Patient characteristics | |
Number of patients recruited | 111 (13 withdrew) |
Number of patients not recruited due to poor quality of ECG recordings or diary documentation | 4 |
Male | 87 (78.4 %) |
Mean age (SD) | 68.1 years (8.0) |
Recruited with prognostically significant coronary disease found at cardiac catheterisation | 38 (34.2 %) |
Recruited after acute coronary syndrome | 73 (65.8 %) |
Mean follow-up period between first and last heart rate recording (SD) | 445.6 days (204.6) |
Prescribed a negative chronotropic drug at start of study | 92 (82.9 %) |
Mean resting supine heart rate at start of study (SD) | 58.4 bpm (9.4) |
Number of patients with ECG recordings | |
Unsupervised 300-m walk | 111 (100 %) |
Unsupervised flight of stairs | 82 (73.9 %) |
Angina | 43 (38.7 %) |
Number of diary-documented events | |
Unsupervised 300-m walk (percentage of expected) | 6705 (85.4 %) |
Unsupervised flight of stairs (percentage of expected) | 4082 (74.2 %) |
Angina | 591 |
Interpretable ECGs for diary-documented events | |
Unsupervised 300-m walka | 5144 (76.7 %) |
Unsupervised flight of stairsa | 3423 (83.9 %) |
Angina | 383 (64.8 %) |
Supervised 300-m walka | 688 |
Supervised flight of stairsa | 685 |
ECG quality (interpretable ECGs) | |
ECGs with two heart rate measurements | 96.5 % |
Heart rate calculations based on five consecutive R waves | 93.4 % |
Mean start of first heart rate calculation (SD) | 2.0 s (3.8) |
Mean start of second heart rate calculation (SD) | 25.2 s (4.2) |
Mean difference in heart rate between the beginning and end of 30-s ECGs | |
Rest ECG for unsupervised 300-m walk (SD) | −0.8 bpm (4.0) |
Postexertional unsupervised stairs (SD) | −2.0 bpm (5.7) |
Postexertional unsupervised 300-m walk (SD) | −4.1 bpm (5.0) |
Angina (SD) | −2.0 bpm (5.4) |
Clinical events during follow-up | |
ST elevation myocardial infarction | 0 |
Non-ST elevation myocardial infarction (number of patients) | 2 (2) |
Unstable angina (number of patients) | 6 (5) |
Coronary death diagnosed postmortem | 1 |