LV) global longitudinal strain (GLS) is a sensitive marker of LV function and may help identify patients with heart failure (HF) and secondary mitral regurgitation who would have a better prognosis and are more likely to benefit from edge-to-edge transcatheter mitral valve repair with the MitraClip. The aim of this study was to assess the prognostic utility of baseline LV GLS during 2-year follow-up of patients with HF with secondary mitral regurgitation enrolled in the Cardiovascular Outcomes Assessment of the MitraClip Percutaneous Therapy for Heart Failure Patients with Functional Mitral Regurgitation trial. METHODS: Patients with symptomatic HF with moderate to severe or severe secondary mitral regurgitation who remained symptomatic despite maximally tolerated guideline-directed medical therapy (GDMT) were randomized to transcatheter mitral valve repair plus GDMT or GDMT alone. Speckle-tracking-derived LV GLS from baseline echocardiograms was obtained in 565 patients and categorized in tertiles. Death and HF hospitalization at 2-year follow-up were the principal outcomes of interest. RESULTS: Patients with better baseline LV GLS had higher blood pressure, greater LV ejection fraction and stroke volume, lower levels of B-type natriuretic peptide, and smaller LV size. No significant difference in outcomes at 2-year follow-up were noted according to LV GLS. However, the rate of death or HF hospitalization between 10 and 24 months was lower in patients with better LV GLS (P = .03), with no differences before 10 months. There was no interaction between GLS tertile and treatment group with respect to 2-year clinical outcomes. CONCLUSIONS: Baseline LV GLS did not predict death or HF hospitalization throughout 2-year follow-up, but it did predict outcomes after 10 months. The benefit of transcatheter mitral valve repair over GDMT alone was consistent in all subgroups irrespective of baseline LV GLS.