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Abstract
STUDY OBJECTIVES To determine if plasma levels of atrial natriuretic peptide are elevated in patients with hypertrophic cardiomyopathy and to determine the relationship of atrial natriuretic peptide to symptoms and echocardiographic indices of left ventricular structure and diastolic function in these patients. DESIGN A prospective study in which atrial natriuretic peptide was measured in peripheral venous plasma in 14 patients (age 44 +/- 14 years) with hypertrophic cardiomyopathy and 17 healthy controls. Echocardiography was performed in all cases and 30 controls to examine indices of left heart structure and function. All patients underwent clinical evaluation. RESULTS The concentration of atrial natriuretic peptide was significantly higher in patients with hypertrophic cardiomyopathy than controls, (17.86 +/- 8.72 vs. 6.22 +/- 3.26 pmol/l, P = 0.0001). Diastolic dysfunction was observed in 11 of 14 patients with hypertrophic cardiomyopathy. No correlation was demonstrated between atrial natriuretic peptide levels and the degree of diastolic dysfunction, septal or free wall thickness, left atrial size, degree of mitral regurgitation or New York Heart Association functional class. CONCLUSIONS Plasma levels of atrial natriuretic peptide are elevated in patients with hypertrophic cardiomyopathy but do not correlate with symptoms or echocardiographically-derived indices of left ventricular structure or diastolic function.
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Doppler echocardiographic detection of left ventricular diastolic dysfunction in patients with pulmonary sarcoidosis. Chest 1996; 109:62-6. [PMID: 8549220 DOI: 10.1378/chest.109.1.62] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
STUDY OBJECTIVE To determine the prevalence of left ventricular diastolic dysfunction in patients with biopsy specimen-proved pulmonary sarcoidosis without clinical evidence of cardiac disease. DESIGN A cross-sectional study. SETTING A large tertiary care university teaching hospital. PATIENTS AND CONTROL SUBJECTS Fifty consecutive subjects had biopsy specimen-proved pulmonary sarcoidosis without suspected cardiac involvement. Those with other conditions known to affect diastolic function were excluded. The control group comprised 30 healthy hospital workers. INTERVENTIONS Clinical examination, 12-lead ECG, and combined echocardiographic/phonocardiographic examination. MEASUREMENTS Indexes of left ventricular diastolic function, including isovolumic relaxation time, peak velocity of early (E) and late (A) ventricular filling, deceleration rate of early diastolic flow, and the sum of the time velocity integrals of E and A were obtained in each patient and control subject. Systolic function was determined using a modification of Simpson's rule. RESULTS Diastolic dysfunction was present in 7 (14%) patients, 6 of whom had normal systolic function and normal two-dimensional echocardiographic examination. Those with diastolic dysfunction had a longer duration of illness (15 +/- 7 vs 6 +/- 5 years; p = 0.0004), were significantly older (52 +/- 11 vs 38 +/- 9 years; p = 0.0009), and had higher systolic BP (130 +/- 13 vs 117 +/- 12 mm Hg; p = 0.01) than the sarcoid patients with normal diastolic function. CONCLUSIONS These results demonstrate a significant prevalence of left ventricular diastolic dysfunction in patients with pulmonary sarcoidosis. The cause of this abnormality may be a subclinical sarcoid cardiomyopathy.
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Abstract
The present report documents a case of squamous cell carcinoma originating from the thymus of a 12-year-old short-haired male cat. The tumour had metastasised to the sternal lymphoid tissue and to the left lung. To the authors' knowledge, thymic carcinoma has not been reported in domestic animals. Furthermore, extensive apoptosis was observed in the tumour mass.
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Abstract
Although cardiac involvement in the form of conduction abnormalities or aortic regurgitation occurs in 5 to 10% of patients with ankylosing spondylitis, few studies have assessed left ventricular (LV) function. This study assesses the prevalence of both systolic and diastolic LV dysfunction and other cardiac abnormalities in patients with ankylosing spondylitis who have no clinical cardiac manifestations. Fifty-nine patients (49 men and 10 women, mean age 42 +/- 10 years) underwent full clinical examination, electrocardiography, 24-hour Holter monitoring and 2-dimensional, M-mode and Doppler echocardiography. Mean disease duration was 17 +/- 9 years (range 1 to 42). Seventeen patients had evidence of noncardiac extraarticular manifestations. Precordial examination was normal in all. An age- and sex-matched control group of 44 healthy subjects was also studied. On echocardiography, abnormal LV diastolic function was detected in 12 patients (20%). Prolonged isovolumic relaxation time, prolonged deceleration time, reduced rate of descent of flow velocity in early diastole (EF slope) and reversal of the early and late peak transmitral diastolic flow velocities (E/A ratio) were noted in 9 patients. In 3 patients there was an increased E/A ratio, reduced deceleration time and increased EF slope. Mild aortic regurgitation and mitral regurgitation was seen in 1 and 3 patients, respectively. No abnormalities of left atrial size, LV systolic or diastolic dimensions or wall thicknesses were noted. There was no correlation between the presence of LV diastolic dysfunction and age, disease severity, disease duration, or the presence of extraarticular manifestations.(ABSTRACT TRUNCATED AT 250 WORDS)
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Irish cardiac society. Ir J Med Sci 1993. [DOI: 10.1007/bf02945184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Inaugural national scientific medical meeting. Ir J Med Sci 1993. [PMCID: PMC7101915 DOI: 10.1007/bf02942100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Abstract
A new radiopaque, highly flexible balloon-expandable tantalum stent was tested. Thirty-six of 40 stents were successfully deployed percutaneously in the coronary arteries of 31 dogs. The dogs were given aspirin before, intravenous heparin during, and aspirin alone after the procedure. One dog died at 24 hours because of coronary occlusion following traumatic implantation. Four dogs were put to death early, revealing re-endothelialization by 9 days. Eleven dogs were put to death from 2 weeks to 9 months during long-term follow-up, showing all vessels widely patent with the stent uniformly embedded within a stable neointimal layer. Follow-up arteriography showed patency in all remaining stents up to 1 year, with no perforation or aneurysm formation. Four stents were placed into canine peripheral arteries and were removed percutaneously after deployment. Pathology revealed no significant trauma to involved vessels. This tantalum stent exhibits feasibility of percutaneous deployment, early neointimal formation, low thrombogenicity on long-term aspirin therapy alone, and patency up to 1 year in this canine model.
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Prospective analysis of possible myocardial damage or hemolysis occurring as a result of prolonged autoperfusion angioplasty in humans. J Am Coll Cardiol 1992; 20:594-8. [PMID: 1512338 DOI: 10.1016/0735-1097(92)90013-d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVES The purpose of this study was to further explore the procedural safety of prolonged (15-min) dilation using an autoperfusion coronary angioplasty balloon by assessing the degree of myocardial damage or hemolysis, if any, occurring as a result of the procedure. BACKGROUND Prolonged balloon inflation periods may be beneficial during percutaneous transluminal coronary angioplasty. The duration of standard balloon angioplasty is often limited by the occurrence of myocardial ischemia due to loss of anterograde blood flow. Autoperfusion angioplasty allows continued myocardial perfusion during balloon inflation and has previously been shown to reduce but not totally eliminate acute myocardial ischemia during prolonged (up to 15 min) balloon inflation. The risk of intravascular hemolysis as a result of autoperfusion angioplasty has not yet been fully delineated. METHODS Sixty-two consecutive patients (76% men; mean age 58 years) undergoing elective percutaneous transluminal coronary angioplasty of a single lesion were studied. Serial electrocardiographic and creatine kinase MB isoenzyme data were examined to detect evidence of myocardial damage. Tests for hemolysis (plasma free hemoglobin, serum haptoglobin and serum lactate dehydrogenase) were obtained in the 1st 24 consecutive patients. RESULTS Inflation time was 14 +/- 4 min (mean +/- SD) and the procedure was successful (less than or equal to 50% residual lesion stenosis) in 59 patients (95%). Electrocardiographic evidence of myocardial infarction (greater than 1 mm persistent ST segment depression, greater than 1 mm ST segment elevation or new Q waves) was not observed in any patient. Cardiac enzyme assays were within the normal range in all patients. No evidence of hemolysis was found in the 24 consecutive patients studied. CONCLUSIONS We conclude that prolonged autoperfusion angioplasty can be performed in patients without clinical evidence of myocardial damage or hemolysis.
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Coronary angioplasty performed with gradual and prolonged inflation using a perfusion balloon catheter: procedural success and restenosis rate. Am Heart J 1992; 124:585-9. [PMID: 1514483 DOI: 10.1016/0002-8703(92)90263-u] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The results of routine coronary angioplasty using gradual and prolonged balloon inflation with a perfusion balloon catheter were evaluated. One hundred forty patients were treated with inflation of the balloon to 6 atm over 3 minutes, with a median inflation time of 15 minutes. The procedural success rate (residual stenosis less than or equal to 50%) was 99%. In-hospital major complications occurred in five patients (3.6%), with one patient experiencing a periprocedural infarction, three patients requiring bypass surgery for abrupt closure, and one patient dying after elective bypass surgery following previous successful angioplasty of a culprit lesion. The restenosis rate in the 117 patients with angiographic follow-up (87% of those eligible) was 42%. Thus gradual and prolonged inflation using a perfusion balloon catheter resulted in a high procedural success rate and a restenosis rate similar to that reported in large studies of patients treated with standard angioplasty. These results warrant further study using a prospective randomized trial design.
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Irish cardiac society. Ir J Med Sci 1992. [DOI: 10.1007/bf02942092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Irish Cardiac Society Proceedings of meeting held 23rd–24th November, 1990. Ir J Med Sci 1991. [DOI: 10.1007/bf02957865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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The use of intraaortic balloon pumping as an adjunct to reperfusion therapy in acute myocardial infarction. The Thrombolysis and Angioplasty in Myocardial Infarction (TAMI) Study Group. Am Heart J 1991; 121:895-901. [PMID: 1900381 DOI: 10.1016/0002-8703(91)90205-v] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To assess the risk and possible benefits of use of the percutaneous IABP in patients given thrombolytic therapy as treatment for acute myocardial infarction, we prospectively evaluated 810 consecutive patients entered into the TAMI trials. During hospitalization the 85 patients treated with the IABP had more cardiac risk factors, were slightly older (58 vs 56 years), and more often had anterior infarction (62% vs 38%). At acute cardiac catheterization, patients treated with the IABP also had more multivessel coronary disease (67% vs 43%), more frequent TIMI grade 0 or 1 flow (44% vs 28%), lower global ejection fraction (40% vs 52%), and worse regional infarct (-3.2 vs -2.5 SD/chord) and noninfarct (-0.67 vs +0.36 SD/chord) zone function. Although mortality rates (32% vs 4%) and in-hospital complications were greater in patients treated with the IABP, a greater improvement in global (delta ejection fraction: +1.9% vs +0.7%) and noninfarct zone (delta SD/chord: +0.11 vs -0.09) left ventricular function was observed in patients treated with the IABP at 1-week follow-up angiography. In addition, no reinfarction or reocclusion of the infarct-related artery occurred while patients were being treated with the IABP. These results suggest that the IABP may have a specific role after thrombolytic therapy in treating patients at high risk for reocclusion or at high risk for hemodynamic deterioration because of large infarction or critical stenoses in coronary vessels supplying the noninfarct zone.
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Abstract
One hundred seventeen consecutive patients undergoing repeat percutaneous transluminal coronary angioplasty (PTCA) were studied to assess procedural success and recurrent restenosis rates. Clinical, anatomic and procedural variables were examined as predictors of recurrent restenosis using stepwise logistic regression analysis. Primary success was achieved in 114 patients (97.5%). One patient (0.8%) died after acute occlusion. No other in-hospital complications were encountered. After a mean follow-up interval of 218 +/- 160 days, 72 of 114 successfully dilated patients (63%) remained angina free. There were no late deaths. Three patients (2.6%) experienced a late myocardial infarction. Follow-up arteriography was performed in 100 patients (88%), of whom 32% had recurrent restenosis (greater than 50% luminal diameter narrowing). On univariate analysis, the presence of 3 clinical variables at repeat PTCA was associated with significantly higher recurrent restenosis rates compared with their absence, that is, unstable angina (48 vs 20%, p = 0.003), diabetes (61 vs 26%, p = 0.003) and hypertension (46 vs 18%, p = 0.003). Patients with recurrent restenosis had a shorter interval between first and second PTCA compared with those who remained patent (136 +/- 116 vs 214 +/- 163 days, p = 0.018). Multivariate analysis confirmed unstable angina, diabetes and hypertension as independent predictors of recurrent restenosis. Repeat PTCA may be performed for restenosis with a high likelihood of success and low incidence of complications. The rate of recurrent restenosis is similar to that reported for initial angioplasty. Patients with unstable angina, diabetes and hypertension appear to be at higher risk for recurrent restenosis.
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Abstract
An autoperfusion balloon catheter was developed to allow passive myocardial perfusion during inflation through a central lumen and multiple side holes in the shaft proximal and distal to the balloon. We report its safety and efficacy in 11 patients undergoing elective angioplasty to a single coronary lesion. Each lesion was dilated three times with the autoperfusion inflation bracketed between two inflations by standard angioplasty catheters. Chest pain score, 12-lead electrocardiogram, heart rate, and mean aortic pressure were recorded before each inflation and at 1-minute intervals after inflation. Inflation duration during autoperfusion angioplasty (513 +/- 303 seconds) was longer than for the pre- (107 +/- 55 seconds, p = 0.0004) and post- (139 +/- 71 seconds, p = 0.0006) standard dilatations. The maximum ST-segment elevation and depression in any lead during autoperfusion angioplasty (0.3 +/- 0.5 and 0.6 +/- 0.8 mm) was significantly less than for the pre- (2.4 +/- 1.7 mm, p = 0.002 and 2.2 +/- 1.3 mm, p = 0.0004) or post- (1.9 +/- 1.3 mm, p = 0.002 and 1.6 +/- 1.3 mm, p = 0.018) standard dilatations at the same point in time. Maximal chest pain score during autoperfusion (3.2 +/- 3.5) was lower than for the pre- (6.1 +/- 2.1, p = 0.003) but not the post- (5.2 +/- 3.1, p = 0.07) standard angioplasty. All 11 patients underwent successful, uncomplicated procedures. We conclude that this autoperfusion catheter significantly reduces ischemic symptoms and signs during coronary angioplasty, allowing prolonged periods of balloon inflation.
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Interventional cardiac catheterization at Duke Medical Center. Am J Cardiol 1988; 62:3F-24F. [PMID: 2972185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
An autoperfusion balloon catheter was developed to allow passive myocardial perfusion during balloon inflation, through a central lumen and multiple side holes in the shaft proximal and distal to the balloon. This report reviews preliminary experimental animal data and initial human clinical experience with this device. In our first study with this device, the duration of inflation in dogs was compared with the maximal duration of inflation using a standard angioplasty catheter. Coronary arteriography was performed to demonstrate distal coronary blood flow through the perfusion balloon catheter. Electrocardiographic recordings and repeated left ventriculograms were performed to detect evidence of ischemia during standard and perfusion and balloon catheter inflations. The average inflation time was 3 +/- 1 minute for the standard catheter and 37 +/- 10 minutes for the perfusion catheter. Each dog had evidence of severe myocardial ischemia during standard inflation, yet none of the animals had ST-segment elevation, ventricular arrhythmia or wall motion abnormality during dilatation with the perfusion catheter. In a second experiment, the effect of prolonged balloon inflations (30 minutes) on intimal hyperplasia was evaluated in the rabbit model. Results of this study showed reduction of intimal and medial hyperplasia after 4 weeks in iliac arteries in rabbits treated with prolonged inflations compared with the contralateral vessel in rabbits treated with standard angioplasty. Initial clinical results from patients treated with this new catheter are presented. The availability of an effective autoperfusion catheter should allow for testing the hypothesis that prolonged inflations could alter the acute angioplasty success rate and long-term restenosis rate.
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Abstract
The potential of contrast enhanced digital subtraction echocardiography to demonstrate and quantitate myocardial perfusion was evaluated in 36 patients undergoing routine coronary arteriography or angioplasty. In 24 technically successful studies, multiple cross sectional echocardiographic images, obtained before and after intracoronary (sonicated contrast) injection, were stored by high speed, real time data transfer to an on line minicomputer. Subsequent digital subtraction processing of the stored image data provided composite images in which the distribution of myocardial perfusion was easily seen. Quantitative analysis of peak enhanced myocardial grey level and washout half time successfully differentiated between myocardial segments in which angiography had suggested normal, reduced, and grossly impaired or absent perfusion. The results suggest that this new method of digital image capture and quantitative processing has substantial advantages over previous off line qualitative techniques. It is likely to be of considerable value for routine coronary arteriography, angioplasty, and coronary thrombolysis.
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Abstract
Spine densities on terminal branches of Purkinje cell dendrites of Fischer 344 rats were significantly altered by ethanol treatment and aging processes. An effect of the control liquid diet on the lengths of terminal branches and an interaction effect of this diet with age on the numbers of terminal branches/cell also occurred, but there were no detectable interaction effects of ethanol with age on dendritic parameters. Changes in spine density on terminal branches, which accounted for 63-67% of the total dendritic length/cell, represented a major quantitative modulation of synaptic input to these neurons during age and following ethanol treatment.
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Abstract
Percutaneous transluminal coronary angioplasty was performed in 25 patients with unstable angina and in a similar group of 25 patients with stable angina. The frequency of single, double, and triple vessel disease was identical in each group. Technical success was achieved in 22 (81%) out of 27 attempts in those with unstable angina and in 14 (52%) out of 27 attempts in those with stable angina. Vessel occlusion occurred in nine patients, necessitating emergency bypass surgery in four. There was evidence of myocardial infarction in three patients in each group and one patient in the unstable group subsequently died. Twenty eight of 32 successfully treated patients were followed up by means of repeat coronary arteriography, exercise electrocardiography, and clinical assessment after a mean (SD) interval of 14 (7) months. There was angiographic evidence of restenosis in 32% (seven of 22) of lesions in the unstable group and 44% (four of nine) of lesions in the stable group. There were no late infarctions or deaths during the follow up period. These results support the growing evidence that angioplasty can be carried out safely and effectively in patients with unstable angina.
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Abstract
The purpose of this study was to examine the usefulness of digital subtraction angiography in the evaluation of left ventricular function (LVF). LVF was examined in 24 patients by three methods, (a) conventional ventriculography using an intraventricular injection (CLV) of 40 ml of contrast medium, (b) small volume (10-15 ml) left ventriculogram (SVLV) and (c) intravenous injection of 30 ml contrast medium (IVLV). Images were recorded via a conventional image intensifier--TV chain on to video tape and later analysed using a nuclear medicine computer with a digital interface. There was excellent correlation of ejection fraction and wall motion abnormalities between CLV and SVLV methods (r = 0.92 and r = 0.71, respectively) and good correlation between CLV and IVLV methods (r = 0.88 and r = 0.67, respectively). However, only minimal contrast induced premature ventricular contractions were observed in either the SVLV or IVLV methods compared with approximately 60% in the CLV method. Exclusion of studies containing ectopic cardiac cycles considerably improved the correlation between CLV and SVLV (r = 0.97) and between CLV and IVLV methods (r = 0.95). In conclusion, our results indicate that conventional left ventriculography may be replaced by either intravenous or small volume intraventricular methods with little loss of wall motion definition or error in ejection fraction estimation. The less invasive nature of the SVLV and IVLV methods should increase the usefulness of left ventriculography and extend its application to the assessment of left ventricular reserve under stress and during drug intervention.
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Irish cardiac society. Ir J Med Sci 1984. [DOI: 10.1007/bf02937158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
This account of 58 spontaneous tumors involving bone in domestic cats compares and contrasts the pathological findings with previous surveys. Of the tumors described, only one was diagnosed as benign. Squamous cell carcinoma was the most common tumor of the series; osteosarcoma was the most common primary tumor. Only two tumors metastasized to the lungs (one hemangiosarcoma and one osteosarcoma), and only three metastasized to a regional node (two squamous cell carcinomas and one lymphosarcoma).
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Exercise electrocardiography, exercise myocardial scintigraphy and radionucleotide angiography in patients with significant coronary artery disease. IRISH MEDICAL JOURNAL 1983; 76:310-2. [PMID: 6885327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Critical coronary artery disease with minimal symptoms. IRISH MEDICAL JOURNAL 1982; 75:364-6. [PMID: 7174250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Skin transplantation in two cats. Vet Rec 1976; 98:52-3. [PMID: 769298 DOI: 10.1136/vr.98.3.52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Xanthogranulomatous pyelonephritis. A comparison of the disease in the cat and man with special reference to the origin of the fat. J Clin Pathol 1972; 25:397-400. [PMID: 4114697 PMCID: PMC477333 DOI: 10.1136/jcp.25.5.397] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The origin of the intracellular fat in human xanthogranulomatous pyelonephritis has been the centre of some discussion in the past. A report of a case in a domestic cat is of interest as normal feline renal epithelium is rich in stainable fat. A comparison of the human and feline varieties of xanthogranulomatous pyelonephritis reveals certain fundamental differences between the two and reinforces the view that the fat concerned in the human disease does not originate in the renal epithelium.
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Open reduction repair of fractures of the distal shaft of the humerus in the dog: a report of 13 cases. Vet Rec 1972; 90:419-24. [PMID: 5036807 DOI: 10.1136/vr.90.15.419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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