Search

Progeny of combinations of one susceptible line (Mp420) with three resistant maize (Zea maysL.) lines (T204, GT11, and CI21) were tested for three gorwing seasons to determine the genetics of host reaction to the leafhopper‐transmitted corn stunt virus. Dominance for resistance or susceptibility was lacking. The influence of heterosis favoring virus tolerance was apparent. Results indicated a relatively simple inheritance pattern. Studies of effects of genes indicated a strong additive influence, no dominance, and insignificant epistatic effects. A recurrent selection scheme would appear to be best for transferring resistance to susceptible material. If the plant breeder desires to transfer resistance to specific genotypes, a recurrent‐backcross approach is proposed where resistant segregates would be recombined before the1 next backcross. The approach is suggested also for other traits controlled by few genes, including modifiers.

Resection of unusually large pseudoaneurysms of the aortic isthmus is complex, and involves various strategies of cardiopulmonary bypass (CPB), cerebral and spinal cord protection. We report on a patient with a giant pseudoaneurysm of the distal arch and proximal descending aorta, in whom cannulation of the femoral artery was unfeasible. Instead, the right axillary artery and the left femoral vein were cannulated. This technique allowed to perform a left anterolateral thoracotomy with the patient already on CPB and hypothermic, and to shorten the duration of hypothermic circulatory arrest.

Abstract.: Isolated noncompaction of the ventricular myocardium is a recently described anomaly. We report the first case of this anomaly presenting as a restrictive cardiomyopathy, and the first association of this entity with endocardial fibrosis.

Anomalous systemic or pulmonary venous connections increase the risk and technical difficulty of the modified Fontan procedure. This report describes an alternative technique of total diversion of systemic venous return to the pulmonary artery in a child with left atrial isomerism, incorporating an extracardiac conduit between the hepatic veins and the right pulmonary artery.

A case of congenital mitral stenosis with pulmonary hypertension is presented. The severity and rapid development of the pulmonary vascular changes are unusual, especially for a young child. The case underscores the importance of early detection of correctable congenital heart disease and emphasizes the unpredictability of the time course and severity of irreversible pulmonary hypertension.