Publications by authors named "Iman Rahimi"

7 Publications

  • Page 1 of 1

A review on COVID-19 forecasting models.

Neural Comput Appl 2021 Feb 4:1-11. Epub 2021 Feb 4.

Data Science Institute, University of Technology Sydney, Ultimo, 2007 NSW Australia.

The novel coronavirus (COVID-19) has spread to more than 200 countries worldwide, leading to more than 36 million confirmed cases as of October 10, 2020. As such, several machine learning models that can forecast the outbreak globally have been released. This work presents a review and brief analysis of the most important machine learning forecasting models against COVID-19. The work presented in this study possesses two parts. In the first section, a detailed scientometric analysis presents an influential tool for bibliometric analyses, which were performed on COVID-19 data from the Scopus and Web of Science databases. For the above-mentioned analysis, keywords and subject areas are addressed, while the classification of machine learning forecasting models, criteria evaluation, and comparison of solution approaches are discussed in the second section of the work. The conclusion and discussion are provided as the final sections of this study.
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http://dx.doi.org/10.1007/s00521-020-05626-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7861008PMC
February 2021

Can presence of oral Fordyce's granules serve as a marker for hyperlipidemia?

Dent Res J (Isfahan) 2014 Sep;11(5):553-8

Department of Surgical Dentistry, School of Dentistry, Ajman University, Ajman, United Arab Emirates.

Background: Hyperlipidemia is a well-documented risk factor for coronary heart disease and a great wealth of clinical trials have shown that early detection of hyperlipidemia and prescribing drugs that lower elevated lipid levels reduce serious cardiovascular events, such as myocardial infarction, heart failure and stroke. Fordyce granules (FGs) are sebaceous glands without hair follicles, most often located under the epithelium of the cheek and the vermilion border of lip. The incidence of FGs is typically high and their presence is usually regarded as a normal variation of the oral mucosa. The aim of this study was to investigate the pattern of anatomical distribution and density of FGs and also to explore any potential relationship between the detection of FGs and the state of hyperlipidemia.

Materials And Methods: A cross-sectional, prospective study was designed. The participants were divided into two groups; first group consisted of individuals with FGs and the second group included those with no FGs detected. All participants were fasting 9-12 h before they were subjected to a comprehensive oral examination and their blood was sampled and tested for complete lipid profile. The presence of FGs was scored based on the number of the granules and their anatomical distribution. Chi-square test was used and P < 0.05 was considered as significant.

Results: A total of 350 patients were recruited for this study, nearly 90% (n = 314) elicit detectable FGs. The FGs were mainly located on the buccal mucosa with or without labial involvement and their density tend to reduce with age and also with smoking. Individuals with elevated lipid profile tend to have the highest score of the FGs.

Conclusion: According to this report, the presence of high numbers of FGs in people with high risk factors for cardiovascular disease should not be neglected.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4241607PMC
September 2014

Influence of tooth length on the accuracy of the Root ZX electronic apical foramen locator: an ex vivo study.

Acta Odontol Scand 2015 Feb 9;73(2):101-6. Epub 2014 Oct 9.

Torabinejad Dental Research Center, Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences , Isfahan , Iran.

Objective: Electronic apical foramen locators are now widely used to determine working length. This study was designed to determine whether tooth length influenced the accuracy of the Root ZX device.

Materials And Methods: Forty extracted maxillary canine teeth with a length range of 27-29 mm were selected. Access cavities were prepared and coronal flaring of canals performed. The teeth were mounted in self-polymerizing acrylic resin to facilitate horizontal sectioning except for the apical 3-4-mm portion of the root and embedded in alginate as the electronic medium. Electronic measurements were taken at the major foramen, 'zero' reading using the Root ZX and compared with the actual root canal length. The teeth were sectioned 3 mm from the coronal reference point to create a second group with shorter length; these reductions in the length continued six times in all to create seven groups of 40 specimens each. The actual and electronic lengths of specimens in each group were measured. Data were analyzed by Pearson's correlation coefficient.

Results: Identical measurements between the actual and electronic root canal length from the longest to the shortest groups were 12.5%, 10.0%, 20.0%, 27.5%, 37.5%, 35.0% and 45.0%, respectively. There was a mild negative correlation between the precise measurements of the Root ZX and root canal lengths in the seven groups (r = -0.964, p < 0.001).

Conclusion: Under the conditions of the study, the Root ZX device was more accurate in shorter teeth compared to longer ones.
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http://dx.doi.org/10.3109/00016357.2014.956144DOI Listing
February 2015

Attitudes of anesthesiology residents and faculty members towards pain management.

Middle East J Anaesthesiol 2012 Feb;21(4):521-8

Tehran University of Medical Sciences--Pain Management Center, Sina Hospital, Imam ave., Tehran, Iran.

Introduction: There is a large armamentarium of pain-reducing interventions and analgesic choices available to anesthesiologists, but oligoanalgesia continues to be a large problem. We studied the attitudes of residents and faculty members of anesthesiology towards different domains of pain medicine.

Methods: anonymous questionnaires were mailed to 68 professionals containing demographic and personal data plus 40 items in 10 domains: control, emotion, disability, solicitude, cure, opioids, harm, practice settings, training, and barriers. Internal consistency was 0.70 and the test-retest reliability was 0.80.

Results: With 81% response rate, we observed desirable beliefs towards all domains except moderately undesirable beliefs towards the domain solicitude. Scores of residents and faculties were not significantly different.

Conclusion: Continuing education programs on both the international guidelines, routine professional education, are needed to improve attitudes towards pain control.
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February 2012

Comparison of the effect of fentanyl, sufentanil, alfentanil and remifentanil on cardiovascular response to tracheal intubation in children.

Iran J Pediatr 2011 Jun;21(2):173-80

Department of Anesthesiology and Critical Care, Tehran University of Medical Sciences, Tehran, Iran ; Bahrami Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Objective: Laryngoscopy and tracheal intubation may cause significant cerebral and systemic hemodynamic responses. Many drugs have been shown to be effective in modifying these hemodynamic responses, including fentanyl, sufentanil, alfentanil and remifentanil. The purpose of the current study was to compare the efficacy of fentanyl, sufentanil, alfentanil and remifentanil on blunting cardiovascular changes during laryngoscopy and intubation in children.

Methods: Eighty children, 1-6 years old, classified as American Society of Anesthesiologists physical status I and II who were scheduled for elective surgery with general anesthesia and orotracheal intubation, were enrolled in this randomized and double-blinded study. Patients were randomly assigned into four groups of 20 patients. Group F received fentanyl 1µg/kg(-1), group S received sufentanil 0.1 µg/kg(-1), group A received alfentanil 10 µg/kg(-1) and group R received remifentanil 1 µg/kg(-1) intravenously. After establishment of neuromuscular blockade confirmed with a nerve stimulator, laryngoscopy and orotracheal intubation were performed 3 min after induction. Hemodynamic variables including systolic and diastolic blood pressure (SAP, DAP) and heart rate (HR) were recorded at base line (before opioid administration), before laryngoscopy and one minute after orotracheal intubation.

Findings: The patients' characteristics and laryngoscopy grade were similar in all groups. There was no significant difference in the mean values of SAP, DAP and HR at each measured time between the four groups. There was significant difference in the mean values of SAP, DAP and HR measured over time in each group.

Conclusion: The intravenous fentanyl attenuated laryngoscopy-induced SAP, DAP and HR increases better than sufentanil, alfentanil or remifentanil and hemodynamic stability is better preserved with fentanyl.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3446168PMC
June 2011

Effects of ephedrine on intubating conditions following priming with atracurium: a randomized clinical trial.

Acta Anaesthesiol Taiwan 2009 Mar;47(1):28-31

Department of Anesthesiology & Critical Care, Amir-Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Background: Priming is a well-known method to accelerate the onset of action of nondepolarizing neuromuscular-blocking agents. It consists of administration of a small dose of neuromuscular blocking agent several minutes before the principal dose is given. Ephedrine has been shown to improve the intubating conditions of rocuronium following its priming with a small dose. However, the potential effects of ephedrine on intubating conditions using atracurium after its priming with a small dose have not yet been studied. Since rocuronium is not available in Iran, atracurium is widely used as an alternative.

Methods: We studied two groups of patients, each group consisting of 32 patients. One group received ephedrine after priming (PE) and the other received placebo following priming (P). There were no significant differences between the two groups in age, sex, physical status (assessed using the American Society of Anesthesiologists classification), baseline mean arterial pressure and baseline heart rate. Patients with anticipated difficult airway, hypertension, obesity, any evidence of neuromuscular, cardiovascular, respiratory, hepatic, or renal disease, as well as those taking medications known to interact with atracurium or ephedrine were excluded. The anesthesiologist, the physician responsible for recording the results, and the statistician interpreting them were blinded to group allocations. Intubating conditions were graded according to Cooper's criteria. A clinically acceptable outcome was defined as good or excellent intubating conditions, represented by overall scores of 6-7 and 8-9, respectively.

Results: Intubating conditions were clinically acceptable in 22 patients in the PE group and 15 patients in the P group (p = 0.13). Vocal cord position and jaw relaxation scores during intubation and response to intubation did not differ significantly between the two groups. The mean arterial pressure showed significant differences over the course of time between the two groups (p < 0.01). Heart rate exceeded 120 bpm more frequently in the PE than in the P group (p < 0.01).

Conclusion: The effects of ephedrine on improving intubating conditions following atracurium priming were not statistically significant. Given the risk of exacerbation of coronary ischemia by tachycardia, and the negative results on intubating conditions in our study, we cannot recommend the use of ephedrine for improving intubating conditions following priming with atracurium.
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http://dx.doi.org/10.1016/S1875-4597(09)60017-5DOI Listing
March 2009

Household cardiovascular screening of high-risk families: a school-based study.

Eur J Cardiovasc Prev Rehabil 2006 Apr;13(2):229-35

Endocrinology and Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran.

Background: A parental history of cardiovascular disease has a strong relationship with risk factor clusters in the offspring. This study was performed to identify major cardiovascular risk factors in middle school-aged children and their parents in both high and low-risk families.

Design: A school-based, cross-sectional study.

Methods: The middle schools of the 6th district of Tehran were divided randomly into two groups. A total of 169 high-risk children with their families were recruited from the first group and 105 low-risk children with their families were recruited from the second group of schools. Anthropometric and metabolic measurements were performed.

Results: The means of the waist circumference and waist-to-hip ratio were significantly higher in high-risk fathers. The means of total and low-density lipoprotein (LDL) cholesterol were significantly higher in both parents and children of the high-risk group. The means of the fasting plasma glucose were significantly higher in fathers and offspring of high-risk families. More fathers in high-risk families were smokers. The prevalence of increased total cholesterol, LDL-cholesterol and hyperglycemia (> or = 100 mg/dl) were higher in high-risk parents and children. The prevalence of increased body mass index (> or = 25 kg/m for parents and 85th percentile for children) was higher in fathers and children of high-risk families.

Conclusions: Cardiovascular risk factors are more prevalent and clustered in high-risk families. The screening of high-risk families is essential to prevent the progression of atherosclerosis from childhood and reduce the burden of cardiovascular disease in adulthood.
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http://dx.doi.org/10.1097/01.hjr.0000214605.53372.62DOI Listing
April 2006