Discriminating between maximal and feigned isokinetic knee musculature performance using waveform similarity measures

Background

Muscle strength test outcomes may aid in determination of impairment or disability rating following injury. In such settings, verification of participant effort during testing is imperative. This investigation explored the utilization of within-set moment waveform similarity measures, namely cross correlation and percent root mean square difference scores, to develop decision rules for discriminating between maximal and feigned efforts during isokinetic testing of the knee joint musculature.

Methods

A mixed-gender sample of 46 participants performed non-reciprocal sets of maximal or feigned knee extension and flexion concentric and eccentric efforts at testing velocities of 30°s^–1 and 120°s^–1. Logistic regression and Monte Carlo simulations were used to derive decision rules for differentiating between the two effort types.

Findings

Employing cutoff scores corresponding to 100% specificity; sensitivities of the knee extensor's velocity-specific decision rules were 92.4% and 84.8%, respectively. The velocity-specific knee flexor's test sensitivities were 56.5% and 46.7%.

Interpretation

Utilizing the proposed decision rules, substantiating maximal effort performance of the knee extensors may be possible using this specific testing protocol. However, the proposed methods are limited in their ability to verify performance of maximal knee flexor efforts.     

Morbidity and mortality with nonmyeloablative compared with myeloablative conditioning before hematopoietic cell transplantation from HLA-matched related donors

Nonmyeloablative regimens for allogeneic hematopoietic cell transplantation (HCT) have been developed for patients ineligible for myeloablative conditioning. We compared regimen-related toxicities (RRTs) and nonrelapse mortality (NRM) in 73 nonmyeloablative and 73 myeloablative recipients of HLA-matched related donor HCT, using the National Cancer Institute (NCI) Common Toxicity Criteria. Nonmyeloablative regimens were 2 Gy total body irradiation (TBI), either alone (n = 40) or combined with fludarabine, 30 mg/m(2)/d for 3 days (n = 33). Posttransplantation immunosuppression included mycophenolate mofetil and cyclosporine. Myeloablative regimens consisted mostly of cyclophosphamide + TBI or busulfan + cyclophosphamide, followed by posttransplantation methotrexate and cyclosporine. Nonmyeloablative patients were at higher risk than ablative patients because of greater age, longer time from diagnosis to HCT, more frequent preceding high-dose HCT, and higher pretransplantation Charlson comorbidity scores. Nevertheless, they experienced significantly less severe toxicities in 7 organs/systems: hematologic, gastrointestinal, hepatic, hemorrhage, infection, metabolic, and pulmonary. This translated into less NRM at day 100 (3% versus 23%, P = 10(-4)) and 1 year (16% versus 30%, P =.04). In multivariate analysis, the strongest factor predicting lessened RRT and NRM was nonmyeloablative conditioning, whereas high pretransplantation comorbidity scores predicted higher NRM. In conclusion, nonmyeloablative regimens had lower RRT and NRM and could be considered for comparative studies, including younger patients with more favorable Charlson comorbidity scores.     

Hyperfunctional parathyroid carcinoma

The parathyroid cancer is mentioned in literature with an incidence of 0.5-5% in the etiology of the primary hyperparathyroidism. The authors present the case of a 45 year old female with diagnosis of "primary hyperparathyroidism" based on clinical, ultrasonographic and biochemical investigations. A right superior adenoma of 3 x 2 x 1 cm (150 mg) has been found and extirpated. The histological examination showed an adenoma with predominant "chief" cells. Three years after surgery the patient had a recurrence of the clinical and hypercalcemie syndrome (with more severe damages). The surgical reexploration showed the right thyroid lobe with a nodular aspect and in its inferior pole a enlarged parathyroid gland of one cm size was found. An en-block exeresis including the right thyroid lobe with isthmus as well as the mentioned lesion and the half of left superior parathyroid, the left inferior one together with retrosternal fat tissue have been performed. Frozen sections completed by paraffin examination established the diagnosis of hyperfunctioning parathyroid carcinoma. We have emphasize the issues that could suggest the initially preoperative true diagnosis: the large size of excised adenoma and the relatively quick recurrence of the phenomena of parathyroid hyperfunction. The surgical principles and strategies in the treatment of parathyroid cancer are also discussed.     

Upper digestive hemorrhage, physiopathologic and therapeutical considerations

The study is based on the analysis of 158 patients admitted in the "Fourth Clinic of Surgery" with diagnosis of "Upper Digestive Haemorrhage" (U.D.H.) between 1998-2002, emphasising the importance of the physiopathological chains induced by the ulcer bleeding; 119 cases (76%) were diagnosed with gastro-duodenal ulcer, 20 with portal hypertension (20%), 14 subjects were with gastric carcinoma (8.8%) and 5 with miscellaneous etiologies so called "rare circumstances" of U.D.H. (two patients with Idiopathic Thrombocytopenia, one case with Dieulafoy gastric ulceration and two subjects with Haemorrhagic Gastritis). All the patients were admitted in the first moment in the Intensive Care Unit where haemostasis were successfully obtained with drug therapy adapted to the physiopathological changes induced by bleeding, in the majority of cases with light bleeding (8 cases, 5.4%) or medium bleeding (139 patients, 87.4%); only in 9 subjects (6%) with severe haemorrhage surgery was indicated (posterior bulbar ulcer in which the surgical haemostasis was necessary). In 88 patients (55%) surgery was performed as an elective procedure--74 from them had haemorrhagic gastric or duodenal ulcers with a medium amount of bleeding and 14 observations for gastric carcinoma with a chronic bleeding. In most all the cases the postoperative evolution was in good terms. Two observations with severe U.D.H. due to rupture of esophageal varices occurred on hepatic cirrhosis were out of therapeutical proof (1.2% deaths from all the admitted patients with U.D.H.).     

Could the burden of pancreatic cancer originate in childhood?

The presence of pancreatic cancer during childhood is extremely rare, and physicians may be tempted to overlook this diagnosis based on age criteria. However, there are primary malignant pancreatic tumors encountered in pediatric patients, such as pancreatoblastoma, and tumors considered benign in general but may present a malignant potential, such as the solid pseudo-papillary tumor, insulinoma, gastrinoma, and vasoactive intestinal peptide secreting tumor. Their early diagnosis and management are of paramount importance since the survival rates tend to differ for various types of these conditions. Many pediatric cancers may present pancreatic metastases, such as renal cell carcinoma, which may evolve with pancreatic metastatic disease even after two or more decades. Several childhood diseases may create a predisposition for the development of pancreatic cancer during adulthood; hence, there is a need for extensive screening strategies and complex programs to facilitate the transition from pediatric to adult healthcare. Nevertheless, genetic studies highlight the fact the specific gene mutations and family aggregations may be correlated with a special predisposition towards pancreatic cancer. This review aims to report the main pancreatic cancers diagnosed during childhood, the most important childhood diseases predisposing to the development of pancreatic malignancies, and the gene mutations associates with pancreatic malignant tumors.     

Laparoscopic hand-assisted splenectomy for hydatid cyst

Hydatid cyst of the spleen is a rare location even in endemic areas. From classical splenectomy, surgical treatment has evolved to more conservative and even minimal invasive techniques. The authors report a 44 year old male with a palpable but asymptomatic mass in the left hypochondrium. Ultrasonography and computed tomography confirmed a large round unilocular cystic imagine of 12.5 cm in diameter with a thin regular wall. A total splenectomy was performed laparoscopic, the dissection being directed upward from the lower peritoneal attachments continuing with delivery of the anterior aspect of the hilum and splenorenal ligament, interception of main splenic vessels and finally detachment of the superior pole of the spleen where the cyst is adherent to the diaphragm muscle. The all delivered spleen was partial evacuated of hydatid content and the extraction was done via a mini-laparatomy with a digital lever manoeuvre. The 200 minutes operation has an uneventful postoperative course and the patient is still well 12 and 24 months after surgery without recurrence. The laparoscopic approach of hydatid cyst of the spleen constituted a challenging therapeutic perspective in selected cases and a good expertise of the surgeons.