Imposing of electrodes

Before imposing of electrodes the skin of the patient in places of contact is desirable for degreasing spirit.

Position of electrode	Color	Designation of an electrode
right hand	Red	R
left hand	Yellow	L
right leg	Black	N
left leg	Green	F

As the current-carrying environment between electrodes and a skin of the patient it is necessary to apply electrode gels or pastes; use of the gauze linings moistened by physiological or a hypertonic solution or, as a last resort, by water is supposed.

Electrodes are imposed on extremities of the patient in conformity with the table 1.

On a thorax electrodes are imposed according to table 2.

Tap	Position of electrode	Designation of an electrode
V1	In the fourth intercostals to the right of a sternum	C1
V2	In the fourth intercostals to the left of a sternum	C2
V3	On the fifth edge	C3
V4	In the fifth intercostals on left clavicular lines	C4
V5	At a level on a forward axillary line	C5
V6	At a level on an average axillary line	C6

Electrocardiograph provides registration of an electrocardiogram in various modes - automatic (synchronous registration of all of 12 assignments, preservation of an electrocardiogram in memory of the device, a press their groups on 3 assignments) or monitor (registration of an electrocardiogram in any chosen group of assignments without preservation in memory).

The device, a principle of work of electroencephalograph. Basic rhythms of eeg. Registration of eeg and principles of the analysis

Introduction

Method of registration of biological activity of a brain by means of record of biopotentials is called electroencephalography, corresponding devices is called electroencephalograph. Graph of dependence biopotentials upon time is called encephalogram (EEG). Electroencephalography gave chance of qualitative and quantitative analysis of a functional condition of a brain and its reactions at action of irritant.

Character EEG is defined by a functional condition of a nervous tissue, a level of exchange processes proceeding in it. Infringement of blood supply, hypoxia or a deep narcosis lead to suppression of bioelectric activity of a cortex of cerebrum. Dependence EEG upon the general condition of an organism widely is used in clinic. Method of EEG of research of a brain is the most perspective modern method. EEG has the features, has spontaneous, independent character. Regular electric activity of a brain can be fixed already at a foetus (i.e. till a birth of an organism) and stops only with approach of death. Even at deep coma and a narcosis the characteristic picture of brain waves is observed.

Character of bioelectric activity depends upon receipt of a nervous pulsation on specific channels from touch system, and also from subcortical formations (reticular formations of a trunk of a brain and thalamus).

Electroencephalography is used for revealing volumetric, inflammatory and vascular processes of a brain, specification of localization of the pathological centers, for diagnostic of pathologies of nervous system: traumas and a heart attack of a brain, infringement of a dream, mental frustration. Record EEG is widely applied in diagnostic and medical work (it is especially frequent at epilepsy). EEG is applied in anesthesiology, at studying activity of the brain connected with realization of following functions: perception, memory, adaptation.

Electroencephalography is applied for determination areas of a tumor of a brain, to an estimation of a functional condition of a brain before introduction of a medical product.

EEG reflects integrated activity of huge number neurons of brain cortex and distribution of waves of excitation to neural networks.

The analysis of electroencephalogram is complex and demands participation of neurophysiologist, possessing the practical experience, owning and neurological semiotics.

To expand opportunities of electroencephalography, computer processing of electroencephalogram helps.