The effects of exercise and smoking on the electrocardiograms and ballistocardiograms of normal subjects and patients with coronary artery disease

Exercise Performance and Electrocardiographic Changes in Indices of Effect of Long-acting Nitrates in Angina Pectoris

“…ST-changes are recorded in 50-60% of patients with a definite history of angina pectoris and with normal resting electrocardiograms after a standard exercise test (Davis et al, 1953 ;Gazes et al, 1964). In the present study, where all post-exercise recordings were obtained during precordial pain, STV.5 changes occurred in seven out of 18 patients, whereas nine patients showed ST-changes when all leads were taken into account.…”

Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography

“…Patients with coronary vessel disease may present resembling deformations in the ballistocardiogram after smoking [78]. …”

Clinical Diagnosis of Atherosclerosis of the Coronary Arteries*

“…Any other type of record cannot be said to have real significance from the diagnostic standpoint at this time, and the two significant types are from persons who constitute a small proportion of the total population. More definitive results have been found in records of the ballistocardiographic reaction to smoking in patients with coronary disease (7). Newer means of recording the underlying force of cardiac ejection are being developed, and long‐term follow‐up studies are being carried out to determine whether the apparently normal persons with abnormal ballistocardiograms do indeed have subclinical coronary disease, as Starr's earlier results suggest.…”

“…The electrocardiogram may be diagnostic of coronary insufficiency when the record is taken during a spontaneous episode of angina pectoris or when myocardial anoxia is brought about by one of the several types of stress tests (6). Davis et al (7) have shown that such tests may fail to give positive results in 50 per cent of patients with known coronary atherosclerosis, and may give falsely positive results in 22 per cent of perfectly healthy normal controls. If the criteria for positive findings are made more stringent, so as to eliminate positive results in the normal controls, many diagnoses of coronary disease are likewise eliminated.…”