The effects of digitoxin upon the twelve lead electrocardiogram

Relation between serum digoxin concentration and the electrocardiogram

“…Criteria for inclusion were: (1) no change in digoxin dosage for at least 7 days; (2) serum digoxin concentration measurement prior to the intake of the regular digitalis dose; (3) registration of an electrocardiogram within 6 h of the serum digoxin concentration measurement; (4) absence of conditions whose effects on the electrocardiogram could potentially mask those of digitalis (Table I): the serum potassium level (normal range 3.5-5.0 mmol/l) and the serum calcium level (normal range 2.2-2.7 mmol/l) were measured in every patient. Exclusion criteria for patients with ischemic heart disease were unstable angina, previous myocardial infaiction, and previous heart surgery; however, ischemic heart disease was not actively looked for and several patients may have had some degree of (clinically stable) ischemic heart disease.…”

False "Coronary Patterns" in the Infant Electrocardiogram

“…A left aortic arch was seen to originate from the left ventricle, and a tiny pulmonary artery appeared to communicate with the right ventricle. The [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] showed an unchanged sinus rate and P-R interval. The precordial leads revealed prominent R waves with an upright T wave in the right precordial leads and predominant S waves in the left, suggesting right ventricular hypertrophy.…”

Electrocardiographic Diagnosis of Left Ventricular Enlargement: Results of a Survey

“…This is understandable in view of the nature of electrocardiographic alterations, of which the causes are legion. For example, 3 of the replies specifically referred to the absence of digitalis administration, since this form of therapy is a frequent source of confusion (10).…”