This paper introduces the premarket registration procedures and the post market regulatory requirements in India. According to Indian medical device act and related medical regulations on medical device, this is a preliminary discussion on the registration management system to provide referance for foreign medical device to enter India market.
Equipment and Supplies ; economics ; standards ; India

The concept and classification of Korean medical device were introduced. The phases for Korea to import medical device include selecting Korean certification holder, hospital admittance, device marketing and supervision after marketing. China and other countries can find references to export medical devices into Korea.

Objective To study the expression of nitricoxide(NO) and intercellular adhesion molecule-1(ICAM-1) in the animals with hypercholesterolemia and atherosclerosis(AS) in order to investigate the relationship of hypercholesterolemia with AS and vascular endothelium function and ICAM-1. Methods Fed rabbits with high-cholesterol diet to establish the models of hypercholesterolemia and AS,and the control group was fed with normal diet;Blood was collected from vein in 0,8 and 16 weeks in two groups,and the concentrations of TC,LDL,NO and ICAM-1 were measured;The correlation among TC,LDL and NO,ICAM-1 was observed;After 16 weeks,the rabbits were put to death,and immunohistochemistry analysis and RT-PCR were performed to measure the expression of ICAM-1 in the aortas.Results TC and LDL in 8 weeks were higher in the high-cholestrol diet group,but NO and ICAM-1 had no change;NO decreased and ICAM-1 increased in 16 weeks(P

Objective To investigate the clinical features, brain imaging significance and the possible pathogenesis of posterior reversible encephalopathy syndrome (PRES) in childhood acute lymphoblastic leukemia (ALL) followed by chemotherapy induction.Methods The diagnosis and treatment of ALL were performed according to the guidelines of the Pediatric Association of Chinese Medical Association.There were 11 cases of pediatric ALL who developed PRES after chemotherapy induction.The clinical presentations, initial and follow-up radiologic features, and the neurologic outcomes of these 11 cases were investigated for one-year follow-up.All patients were reexamined 1,3,6, and 12 months after first imaging.Results Headache (10/1 1 cases), epileptic seizure (7/11 cases), high blood pressure (4/11 cases) ,visual impairment (6/11 cases) ,disturbance of consciousness (5/11 cases) and walking instability (2/11 cases) were the most common symptoms of these ALL patients with PRES.Magnetic resonance imaging (MRI) scanning revealed that lesions were mainly distributed in occipital lobe (9/11 cases), parietal lobe (8/11 cases), frontal lobe (5/11 cases) ,temporal lobe (3/11 cases), the deep white matter of bilateral periventricular and centrum semiovale (2/11 cases) and hemisphaerium cerebelli (1/11 cases).The radiological findings indicated that lesions had multifocal,symmetrical and posteriorly distributed characteristics in the cerebral hemispheres.After the diagnosis of PRES,patients stopped chemotherapy courses promptly and received symptomatic treatment, and then the clinical and imaging symptoms of most cases gradually disappeared.After 1-year follow-up,9 patients had good prognosis and no sequelae, 1 patient had symptomatic epilepsy (brain magnetic resonance imaging scan showed lesions in the left temporal lobe) ,and 1 patient had slight visual impairment.After the craniocerebral symptoms disappeared clinically ALL chemotherapy continued in all patients and no recurrent PRES was observed.Conclusions Although the clinical and imaging features of PRES may be diverse ,PRES should be recognized as a possible important complication of ALL when neurological symptoms appear.However, PRES is reversible when the patients are diagnosed and treated at an early stage.Thus,the occurrence of PRES should be considered and investigated to optimize the early induction schemes for ALL treatment.

Objective To explore the effects of different dose rates of X-ray under the same dose on cell clonogenic formation in non-small-cell lung cancer cell line A549 in order to provide experimental basis for clinical radiotherapy plan. Methods The A549 cells were cultured at low density and irradiated with X-rays at dose of 4 Gy and selected dose rates of 1, 2, 4 and 6 Gy/min, respectively, from a linear accelerator. The 8th day after irradiation, the cells were fixed and stained with Giemsa solution, and colonies containing at least 50 cells were counted. The plating efficiency and surviving fraction were calculated. Results The clonogenic number in non-irradiated cells was 88.6±4.6. The numbers were significantly reduced in irradiated cells at dose rate 1, 2, 4 and 6 Gy/min (12.3±3.4, 9.0±0.8, 5.6±1.0, 11.5±1.7, respectively) than that in non-irradiated control cells (F=678.799, P<0.05). The plating efficiencies were decreased in irradiated cells, especially in 4 Gy/min irradiated cells, which was lower than that in any of the other three dose rate groups (P< 0.05). Conclusions Though at same radiation dose, cancer cells have different clonogenic formation efficiency when irradiation with X-ray at different dose rates. Thus, treatment with optimal dose rate may improve the radiotherapy efficacy.

Objective To compare the efficacy and safety of induction therapy in 3+7 protocol and 3+10 protocol in children with acute myeloid leukemia (AML). Methods Two protocols were carried out in our hospital during January 2010 to January 2015, namely 3+7 protocol(AML-06,A group) and 3+10 protocol (modified AML protocol, B group). A total of 56 cases aged from 1 year-old to 13 year-old were enrolled in A group with male to female ratio at 31:25. Five of them were classified as FAB M1, 25 as M2, 11 as M4, 10 as M5, 2 as M6 and 3 as M7. Another 44 cases aged from 1 year to 12 years were enrolled in B group with a male to female ratio at 26:18, and 17 cases were classified as FAB M2, 14 as M4, 9 as M5, 2 as M6, and 2 as M7. Efficacy and adverse events were compared between the two groups. Results The complete remission rate (CR) of B group was 70.4%, while CR in A group was 48.2%. Considering the CR, 3+10 protocol showed higher efficacy than 3+7 protocol (P< 0.05). The major adverse event was bone marrow suppression. Treatment-related mortality (TRD) in A group was 1.8%, which was lower than that in B group (2.3%). The overall survival rate in A group was 75.0%, which was lower than that in B group (86.4%, P< 0.05). Conclusions The induction therapy of 3+10 protocol and 3+7 protocol showed effectiveness for AML treatment. The 3+10 protocol showed a higher CR than 3+7 protocol with no TRD increase, indicating that the 3+10 protocol should be recommended for AML treatment in children.

Objective:To investigate the effects of continuous renal replacement therapy (CRRT) on plasma concentration, clinical efficacy and safety of colistin sulfate.Methods:Clinical data of patients received with colistin sulfate were retrospectively analyzed from our group's previous clinical registration study, which was a prospective, multicenter observation study on the efficacy and pharmacokinetic characteristics of colistin sulfate in patients with severe infection in intensive care unit (ICU). According to whether patients received blood purification treatment, they were divided into CRRT group and non-CRRT group. Baseline data (gender, age, whether complicated with diabetes, chronic nervous system disease, etc), general data (infection of pathogens and sites, steady-state trough concentration, steady-state peak concentration, clinical efficacy, 28-day all-cause mortality, etc) and adverse event (renal injury, nervous system, skin pigmentation, etc) were collected from the two groups.Results:A total of 90 patients were enrolled, including 22 patients in the CRRT group and 68 patients in the non-CRRT group. ① There was no significant difference in gender, age, basic diseases, liver function, infection of pathogens and sites, colistin sulfate dose between the two groups. Compared with the non-CRRT group, the acute physiology and chronic health evaluation Ⅱ (APACHE Ⅱ) and sequential organ failure assessment (SOFA) were higher in the CRRT group [APACHE Ⅱ: 21.77±8.26 vs. 18.01±6.34, P < 0.05; SOFA: 8.5 (7.8, 11.0) vs. 6.0 (4.0, 9.0), P < 0.01], serum creatinine level was higher [μmol/L: 162.0 (119.5, 210.5) vs. 72.0 (52.0, 117.0), P < 0.01]. ② Plasma concentration: there was no significant difference in steady-state trough concentration between CRRT group and non-CRRT group (mg/L: 0.58±0.30 vs. 0.64±0.25, P = 0.328), nor was there significant difference in steady-state peak concentration (mg/L: 1.02±0.37 vs. 1.18±0.45, P = 0.133). ③ Clinical efficacy: there was no significant difference in clinical response rate between CRRT group and non-CRRT group [68.2% (15/22) vs. 80.9% (55/68), P = 0.213]. ④ Safety: acute kidney injury occurred in 2 patients (2.9%) in the non-CRRT group. No obvious neurological symptoms and skin pigmentation were found in the two groups. Conclusions:CRRT had little effect on the elimination of colistin sulfate. Routine blood concentration monitoring (TDM) is warranted in patients received with CRRT.

Objective: To investigate the difference of prognostic factors and recurrence rates between papillary thyroid microcarcinoma (PTMC) and lager papillary thyroid carcinoma (PTC) and analyze the clinical pathological characteristics of PTMC suitable for surgery. Methods: A retrospective analysis on the clinicopathological features, expression level of of v-raf murine sarcoma viral oncogene homolog B1 (BRAF) V600E gene mutation and pigment epithelium-derived factor (PEDF), and postoperative follow-up results of the 251 PTC patients who underwent surgical treatment from October 2011 to October 2013, including 169 cases with PTMC and 82 with lager PTC (Tumor diameter>1 cm). Results: The BRAF V600E mutation rates of PTMC and lager PTC patients are 65.1%(110/169)and 78.0% (64/82) respectively, and the difference is statistically significant (P<0.05). The prevalence of extrathyroidal invasion (7.1%) and lymph nodes metastasis (27.2%) of the patients with PTMC were significantly lower than those of the patients with larger PTC (15.9% and 46.3%, respectively)(P<0.01). The follow-up durations for PTMC and lager PTC were (45.6±3.6) months and (45.0±3.4) months, respectively (P>0.05). There was no statistic significance for the difference in age, gender, coexistent hashimoto′s thyroiditis, PEDF expression, and recurrence rate between the patients with PTMC and with larger PTC (P>0.05). The recurrence rate of the patients who have the high risk factors of PTMC was 1.6%(2/122)and that of larger PTC was 4.9% (4/82). Conclusions Extrathyroid invasion, lymph node metastases and BRAF V600E gene mutation are the high risk factors of recurrent PTMC. The same treatment strategy should be considered for PTMC with coexistent high risk factors as that for larger PTC. For PTMC with BRAF V600E gene mutation, earlier surgical treatment is suggested. PTMC patients with BRAF V600E gene mutation and high cell subtype are suggested to undergo total thyroidectomy for the first operation in order to reduce the potential risk of recurrence.