tbuckley/cabot-search huggingface dataset:
How accurate are quotations and references in medical journals?
Authors: J Haworth
Journal: BMJ (1985)

relatively little time available to talk to their inpatients because they are responsible for patients in several hospitals and are also concerned in work in the community, which may be particularly time consuming.Psychiatric firms usually have one junior trainee per site (or part ofone), and there are no housemen, so on call duties are shared by SHOs/registrars, whose posts usually coalesce to form training programmes involving enough firms and units to allow varied experience in a rotating scheme.Cuts in the numbers of junior psychiatric training posts are being proposed in many places and in some cases are draconian.If these numbers are reduced in this way without either a significant increase in consultant numbers or a commensurate increase in non-trainee junior posts then the standard of service may decline unacceptably in many places.Some regions err in supposing that manpower needs and use in psychiatry are essentially the same as in medical and surgical specialties.
Transcriptional networks in at-risk individuals identify signatures of type 1 diabetes progression
Authors: Louis-Pascal Xhonneux, Oliver Knight, Åke Lernmark, Ezio Bonifacio, William A. Hagopian, Marian J. Rewers, Jin-Xiong She, Jorma Toppari, Hemang Parikh, Kenneth G.C. Smith, Anette-G. Ziegler, Beena Akolkar, Jeffrey P. Krischer, Eoin F. McKinney
Journal: Science Translational Medicine (2021)

Transcriptomic analysis identifies progression signatures facilitating prediction of individual T1D risk from 18 months of age in independent cohorts.
Screening for total cholesterol. Do the National Cholesterol Education Program's recommendations detect individuals at high risk of coronary heart disease?
Authors: T LBush, DRiedel
Journal: Circulation (1991)

BACKGROUNDThe National Cholesterol Education Program (NCEP) has provided guidelines for identification of persons at high risk of coronary heart disease (CHD) because of lipid abnormalities. These recommendations are based on total cholesterol as the initial screening tool and have become the stimulus for clinic- and community-based screening programs nationwide. However, the use of the guidelines may be problematic because individuals may have total cholesterol levels in the desirable range but low density lipoprotein (LDL) or high density lipoprotein (HDL) levels considered at high risk. This study evaluates the ability of the NCEP screening recommendations to identify correctly persons at high risk of CHD because of lipid abnormalities.METHODS AND RESULTSUsing the NCEP guidelines, we simulated a population-based screening program with data from visits 1 and 2 of the Lipid Research Clinics Program Prevalence Study. Individuals were considered to be at high risk of CHD if they had LDL levels greater than...
The anatomic substrate for preexcitation in corrected transposition.
Authors: SBharati, KRosen, LSteinfield, R AMiller, MLev
Journal: Circulation (1980)

We report three cases of corrected transposition (CT), all with Ebstein's disease, ventricular septal defect (VSD) and ventricular preexcitation. In cases 1 and 2, the ECG revealed sinus rhythm, with type A fusion preexcitation QRS complexes, suggesting left-sided Kent bundles and intact conduction system (CS). Complete serial section (SS) of the CS in both cases revealed an anterior CS and a Kent bundle in the posteroseptal wall of the morphologic right ventricle (MRV). Case 3 had intermittent preexcitation, with periods of complete atrioventricular (AV) block with narrow QRS escape rhythm. The preexcitation complexes suggested the presence of a left lateral Kent bundle. SS of the CS revealed a blind posterior and two anterior AV nodes, one on either side of the pulmonary trunk. The left anterior AV node was blind. The right anterior node formed the anterior bundle, which ended blindly. This bundle emerged again and joined a posterior bundle to form an interrupted sling around the closed VSD. In addition...
Mechanism of efficacy of 2-amino oleic acid for inhibition of calcification of glutaraldehyde-pretreated porcine bioprosthetic heart valves.
Authors: WChen, F JSchoen, R JLevy
Journal: Circulation (1994)

BACKGROUNDCalcification is a frequent cause of the clinical failures of glutaraldehyde-pretreated bioprosthetic heart valves (BPHV) fabricated from glutaraldehyde-cross-linked porcine aortic valves. 2-Amino oleic acid (AOA) has been shown in previous in vivo studies to be a promising anticalcification agent. Our objective was to investigate the mechanism of calcification inhibition mediated by AOA pretreatment of porcine aortic valve bioprostheses.METHODS AND RESULTSBPHV tissues were treated with an AOA solution for 72 hours before experimentation. The diffusion of AOA across both cusp and aortic wall was evaluated. The lag time for AOA to diffuse across the aortic wall was prolonged compared with that of the cusp. An extraction study was performed to determine the stability of AOA binding; the results indicated that the binding was relatively stable regardless of solvent extraction conditions. The interaction between ionic calcium and AOA on treated tissue also was investigated by evaluating the patterns...
A new scintigraphic method for determining left ventricular volumes.
Authors: KNichols, M HAdatepe, G HIsaacs, O MPowell, D EPittman, T CGay, F RBegg
Journal: Circulation (1984)

A new scintigraphic count-based method for measuring absolute left ventricular volumes is presented. It is a fast and simple technique that allows geometrical assumptions to be avoided and is free of radiation attenuation corrections. This method requires the acquisition of an image of the left ventricle in the right anterior oblique projection and the collection of gated blood pool images in the left anterior oblique projection. To assess the accuracy of the method scintigraphic stroke volumes were compared with those derived from thermodilution measurements during cardiac catheterization in 20 subjects, and to assess its precision the technique was applied to phantom data of known radionuclide volumes. Excellent correlations were found between the scintigraphic and both the thermodilution (r = .98) and phantom data (r = .99). The reproducibility (r = .97) of results was investigated by repeating data acquisition and analysis for 15 subjects on two different days, and the interobserver variability (r = ....
Redo Endoscopic Sleeve Gastroplasty: Repeating does not mean Failing
Authors: C Gallo, MV Matteo, I Boskoski, V Bove, M De Siena, V Pontecorvi, G Carlino, L Laterza, B Orlandini, G Costamagna
Journal: Endoscopy (2021)

Aims Endoscopic Sleeve Gastroplasty (ESG) is an effective and repeatable bariatric procedure, thus some patients may need a redo ESG to increase weight loss. In this case series, we evaluate the technical aspects and short and medium-term outcomes of the redo ESG.
Intravenous pretreatment with A1-selective adenosine analogues protects the heart against infarction.
Authors: J DThornton, G SLiu, R AOlsson, J MDowney
Journal: Circulation (1992)

BACKGROUNDRecent data from this laboratory indicate that pretreatment with adenosine can protect the heart against infarction via A1-receptors, but because of systemic hypotension, adenosine had to be given into the coronary circulation.METHODS AND RESULTSIn this study, we tested whether the protection could be achieved by intravenous administration of the A1-selective adenosine agonists N6-(phenyl-2R-isopropyl)-adenosine (PIA) and 2-chloro-N6-cyclopentyladenosine (CCPA). Nine groups of open-chest anesthetized rabbits were subjected to 30 minutes of regional coronary ischemia and 3 hours of reperfusion. Infarct size was determined by tetrazolium staining. Control hearts receiving no treatment had 38 +/- 4% of the risk zone infarcted. Preconditioning with 5 minutes of ischemia and 10 minutes of reperfusion before ischemia limited the infarct to 8 +/- 4%. Intravenous PIA 15 minutes before 30-minute ischemia also limited infarct size to 6 +/- 2% at the highest dose. CCPA offered similar protection. When the ...
Quantitative analysis of the high-frequency components of the signal-averaged QRS complex in patients with acute myocardial infarction: a prospective study.
Authors: J AGomes, RMehra, PBarreca, Nel-Sherif, RHariman, RHoltzman
Journal: Circulation (1985)

We performed a prospective study of the high-frequency components of the terminal portion of the QRS complex in 50 patients with acute myocardial infarction (AMI) (mean age 63 +/- 10 years) within 3.25 +/- 2.45 days of the acute event. Signal averaging (400 beats) at a filter setting of 80 to 300 Hz was performed and the duration of the low-amplitude signals of less than 40 microV in the terminal portion of the QRS, the root-mean-square (RMS) voltage of the terminal 40 msec of the QRS complex, and the total duration of the signal-averaged QRS vector complex were measured. The low-amplitude signals were abnormally prolonged in 22 of 50 patients (44%); the RMS-V was abnormal (less than 20 microV) in 21 of 50 patients (58%), and the signal-averaged vector complex was abnormal (greater than 120 msec) in 15 of 46 patients (33%) without bundle branch block. There was no significant correlation between any of the signal-averaged parameters and site of AMI or total creatine kinase (CK) and CK-MB values. On the ba...
Intermittent claudication, heart disease risk factors, and mortality. The Whitehall Study.
Authors: G DSmith, M JShipley, GRose
Journal: Circulation (1990)

In the Whitehall study, 18,388 subjects aged 40-64 years completed a questionnaire on intermittent claudication. Of these subjects, 0.8% (147) and 1% (175) were deemed to have probable intermittent claudication and possible intermittent claudication, respectively. Within the 17-year follow-up period, 38% and 40% of the probable and possible cases, respectively, died. Compared with subjects without claudication, the probable cases suffered increased mortality rates due to coronary heart disease and cerebrovascular disease, but the mortality rate due to noncardiovascular causes was not increased. Possible cases demonstrated increased mortality rates due to cardiovascular and noncardiovascular causes. This difference in mortality pattern may be due to chance. Possible and probable cases still showed increased cardiovascular and all-cause mortality rates after adjusting for coronary risk factors (cardiac ischemia at baseline, systolic blood pressure, plasma cholesterol concentration, smoking behavior, employm...
More Evidence That Unnecessary Antenatal Treatments Cause Harm–Reply
Authors: Elizabeth V. Asztalos, Andrew R. Willan, Stephen G. Matthews
Journal: JAMA Pediatrics (2014)

Our website uses cookies to enhance your experience. By continuing to use our site, or clicking "Continue," you are agreeing to our Cookie Policy | Continue JAMA Pediatrics HomeNew OnlineCurrent IssueFor Authors Podcast Publications JAMA JAMA Network Open JAMA Cardiology JAMA Dermatology JAMA Health Forum JAMA Internal Medicine JAMA Neurology JAMA Oncology JAMA Ophthalmology JAMA Otolaryngology–Head & Neck Surgery JAMA Pediatrics JAMA Psychiatry JAMA Surgery Archives of Neurology & Psychiatry (1919-1959) JN Learning / CMESubscribeJobsInstitutions / LibrariansReprints & Permissions Terms of Use | Privacy Policy | Accessibility Statement 2023 American Medical Association. All Rights Reserved Search All JAMA JAMA Network Open JAMA Cardiology JAMA Dermatology JAMA Forum Archive JAMA Health Forum JAMA Internal Medicine JAMA Neurology JAMA Oncology JAMA Ophthalmology JAMA Otolaryngology–Head & Neck Surgery JAMA Pediatrics JAMA Psychiatry JAMA Surgery Archives of Neurology & Psychiatry Input Search Term Sign In Individual Sign In Sign inCreate an Account Access through your institution Sign In Purchase Options: Buy this article Rent this article Subscribe to the JAMA Pediatrics journal
Successful and reproducible myocardial opacification during two-dimensional echocardiography from right heart injection of contrast.
Authors: F SVillanueva, W PGlasheen, JSklenar, A RJayaweera, SKaul
Journal: Circulation (1992)

BACKGROUNDMyocardial contrast echocardiography currently involves intro-arterial injection of contrast. For this technique to have a broader application, it is necessary that myocardial opacification be achieved from a venous injection of contrast.METHODS AND RESULTSTo achieve myocardial opacification after right-side injection of contrast, two groups of open-chest anesthetized dogs were studied. Group 1 included nine dogs in whom microbubbles of various sizes, concentrations, and volumes were injected into the left atrium to determine microbubble characteristics that influence myocardial opacification. Group 2 included eight dogs in whom the effect of the combination of microbubble characteristics and myocardial blood flow on myocardial opacification was evaluated after right atrial injection of contrast. Background-subtracted time-intensity plots were generated from the myocardium to measure peak videointensity. In the group 2 dogs, digital subtraction and color coding were used to further highlight the...
Changes in intramyocardial ST segment voltage and gas tensions with regional myocardial ischemia in the dog.
Authors: S FKhuri, J TFlaherty, J BO'Riordan, BPitt, R KBrawley, J SDonahoo, V LGott
Journal: Circulation Research (1975)

This study was designed to evaluate the sensitivity of changes in myocardial carbon dioxide and oxygen tensions as indicators of regional myocardial ischemia and also to determine to what extent these changes can be related to changes in intramyocardial ST segment voltage. Changes in ST segment voltage recorded in unipolar epicardial electrodes proved to be a less-sensitive indicator of underlying myocardial ischemia than were changes in ST segment voltage recorded in unipolar intramyocardial electrodes. In 9 dogs, regional ischemia was produced by placing a variable constrictor on the left circumflex coronary artery; circumflex flow was monitored. Myocardial carbon dioxide and oxygen tensions were measured using a mass spectrometer. Unipolar electrograms were recorded using a multicontact plunge electrode. With progressive degrees of proximal stenosis, ranging from a critical stenosis, which is associated with a decrease in mean flow of less than 15%, to a severe stenosis associated with and 80% decrease...
Factors Affecting The Diagnostic Performance Of EUS-Guided Sampling In Solid Pancreatic Lesions By Trainee Endoscopists
Authors: M Razpotnik, S Bota, M Kutilek, G Essler, J Weber-Eibel, A Maieron, M Peck-Radosavljevic
Journal: Endoscopy (2021)

Aims EUS is associated with a long learning curve. Both the technical and cognitive skills of the operator are needed to reach the necessary level of competence. We aimed to assess the factors which may influence the accuracy and sensitivity for malignancy in EUS-guided sampling of solid pancreatic lesions by trainees.
Effects of encainide and its metabolites on energy requirements for defibrillation.
Authors: E SFain, PDorian, J MDavy, R EKates, R AWinkle
Journal: Circulation (1986)

Encainide, a class IC antiarrhythmic agent, has been associated with proarrhythmic responses of ventricular tachycardia and fibrillation requiring defibrillation in patients. We examined the short-term effects of intravenous encainide and its two major metabolites, O-demethyl-encainide (ODE) and 3-methoxy-ODE (MODE), on the energy requirements for successful defibrillation in 25 pentobarbital-anesthetized, open-chest dogs. Truncated exponential (60% tilt) defibrillation shocks were administered through right atrial spring and left ventricular epicardial patch electrodes identical to those used in man with the automatic implantable defibrillator. At baseline multiple shocks of varying energy were applied to construct curves of percent successful defibrillation as a function of energy (DF curves) for each animal. Encainide, ODE, or MODE was then infused in loading and maintenance doses to achieve QRS widening of 20% to 50%. Saline was administered to animals serving as controls. Determination of the DF curv...
Heterosexual transmission of acquired immunodeficiency syndrome
Authors: J. R. Johnson
Journal: JAMA (1987)

<h3>To the Editor.—</h3> Fischl and colleagues<sup>1</sup>are to be commended for their study, which provides compelling evidence that use of condoms protects against the transmission of human immunodeficiency virus (HIV) in sexually active heterosexual couples. However, the authors' data suggest an additional conclusion that is of major potential significance to heterosexual couples but that is not clearly delineated in their report or given the emphasis I believe it deserves. It can be inferred from the authors' discussion that the seven male spouses who had a history of other heterosexual partners were all seropositive for HIV at entry into the study. It is also stated that after elimination of these seven subjects from the analyses, gonorrhea and syphilis were no longer significantly associated with seropositivity in men. Thus, it can be suspected that the presence of gonorrhea or syphilis in male spouses was probably a marker for having other heterosexual
Particulate air pollution as a predictor of mortality in a prospective study of U.S. adults.
Authors: C A Pope, M J Thun, M M Namboodiri, D W Dockery, J S Evans, F E Speizer, C W Heath
Journal: American Journal of Respiratory and Critical Care Medicine (1995)

Time-series, cross-sectional, and prospective cohort studies have observed associations between mortality and particulate air pollution but have been limited by ecologic design or small number of subjects or study areas. The present study evaluates effects of particulate air pollution on mortality using data from a large cohort drawn from many study areas. We linked ambient air pollution data from 151 U.S. metropolitan areas in 1980 with individual risk factor on 552,138 adults who resided in these areas when enrolled in a prospective study in 1982. Deaths were ascertained through December, 1989. Exposure to sulfate and fine particulate air pollution, which is primarily from fossil fuel combustion, was estimated from national data bases. The relationships of air pollution to all-cause, lung cancer, and cardiopulmonary mortality was examined using multivariate analysis which controlled for smoking, education, and other risk factors. Although small compared with cigarette smoking, an association between mortality and particulate air pollution was observed. Adjusted relative risk ratios (and 95% confidence intervals) of all-cause mortality for the most polluted areas compared with the least polluted equaled 1.15 (1.09 to 1.22) and 1.17 (1.09 to 1.26) when using sulfate and fine particulate measures respectively. Particulate air pollution was associated with cardiopulmonary and lung cancer mortality but not with mortality due to other causes. Increased mortality is associated with sulfate and fine particulate air pollution at levels commonly found in U.S. cities. The increase in risk is not attributable to tobacco smoking, although other unmeasured correlates of pollution cannot be excluded with certainty.
Transient outward current in human ventricular myocytes of subepicardial and subendocardial origin.
Authors: EWettwer, G JAmos, HPosival, URavens
Journal: Circulation Research (1994)

In various mammalian species, shapes of action potentials vary within the cardiac wall because of differences in transient outward current (Ito). A prominent Ito exists in human ventricular myocytes, but cells have not been separated according to their original localization. Human ventricular myocytes were isolated from separated subepicardial and subendocardial tissue, and regional variations in Ito were studied. Ito was larger in subepicardial than subendocardial cells. Current density at +60 mV was 7.9 +/- 0.7 pA/pF (n = 28) in subepicardial cells and 2.3 +/- 0.3 pA/pF (n = 16) in subendocardial cells. When cells from explanted failing and nonfailing donor hearts were compared, Ito was not different in subepicardial cells; however, it was larger in subendocardial cells from nonfailing hearts. The potential of half-maximal activation (V0.5) was more positive in subendocardial cells (+25.6 +/- 3.5 mV, n = 15) than in subepicardial cells (+9.2 +/- 1.8 mV, n = 28). There was no difference in V0.5 between c...
Meta-analysis with zero-event studies: a comparative study with application to COVID-19 data
Authors: Jia-Jin Wei, En-Xuan Lin, Jian-Dong Shi, Ke Yang, Zong-Liang Hu, Xian-Tao Zeng, Tie-Jun Tong
Journal: Military Medical Research (2021)

Meta-analysis is a statistical method to synthesize evidence from a number of independent studies, including those from clinical studies with binary outcomes. In practice, when there are zero events in one or both groups, it may cause statistical problems in the subsequent analysis.
The physiology of external cardiac massage: high-impulse cardiopulmonary resuscitation.
Authors: G WMaier, G STyson, C OOlsen, K HKernstein, J WDavis, E HConn, D CSabiston, J SRankin
Journal: Circulation (1984)

In intact chronically instrumented dogs, left ventricular dynamics were studied during cardiopulmonary resuscitation (CPR). Electromagnetic flow probes measured cardiac output and coronary blood flow, ultrasonic transducers measured cardiac dimensions, and micromanometers measured left ventricular, right ventricular, aortic, and intrathoracic pressures. The dogs were anesthetized with morphine, intubated, and fibrillated by rapid ventricular pacing. Data were obtained during manual external massage with dogs in the lateral and supine positions. Force of compression was varied from a peak intrathoracic pressure of 10 to 30 mm Hg, and compression rate was varied from 60 to 150/min. Increasing force of compression increased stroke volume up to a peak intrathoracic pressure of approximately 20 mm Hg, beyond which stroke volume remained constant or declined. Stroke volume appeared to result primarily from direct transmission of manual compression force to the heart rather than from positive intrathoracic press...