A prospective study of iliotibial band strain in runners

BACKGROUND: Iliotibial band syndrome is the leading cause of lateral knee pain in runners. It is thought that pain develops from strain on the iliotibial band due to friction of the iliotibial band sliding over the lateral femoral epicondyle. The purpose of this study was to investigate mechanical strain in the iliotibial band as a possible causative factor in the development of iliotibial band syndrome. METHODS: From a large prospective study, female runners who incurred iliotibial band syndrome during the study were compared to a control group who incurred no injuries. Strain, strain rate and duration of impingement were determined from a musculoskeletal model of the lower extremity. FINDINGS: The results indicated that the iliotibial band syndrome subjects exhibited greater strain throughout the support period, but particularly at midsupport compared to the control group. Strain rate was significantly greater in the iliotibial band syndrome group compared to the control group and was greater in the involved limb of the iliotibial band syndrome group compared to their contralateral limb. However, there were no differences in the duration of impingement between the groups. INTERPRETATION: This study indicates that a major factor in the development of iliotibial band syndrome is strain rate. Therefore, we suggest that strain rate, rather than the magnitude of strain, may be a causative factor in developing iliotibial band syndrome. The effect size (>0.5) indicated that strain rate may be biologically significant in the etiology of iliotibial band syndrome.     

Effects of iliotibial band syndrome on pain sensitivity and gait kinematics in female runners: A preliminary study

BackgroundRunners with iliotibial band syndrome display symptoms similar to chronic tendinopathy and distinct gait patterns compared to healthy controls. Although altered pain processing has been demonstrated in chronic tendinopathies, central pain processing and its relationship to motor control has not been measured in iliotibial band syndrome. The purpose of this study was to examine pain sensitivity, hip strength, and gait kinematics in runners with and without iliotibial band syndrome.MethodsNine female runners with iliotibial band syndrome and eight healthy controls participated. Subjective pain was reported and pressure pain threshold measured at the bilateral foot, tibialis anterior, contralateral hand. Isometric hip strength was assessed. Three-dimensional joint angles were collected while running. Differences in pain and strength were determined using 1-way ANOVAs. Discrete hip and knee joint angles during stance phase were calculated and waveform analysis performed.FindingsRunners with iliotibial band syndrome exhibited bilaterally diminished pain at the foot (injured-limb: 1.54 (SD = 0.51); non-injured limb: 1.54 (SD = 0.55); control: 4.01 (SD = 2.30) kg, P < .001) and ipsilateral tibialis anterior (injured-limb: 2.33 (SD = 1.10); control: 6.13 (SD = 4.89) kg, P = .03). Hip strength was not different between groups. Runners with iliotibial band syndrome had greater hip adduction at touchdown, knee internal rotation during loading, and knee abduction and flexion at toe-off than controls.InterpretationRunners with iliotibial band syndrome demonstrated expanded somatic pain sensitivity without hip strength differences, but concomitant with altered gait patterns. Bilateral pain symptoms and gait deviations exist in runners with iliotibial band syndrome even with unilateral symptoms, highlighting the importance of bilateral assessment.     

Real-time morphologic changes of the iliotibial band during therapeutic stretching; an ultrasonographic study

The purpose of this study was to evaluate the utility of ultrasonography (US) in determining the morphological changes of the iliotibial band (ITB) with the modified Ober maneuver. Forty-four subjects (23 men and 21 women, mean age (± SD), 24.7±4.7 years) who had no previous history of lower back, gluteus, hip or knee pain and satisfied additional inclusion criteria were recruited. Twenty out of the 44 subjects were initially examined by both MRI and US for measurement confirmation. Band width of the left ITB (the measures of which were highly correlated between techniques) was then assessed for these 44 subjects by US with the modified Ober maneuver in three gradually increased hip adduction positions; neutral, adducted and adducted with weight in these 44 subjects. In addition, examiner reliability was assessed by conducting duplicate measurements in 20 randomly chosen subjects. Results demonstrated that measures of band width, but not thickness, were highly correlated between MRI and US (p<0.001, r=0.850). Significant reductions in band width were observed between the three positions with the modified Ober maneuver (p<0.001). Intratester reliability was high (intraclass correlation coefficient (ICC)=0.86–0.94). Band width changes indicated that the ITB was subjected to a significant stretching force during hip adduction. We conclude that US is a reliable means to directly assess the real-time effects of stretching exercises.     

Cardiopulmonary resuscitation in a hospitalized population: prospective study of factors associated with outcome

A prospective study of advanced cardiopulmonary resuscitation (CPR) was carried out on 226 patients in order to examine factors predicting successful resuscitation and 6 month survival. The mean age of all patients was 70 years and median age was 74. Cardiopulmonary resuscitation was successful in 40.5% (137) of all arrests and in 48.7% (110) of the first arrests. Thirty of 207 patients with one or more cardiac arrests were discharged alive (14%). Twenty-one of our patients were alive at 6 months (10.3%). Patients in ventricular fibrillation and/or ventricular tachycardia at the time of arrest were more likely to have successful outcomes. When the patient required Isuprel or bicarbonate, cardiopulmonary resuscitation was significantly less successful. We found no correlation of immediate outcome with the following variables: location of arrest; time of day; pre-existence of shock; coma; stroke; malignancy. Uremia and/or chronic obstructive pulmonary disease was not significantly associated with failed resuscitation. Most notable in our results of specific treatments was the evidence for the need to improve the initial pH, particularly when it was less than 7.2. Failure to do so by the time the second blood gas was drawn was associated with failure of cardiopulmonary resuscitation. Our results also suggest that the adequate treatment of metabolic acidosis, and improved ventilatory management with improved PO2 and optimization of PCO2, play a role in the better outcome of cardiopulmonary resuscitation.     

Campylobacter pylori: prospective analysis of clinical and histological factors associated with colonization of the upper gastrointestinal tract

The association of Campylobacter pylori (C.p.) colonization of the upper gastrointestinal tract with five predefined anamnestic variables, seven symptoms of dyspepsia, and various blindly evaluated histological criteria, was prospectively investigated in a consecutive series of 149 patients submitted to upper gastrointestinal tract endoscopy. Colonization was determined by biopsy urease tests and histological searches. Significant differences (P less than 0.05) between C.p.-positive and C.p.-negative patients were found for smoker status and the frequency of therapy with ulcer-healing drugs (positive association with C.p.) and antibiotics (negative association), but not for any other of the anamnestic data or symptoms. These data were further submitted to stepwise multiple logistic regression analyses. Concerning histological findings, C.p. colonization was significantly associated with the degree of antrum and body gastritis (P less than 0.01), and also with lymphocellular infiltration in antrum and body biopsies and neutrophil cellular grading in gastric antra. We conclude that C.p. colonization of the upper gastrointestinal tract is associated with gastritic change of the antrum and, albeit to a lesser extent, of the body mucosa. However, a specific pattern of symptoms to predict C.p. colonization could not be established.     

Gender differences in symptom predictors associated with acute coronary syndrome: A prospective observational study

Signs and symptoms (typical and atypical symptoms) of acute coronary syndromes (ACS) differ between men and women. Identification of gender differences has implications for both health care providers and the general public. The aim of this study was to determine the symptom predictors of the acute coronary syndromes in men and women. In this prospective study, nurse data collectors directly observed 256 men and 182 women (N = 438) with symptoms suggestive of ACS in the Emergency Departments of eight hospitals in Tehran. ACS was eventually diagnosed in 183 (57.2%) men and 137 (42.8%) women on the basis of standard electrocardiogram and cardiac enzyme (CPK-MB) level. In men, chest symptoms (OR = 3.22, CI = 0.137–0.756, P = 0.009), dyspnea (OR = 2.65, CI = 1.78–4.123 P = 0.001) and diaphoresis (OR = 2.175, CI = 1.020–4.639, P = 0.044) were significantly associated with the diagnosis of ACS 3.78, 2.72 and 1.87 times more than in women having these symptoms, respectively. These results indicated that chest symptoms, diaphoresis and dyspnea were the more pronounced typical symptoms of ACS in men compared to women. Additionally, the numbers of typical symptoms can be considered as more predictive of ACS in men (OR = 1.673, CI = 1.211–2.224, P < 0.001) than women (OR = 1.271, CI = 1.157–2.331, P = 0.212). Therefore, clinicians need to take men showing typical symptoms into consideration carefully.     

A prospective study of factors associated with delayed discharge in school-aged children undergoing ward-based minor surgery

This study found a high rate of post-operative overnight stay in a group of 93 children aged between 5 and 12 years admitted to a paediatric ward for day-case procedures. Those children detained were older, had had later operations, were more worried pre-operatively and had been less happy about going to school than were children discharged on the day of surgery. Social factors, maternal worries and pre-medication also predicted delayed discharge.

At a follow-up there were no differences between the day-case and in-patient groups in terms of children's psychological outcome but difficulties associated with ward-based day-case surgery were highlighted.     

与肾小球滤过率相关的临床因素探讨

目的：探讨肾小球滤过率（GFR）与多种临床因素的相关关系。方法：用^99mTc-DTPA清除率测定46例肾功能正常组和52例肾功能不全组患者的GFR，同时采血测血清肌酐（SCr）、尿素氮（BUN）、尿酸、钾、钠、钙、血红蛋白，并测心率、尿质量比、24h尿蛋白定量、平均动态压、体重指数、体表面积，记录测试者年龄，测定GFR所用同位素剂量。将各组及不同原发病的GFR分别与同组的上述各临床因素进行简单相关分析，对与GFR有显著相关关系的上述临床因素再与GFR进行多元相关分析。结果：在肾功能正常、肾功能不全及不同原发病者中，除例数较少的病种外，其GFR始终与SCr呈显著负相关，而与其他临床因素的相关关系则不相同。结论：在多种原发病引起的肾功能不全及肾功能正常者中，SCr是反映GFR的理想指标。     

A prospective study to identify the risk factors associated with acute reactions to platelet and red cell transfusions

It is generally assumed that febrile nonhemolytic transfusion reactions are an immunologically mediated reaction involving the recipient's plasma and the white cells in the donor unit. This has led to the use of white cell reduction and pretransfusion medication, to try to minimize these reactions. To better understand febrile transfusion reactions, a prospective study was performed in which all patients receiving platelet and red cell transfusions in a tertiary-care medical center were interviewed before and after transfusion to obtain information about the typical presentation of the syndrome. It was found that transfusion reactions were much more frequently associated with platelet transfusion (30.8%) than with red cell transfusion (6.8%, p < 0.0005). The routine use of antipyretics prevented most episodes of fever but did not prevent the occurrence of other symptoms such as chills, cold, and discomfort. The application of logistic regression analysis revealed that the dominant factor determining the risk of a reaction was not white cell contamination, but the age of the component (p < 0.005). The significant relationship between reaction and the increasing age of the component suggests that cytokines released in the component during storage may be responsible for many reactions to blood components.     

A prospective study of adverse reactions associated with vancomycin therapy

A prospective evaluation of the efficacy and safety of vancomycin was conducted in 54 consecutive patients over a 16-month period. Vancomycin was curative in 95% of 43 patients with proven infection. Drugs were ceased in six patients because of adverse reactions; in three of these vancomycin was considered the likely cause. Reactions included thrombophlebitis (20 of 54 patients), rash (4 of 54), nephrotoxicity (4 of 50), proteinuria (1 of 50) and ototoxicity (1 of 11 patients tested by audiometry). Thrombophlebitis occurred only with infusion through peripheral cannulae; nephrotoxicity and ototoxicity were confined to patients receiving an aminoglycoside plus vancomycin. We conclude that vancomycin, administered appropriately, constitutes safe, effective therapy for infections caused by susceptible bacteria.     

A clinical observational study analysing the factors associated with hyperventilation during actual cardiopulmonary resuscitation in the emergency department

Aim

This is the first study to identify the factors associated with hyperventilation during actual cardiopulmonary resuscitation (CPR) in the emergency department (ED).

Methods

All CPR events in the ED were recorded by video from April 2011 to December 2011. The following variables were analysed using review of the recorded CPR data: ventilation rate (VR) during each minute and its associated factors including provider factors (experience, advanced cardiovascular life support (ACLS) certification), clinical factors (auscultation to confirm successful intubation, suctioning, and comments by the team leader) and time factors (time or day of CPR).

Results

Fifty-five adult CPR cases including a total of 673 min sectors were analysed. The higher rates of hyperventilation (VR > 10/min) were delivered by inexperienced (53.3% versus 14.2%) or uncertified ACLS provider (52.2% versus 10.8%), during night time (61.0 versus 34.5%) or weekend CPR (53.1% versus 35.6%) and when auscultation to confirm successful intubation was performed (93.5% versus 52.8%) than not (all p < 0.0001). However, experienced (25.3% versus 29.7%; p = 0.448) or certified ACLS provider (20.6% versus 31.3%; p < 0.0001) could not deliver high rate of proper ventilation (VR 8–10/min). Comment by the team leader was most strongly associated with the proper ventilation (odds ratio 7.035, 95% confidence interval 4.512–10.967).

Conclusions

Hyperventilation during CPR was associated with inexperienced or uncertified ACLS provider, auscultation to confirm intubation, and night time or weekend CPR. And to deliver proper ventilation, comments by the team leader should be given regardless of providers’ expert level.     

Clinical factors associated with initiation of renal replacement therapy in critically ill patients with acute kidney injury-a prospective multicenter observational study

Purpose

Our objective was to describe the current practice for initiation of RRT in this population. There is uncertainty regarding the optimal time to initiate renal replacement therapy (RRT) in critically ill patients with acute kidney injury (AKI).

Methods

Prospective study of patients receiving RRT in 6 intensive care units (ICUs) at 3 hospitals from July 2007 to August 2008. We characterized factors associated with start of RRT and evaluated their relationship with mortality.

Results

We included 234 patients. RRT was initiated 1 day (0-4) after ICU admission (median [interquartile range]). Median creatinine was 331 μmol/L (225-446 μmol/L), urea 22.9 mmol/L (13.9-32.9 mmol/L), and RIFLE-Failure in 76.9%. Of traditional indications, Pao₂/Fio₂ < 200 (54.5%) and oliguria (32.9%) were most common. ICU and hospital mortality were 45.3% and 51.9%, respectively. In adjusted analysis, mortality at RRT initiation was associated with creatinine <332 μmol/L (odds ratio [OR] 2.8; 95% confidence interval [CI] 1.5-5.4), change in urea from admission >8.9 mmol/L (OR 1.8; 95% CI, 1.0-3.4), urine output <82 mL/24 hours (OR 3.0; 95% CI, 1.4-6.5), fluid balance >3.0 L/24 hours (OR 2.3; 95% CI, 1.2-4.5), percentage of fluid overload >5% (OR 2.3; 95% CI, 1.2-4.7), 3 or more failing organs (OR 4.5; 95% CI, 1.2-4.2), Sequential Organ Failure Assessment score >14 (OR 2.3; 95% CI, 1.3-4.3), and start 4 days or more after admission (OR 4.3; 95% CI, 1.9-9.5). Mortality was higher as factors accumulated.

Conclusion

In ICU patients requiring RRT, there was marked variation in factors that influence start of RRT. RRT initiation with fewer clinical triggers was associated with lower mortality. Timing of RRT may modify survival but requires appraisal in a randomized trial.     

Metabolic syndrome and other factors associated with increased risk of diabetes

The prevalence of diabetes has increased dramatically in the last 3 decades. Metabolic syndrome is a strong risk factor for incident diabetes. Among components of metabolic syndrome, obesity and abnormal carbohydrate metabolism are the most significant predictors. Primary care physicians should identify patients at risk and monitor their fasting glucose and/or postprandial glucose to enable timely diagnosis of diabetes and appropriate interventions. Lifestyle interventions that help reduce body weight and pharmacologic interventions that address insulin resistance and/or postprandial glycemia may help prevent diabetes. Intensive cardiovascular risk factor management should be an integral component of any diabetes prevention plan.     

系统性红斑狼疮合并肺动脉高压的预后影响因素的初步探讨

目的探讨影响系统性红斑狼疮合并肺动脉高压预后的相关因素。方法采用回顾性队列研究的策略，研究样本为1997年1月至2008年1月在中山大学附属第一医院风湿免疫科住院的SLE—PAH连续性病例。采用Kaplan—Meier法刻画生存曲线，Cox比例危险率回归模型分析影响预后的的因素。结果本研究人组40例，共有37例（92．5％）完成随访。其中有7例（18．9％）死亡（阳性结局），随访结束时间是2008年8月。平均随访时间为（26．68±14．79）个月。COX多因素分析显示对预后有影响的因素有：LVEF减小（HR=15．06，95％CI：1．778～127．64，P=0．013）、NYHA心功能分级（HR=11．805，95％CI：1．628—85．61，P=0．015）、诊断PAH后使用大剂量CTX（HR=0．094，95％CI：0．014～0．65，P=0．017）。结论LVEF减小、心功能差是预测死亡的阳性因子。大剂量环磷酰胺的使用可改善预后。     

Eight-month prospective study of 14 patients with hospital-acquired severe acute respiratory syndrome

OBJECTIVE: To define the clinical characteristics and clinical course of hospital-acquired severe acute respiratory syndrome (SARS). PATIENTS AND METHODS: This 8-month prospective study of 14 patients with hospital-acquired SARS in Taipei, Taiwan, was conducted from April through December 2003. RESULTS: The most common presenting symptoms in our 14 patients with hospital-acquired SARS were fever, dyspnea, dizziness, malaise, diarrhea, dry cough, muscle pain, and chills. Lymphopenia and elevated serum levels of lactate dehydrogenase (LDH) and C-reactive protein (CRP) were the most common Initial laboratory findings. Initial chest radiographs revealed various pattern abnormalities and normal results. Five of the 14 patients required mechanical ventilation. The need for mechanical ventilation was associated with bilateral lung involvement on the initial chest radiograph and higher peak levels of LDH and CRP. Clinical severity of disease varied from mild to severe. At 8 months after disease onset, patients with mild or moderate SARS had normal findings or only focal fibrosis on chest high-resolution computed tomography. However, bilateral fibrotic changes remained in the 4 patients who had recovered from severe SARS, 1 of whom had mild restrictive ventilatory impairment. One patient with severe SARS died; she was elderly and had other comorbidities. Five additional patients had reduced diffusing capacity. CONCLUSION: The clinical picture of our patients presenting with hospital-acquired SARS revealed atypical pneumonia associated with lymphopenia, elevated serum levels of LDH, rapid clinical deterioration, and lack of response to empirical antibiotic therapy. Substantially elevated levels of LDH and CRP correlated with severe illness requiring mechanical ventilatory support. In those receiving mechanical ventilation, pulmonary function was only mildly reduced at 6 to 8 months after acute illness, consistent with the natural history of acute respiratory distress syndrome due to other causes.     

多发伤并发持续炎症-免疫抑制-分解代谢综合征患者的临床特征及预后分析

目的:研究多发伤并发持续炎症-免疫抑制-分解代谢综合征(persistent inflammation, immunosuppression and catabolism syndrome, PICS)患者的临床特征及预后。方法:分析2019年1月至2020年7月间收治于同济医院创伤外科的1 083例多发伤患者的临床资...