The normal right chest electrocardiogram

Right chest leads, V3R-V7R were recorded in 109 persons (40 women, 69 men, mean age 41 years) without evidence of heart disease. An rS or rSr' configuration was found in V3R in 98% and in V4R in 91%. Secondary r waves increased in amplitude and frequency in lateral leads and were found in V7R in 65%. The r or r' waves did not exceed 5 mm in amplitude in any lead. A qS configuration was found most frequently in V6R (16%) but none had qS configuration in all leads. An r/s ratio greater than one was found in eight persons, but the ratio never exceeded 1.5. Measurements of r and S wave amplitudes and ST-segment deviations in V4R in a 45 degree sitting position including deep inspiration and expiration did not change the amplitudes significantly. Normal values for QRS-amplitudes and q-duration, J-point and ST-segment measured 40 msec and 80 msec after the last QRS-deflection are presented.