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99mTc-labelled phosphates (PyP, IDP and MDP) were compared for their usefulness for the diagnosis of myocardial infarction. The results indicated the superiority of 99mTc-labelled imidodiphosphonate over the other 99mTc-labelled phosphates. At the same time, two mobile gamma cameras were compared with respect to their instrumental characteristics and clinical versatility and their advantages and disadvantages are reported.

Fecal lipid excretion was quantitated and analyzed in two groups of normal infants 3 to 11 days and 23 to 72 days of age. Total lipid excretion was similar in both groups averaging 10.8% of dietary intake. Fecal lipid was partitioned into four fractions: neutral lipids, insoluble divalent calcium soaps, ionized fatty acids and bound lipids. The neutral lipid fraction predominated in both groups, equalling 56 ± 5.3% (mean ± S.E.M.) of fecal lipid. It contained significant quantities of glycerides (13.6 ± 6.0% of the total lipid excreted). Calcium soaps comprised the other major fraction (25 ± 5.3%); analysis of this fraction by gas liquid chromatography showed that it contained primarily long-chain saturated fatty acids. The demonstration of glycerides in fecal lipid establishes that lipolysis is defective in newborn infants. Identification of long-chain saturated fatty acids in the calcium soap fraction documents the association between calcium and saturated fatty acid excretion. The presence of fecal monoglyceride, while conceivably the result of colonic bacterial hydrolysis of triglyceride, raises the possibility that lipid micellization and/or mucosal transport is insufficient for optimal lipid absorption. Thus, the intraluminal phase and possibly the mucosal phase of lipid absorption are not fully developed in the full-term newborn infant.

The data from 84 patients with suspected embolic lung disease who underwent radionuclide section scanning of the chest is reported. All underwent additional conventional planar imaging; specific angiographic evidence of embolic disease was available in 12 cases. A good correlation between the section scans and angiography was obtained. Greater sensitivity in lesion detection was obtained by multiplane section imaging, which should reduce the number of diagnostic uncertainties in embolic lung disease.

SummaryThe use of multiple gated cardiac imaging in the diagnosis of left ventricular pseudo-aneurysm is reported and the clinical and therapeutic implications are discussed. Complemented with myocardial perfusion imaging, it is the method of choice for screening patients following infarction or chest trauma who may develop this potentially treatable complication of myocardial necrosis.

Malgre la disponibilite de stimulateurs du lype physlologique, il restent des inconvenients inherenls a leur fonctionnement. En theorie, les sfimulaleurs synchrones de ľoreillette (VDD ou DDD) sont ideal, mais en pratique leur performances sont limitees pur un fourchelte assez etroite des frequences cardioques chez un certain nombre de majades. Nous decrivons donc le systeme TX qui incorpore a la fois la stimulation ventriculaire, et le recueil de ľonde T determine par ľespace QT. Ge stimulateur TX distingue entre tachycardies physiologiques et pathologiques, et fournit un rythme asservi meme en ľabsence ?activite auriculaire. Despite the current availability of physiologic pacing systems, there remain distinct disadvantages associaled with their operation. Although in theory the atrial synchronous pacemaker (VDD or DDD) is the ideal system, in practice it performs satisfoctorily over a very limited range of heart rates in a limited number of individuals. We describe the TX system which incorporates ventricular pacing and is driven by T wave sensing determined by the QT interval. This pacemaker can distinguish between physiologic and pothologic tachycardias while providing an almost unlimited rate response even in the presence of on unresponsive atrium.