Table 3.

The ZAHARA risk score.¹²

Predictors	Points
1. History of arrhythmias	1.50
2. Cardiac medication before pregnancy	1.50
3. New York Heart Association class prior to pregnancy ≥ II	0.75
4. Left heart obstruction (peak gradient  > 50 mmHg or aortic valve area <1.0 cm2)	2.50
5. Systemic atrioventricular valve regurgitation (moderate/severe)	0.75
6. Pulmonary atrioventricular valve regurgitation (moderate/severe)	0.75
7. Mechanical valve prosthesis	4.25
8. Cyanotic heart disease (corrected/ uncorrected)	1.00
Total number of points: 0–13 points
Risk score	Frequency of maternal cardiac complication (%)
0–0.50	2.9
0.51–1.50	7.5
1.51–2.50	17.5
2.51–3.50	43.1
>3.51	70.0