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Case report An asymptomatic II-year-old boy attended the Cardiac Division of the Navarra Hospital in February I969, for evaluation of an abnormal cardiac shadow. Five years before admission he was studied at another cardiac centre and a diagnosis of infundibular pulmonary stenosis with a systolic gradient of 20 mmHg was verified. On auscultation, a systolic murmur and a split second sound were heard in the pulmonary area. The x-ray examination of the thorax showed an abnormal cardiac shadow (Fig. I).The electrocardiogram revealed normal sinus rhythm. An rS pattern was observed in leads II, III, and aVF with very deep S waves, shifting the mean QRS axis to the left (-6o0) (Fig. 2). A Q wave was present in leads I, VI, V2, and V3 with 1 Address for reprints: Dr. E. de los Arcos, Department of Thoracic and Cardiovascular Surgery, Hospital de Navarra, Pamplona, Spain. S wave in I and all the praecordial leads. A small r' was present in lead V4R. The QRS interval was 0 I3 sec in lead II. The electrocardiographic changes were interpreted as left anterior hemiblock associated with right bundle-branch block.Withdrawal pressure tracings during right cardiac catheterization showed infundibular pulmonary stenosis with a systolic gradient of 8o mmHg. No abnormality was observed during left arterial retrograde cardiac catheterization.Right ventriculotomy under extracorporeal circulation revealed a hydatid cyst IO cm in diameter in the interventricular septum. The cystic adventitia was opened and the cyst was removed.The postoperative electrocardiogram (Fig. 3) showed QRS interval widening to o-I6 sec. The mean QRS axis was not modified but the degree of right bundle-branch block was increased.

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La situación laboral de la mujer en el sector agropecuario en México, en el periodo 2008-2016, ha presentado cambios importantes en relación a su ingreso, nivel de educación, tipo de posición en el trabajo, duración de la jornada laboral, tamaño de la unidad productiva en que participa y las prestaciones sociales que recibe. El objetivo del trabajo consiste en mostrar y analizar las tendencias y magnitudes de estos cambios de acuerdo con la base de datos de INEGI. Mediante un modelo econométrico se pretende probar si el nivel de escolaridad de * Los autores agradecen los comentarios de dos dictaminadores anónimos de Análisis Económico para mejorar este manuscrito. Cualquier error u omisión remanente es responsabilidad exclusiva de los autores.

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