Tenuous link between ischaemic threshold and both ambulatory ischaemia and symptom status over time in stable angina: a 5-year follow-up study

• Published in: International journal of cardiology 1996-07, Vol.55 (1), p.61-65
• Main Authors: Knight, Charles J., Mulcahy, David, Gunning, Mark, Patel, Deven J., Wright, Christine, Clarke, Debbie, Sutton, George, Fox, Kim
• Format: Article
• Language: English
• Subjects: Adult; Aged; Ambulatory monitoring; Angina pectoris; Angina Pectoris - physiopathology; Biological and medical sciences; Cardiology. Vascular system; Coronary heart disease; Disease Progression; Electrocardiography, Ambulatory; Exercise Test; Female; Follow-Up Studies; Heart; Heart Rate; Humans; Ischaemic threshold; Male; Medical sciences; Middle Aged; Retrospective Studies
• ISSN: 0167-5273; 1874-1754
• DOI: 10.1016/0167-5273(96)02628-9

This study evaluates changes in ischaemic threshold over a 5-year period in patients with stable angina pectoris, who did not suffer any intervening cardiac event. Changes in ischaemic threshold are related to alterations in symptomatic status and ambulatory ischaemia. Over long-term follow-up, there is a significant fall in ischaemic threshold in such patients (mean heart rate at onset of ischaemia fell from 104 ± 17.8 to 97 ± 17.4 bpm: P < 0.001), but this is not matched by a worsening of either symptoms or ischaemia during daily life. In the 68% of patients that had a reduction in ischaemic threshold of ≥ 5-bpm, 68% had either definite reduction or no change in symptoms and 84% had either reduction, abolition or no change in transient ischaemic activity. The dissociation between ischaemic threshold, ambulatory ischaemia and symptoms has implications for the long-term monitoring and management of the patient with stable angina.