Stage of MS* | Source of data | Total number of pregnancies | Maternal outcomes | Fetal outcomes | ||||
Death | Pulmonary edema or heart failure | New/recurrent arrhythmias | Stillbirth | Neonatal death | Preterm birth | |||
Progressive (MVA >1.5 cm2) | 3 studies¶[1-3] | 118 | 0% | 18% | 3% | 1% | 0% | 8% |
Severe (MVA 1.0 to 1.5 cm2) | Systematic review of 8 studies[4] | 287 | 1% (95% CI 0-2%) | 18% (95% CI 2-33%) | 5% (95% CI 1-9%) | 2% (95% CI 1-4%) | 0% | 10% (95% CI 2-17%) |
Very severe (MVA <1.0 cm2) | 174 | 3% (95% CI 0-6%) | 37% (95% CI 23-51%) | 16% (95% CI 1-25%) | 4% (95% CI 1-7%) | 2% (95% CI 0-4%) | 18% (95% CI 7-29%) |
MS: mitral stenosis; MVA: mitral valve area.
* The stages of MS in this table were revised to reflect those in the 2020 American College of Cardiology/American Heart Association (ACC/AHA) guidelines for valvular heart disease.[5] The names of these stages differ from those originally used in the cited studies.
¶ These 3 studies were also included in the systematic review.