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Biomedical subjects

N Schad

Publications and source records attributed to N Schad.

At least 73 records · Page 4Linked to original sources
PubMed1977

Nontraumatic assessment of left ventricular wall motion and regional stroke volume after myocardial infarction.

The regional contraction patterns of the left ventricle, shortly after myocardial infarction, were assessed from computer-processed scintigraphic images and histograms of the first transit of an intravenously injected radionuclide bolus. Seventy-seven patients with documented myocardial infarction were injected with a compact bolus of 99mTc-pertechnetate which was coordinated with the ECG so that it arrived in the superior vena cava during diastole. Precordial activity during the initial passage was recorded in 50-msec intervals with a multicrystal scintillation camera interfaced to a dedicated minicomputer. Data frames of 4-7 cardiac cycles were summed into one representative cardiac cycle. In 73 of the 77 patients the images of the representative cycle, along with the corresponding time-activity curves, indicated wall-motion and stroke-volume anomalies corresponding with the electrocardiographic location of the infarct. This nontraumatic, essentially noninvasive technique permits serial examinations of the acutely ill patient for the spatial identification and estimation of suspected myocardial infarcts.

Adult↗
PubMed1976

[Noninvasive demonstration of wall movement and stroke volume distribution of the left ventricle after myocardial infarction (author's transl)].

A noninvasive technique, i.e., the intravenous injection of a bolus of 99mTc, allows one to visualize the wall motion and the stroke volume distribution of the left ventricle after myocardial infarction. Thus, in the first weeks after infarction, it is possible 1) to answer the question of the function of the involved wall segment, 2) to detect early complications, 3) to follow-up the course 4) to estimate the patient's functional status for treatment more accurately and 5) to control the result of treatment. Furthermore, one can calculate the ejection fraction, demonstrate other zones of reduced systolic function and evaluate the degree of congestion in the lung and involvement of the right ventricle. The study is based on 42 examinations in 35 patients with proven myocardial infarction. Only three patients presented normal systolic wall motion. In the remaining 32 patients there was hypokinesia of the infarcted segment partly combined with some temporary dyskinesia during ventricular contraction or with localized akinesia. Three patients had an aneurysm, two a ventricular septal defect and 19 some degree of mitral reflux, in seven congestive heart failure was present. Certain technical requirements are essential for this noninvasive technique. They are discussed in detail. Examples of wall motion and stroke volume distribution of a normal left ventricle, anterior and posterior infarction and an aneurysm are illustrated.

Adult↗