451
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Nasrallah A, Hall RJ, Garcia E, Kyger ER, Hallman GL, Cooley DA. Runaway pacemaker in seven patients: a persisting problem. J Thorac Cardiovasc Surg 1975; 69:365-8. [PMID: 1117729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Runaway pacemaker has been encountered in 7 patients during the past 7 years at the Texas Heart Institute. In this series, 4 patients with fixed-rate pacemakers experienced pacemaker arrhythmias because of battery depletion, and 3 had arrhythmias because of component failure. Battery deterioration was heralded by an increase in cardiac rate. Ventricular tachycardia, rapidly followed by ventricular fibrillation, occurred in 2 patients. Prompt surgical exteriorization of the failing pulse generator and connection to an external pacemaker resulted in prompt recovery in all patients. Elective generator change should be performed routinely after 24 to 30 months unless reliable serial observations of ventricular rates can be attained. This at least will reduce the lethal complications attributed to battery exhaustion. Increasing developments in the design of generators and sources of power, as well as data from pacemaker clinic follow-up and telephone pulse transmittal, are expected to decrease the frequency of this complication.
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452
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Nasrallah A, Goussous Y, El-Said G, Garcia E, Hall RJ. Pulmonary artery compression due to acute dissecting aortic aneurysm: clinical and angiographic diagnosis. Chest 1975; 67:228-30. [PMID: 1116402 DOI: 10.1378/chest.67.2.228] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Clinical and angiographic features simulating acute massive pulmonary embolism, the result of compression of the right and main pulmonary arteries by a dissecting hematoma, are described in a 52-year-old white woman.
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453
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Nasrallah AT, Garcia E, Benry J, Hall RJ. Treadmill exercise testing in the presence of digitals therapy or nonspecific ST-T changes: correlation with coronary angiography. CATHETERIZATION AND CARDIOVASCULAR DIAGNOSIS 1975; 1:375-80. [PMID: 1222434 DOI: 10.1002/ccd.1810010406] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Treadmill exercise test results were studied in 93 patients with chest pain who had received digitalis therapy or had nonspecific ST-T changes in the resting electrocardiogram. Results of the treadmill test were correlated with the findings of coronary angiography. A positive treadmill result was defined as horizontal or down-sloping ST segment depression greater than or equal to 1.0 mm. Of the 40 patients with no or insignificant coronary artery disease, 15 had taken digitalis; 4 of the 15 demonstrated a positive response on the treadmill test. Of the 53 patients with coronary artery disease, 21 had taken digitalis; 15 of the 21 displayed a positive response. Among the remaining 32 not on digitalis, 20 had a positive response. The specificity of the treadmill exercise test was 96% in patients with coronary artery disease not on digitalis and whose resting electrocardiogram showed nonspecific ST changes. The specificity of the treadmill test in patients who had received digitalis was 73%. Sensitivity was 63% and 71%, respectively. By utilizing more stringent criteria in the interpretation of the treadmill exercise test (greater than or equal to 1.5 mm ST depression), among the patients on digitalis only 6.7% (1/15) with normal coronary arteries and 48% (10/21) with coronary artery disease had a positive response. With the use of the latter criterion the test was specific in 93% (14/15) of the patients and is usually indicative of coronary artery disease.
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454
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Al-Bassam M, Dawson J, Garcia E, Hall R, Hallman G, Cooley D. Evaluation of risk factors and follow-up in women following coronary artery bypass. Am J Cardiol 1975. [DOI: 10.1016/0002-9149(75)90575-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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455
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Urena MT, Barasoain I, Espinosa M, Garcia E, Portoles A. Evaluation of different antibiotic actions combined with rifampicin. In vitro synergism against Pseudomonas and Proteus. Chemotherapy 1975; 21:82-9. [PMID: 169107 DOI: 10.1159/000221850] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Associations of penicillin, streptomycin, tetracycline and polymyxin B with rifampicin were tested for synergism against Pseudomonas and Proteus pathological strains. The combination of rifampicin and polymyxin B was clearly synergistic for all strains as it was evaluated by isobolograms and killing curvesmthe bactericidal action of this association, without any cross-resistance between its components, may eradicate gram-negative bacteria infections with marked polyvalent drug resistances.
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456
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Peters MN, Hall RJ, Cooley DA, Leachman RD, Garcia E. The clinical syndrome of atrial myxoma. JAMA 1974; 230:695-701. [PMID: 4479298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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457
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Stark H, Garcia E. Image analysis using enhanced spatial correlation functions. APPLIED OPTICS 1974; 13:1828-1832. [PMID: 20134578 DOI: 10.1364/ao.13.001828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
By enhancing the high frequencies of the irradiance spectrum of a scene, it is possible to reconstruct an enhanced self-correlation function that clearly delineates its nondifferentiable regions. The technique has application in image analysis and pattern recognition. By way of example, the enhanced self-correlation function of a certain random process is furnished. Easily discernible are certain periodicities not apparent in the sample functions of the original process.
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458
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Stark H, Garcia E. Use of a diffuser for producing texture masks for image processing. APPLIED OPTICS 1974; 13:648-658. [PMID: 20126038 DOI: 10.1364/ao.13.000648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The use of a diffuser in synthesizing binary texture-variance masks for applications in image processing is investigated. The binary texture-variance masks are used to separate various objects in an image on the basis of their spatial texture variance. The diffuser is required to reduce the speckling present in the mask. The reduction in speckling is described quantitatively as a reduction of the misclassification probability associated with the separation of the objects into several texture classes. General results are furnished for the statistics of the field scattered by the diffuser, and these are used to obtain expressions for the misclassification probabilities in the presence of a diffuser. Some applications are furnished.
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459
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Garcia E. The training and generalization of a conversational speech form in nonverbal retardates. J Appl Behav Anal 1974; 7:137-49. [PMID: 4465370 PMCID: PMC1311657 DOI: 10.1901/jaba.1974.7-137] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Differential reinforcement and imitation were used with two retarded children to train three sequential verbal responses associated with the display of a picture and questions related to that picture. Each response consisted of a three-word chain in sentence form; combined with verbal responses from the experimenter, this trained sequence formed a short conversational unit. Three experimenters measured the use of each sentence in settings different than the one in which training took place, and with pictures different than those used during training. Two types of generalization sessions were used: (1) General sessions, during which 10 pictures never used during training were displayed to the subject with reinforcement delivered on a noncontingent basis, and (2) Intermixed sessions, during which 10 pictures never used during training were displayed to the subject, but a picture having received training was also displayed, and correct responses to this picture were reinforced on a variable schedule. Both subjects learned the sentences being trained. However, little generalization was evident from this training when all experimenters conducted General probe sessions. Generalization occurred with one experimenter only after that experimenter conducted Intermixed probe sessions. Generalization to a third experimenter was then observed (i.e., after the first two experimenters had conducted Intermixed probe sessions) without the use of Intermixed probe sessions by this third experimenter.
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460
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Lautier F, Cvoric M, Garcia E, Lavillaureix J. Techniques de recherche de l’antigène HB. Pathobiology 1974. [DOI: 10.1159/000162531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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461
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Cooley DA, Dawson JT, Hallman GL, Sandiford FM, Wukasch DC, Garcia E, Hall RJ. Aortocoronary saphenous vein bypass. Results in 1,492 patients, with particular reference to patients with complicating features. Ann Thorac Surg 1973; 16:380-90. [PMID: 4542873 DOI: 10.1016/s0003-4975(10)65009-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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462
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Abstract
From October 1969 through March 1972, 1,276 patients underwent coronary artery bypass at the Texas Heart Institute. Associated conditions included simultaneous valve replacement and resection or repair of ventricular aneurysms or ascending aortic aneurysms. Among the series were 1,105 patients who underwent bypass surgery alone, with or without endarterectomy.
Factors affecting outcome were analyzed and revealed adverse influences including concomitant endarterectomy, female sex, age, evidence of left ventricular failure or serious ventricular dysfunction, and previous myocardial infarction within the month before surgery, but more importantly within the week prior to surgery. Functional class III and IV angina was significantly decreased or totally relieved in a high percentage of patients after bypass surgery, and remains the major indication at this time for myocardial revascularization. Progressive reduction in surgical risk and improvement in patient selection allow coronary artery bypass to be performed currently with an early mortality risk of only 3.7%.
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463
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Owens DW, Garcia E, Pierce RR, Castrow FF. Klippel-Trenaunay-Weber syndrome with pulmonary vein varicosity. ARCHIVES OF DERMATOLOGY 1973; 108:111-3. [PMID: 4716730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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464
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Stark H, Garcia E. Comments on: Measurements of the Correlation Length of Random Scenes by a Coherent Optical Method. APPLIED OPTICS 1973; 12:167785. [PMID: 20125218 DOI: 10.1364/ao.12.0131_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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465
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Hall RJ, Dawson JT, Cooley DA, Hallman GL, Sandiford FM, Wukasch DC, Garcia E. Coronary artery bypass. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1973; 39:249-61. [PMID: 4543659 DOI: 10.1007/978-1-4615-9020-0_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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466
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Mullins CE, el-Said G, McNamara DG, Cooley DA, Treistman B, Garcia E. Atresia of the left coronary artery ostium. Repair by saphenous vein graft. Circulation 1972; 46:989-94. [PMID: 4538780 DOI: 10.1161/01.cir.46.5.989] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Symptoms and electrocardiographic changes of acute myocardial ischemia in a 10-year-old boy resulted from congenital atresia of the ostium of the left coronary artery. At 14 years of age persistence of symptoms and a positive exercise test prompted surgical treatment by aortocoronary artery saphenous vein bypass graft. Two months postoperatively, the symptoms and the abnormal findings on exercise test had subsided and forward flow through the graft to the left coronary artery was demonstrated by contrast angiography.
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467
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Garcia E, Stark H, Barker RC. Variance measurements by a coherent optical method, with application to image processing. APPLIED OPTICS 1972; 11:1480-1490. [PMID: 20119174 DOI: 10.1364/ao.11.001480] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A procedure for measuring the point-to-point local variance of a spatial random scene is discussed. The relations that are required between the second-order statistics of the random process and the parameters of the optical configuration to furnish accurate and stable variance estimates are established. The procedure is experimentally verified by using calibrated samples of the random checkerboard and the overlapping circular grain models. A modification of the procedure enables the generation of spatial masks that are useful in automatic image processing. The spatial masks are used as binary spatial gates to isolate certain classes of objects within a scene and reject all others. Typical masks are synthesized and their applications illustrated.
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468
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469
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Beard EF, Garcia E, Burke GE, Dear WE. Postexercise electrocardiogram in screening for latent ischemic heart disease. A study with clinical follow-up observation. Calif Med 1969; 56:405-8. [PMID: 5347249 DOI: 10.1378/chest.56.5.405] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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470
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Garcia E, Michenfelder JD, Theye RA. Right atrial oxygen levels during anaesthesia and surgery. CANADIAN ANAESTHETISTS' SOCIETY JOURNAL 1968; 15:593-602. [PMID: 5726829 DOI: 10.1007/bf03004355] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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471
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Nelson WP, Hall RJ, Garcia E. Varicosities of the pulmonary veins simulating arteriovenous fistulas. JAMA 1966; 195:13-7. [PMID: 5951825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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472
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Saavedra MA, Garcia E, Pinto-Hamuy T. Acquisition of auditory conditioned responses in normal and neodecorticate rats. ACTA ACUST UNITED AC 1963. [DOI: 10.1037/h0040479] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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473
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Layrisse M, Layrisse Z, Garcia E, Wilbert J. Blood Group Antigen Tests of the Yaruro Indians. ACTA ACUST UNITED AC 1961. [DOI: 10.1086/soutjanth.17.2.3629143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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