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Introduction: Due to the absence of frozen section in the majority of hospitals, malignant breast masses are being operated in two admissions first for biopsy and second for mastectomy. With simple and rapid technique of touch imprint (intraoperative cytology) both operations can be done in the same time. In this study the diagnostic accuracy of intraoperative cytology (touch imprint) in malignancy of breast masses is evaluated. Materials and Methods: During 2003 to 2006, reports of touch imprints of 70 patients with breast masses were compared to reports of their permanent section. Based on gathered data, positive and negative predictive value, sensitivity and specificity, and positive and negative likelihood ratio of the test were determined. Results: In 70 patients, 39 cases had malignant and 31 cases had benign masses. In 39 patients with malignant masses, 36 patients had malignant and 3 patients had benign cytologic reports. In 31 patients with benign masses 2 patients had malignant reports in cytology. Therefore sensitivity, specificity and accuracy of touch imprint in diagnosis of malignant breast masses were 92.3%, 93.5% and 92.9% respectively. Conclusion: Because of high specificity of touch imprint, it seems that this test can be done in centers that do not have frozen section for intraoperative diagnosis of malignant breast masses.

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Introduction: Sodium arsenite is an environmental pollutant which its amounts in industrial cities are more than other places because of its use in chemical industry. Human populations are exposed to this chemical compound through food, soil, air and water which has toxic and histopathological effects on different body organs including kidney. The aim of this investigation is to study the quantitative histopathological effects of sodium arsenite on the kidney structure of rats. Materials and Methods: 12 male Wistar rats with mean body weight of 200±20 g were randomly divided into 2 groups (n=6). One treated with sodium arsenite (8 mg/kg/day in drinking water) and the other one (the control group) received drinking water only. 2 months after treatment the rats were weighed, anesthetized with ether and dissected. The left kidney was taken out, cleaned, weighed and then fixed in 10% formaldehyde solution. After obtaining 1mm thick slices, tissue processing was carried out, then 5µm thick sections were prepared and stained using H&E method. Slides were finally studied stereologically and data was statistically analyzed using paired sampled t-test and the means were considered significantly different at p<0.05. Results: The results of this investigation indicated significant reduction in the total mean volume of kidney (p<0.001), cortex (p<0.001), and medulla (p<0.003) in sodium arsenite treated group compared to the control rats. The mean volume of tubules and interstitial tissue as components of cortex reduced significantly compared to the control group (p<0.003).The mean volume of glomeruli and Bowman's capsule was significantly reduced in treated group (p<0.001), while the other components did not show a significant reduction in volume. A significant reduction was also found in the kidney (p<0.002) and the body weight (p<0. 01) in the treated group compared to the control ones at the end of the experiment. Conclusion: It was concluded that exposure to sodium arsenite leads to histopathological changes in kidney structure, however more studies are needed to determine the effects of these structural changes on the kidney function.

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Introduction: In resent years, neuronal type Na+ channel is one of the important currents for action potential depolarization phase in heart cells. In this study neuronal type Na+ channel is blocked by low concentration of Tetrodotoxin (TTX) to compare the effect of TTX blocker on pacemaker activity of sinoatrial node (SAN) and atrioventricular node (AVN) of mouse heart. Materials and Methods: In this experimental study the pacemaker activity of distinct intact SAN and AVN, was recorded before and during consuming 100 nM TTX, and cycle length (CL) was measured. Data was analyzed using t-test. Results: 100 nM TTX increased CL on SAN preparations by 22.2±6% and on AVN preparations by 52.5±13.5 %. These changes were significant in the two nodes. Conclusion: It is passible to conclude that the neuronal type Na+ channel was present in the two nodes, and the effect of TTX on CL of the two nodes was different.

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Introduction: Many research demonstrate the effect of margarine trans fatty acids on many physiological mechanisms in both human and animals. The purpose of this research was to evaluate the effects of margarine oil on reproduction in Wistar rat. Materials and Methods: ‏This is an experimental study in which 46 Wistar female and male rats were divided into 4 groups. Male and female rats in group 1 were fed by 3% Margarine oil and standard food, in group 2 only female rats and in group 3 only male rats had Margarine oil with the standard food. Male and female rats in group 4 (as control group) had only standard food. Administration was started one month pre mating and continued during mating, gestation and lactation periods. After delivery, the pups were assessed for overall number, sex ratio, body weight, and mortality. One way analysis of variance was used for data avalysis. Results: ‏Results showed that weight and female ratio of pups were significantly increased in group 2 as compared to group 1 and control. Also the comparison of pups’ mortality in the four groups showed that pups mortality was increased in group 2 as compared to the other groups. On the other hand there was no significant difference in number of pups in the four groups. Conclusion: The results showed that dietary Margarine oil administration to female rats can significantly increase weight, ratio of female pups and mortality of pups.

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Introduction: Despite different methods implemented, surgical wound infection is still an important cause of mortality and morbidity of patients which impose a considerable cost on health care system. According to recent data, administration of supplemental oxygen during operation can reduce the risk of wound infection due to increased tissue oxygenation and therefore better elimination of bacteria by oxidative killing. This study is done to investigate the effect of administered oxygen ratio on the incidence of wound infection in clean-contaminated surgery. Materials and Methods: This is a double blind clinical trial. 584 patients from both sexes between 18 to 60 years old, who were condidated for clean-contaminated surgery were divided into two equal groups randomly. One recived 80% and the other 40% FIO2 during anesthesia. The frequency of wound infection between the two groups was assessed during a two weeks period. Results: Of patients receiving 80% FIO2, 11 (3.9%) patients, and the group recieving 40% FIO2, 25(8.1%) patients had wound infection (p<0.05). Conclusion: This study similar to previous studies showed the positive effect of supplemental oxygen in decreasing risk of surgical wound infection. Therefore according to the low risk and low cost and effectivness of this method in patients undergone surgery, it is recommended in clean-contaminated surgery.

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Introduction: Labor refers to the chain of physiologic events that allows a fetus to undertake its journey from the uterus to the outside world. Friedman (1954) describes a sigmoid pattern for labor. This study is carried out to identify the trend of labor progression in multiparous women. Materials and Methods: The present cohort study was conducted on 336 multiparous women. In order to assess labor stages, dilatation per unit of time was evaluated in each participant. Participants were divided into four groups: non intervention, induced, sedated, and both intervention groups. The related parameters were evaluated in all groups. Data was analyzed using one way analysis of variance, one sample t-test and mixed model regression models in reverse method for drawing the curve. Results: In all groups, with the increasing expansion of cervix the rate of cervix dilatation was increased. A significant relationship was observed between expansion speed rate in active phase of the first stage and the third stage, with induction of labor (p<0.05). But there was no relationship between the second stage and induction. The mean time of active phase and the second stage in this study was significantly higher than women of Freidman study (3.56 hours in contrast to 2.2 hours and 25 minute in contrast to 18 minute, respectively)(p<0.001). Also in the present study the deceleration phase was not seen. Conclusion: Now the pattern of labor progression differs from Freidman's curve in 1950 and has not the sigmoid shape, and the most important factor affecting latent phase is the dilatation of cervix at the time of admission. So determining a standard curve, without bias, is very difficult, and statistical methods should be used to decrease the effect of confounding factors of participants.

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Introduction: In this study the effect of extracellular trans zinc and voltage sensitive calcium channels on different aspects of learning and memory has been investigated. Materials and Methods: This is an experimental study in which the effect of a calcium channel antagonist (Verapamil) and zinc chelator (Ca-EDTA), on passive avoidance learning (shuttle box apparatus) has been examined by intraperitoneal administration of defferent doses of these drugs. Data was analyzed using one way analysis of variance. Results: Result of intraperitoneal injection of 100 milimolar Ca-EDTA indicated that it has no effect on the acquisition, consolidation, and retrieval of passive avoidance learning. Verapamil (100 and 150 micrograms) as a L-type voltage gated calcium channel antagonist, decreased acquisition and consolidation but not retrieval of passive avoidance behaviour. These effects were dose dependent. The simltaneous effect of Ca-EDTA and verapamil was also studied. Ca-EDTA (100milimolar) and verapamil (100 micrograms) have negative effects on consolidation of passive avoidance learning. Conclusion: Probably, common mechanisms are involved in acquisition and consolidation of passive avoidance learning, and zinc and calium ions play interactive roles in this aspect.

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Introduction: Cataract is a type of tarnish observable opacity in different layers constituting the lens and will cause light occlusion or scattering. Necessity for treatment of Cataract via surgery and its close relation with corneal astigmatism, when we applied a new method in cutting and type of cataract surgery, led us to measure the post-operation corneal astigmatism changes in frown incision Phacosection. Materials and Methods: This interventional study has been done on 73 eyes(58 patients). These patients were gone under Cataract surgery via no stitch frown incision scleral tunnel phacosection method. In this study we have 7mm external scleral incision with no suture. They were Keratometerized in four separate periods including pre-operation, one week, one month and three months post- operation. Data was analyzed using independent and paired t-tests. Results: Age, sex and left or right eye had no influence on astigmatism. Mean pre- operation astigmatism was 0.84 ± 0.87D, mean astigmatism 1 week post- operation was 0.27 ± 0.88 D, 1 month post- operation 0.06 ± 0.82 D, and three months post-operation was -0.03 ± 0.85 D (P= 0.0001). Before operation, 80% of the patients did have an astigmatism rate less than 1D that increased to 94.5% in three months period after operation and in 89% of the cases, the ultimate change in astigmatism has been found lower than 1D. The obtained information revealed that there is a meaningful difference between pre-operation astigmatism and the same after one week, one month and three months post-operation(P= 0.0001). Independent sample t and paired t-test were used to analyse data. Conclusion: Our study indicated that the no stitch frown incision scleral tunnel phacosection surgery can reduce pre-op corneal astigmatism, and because of induction of the slight controlled astigmatism we can apply this technique for all cataractic patients

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Introduction: Delivery of immediate medical interventions appropriate to the severity of clinical status of patients is a main public expectation of emergency departments. Waiting time and length of stay are the key measures to asses the quality of care in emergency departments. This study is done to investigate the waiting time and length of stay of attendants to emergency department of Vali-e-Asr Hospital, Arak-Iran. Materials and Methods: This analytical cross-sectional research was conducted in a general emergency department of a teaching hospital in Arak to asses the waiting time and length of stay of patients. In the first stage of the study all attendants during a 6 weeks period were classified regarding to the severity of their clinical status by an educated nurse and a general practitioner using a three category scale (guideline) presented by ministry of Health and Medical Education (2001). Also waiting time for a general practitioner visit was measured and documented by the resident general practitioner. In the second stage, a sample of 100 documents of patients in group 1 and 2 admitted for specialist visit were assessed for the waiting time and length of stay in emergency department. Mean of waiting time according to patients clinical status and the specialty of the first physician were analyzed by t-test and ANOVA (p =0.05). Results: During a 6 weeks period, of 1963 patients, 179(9.1%) were categorized as emergent (category 1), 391(19.9%) urgent (category 2) and 1393 (71%) non urgent. The mean waiting time for general practitioner visit was 5 minutes. The median and mean of waiting time for specialist visit in group 1 and 2 of patients were 225 and 262±156, 220 and 227±153 minutes, respectively. The median and mean of length of stay was 1 and 2 days, respectively. No differences were found between waiting time of various specialties visit in patients of categories 1 and 2. Conclusion: Regarding the long waiting time for specialist visit, using triage in emergency departments is necessary. This needs planning and organization for the presence of specialists in the hospital, over the time. Also regarding the large number of nonurgent patients, 24 hours presence of a general practitioner is necessary.

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Introduction: Based on statistical and epidemiological studies, cancer is the third most common cause of death after heart diseases and accidents, therefore planning to control cancer is essential for public health. Cancer registration is an important part of cancer control, and the collected data could be useful in etiological studies, and health programming to prevent and treat the disease. In this study cancer incidence and cancer registration in Markazi province investigated. Materials and Methods: In this descriptive study, data related to cancer were collected from the health center of Markazi province, from 2001 to 2006. Then the prevalence and incidence of different kind of cancer were determined. Results: Results showed that the top ten cancers among women were: 1-Breast 2-Skin 3-Stomach 4-Colorectal 5-Lung 6-Uterus 7-Bladder 8-Lymphoma 9-Thyroid 10-Esophagus, and the ten most prevalent cancers among men were: 1-Skin 2-Bladder 3-Stomach 4-Lung 5-Prostate 6-Colon and Colorectal 7-Esophagus 8-Lymphoma 9-Testese 10-Gall bladder. Conclusion: In this investigation we also compared cancer incidence and distribution in Markazi province with national rates and our results showed that in some years, cancer statistics is different from national statistics which it may be due to different environmental and epidemiological factors.

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Introduction: Methicillin resistant staphylococcus aureus strains are the most important agents of nosocomial infections. The conventional antibiotic susceptibility methods such as disk diffusion are not suitable for detection of these strains due to their heteroresistancy. Therefore, in this study, agar screen and duplex-PCR were compared in determination of methicillin resistant Staphylococcus aureus (MRSA) strains isolated from nose of personnel in Hajar hospital of Shahre-kord, 2007. Materials and Methods: In this experimental study a total of 204 nasal swabs from personnel of Hajar hospital over a period of 6 months were collected. The specimens were cultured on mannitol salt agar for primary isolation and identification of Staphylococcus aureus strains and their susceptibility pattern to oxacillin was assessed using agar screen method. Finally, using duplex PCR, the isolates were tested for the presence of mecA gene. Results were compared and sensitivity and specificity of the method was determined. Results: In this study, 23 of the 52 (44%) Staphylococcus aureus isolates were resistant to oxacillin using agar screen method. However, mecA gene was detected in 27 of the 52 strains (52%). Our results showed that the sensitivity and specificity of agar screen method in determination of MRSA strains were 81.5% and 96%, respectively comparing with PCR. Conclusion: Oxacillin agar screen, comparing PCR, is an inexpensive, applied and phenotypical method with low false positive and suitable for screening of MRSA. However, due to its relatively high false negative results is not appropriate for screening of MRSA strains isolated from hospital-employed nasal carriers.

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Background: In molecular diagnosis of microbial agent, purification of chromosome is very important step. In this study, after cell destruction, DNA replication was done by increasing the denaturation time, without DNA purification. Methods and Materials: In this experimental study eight different dilution of E.coli (8/100, 4/100, 2/100, 1/100, 1/200, 1/400, 1/800 and 1/1600) solution were madce in D.W, Bacteria were separated by filtration. Polymerase chain reaction method was used to propagate 162 rRNA gene by design primers without DNA Purification. In order to confirme sensitivity of PCR, contamination of 15 different sources of Arak well water wafer was compared by MPN method. For confirmed sensitivity of PCR, 15 sources of water in Arak were examined and compared with MPN method. Results: Present of bacteria in diution sou tion were confirmed by culture. Polymerale Chain reaction (PCR) data were shown this method is able to recognize bacteria in above dilutions after filtration. This study showed high sensitivity of PCR method in compare to MPN method. Conclusion: Results were shown without stages of extraction of DNA, PCR were done without losing chromosome. Therefore false negative results were decrease and avoided from difficult phases.

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Background: Metronidazole has antibacterial and antiparasitic action. Therefore it can use for treatment inflammatory diseases as Crohn. The effect of metronidazole on human’s blood lipids to reducing levels of LDL and VLDL and increasing level of HDL is under investigation. Target of this research is consideration effect of metronidazole on hyperlipidemia case of death such as coronary artry disrase. Methods and Materials: This study is a triple blind clinical trial was done on 100 voluntaries between 25-65 years old. with hyperlipidemia. Samples divided in two equal groups. The first group received metronidazol, 500mg, BID, for 10 days, and control group received placebo with the same dose. Lipids of serum were measured before and after using drugs, then data analyzed by SPSS software. Results: In metronidazol group amount of total cholesterol, LDL and Triglyceride were significantly less than placebo group. HDL’s amount in metronidazole group was significantly more than placebo group. Conclusion: Significant effect of metronidazole on reducing harmful blood lipids and increasing useful blood lipids. It can be suggested a probable candidate in treatment of hyperlipidemia. Maybe it can use with this application. Although it needs to more study by meta analysis to validate this effect.

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Background: One of the best examples of epimorphic regeneration in the mammals is the formation of new tissues formed from blastema in holes punched in the ears of rabbits. The aim of this research is to investigate speed and percentage of regeneration in different geometrical shaped holes and different regions of rabbit's ear. Methods and Materials: In this experimental research different region of rabbit's ear (proximal, medial and distal) were punched as different geometrical shaped holes (circlc, quadrangle and triangle) with the same area (50 mm2) Ubyg a puncher which designed for this purpose. The regeneration of wounds was evaluated and the percentage of regeneration was calculated. After punching, each 3 days (36-40 days). Results: Results showed speed and percentage of regeneration in circular holes was significantly (P<0.05) more than quadrangular and triangular holes. In addition, regeneration speed of holes located in proximal regions of ear, was more than peripheral holes. Conclusion: Wound regeneration in rabbit's ear is related to the geometrical shape of holes. Speed and the percentage of regeneration in circular shapes is more than angular shapes.

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Background: Pain is an unpleasant feeling which humans experience. It is a warning sign of the damaged tissue. Due to the awful sense of pain, scientists always attempt to relieve it. Retinoic acid (RT), an active metabolite of natural vitamin A has important roles in modulation of the inflammatory responses. The aim of the present study was to analyze the pain threshold of rats which had microinjections of RT, applying acute and chronic models. Methods and Materials: In this study, the tail flick and formalin tests were used to determine pain threshold. In each test, the acute and chronic pain thresholds of 252 Wistar male rats (275 ± 25 gr) were assayed. The druge were injected in the acute model one-dose30 minutes before behavioral testing and in chronic model two-dose for one or two-weeks. The rats of both models divided randomly into six groups (n=7). In four treatment groups retinoic acid (RT) intra cerebro ventricular (i.C.V) were injected as dosagc of 0.5, 3 and 6 (µg/kg) micrograms per kilogram. In control group, was microinjected by ACSF. In vehicle group injected RT solvent (DMSO+ Distil water). Results: The resuits Showed acute injection of RT did not change pain thresholds in the tail-flick methd, but the chronic administration of RT (0.5, 1, 3, 6 µg/kg) reduced tail-flick latencies of the rats (p<0.05) in compare to DMSO group. The threshold of pain in the first phase of formalin test was reduced after injection of 3µg/kg of RT for two weeks. Conclusion: It was concluded that chronic i.c.v. injections of RT can induce significant hyperalgesia in rat.

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Background: Epileptic seizures are manifestation of epilepsy. Understanding of the mechanisms causing epileptic disorder needs careful analyses of the electroencephalograph (EEG) records. The detection of epileptic form discharges (spike wave) in the EEG is an important component in the diagnosis of epilepsy. Approximately one in every 100 persons will experience a seizure at some time in their life. Already intelligence spike detection method discucsed but purpose of this research is diagnosis of different kind of epilepsy (grandmal and Petitmal) by design of an intelligence diagnosis processing. Methods and Materials: In this descriptive study, 100 EEG signals of brain hemispheres from different person in healthy, interictal and ictal conditions were used. Fifty Hz noise and artifact signals were removed by soft ware procedure then signals separated by expert neurologist to three categories, healthy (frequency band 8-12 Hz), petitmal seizures (typical 3 Hz), grandmal seizures (clonic stage with 4 Hz frequency) and divided each of them to 6 seconds segments. Information of this signals (background alpha, spike and slow, poly spike and poly sharp) were extracted by wavelet transform and classified by soft ware procedure neural network to there groups healthy, ptitmal and grandmal epilepsy. Results: In designed software accuracy of diagnosis ptitmal and grandmal epilepsies was obtained about 80% Conclusion: This method introduced intelligent diagnosis of epilepsy (ptitmal and gradmal) and automatically detected healthy person from epileptic patients. One of the other advantages is help to neurologist for detection of sickness clearly and expendable different kinds of other epilepsy

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Background: According to the report of Iranian Center of Disease Control, in the summer of 2005 an outbreak of cholera (Inaba serotype) occurred in Iran. The outbreak lasted the mid of September. The aim of this study was to use the result of different studies performed during this period to determine source of infection. Methods and Materials: This is a meta-analysis study, which studies performed in Qum, Arak, Karaj, Golestan and Ghazvin were eligible. All of these studies were case control ones performed during the August 2005. The total of cases were 531. Pooled odds ratios was used to estimate by fixed and random method. All computations were performed by Stata 8 software. Results: The estimated pooled odds ratios resulted from 5 differemt studies were used in the meta-analysis as the following: travelling (1.64 95% CI: 0.98-1.88), non-pasteurized ice cream (0.88 95%CI: 0.48-1.61), post toilet hand washing (3.72 95% CI: 0.86-16.05), eating meal outside home (2.38 95% CI: 1.46-3.90), raw fruit eating (0.98 95% CI: 0.42-2.18) and raw vegetables use (5.36 95%CI: 2.4-12). Conclusion: According to the results of this study raw vegetable use and having meal outside home were significantly associated to the cholera in mentioned provinc

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Background: Radiotherapy is one of the cancer treatment methods. Prescribed dose for each fraction is considered based on radiosensitivity of tumoral and normal tissues. Viral agents are the effiectiv factors on tissue sensitivity. This research aimed to determine the effect of ionizing radiation of Cobal 60 on radiosensitivity of Hela cells infected with Measles virus. Methods and Materials: In this study, the radiosensitivity of Hela cells is investigated experimentally and qualitively. The cells have been cultivated in two groups (experimental and blank) and plating efficiency has been obtained. Then 100λ measles virus with serial dilution method was used to induce infection in different ratio for experimental group. After cell growth and passage, the two groups were irradiated with 2Gy gamma radiation of cobalt 60. Results: Results respectively indicated cell death increases up to 5-7%, 15-20% and 50-65%, after 2Gy irradiation by Co 60 for contaminating to Measles in low, moderate and high concentrations. Conclusion: Radiosensitivity of tumoral cells increases when they are infected by viral agent. The result in radiotherapy of cancers showed, in prescribing dose fraction non cancer disease should be considered.

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  Background: Although the roles of steroid hormones in the activation and maintenance of reproductive function are proved well, emerging evidence indicated that these steroids influence on performance of learning and memory. These effects are complex and vary with task, gender, and age, as well as the regimens of steroid exposure. This study was carried out in order to assess the role of progesterone administration in newborns rats on Morris water maze learning ability after adolescence.

  Methods and Materials : This experimental study was carried out on 36 newborns Wistar rats. Rats were divided randomly into 6 groups female progesterone, male progesterone, female sesamoide, male sesamoid rats and male and female control rats. Progesterone groups were treated with a single injection of progesterone (100 mg/kg) and sesamoid groups were received the same volume of sesamoid oil as the progesterone vehicle in day 1 or 2 after brith, 60 days later, spatial memory ability was determined in Morris water maze.

  Results : The results of this study show that water maze learning can enhance by administration of sesamoid oil in newborn female pups in compared to progesterone and control groups (p<0.05). In addition, adding progesterone to sesame oil reduce water maze learning to control level.

  Conclusion: The hypothesis that progesterone impaired spatial reference memory in female rats was supported by this experiment.

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Background: Medical equipment improvement and tremendous expenditure is allocated costs annually, so that optimum and proper maintenance management of equipment would have outstanding effects on health and treatment of medical training and research economies of the country. Present research was implemented aiming to examine effect of the medical equipment maintenance management systems on the hospital setting expenditures. Methods and Materials: In an interventional research, the model of medical equipment maintenance management system implemented in Imam Khomeini Hospital was examined precisely and based on appropriate software for Vali-e-Asr Hospital was designed. According to the model for all available medical instruments in Vali-e-Asr hospital with usage of more than 5 years (240 medical equipment) all costs were recorded in 2006 and compared with previous year (2005). Results: There wasn't any training for medical equipment operators and for its implementation necessity on 21.7% of equipment in the installation and start up phase with for 83.7% of equipments the operator was not fixed using of medical equipment maintenance management system, the repair events decreased from 78 events in 2005 to 58 events in 2006. Vali-e-Asr hospital recorded costs for maintenance and repair of medical equipment in 2006 was 801765375 Rials(Iran)which decreased to 513212912 Rials (Iran) according to accurate calculation of costs and auditing by medical equipment engineer and shows 36% saving in expenditures by medical equipment maintenance management system. Conclusion: Medical equipment computer–based maintenance, management system implementation and also using of medical engineers potentialities in hospital are necessary.