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  • 1
    Electronic Resource
    Electronic Resource
    Nonoperative Closure of the Patent Ductus Arteriosus: The Frankfurt Experience (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 5 (1992), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Nonoperative closure of patent ductus arteriosus (PDA) by means of Ivalon® plugs (according to the technique of Porstmann) was performed in 101 patients. Sixty-five patients were symptomatic, the Qp/Qs ratio exceeded 1.5 in 56 patients, and pulmonary hypertension (mean pulmonary artery pressure 〉 20 mmHg) was present in 50 patients. In 100/101 patients the PDA could be closed successfully. Ninety-nine patients were without any evidence of residual left-to-right shunt. In one patient a hemodynamically insignificant left-to-right shunt was found with color Doppler echocardiography. Complications were pulmonary embolism due to plug dislocation in two patients (12th and 14th patient; 2 and 7 weeks after the procedure, respectively). One of these patients underwent elective surgery with patch closure of the ductus and removal of the embolized plug. In the other patient the ductus was successfully closed with a second larger plug while the first plug was left in a peripheral pulmonary artery. Surgical revision of the femoral artery was required in six and blood transfusion in two patients. Deep venous thrombosis developed in two patients. During follow-up (total follow-up time more than 200 patient years) no late complications were observed. In conclusion, transfemoral catheter closure of PDA by means of Ivalon® plugs is an effective method. It is applicable to adolescents and adults with a low complication rate. The ductus can be closed without residual left-to-right shunt. Long-term results are excellent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.1992.tb00413.x
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  • 2
    Electronic Resource
    Electronic Resource
    Sectoranalysis of left ventricular function by fully automated equilibrium radionuclide ventriculography (1985)
    Springer
    The international journal of cardiovascular imaging 1 (1985), S. 87-97 
    Details
    ISSN: 1573-0743
    Keywords: ejection fraction ; fully automated data processing ; phase analysis ; sectorial analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We describe a fully automated method for quantification of left ventricular performance by equilibrium radionuclide ventriculographic studies, based on subdivision of the left ventricular region into 9 equiangular sectors. The precise identification of the left ventricular contours is achieved by the use of morphological and functional criteria in a sequential edge detection algorithm with a success rate of 96%. In addition to left ventricular global and sectorial ejection fraction the first harmonic of the corresponding Fourier spectrum is approximated to each sectorial time-activity curve and to the global one. Sectorial phase is calculated as the difference between the phase of the sectorial and global first Fourier component. Computerized comparison between the sectorial parameters at rest and during peak exercise localizes and classifies the degree of global and regional impairment in response to exercise. The processing time of 60 sec makes this method suitable for routine use. The validity of our procedure has been tested in 34 patients before and after successful transluminal coronary angioplasty. In these patients, 73% of the stenosed vessels before dilatation were localized by sectorial ejection fraction, 77% by sectorial phases, and 88% by the combination of both.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01786164
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