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| 1 | Techniques and accuracy of thoracolumbar pedicle screw placement显示文摘Pedicle screw instrumentation has been used to stabilize the thoracolumbar spine for several decades. Although pedicle screws were originally placed via a freehand technique, there has been a movement in favor of pedicle screw placement with the aid of imaging. Such assistive techniques include fluoroscopy guidance and stereotactic navigation. Imaging has the benefit of increased visualization of a pedicle's trajectory, but can result in increased morbidity associated with radiation exposure, increased time expenditure, and possible workflow interruption. Many institutions have reported high accuracies with each of these three core techniques. However, due to differing definitions of accuracy and varying radiographic analyses, it is extremely difficult to compare studies side-by-side to determine which techniques are superior. From the literature, it can be concluded that pedicles of vertebrae within the mid-thoracic spine and vertebrae that have altered morphology due to scoliosis or other deformities are the most difficult to cannulate. Thus, spine surgeons would benefit the most from using assistive technologies in these circumstances. All other pedicles in thethoracolumbar spine should theoretically be cannulated with ease via a free-hand technique, given appropriate training and experience. Despite these global recommendations, appropriate techniques must be chosen at the surgeon's discretion. Such determinations should be based on the surgeon's experience and the specific pathology that will be treated. | Varun Puvanesarajah Jason A Liauw Sheng-fu Lo Ioan A Lina Timothy F Witham | 2014 | World Journal of Orthopedics2014，5，2： | 7 |
| 2 | Postnatally acquired dengue in a neonate--a case report 显示文摘 | Kanwaljeet KC Varun S Anita A | 2013 | J Commtm Dis2013，45，12： | 1 |
| 3 | Predicting surface strains at the human distal radius during an in vivo loading task-finite element model validation and application显示文摘 | Varun A Bhatia W Brant Edwards Karen L Troy | 2014 | Journal of Biomechanics2014，47，11： | 1 |
| 4 | Postnatally acquired dengue in a neonate--a case report显示文摘 | Kanwaljeet KC Varun S Anita A | 2013 | J Commun Dis2013，45，12： | 1 |
| 5 | Experimental Investiga- tion of Centrifugal Pump Working as Turbine for Small Hydropower Sys- tems 显示文摘 | Nautiyal H Varun V Kumar A | 2011 | Energy Science and Technology2011，1，1： | 1 |
| 6 | Simultaneous Optimization of WEDM Responses Using Grey Relational Analysis Coupled with Genetic Algorithm while Machining EN 353 显示文摘 | VARUN A VENKAIAH N | 2015 | The International Journal of Advanced Manufacturing Technology2015，76，1： | 1 |
| 7 | Reverse running pumps analytical, experimental and computational study: a re- view 显示文摘 | NAUTIYAL H VARUN KUMAR A | 2010 | Renewable and Sustainable Energy Reviews2010，14，7： | 1 |
| 8 | Experimental investi- gation of centrifugal pump working as turbine for small hydro- power systems显示文摘 | HIMANSHU N VARUN KUMAR A | 2011 | Energy Science and Technology2011，1，1： | 1 |
| 9 | Experimental investigation of centrifugal pump working as turbine for small hydropower systeras显示文摘 | NAUTIYAL H VARUN KUMAR A | 2011 | Energy Science and Technology2011，1，1： | 1 |
| 10 | Retreat of Himalayan glaciers-indicator of climate change显示文摘 | Ashish A Varun J Archana S | 2006 | Nature and Science2006，4，4： | 1 |
| 11 | A facile approach to substituted acrylates by regioselectiveand stereoselective addition of thiols and aminestoanalkynylesterinwater显示文摘 | Nitin A Varun K R Vipin A | | 0，，： | 1 |
| 12 | Experimental investi- gation of centrifugal pump working as turbine for small hydro- power systems 显示文摘 | NAUTIYAL H VARUN KUMAR A | 2011 | Energy Science and Technology2011，1，1： | 1 |
| 13 | Experimental investigation of centrifugal pump working as turbine for small hydropower systems 显示文摘 | NAUTIYAL H VARUN A K YADAV S | 2011 | Energy Science and Technology2011，1，1： | 1 |
| 14 | Life cycle assess- ment of solar PV based electricity generation systems: A review 显示文摘 | Sherwani A F Usmani J A Varun | 2010 | Renewable and Sustainable Energy Reviews2010，14，1： | 1 |
| 15 | Albuminuria and renal function in obese adults evaluated for obstructive sleep apnea显示文摘 | Varun A Thomas E V Baroon R | 2009 | Nephron Clin Pract2009，113，3： | 1 |
| 16 | A Citation Analysis of the Evolution and State of Information Systems Within a Constel- lation of Reference Disciplines显示文摘 | Varun G Ramakrishn A Rahul G | 2006 | Journal of the Association for Information Systems2006，7，5： | 1 |
| 17 | Quantitative imaging of single upconversion nanopartieles in biological tissue显示文摘 | Nadort Annemarie Sreenivasan Varun K A Song Zhen | 2013 | Plos One2013，8，5： | 1 |
| 18 | Effect of groove design on mechan- ical and metallurgical properties of quenched and tempered low alloy abrasion resistant steel welded joints 显示文摘 | Varun Sharma Shabi A S | 2014 | Materials and Design2014，53，： | 1 |
| 19 | Albu- minuria and renal function in obese adults evaluated for obstructive sleep apnea显示文摘 | VARUN A THOMAS E V BAROON R | 2009 | Nephron Clin Pract2009，113，3： | 1 |
| 20 | Reducing unnecessary crossmatching for hip fracture patients by accounting for preoperative hemoglobin concentration显示文摘BACKGROUND Maximum surgical blood order schedules were designed to eliminate unnecessary preoperative crossmatching prior to surgery in order to conserve blood bank resources.Most protocols recommend type and cross of 2 red blood cell(RBC)units for patients undergoing surgery for treatment of hip fracture.Preoperative hemoglobin has been identified as the strongest predictor of inpatient transfusion,but current maximum surgical blood order schedules do not consider preoperative hemoglobin values to determine the number of RBC units to prepare prior to surgery.AIM To determine the preoperative hemoglobin level resulting in the optimal 2:1 crossmatch-to-transfusion(C:T)ratio in hip fracture surgery patients.METHODS In 2015 a patient blood management(PBM)program was implemented at our institution mandating a single unit-per-occurrence transfusion policy and a restrictive transfusion threshold of<7 g/dL hemoglobin in asymptomatic patients and<8 g/dL in those with refractory symptomatic anemia or history of coronary artery disease.We identified all hip fracture patients between 2013 and 2017 and compared the preoperative hemoglobin which would predict a 2:1 C:T ratio in the pre PBM and post PBM cohorts.Prediction profiling and sensitivity analysis were performed with statistical significance set at P<0.05.RESULTS Four hundred and ninety-eight patients who underwent hip fracture surgery between 2013 and 2017 were identified,291 in the post PBM cohort.Transfusion requirements in the post PBM cohort were lower(51%vs 33%,P<0.0001)than in the pre PBM cohort.The mean RBC units transfused per patient was 1.15 in the pre PBM cohort,compared to 0.66 in the post PBM cohort(P<0.001).The 2:1 C:T ratio(inpatient transfusion probability of 50%)was predicted by a preoperative hemoglobin of 12.3 g/dL[area under the curve(AUC)0.78(95%confidence interval(CI),0.72-0.83),Sensitivity 0.66]in the pre PBM cohort and 10.7 g/dL[AUC 0.78(95%CI,0.73-0.83),Sensitivity 0.88]in the post PBM cohort.A 50%probability of requiring>1 RBC unit was predicted by 11.2g/dL[AUC 0.80(95%CI,0.74-0.85),Sensitivity 0.87]in the pre PBM cohort and 8.7g/dL[AUC 0.78(95%CI,0.73-0.83),Sensitivity 0.84]in the post-PBM cohort.CONCLUSION The hip fracture maximum surgical blood order schedule should consider preoperative hemoglobin in determining the number of units to type and cross prior to surgery. | Raj M Amin Varun Puvanesarajah Yash P Chaudhry Matthew J Best Sandesh S Rao Steven M Frank Erik A Hasenboehler | 2021 | World Journal of Orthopedics2021，12，5： | 0 |
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