Clinical details
| On entry | On follow up | |||||||
|---|---|---|---|---|---|---|---|---|
| Total | Mean age (years) | Age cohorts (years) | Total | 20–44 cohort | ||||
| 20–44 | 45–64 | 65–79 | ⩾80 | |||||
| *Syncope in 30, presyncope in 11, both in four; †includes one case induced bradycardia; ‡first two readings systolic >160 mm Hg or diastolic>95 mm Hg, heart rate >50 beats/min; §diagnosis on history only, criteria not available16 (five had valvar heart disease); ¶bundle branch block: right 28 (with left anterior hemiblock 6), left 12; **maximum variations including later records; ††variations >120 ms or 10% less than shortest PP interval17; ‡‡not all on entry. | ||||||||
| Reasons for referral | ||||||||
| Disturbed consciousness (class 1) | 42 | 70.5 | 5 | 4 | 20 | 13 | ||
| Possible cardiac symptoms (class 2) | 36 | 68.8 | 2 | 7 | 22 | 5 | ||
| Coincidental (class 3) | 58 | 69.9 | 6 | 0 | 24 | 18 | ||
| Uncoded/unknown | 11 | 62 | 2 | 4 | 4 | 1 | ||
| Total | 147 | 69.3 | 15 | 25 | 70 | 37 | ||
| Sex ratio (men:women) | 1.9:1 | 10:5 | 16:9 | 47:23 | 25:12 | |||
| Data discovered during survey | ||||||||
| Syncope/presyncope* | 45 | 71.8 | 3 | 6 | 24 | 12 | 16 | 3 |
| Bradycardia induced dizziness/confusion | 15 | 68.6 | 1 | 3 | 10 | 1 | 4 | 0 |
| Bradycardia induced dyspnoea | 11 | 75.1 | 0 | 0 | 10 | 1 | 9 | 0 |
| Angina of effort† | 18 | 72.3 | 0 | 3 | 11 | 4 | 17 | 1 |
| Hypertension‡ | 23 | 76 | 0 | 2 | 16 | 5 | ||
| Myocardial infarction | 21 | 72.7 | 0 | 4 | 11 | 6 | 6 | 0 |
| Valvar or congenital heart disease | 16 | 63.5 | 2 | 7 | 6 | 1 | 6 | 0 |
| Cardiac failure | 7 | 78.8 | 1 | 0 | 3 | 3 | 20 | 1 |
| Rheumatic fever§ | 19 | 68.1 | 2 | 4 | 10 | 3 | 0 | 0 |
| Organic heart disease | 64 | 71.2 | 2 | 13 | 37 | 12 | ||
| Mobitz I on standard or ambulatory ECG | 112 | 71.6 | 8 | 15 | 57 | 32 | ||
| Mobitz I initially on ambulatory ECG only | 35 | 62 | 7 | 10 | 13 | 5 | ||
| Bundle branch block¶ | 40 | 73.6 | 2 | 5 | 20 | 12 | 7 | 0 |
| 2:1 Block | 34 | 72.9 | 2 | 4 | 20 | 7 | 22 | 2 |
| Advanced block | 3 | 66.3 | 0 | 1 | 2 | 0 | 9 | 1 |
| PP interval varies ⩽60 ms with Mobitz I** | 81 | 73.7 | 2 | 13 | 43 | 23 | ||
| 60 ms < PP interval < 120 ms with Mobitz I** | 12 | 67.8 | 2 | 1 | 5 | 4 | ||
| Sinus arrhythmia with Mobitz I**†† | 25 | 53.8 | 9 | 8 | 4 | 4 | ||
| Mobitz I during bradycardia** | 30 | 56.4 | 10 | 7 | 9 | 4 | ||
| His high block/prolonged AH interval‡‡ | 14 | 57.1 | 4 | 3 | 7 | 0 | ||