Clinical characteristics of women with positive fetal cardiac activity following digoxin administration
| Case | Gestational age (weeks) | Digoxin dose (mg) | Time between digoxin and US detection of cardiac activity (hours) | Cardiac activity after repeat dose of digoxin |
| 1 | 24 | 1 | 24 | Negative |
| 2 | 24.6 | 1 | 24 | Negative |
| 3 | 21.4 | 1 | 48 | Negative |
| 4 | 27 | 1 | 48 | Positive |
| 5 | 25 | 1 | 48 | Positive |
US, ultrasound.