A long-term electrode system suitable for ecg and impedance pneumography

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i g a t o r s as well as c l i n i c i a n s .The d-c p o t e n t i a l cause baseline d r i f t and blocking of amplif'iers have caused considerable annoyance.The electrode described i n t h i c paper i s a modification of t h e NASA Manned Spacecraft Center (MSC) Mercury ECG .f l i g h t electrode.A t t h e inception of the Project Mercury program, a decision was made t o telemeter two electrocardiogram leads, one channel of r e s p i r a t i o n and one channel of body temperature.I n later f l i g h t s , two additional e l e c t r o d e s were used i n order t o obtain' 1 a b e t t e r measure of r e s p i r a t i o n by means 01' a n impedance pneumograph.The present electrode system was evolT-ed as a r e s u l t of skin i r r i t a t i o n after long and repeated usage of electrodes as w e l l as noise caused by t h e electrode6 while t h e y were being used on act'ive subjects.Data have been c o l l e c t e d on long-term application of these e l e c t r o d e s f o r periods o

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