[Antiplatelet antibodies in patients with acute myocardial infarct]. / Anticuerpos antiplaquetarios en pacientes con infarto agudo del miocardio.

Seventy-seven patients with myocaridal infarction and ten normal individuals were studied in order to establish the presence of serous antibodies against platelets. With the complement fixation test antibodies were found in 6.4% of the patients and in none of the normal individuals. Leukoaglutinating and lymphocytotoxic antibodies were detected in 3.8% and 1.2% of the patients, respectively. No anti-platelet antibodies were found by immunoelectrophoresis or by double microimmunodiffusion neither in patients nor in normals. Rabbits immunized with human platelets had up to four antigen-antibody systems as shown by immunoelectrophoresis and double microimmunodiffusion. These rabbit sera were anticomplementary and thus they could not be tested by complement fixation test nor by lymphocytotoxicity. The data obtained suggest that circulating antiplatelets antibodies are rare and thus the possibility of their contributing further damage during myocardial infarction is also low. The alternatives to explain the low frequency of antiplatelet antibodies in patients with myocardial infarction are discussed.

[High frequency electrocardiography. Study of childhood ventricular repolarization in function of the depolarization process]. / Electrocardiografía de alta frecuencia. Estudio de la repolarización ventricular infantil en función del proceso de despolarización.

On an experimental basis the authors studied the process of repolarization and depolarization in high frequency electrocardiograms of 30 healthy children. The negativity of the T wave in V1 and V2 corresponds with the repolarization of the left ventricle and the positivity with that of the right ventricle. The vectors of repolarization of both ventricles were identified and found to be situated on a horizontal plane. In all tracings the electrical systole of the right ventricle was found to be greater than that of the left ventricle. The number of components of high frequency tracings in the intrinsecoid deflexion was greater on the right ventricle. The authors suggest that the high frequency electrocardiogram is a valuable procedure in clinical investigation.