A statistical study was done on arrhythmias in 13,958 tracings from 12,425 patients subjected to electrocardiographic examinations at National Medical Center from July 1973 to June 1977, and the results were as follows;
1) The number of patients subjected to electrocardiographic examinations was 12,425-composed of 5,833 males(46, 95%) and 6,592 females(53. 05 %), and the age distribution in male patients was somewhat higher in 5th(19.41%) and 6th decades (20.02%), but in female patients higher in 3rd (19.46%), 4th (19.14%), 5th (19.58%) and 6th (17.23%) decades. But in female patients, the distribution was rather even.
2) The 1,856 cases of arrhythmias were composed of 893 males(48.12%) and 963 females(51.89 %), showed no significant difference in sexual incidence´ and accounted for 14. 94%. of total subjects examined.
3) Among the 1,856 cases with arrhythmias, which were composed of 1,350 cases of the disturbances in impulse formation and of 506 cases of the disturbances in impulse in impulse conduction, the commonest arrhythmia was 502 atrial fibrillations(4.04%), and the next most common ones were 423 sinus irregularities(3.40%) 294 premature beats(2.45%), and 220 bundle branch´ blocks(1.77%); accounting for 27. 05%, 22.79%, 16.20%, and 11.85% of total arrhythmias, respectively. The rarer arrhythmias, below 5 cases in the number of certain arrhythmia, were idioventricular rhythm, ventricular paroxysmal tachycardia, sino-atrial Block, 3rd degree A-V block, bilateral BBB, and artificial pacemaker-induced rhythm; accounting for 1.24% of total arrhythmias altogether.
4) The highest age incidence of arrhythmia was found in 6th decade, and the order of incidence was followed by the 5th, the 7th, and the 4th.decade; and in all the specific arrhythmias except sinus irregularities, the first degree A-V Block, and IRBBB, (Incomplete right bundle branch block),the older age groups revealed the tendency to have more frequent arrhythmias in incidence..
5) The incidence of Sino-Atrial Blocks and all bundle branch blocks but IRBBB, was more frequent in male than in female; but, the incidence, of sinus irregularities, Supraventricular Paroxysmal Tachycardia, Atrial Flutter & Atrial Flutter Fibrillation wasmore frequent in female than in male. The incidences of the´ remainders wererather similar in both sexes.
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