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1.
Rev. urug. cardiol ; 38(1): e407, 2023. ilus
Article in Spanish | LILACS, BNUY, UY-BNMED | ID: biblio-1530365

ABSTRACT

El uso de la resonancia magnética (RM) en las distintas áreas de la medicina se ha expandido de manera significativa y de forma diaria se solicitan numerosos estudios. El hecho de que los resonadores pueden interaccionar con algunos objetos ha llevado a que históricamente se les niegue la realización de este estudio a pacientes portadores de dispositivos cardíacos porque se entiende que existen contraindicaciones absolutas. El avance de la tecnología de los dispositivos y la creciente evidencia publicada han cambiado este concepto. Nos proponemos revisar los mecanismos por los cuales un dispositivo implantable puede interactuar con el resonador y las implicancias clínicas que esto podría tener si las hubiera. La mayoría de los pacientes portadores de dispositivos cardíacos de estimulación podrán realizarse una RM, pero para que este procedimiento sea seguro es importante conocer las características y el tipo específico de dispositivo implantado. Proponemos finalmente puntos clave y algoritmos para tener en cuenta para el manejo adecuado de estos pacientes.


The use of magnetic resonance imaging (MRI) in different areas of medicine has expanded significantly and numerous procedures are indicated daily. The fact that resonators could interact with some objects has historically led to patients with cardiac devices being denied an MRI on the understanding that they suppose an absolute contraindication. Advances in device technology and the increasing evidence have changed this concept. We intend to review the mechanisms by which an implantable device could interact with the resonator and the clinical implications that this could have if any. Most patients will be able to undergo these studies, but to determine the safety of performing an MRI it is important to know the characteristics and specific type of implanted device. Finally, we provide key points and algorithms to take into account for these patients.


O uso da ressonância magnética em diferentes áreas da medicina tem se expandido significativamente e inúmeros exames são indicados diariamente. A possibilidade de que os ressonadores interajam com alguns objetos historicamente levou os pacientes com dispositivos cardíacos a terem a ressonância magnética negada por entender que existem contraindicações absolutas. Os avanços na tecnologia de dispositivos e o aumento das evidências publicadas mudaram esse conceito. Pretendemos revisar os mecanismos pelos quais um dispositivo implantável pode interagir com o ressonador e as implicações clínicas que isso pode ter, se houver. A grande maioria dos pacientes poderá se submeter a esses estudos, mas para determinar a segurança de realizar uma ressonância magnética é importante conhecer as características e o tipo específico de dispositivo implantado. Por fim, propomos pontos e algoritmos para a gestão dos pacientes.


Subject(s)
Humans , Pacemaker, Artificial , Magnetic Resonance Imaging/adverse effects , Magnetic Resonance Spectroscopy/adverse effects , Defibrillators, Implantable , Patient Care Management
2.
Journal of Clinical Otorhinolaryngology Head and Neck Surgery ; (12): 670-672, 2023.
Article in Chinese | WPRIM | ID: wpr-1011029

ABSTRACT

Delayed endolymphatic hydrops (DEH) is a rare disease that causes vertigo and is often misdiagnosed as other vertigo diseases. This article reports on a patient with vertigo who was easily misdiagnosed. The patient was a middle ear cholesteatoma complicated by labyrinthine fistula (LF); however, his vertigo was episodic vertigo, which could not be explained solely by LF causing labyrinthitis. The possibility of endolymphatic hydrops was suspected, which was confirmed by inner ear magnetic resonance gadolinium imaging. This is the first reported case of middle ear cholesteatoma complicated by LF and DEH. The patient underwent surgical resection of the cholesteatoma and three semicircular canal obstructions at the same time. During two years postoperative follow-up, the patient did not experience a recurrence of vertigo. When diagnosing vertigo diseases, a careful history of vertigo is of utmost importance.


Subject(s)
Humans , Endolymphatic Hydrops/diagnosis , Cholesteatoma, Middle Ear/complications , Vertigo/complications , Labyrinth Diseases/complications , Magnetic Resonance Imaging/adverse effects , Semicircular Canals
3.
China Journal of Orthopaedics and Traumatology ; (12): 965-969, 2023.
Article in Chinese | WPRIM | ID: wpr-1009169

ABSTRACT

OBJECTIVE@#To investigate the correlation between the medial meniscal indentation index (MDI) and medial tibiofemoral articular cartilage damage more than 3 degrees in patients aged 40 to 60 years old with suspected or complicated knee osteoarthritis at non-weight-bearing position, and to determine the predictive threshold.@*METHODS@#From June 2016 to June 2020, a total of 308 patients who underwent initial knee arthroscopic exploration for chronic knee pain were collected. The age ranged from 36 to 71 years old with an average of(56.40±1.82) years old, including 105 males and 203 females. And patients with extra-articular malformations (abnormal force lines), a history of trauma, inflammatory arthritis and other specific arthritis were excluded. Finally, 89 eligible cases were obtained, aged from 42 to 60 years old with an average of (59.50±0.71) years old, including 45 males and 44 females. The degree of cartilage damage in the medial compartment of the knee joint was recorded, which was divided into two groups(≥degree 3 and<degree 3) according to Outer-Bridge classification system. The possible risk factors were determined by univariate analysis in the age, gender, affected sides, body mass index (BMI), synovial thickening grade, meniscus injury and MDI of 2 groups. Then, the independent risk factors for cartilage injury of more than grade 3 were determined by further binary Logistic regression analysis. If MDI was taken as an independent risk factor, receiver operating characteristic (ROC) analysis was performed to confirm whether it had diagnostic value for cartilage damage of above degree 3 and calculate the critical value of MDI.@*RESULTS@#A total of 89 eligible patients were obtained. Univariate analysis showed age, BMI, MDI and meniscus injury may be the independent risk factors for cartilage damage of more than 3 degrees, further binary Logistic regression analysis confirmed that MDI[OR=1.66, 95%CI(1.64, 1.69), P=0.01]and BMI [OR=1.58, 95%CI(1.17, 2.15), P=0.03] were independent risk factors for cartilage injury of more than degree 3 in enrolled patients. ROC analysis showed that MDI had more diagnostic value than BMI, and the critical value was 0.355 with a sensitivity of 89.1% and a specificity of 88.2%.@*CONCLUSION@#In doubt or accompanied by 40 to 60 years old patients with knee osteoarthritis, the MDI measured by non-weight-bearing knee MRI has predictive value for cartilage injury of more than degree 3 in medial tibiofemoral joint, and the critical value for diagnosis of cartilage injury of more than degree 3 is 0.355.


Subject(s)
Male , Female , Humans , Adult , Middle Aged , Aged , Osteoarthritis, Knee/surgery , Cartilage, Articular/surgery , Knee Joint/surgery , Meniscus , Menisci, Tibial/surgery , Cartilage Diseases , Magnetic Resonance Imaging/adverse effects
4.
Journal of Peking University(Health Sciences) ; (6): 818-824, 2023.
Article in Chinese | WPRIM | ID: wpr-1010135

ABSTRACT

OBJECTIVE@#Constructing a predictive model for urinary incontinence after laparoscopic radical prostatectomy (LRP) based on prostatic gland related MRI parameters.@*METHODS@#In this study, 202 cases were included. All the patients were diagnosed with prostate cancer by prostate biopsy and underwent LRP surgery in Peking University Third Hospital. The preoperative MRI examination of all the patients was completed within 1 week before the prostate biopsy. Prostatic gland related parameters included prostate length, width, height, prostatic volume, intravesical prostatic protrusion length (IPPL), prostate apex shape, etc. From the first month after the operation, the recovery of urinary continence was followed up every month, and the recovery of urinary continence was based on the need not to use the urine pad all day long. Logistic multivariate regression analysis was used to analyze the influence of early postoperative recovery of urinary continence. Risk factors were used to draw the receiver operator characteristic (ROC) curves of each model to predict the recovery of postoperative urinary continence, and the difference of the area under the curve (AUC) was compared by DeLong test, and the clinical net benefit of the model was evaluated by decision curve analysis (DCA).@*RESULTS@#The average age of 202 patients was 69.0 (64.0, 75.5) years, the average prostate specific antigen (PSA) before puncture was 12.12 (7.36, 20.06) μg/L, and the Gleason score < 7 points and ≥ 7 points were 73 cases (36.2%) and 129 cases (63.9%) respectively, with 100 cases (49.5%) at T1/T2 clinical stage, and 102 cases (50.5%) at T3 stage. The prostatic volume measured by preoperative MRI was 35.4 (26.2, 51.1) mL, the ratio of the height to the width was 0.91 (0.77, 1.07), the membranous urethral length (MUL) was 15 (11, 16) mm, and the IPPL was 2 (0, 6) mm. The prostatic apex A-D subtypes were 67 cases (33.2%), 80 cases (39.6%), 24 cases (11.9%) and 31 cases (15.3%), respectively. The training set and validation set were 141 cases and 61 cases, respectively. The operations of all the patients were successfully completed, and the urinary continence rate was 59.4% (120/202) in the 3 months follow-up. The results of multivariate analysis of the training set showed that the MUL (P < 0.001), IPPL (P=0.017) and clinical stage (P=0.022) were independent risk factors for urinary incontinence in the early postoperative period (3 months). The nomogram and clinical decision curve were made according to the results of multivariate analysis. The AUC value of the training set was 0.885 (0.826, 0.944), and the AUC value of the validation set was 0.854 (0.757, 0.950). In the verification set, the Hosmer-Lemeshow goodness-of-fit test was performed on the model, and the Chi-square value was 5.426 (P=0.711).@*CONCLUSION@#Preoperative MUL, IPPL, and clinical stage are indepen-dent risk factors for incontinence after LRP. The nomogram developed based on the relevant parameters of MRI glands can effectively predict the recovery of early urinary continence after LRP. The results of this study require further large-scale clinical research to confirm.


Subject(s)
Male , Humans , Prostate/surgery , Prostatectomy/adverse effects , Prostatic Neoplasms/pathology , Urinary Incontinence/etiology , Laparoscopy/methods , Magnetic Resonance Imaging/adverse effects , Recovery of Function , Retrospective Studies
5.
J. health med. sci. (Print) ; 7(1): 59-66, ene.-mar. 2021. tab
Article in Spanish | LILACS | ID: biblio-1380594

ABSTRACT

The increasing attention that is given to the protection of health professionals and patients has stimulated researchers and organizations to create alternatives to improve safety practices in health services, including in the Magnetic Resonance Imaging (MRI) environment. However, this theme still needs to be further explored in the MRI field. This paper aims to review the current literature, explore the approach to the MRI Safety Supervisor, to describe the role of the MRI Safety Supervisor and how it could serve as an agent to enhance the safety of health professionals and patients in the MRI environment. To achieve this, a narrative literature review was carried out in the electronic databases: ScienceDirect, PubMed, Scielo and Google Scholar, using as inclusion criteria, articles published in Portuguese and English between the years 2008 to 2019. The articles were filtered according to relevant aspects, such as authorship, title, year of publication, objectives, methodology and main results. Lastly, it considered aspects related to adverse events, international and national regulations on security and safety management in the MRI sector. Nevertheless, in the search for actions that effectively mitigate risks on this modality, it was observed that studies on the MRI Safety Supervisor are scarce, which reinforce the need for further studies on this matter.


Subject(s)
Humans , Safety , Magnetic Resonance Imaging/adverse effects , Role , Safety Management/organization & administration , Patient Safety
7.
Rev. cuba. cir ; 52(3): 223-227, jul.-sep. 2013.
Article in Spanish | LILACS | ID: lil-696699

ABSTRACT

El quiste hidatídico suprarrenal primario es una patología muy infrecuente por su localización y se encuentra en este órgano en menos del 0,5 por ciento de los casos, incluso en países con presencia endémica del Echinococcus. La mayoría de los quistes hidatídicos suprarrenales son asintomáticos, siendo el diagnóstico un hallazgo incidental. Las pruebas serológicas para el diagnóstico pueden ser negativas en muchos casos y el tratamiento es en su mayoría quirúrgico, con múltiples vías de abordaje. Es una patología poco común; el diagnóstico, manejo, tratamiento y vías de abordaje no se encuentran aún muy establecidos. Con este artículo tratamos de realizar un acercamiento más certero en cuanto a estos aspectos(AU)


The primary adrenal hydatid cyst is a very rare disease for its location and it is found in less than 0.5 percent of the cases, even in countries with endemic presence of Echinococcus. Most adrenal hydatid cysts are asymptomatic, and the diagnosis is an incidental finding, the serological tests for the diagnosis are negative in many cases and the treatment is mostly surgical, with multiple surgical approaches. It is a rare pathology whose diagnosis, management, treatment and surgical approaches are not yet well established. This article was intended to address these aspects in a more accurate way(AU)


Subject(s)
Humans , Male , Middle Aged , Adrenal Glands/injuries , Echinococcosis, Hepatic/pathology , Echinococcosis/diagnostic imaging , Magnetic Resonance Imaging/adverse effects
8.
Journal of Korean Medical Science ; : 1362-1372, 2013.
Article in English | WPRIM | ID: wpr-44047

ABSTRACT

We investigated the safety and clinical applicability of 7.0 Tesla (T) brain magnetic resonance imaging (MRI) in patients with brain tumors. Twenty-four patients with intraaxial or extraaxial brain tumors were enrolled in this study. 7.0T MRIs of T2*-weighted axial and T1-weighted coronal or sagittal images were obtained and compared with 1.5T brain MRIs. The T2*-weighted images from 7.0T brain MRI revealed detailed microvasculature and the internal contents of supratentorial brain tumors better than that of 1.5T brain MRI. For brain tumors located in parasellar areas or areas adjacent to major cerebral vessels, flow-related artifacts were exaggerated in the 7.0T brain MRIs. For brain tumors adjacent to the skull base, susceptibility artifacts in the interfacing areas of the paranasal sinus and skull base hampered the aquisition of detailed images and information on brain tumors in the 7.0T brain MRIs. This study shows that 7.0T brain MRI can provide detailed information on the intratumoral components and margins in supratentorial brain tumors. Further studies are needed to develop refined MRI protocols for better images of brain tumors located in the skull base, parasellar, and adjacent major cerebrovascular structures.


Subject(s)
Adult , Female , Humans , Male , Middle Aged , Brain Neoplasms/diagnostic imaging , Dizziness/etiology , Headache/etiology , Magnetic Resonance Imaging/adverse effects , Muscle Contraction/radiation effects
9.
Korean Journal of Radiology ; : 416-422, 2013.
Article in English | WPRIM | ID: wpr-218259

ABSTRACT

OBJECTIVE: An ex vivo study found a copper-containing intrauterine device (IUD) to be safe for women undergoing an MRI examination at a 3.0-T field. No significant artifacts caused by the metallic implant were detected. However, there are still no in vivo data about these concerns. The aim of this study was to evaluate 3.0-T magnetic field interactions of copper-containing IUDs in vivo. MATERIALS AND METHODS: Magnetic field interactions and potential adverse events were evaluated in 33 women using a questionnaire-based telephone survey. Two experienced radiologists performed artifact evaluation on MR images of the pelvis. RESULTS: Eighteen patients were eligible for the survey. One patient reported a dislocation of the IUD after the MR examination. All other patients had no signs of field interactions. No IUD-related artifacts were found. CONCLUSION: MRI at 3.0-T is possible for women with copper-containing IUDs. However, consulting a gynecologist to check the correct position of the IUD and exclude complications after an MR examination is highly recommended. High-quality clinical imaging of the female pelvis can be performed without a loss in image quality.


Subject(s)
Adult , Female , Humans , Middle Aged , Artifacts , Copper , Hot Temperature , Intrauterine Devices, Copper/adverse effects , Magnetic Fields , Magnetic Resonance Imaging/adverse effects , Pelvis
10.
Sudan Medical Monitor. 2011; 6 (3): 191-199
in English | IMEMR | ID: emr-118302

ABSTRACT

The study was carried out to investigate the bio-effects of repeated exposure to high intensity electromagnetic fields [EMFs] used in the medical field. An in vivo study was done by using repeated exposure of Swiss Albino Rats to MRI machine [1.5 Tesla, 64.85MHZ]. The rats were exposed to combination of both magnetic fields and radio frequency electromagnetic fields, daily for 30 minutes, 1 hour, three times per week for 2 weeks. The exposure was under the protocol of lumber spine scanning. A histological study was conducted on some of the rats' vital organs and rats' body weight to detect any cellular effects. A significant reduction in the rats body weights gain was detected. The histological findings were severe hemorrhage, necrosis in cardiac muscles, kidney, liver, dilatation of blood vessels in bone marrow, bone cartilage atrophy. No histological changes were detected in all the organs of the control group, in addition there is no reduction in their body weight. The above results showed that there is a big doubt about the safety of MRI techniques as far as the results and the literature review indicates severe effects on some vital organs. Therefore the safety considerations as repeated exposure to the MRI techniques must be reviewed and needs to be clearer


Subject(s)
Animals , Magnetic Resonance Imaging/adverse effects , Rats , Radiologic Health
11.
Iranian Journal of Dermatology. 2009; 12 (3 Supp.): 19-22
in English | IMEMR | ID: emr-109749

ABSTRACT

Nephrogenic systemic fibrosis [NSF], previously known as nephrogenic fibrosing dermopathy, is an emerging systemic fibrosing disorder that develops in the setting of renal insufficiency. Nephrogenic fibrosing dermopathy [NFD] is a fibrosing condition of the skin which shows an increased number of dendritic cells, fibroblasts and thickened collagen fibers resembling scleromyxedema. It is characterized by indurated plaques mainly on the extremities and the absence of paraproteinemia. Although the exact causes of NSF have not been established, evidence suggests an association between gadoliniumbased contrast agents and development of nephrogenic systemic fibrosis. We report a patient who was under dialysis and developed NSF but she never did MRI


Subject(s)
Humans , Middle Aged , Female , Nephrogenic Fibrosing Dermopathy/pathology , Gadolinium/adverse effects , Magnetic Resonance Imaging/adverse effects
13.
Indian J Pediatr ; 2008 Sep; 75(9): 953-5
Article in English | IMSEAR | ID: sea-82199

ABSTRACT

The posterior/potentially reversible encephalopathy syndrome is a unique syndrome encountered commonly in hypertensive encephalopathy. A 13-year-old boy presented with of intermittent high grade fever, throbbing headache and non-projective vomiting for 5 days. The patient had a blood pressure of 120/80 mmHg but fundoscopy documented grade 3 hypertensive retinopathy. The patient improved symptomatically following conservative management. However, on the 5(th) post-admission day headache reappeared, and blood pressure measured at that time was 240/120 mmHg. Neuroimaging suggested white matter abnormalities. Search for the etiology of secondary hypertension led to the diagnosis of pheochromocytoma. Repeated MRI after successful surgical excision of the tumor patient showed reversal of white matter abnormalities. Reversible leucoencephalopathy due to pheochromocytoma have not been documented in literature previously.


Subject(s)
Adolescent , Adrenal Gland Neoplasms/complications , Brain Diseases/etiology , Fever/etiology , Headache/etiology , Humans , Hypertensive Encephalopathy/diagnosis , Magnetic Resonance Imaging/adverse effects , Male , Pheochromocytoma/complications , Syndrome
16.
Arq. bras. cardiol ; 84(5): 428-430, maio 2005. ilus
Article in Portuguese | LILACS | ID: lil-400661

ABSTRACT

Mulher de 24 anos, portadora de marcapasso dupla câmara, com hipertensão intracraniana e perda visual progressiva, e vários exames de tomografia de crânio inconclusivos. Foi submetida à Ressonância Magnética, mesmo sendo este método diagnóstico uma contra-indicação absoluta em portadores de marcapasso.


Subject(s)
Humans , Female , Adult , Magnetic Resonance Imaging , Pacemaker, Artificial , Atrial Fibrillation/etiology , Magnetic Resonance Imaging/adverse effects , Ventricular Fibrillation/etiology
17.
Indian J Biochem Biophys ; 1999 Oct; 36(5): 341-7
Article in English | IMSEAR | ID: sea-28740

ABSTRACT

Magnetic resonance imaging (MRI) is the state-of-the-art noninvasive imaging modality in clinical diagnosis. During MRI examination, the patient is exposed to three different forms of electromagnetic radiation: (i) a static magnetic field, (ii) gradient magnetic fields, and (iii) radiofrequency (RF) fields. Each of these may cause significant adverse bioeffects if applied at sufficiently high exposure levels. This article describes in some detail the areas of health concern for both the patient and the health practitioner with respect to the use of clinical MRI, in addition to describing the potential bioeffects of electromagnetic radiations used in this sophisticated imaging modality.


Subject(s)
Female , Humans , Magnetic Resonance Imaging/adverse effects , Pregnancy
18.
Radiol. bras ; 32(4): 179-92, jul.-ago. 1999. ilus, tab
Article in Portuguese | LILACS | ID: lil-254464

ABSTRACT

Resumo: Selecionamos 135 casos de pacientes que realizaram exame de ressonância magnética da sala turca, no período de setembro de 1991 a agosto de 1996, e que apresentavam galactorréia (G), amenorréia (A) e hiperprolactemia, (H), isoladamente ou em associaçäo. Esses pacientes foram divididos em sete grupos, com base na presença desses sinais e sintomas. Todos os exames foram feitos em clínica privada na cidade do Rio de Janeiro. Correlacionamos os pacientes com os achados de ressônancia magnética e encontramos57 casos de microadenomas, 31 exames normais, 22 macroadenomas, 11 hiperplasias, 7 selas vazias e 7 casos incluídos em "outros achados". O microadenoma predominou nos grupos 1 (GAH), 2(GH), 3(HA) E 5(H), ou seja em todos os que apresentaram hiperprolactenemia. Nos macroadenomas a presença de hipersinal nas sequencias ponderadas em T1 é indicado de apoplexia hipofisária com sangramento intramural. Concluindo, a ressonância magnética é excelente método na avaliaçäo de pacientes com alteraçöes no eixo hipotálamo-hipofisário.


Subject(s)
Humans , Male , Female , Amenorrhea/diagnosis , Galactorrhea , Galactorrhea/diagnosis , Hyperprolactinemia/diagnosis , Magnetic Resonance Imaging/adverse effects , Sella Turcica , Sella Turcica
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