Influence of Sympathetic Nerve Stimulation on Ventricular Function in the Newborn Lamb

Influence of sympathetic nerve stimulation on ventricular function in the newborn lamb.

Cardiac responses to supramaximal electrical stimulation of postganglionic sympathetic nerve fibers were studied in 17 lambs, 10 hours to 3 days of age. In all lambs left ventricular contractility increased within 3 seconds and was unaltered by atropine, ganglionic blockade, or nerve sectioning proximal to the stimulating electrodes but was abolished by beta-receptor blockade. The responses wer...

Influence of sympathetic nerve stimulation on right ventricular outflow-tract pressures in anesthetized dogs.

Stellate ganglion stimulation in the anesthetized, open-chest dog consistently resulted in the generation of pressure differences which averaged 20 mm Hg across the infundibular region of the right ventricle. Before stimulation, peak systolic pressures in the sinus and conus were closely matched. Peak sinus pressure showed ah average increase of 184 and 162% during stimulation of the left and r...

the influence of the neo-platonic concept of poetic imagination on wordsworth’s poetry

بر اساس نظریه افلاطون در باره شعر خلاقیت هنری مورد انتقاد قرار گرفته است. نظریه کلی در مورد شعر این بود که شعر از ظواهرتقلید میکند و نه حقیقت. چون سایه ای از حقیقت است. اما با پیدایش فلسفه نو افلاطونی، انتقاتات قبلی در مورد شعر و شاعری اصلاح شد. فلوطین در کتاب انئید، اساس خلق هنری را بر محور مُثل افلاطونی قرار داد. وی باور داشت که هنر مندان در خلق آثار هنری، تحت تاثیر مُثل افلاطونی بوده و عوالمی ...

Regulation of ventricular contraction. Influence of cardiac sympathetic and vagal nerve stimulation on atrial and ventricular dynamics.

Influences of hypercapnia on cardiac function in the newborn lamb.

There is an abundance of evidence which suggests that hypercapnia impairs the performance of isolated heart-lung preparations, and that this is primarily consequent to diminished contractility of the myocardium.'7 Patterson' showed that the cardiac depressant effect of CO2 could be prevented largely by the addition of epinephrine. In intact adult dogs acidosis produced by CO2 retention causes s...