Antiphospholipid Syndrome and Postpartum Pulmonary Artery Pressure

Inclusion Criteria: * Age: \> 16 years. * Consent or waiver of consent according Chapter 9 * Preeclampsia Defined as: • New onset hypertension (blood pressure \>140/90mmHg on multiple occasions after 20 weeks of gestation) In combination with new onset of 1 or more of the following: * Proteinuria (urine protein \>300mg /24h or 2+ or higher in dipstick on multiple occasions) * Platelet count \<100,000/microL, * Serum creatinine \>97.2 micromol/L, * Liver transaminases at least twice the upper limit of the normal concentrations, * Pulmonary edema, * New-onset and persistent headache, * Visual symptoms. -Postnatal follow up at the obstetrical and cardiology clinic, Inselspital Bern, Switzerland. Exclusion Criteria: * Age: \< 16 years * Incomplete or ambiguous data: if data confirming the eligibility criteria or data to analyze the primary endpoint is not fully available or despite efforts assessed as significantly ambiguous, the data set will be excluded from analyses, since no analysis is possible