The Risk of Upper Urinary Tract Involvement in Patients With Ketamine-Associated Uropathy / 대한배뇨장애요실금학회지

PURPOSE: The aims of this study were to investigate the prevalence of upper tract involvement in ketamine-associated uropathy, and to determine the predictors of hydronephrosis in patients with a history of ketamine abuse. METHODS: This was a cross-sectional study of a prospective cohort of patients with ketamine-associated uropathy. Data including demographics, pattern of ketamine abuse, pelvic pain and urgency or frequency (PUF) symptom score, uroflowmetry (UFM) parameters, serum renal function, and liver function tests were collected. Upon consultation, ultrasonography was performed to assess the function of the urinary system. RESULTS: From December 2011 to October 2015, we treated 572 patients with ketamine-associated uropathy. Of these patients, 207 (36.2%) had managed to achieve abstinence at the time of their first consultation. Ninety-six patients (16.8%) in the cohort were found to have hydronephrosis on ultrasonography. Univariate analysis identified age, duration of ketamine abuse, PUF symptom score, voided volume on UFM, serum creatinine levels >100 μmol/L, and an abnormal serum liver enzyme profile as factors associated with hydronephrosis. Logistic regression revealed the following parameters to be statistically related to hydronephrosis: age (adjusted odds ratio [OR], 1.090; 95% confidence interval [CI], 1.020–1.166; P=0.012), functional bladder capacity (adjusted OR, 0.997; 95% CI, 0.995–0.999; P=0.029), serum creatinine >100 μmol/L (adjusted OR, 3.107; 95% CI, 1.238–7.794; P=0.016, and an abnormal serum liver enzyme profile (adjusted OR, 1.967; 95% CI, 1.213–3.187; P=0.006). CONCLUSIONS: Ketamine-associated uropathy can involve the upper urinary tract. Patient demographics as well as investigations of UFM, renal function tests, and liver function tests may allow us to identify at-risk patients.

Effects of low-magnitude high-frequency vibration on osteoporotic fracture complicated by closed arterial injuries / 医用生物力学

Objective To investigate the effects of low-magnitude high-frequency vibration (LMHFV) on osteoporotic fracture healing and blood supply of distal injured limbs based on osteoporosis fracture model of the ovariectomized (OVX) rats. Methods Ovariectomy was performed in 32 six-month-old female SD rats. 3 months later, closed transverse fractures were created at the right femoral midshafts complicated by femoral artery injuries. The rats were then randomly divided into vibration group and control group. Radiographs were performed in each week to assess the callus size and the status of fracture healing. At 2nd, 4th and 8th week after treatment, pulsed-wave Doppler ultrasonography was utilized to evaluate the blood flow velocity and the resistance index (RI) of the distal femoral artery in injured limbs. The peri-fracture region was reconstructed by Micro-CT for both qualitative and quantitative analysis. Results Pulsed-wave Doppler indicated a significantly higher peak systolic velocity of distal femoral artery in vibration group at 2nd and 4th week (P<0.05) and a lower RI as compared with control group.Radiography and Micro-CT analysis demonstrated that vibration group had better callus formation, mineralization, remodeling, and bridging rate during fracture healing as compared with control group. Conclusions LMHFV can effectively improve the blood supply of distal injured limbs and promote the osteoporotic fracture healing.

Evaluation of heart and liver iron deposition status in patients with β- thalassemia intermedia and major with MRI T2* technique / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the status of iron deposition in patients with β-thalassemia intermedia and major in mainland China.</p><p><b>METHODS</b>The status of transfusion and chelation was examined in 39 patients with β-thalassemia intermedia or major. Serum ferritin levels were measured. MRI T2* technique was used to detect cardiac and hepatic iron deposition.</p><p><b>RESULTS</b>Serum ferritin levels ranged from the minimum of 1500 ng/mL up to a maximum of 11491 ng/mL. From liver MRI T2* measurement, 15 cases had severe hepatic iron deposition (38%) and moderate deposition was found in 15 cases (38%), mild in 7 cases (18%), and normal in 2 cases (5%). Heart MRI T2* showed severe heart iron deposition in 7 cases (18%), mild in 5 cases (13%), and normal in 27 cases (69%). One case had cardiac arrhythmia. Four cases were over 20 years of age, and presented with gonadal function hypoplasia. The majority of patients did not receive regular transfusion and they had delayed, suboptimal chelation due to financial problems. Serum ferritin level was closely related with timing and dosage of chelation.</p><p><b>CONCLUSIONS</b>In patients with β-thalassemia who do not receive early regular transfusion and iron chelation therapy, iron deposition may occur at an early age. Important organs and tissue functional lesions and related complications also result. Relevant agencies and family members should be aware of this trend and develop appropriate strategies to improve the medical condition and quality of life of patients with this disorder.</p>

Modified Radiology-Guided Percutaneous Gastrostomy (MRPG) for Patients with Complete Obstruction of the Upper Digestive Tract and Who are without Endoscopic or Nasogastric Access

OBJECTIVE: We wanted to report on our experience with modified radiology-guided percutaneous gastrostomy (MRPG) without endoscopic or nasogastric access for treating patients with complete obstruction of the upper digestive tract. MATERIALS AND METHODS: Fourteen oncology patients (13 had hypopharyngeal cancer and 1 had upper esophageal cancer) with complete obstruction of the upper digestive tract were recruited. Conventional percutaneous endoscopic gastrostomy (PEG) and radiologic (fluoroscopy-guided) percutaneous gastrostomy (RPG) were not feasible in all the patients. An MRPG technique (with a combination of ultrasound, an air enema and fluoroscopic guidance) was performed in these patients. RESULTS: We achieved successfully percutaneous gastrostomy using the modified technique in all patients without any major or minor complications after the procedure. CONCLUSION: A modified radiology-guided percutaneous gastrostomy technique can be safely performed in patients who failed to receive conventional PEG or RPG due to the absence of nasogastric access in the completely obstructed upper digestive tract.