Oculocardiac reflex

The Okulokardiale reflex ( " Eye Heart Reflex" ) occurs when pressure is applied to the eyeball ( eyeball ) or train to the eye muscles. The organism reacts with a decrease in heart rate ( bradycardia) and blood pressure (hypotension ) as well as deep breathing and nausea. This can result in eye surgeries lead to incidents.

Nomenclature

The okulokardiale reflex was also known as Aschner - Bulbusdruckversuch, Aschner - Bulbusreflex, Aschner reflex - okulokardialer, Aschner phenomenon, Aschner reflex - Dagnini, Aschner 's phenomenon, Aschner 's test. The reflex phenomenon was described almost simultaneously by Aschner and Dagnini. A few months ago Aschners message Dagnini published on 17 June 1908, the observed on two comatose patients reflex phenomenon, and interpreted it as an influence of peripheral vagal stimulation. In October 1908, regardless of which followed Aschners publication on the same topic. Aschner had seen the Bulbusdruckversuch first time in a lecture by Wagner Jauregg and explained to him by experimental means. The inevitable question of the priority of the describer of this phenomenon for some time dominated the scientific discussion.

Bulbusdruckversuch

The okulokardiale reflex results in pressure on the eyeball ( up to the pain sensation), especially for reflex bradycardia, hypotension, depression of respiration and induction of nausea. First, an increase in intracranial pressure on the way of the optic nerve sheaths was suspected as the cause, but then provided the nervous reflex character in animal experiments.

The Bulbusdruckversuch used for the detection of vegetative lability ( vagal tone ), but it can also be used therapeutically to interrupt paroxysmal tachycardias. The experiment can be performed in different ways:

• Finger pressure and circulation of weights, from 5 to 10 minutes andauerndem pressure on the eyeball, which should not exceed a weight load of 100-150 g.
• Printing tests with one-minute breaks of 2 to 3 seconds.

Both types of tests should be able to cause any damage to the retina. The okulokardiale reflex is triggered more often than 50 -year-olds.

Ocular weight load for experimental purposes is at normal intraocular pressure (15 mmHg ) and a Brachialisdruck of 120/80 mmHg and 105 g with normal intraocular pressure with arterial hypertension of 180/110 mmHg 238 g