Hypertension in CKD Pregnancy: a Question of Cause and Effect (Cause or Effect? This Is the Question)

Area of Science:

• Nephrology
• Obstetrics
• Cardiology

Background:

• Chronic kidney disease (CKD) affects approximately 3% of pregnancies.
• Hypertension complicates 5-8% of pregnancies, with concomitant CKD and hypertension prevalence unknown.
• Both CKD and hypertension independently increase risks for adverse pregnancy outcomes.

Purpose of the Study:

• To review the challenges and management strategies for hypertension in pregnancies complicated by chronic kidney disease.
• To highlight the diagnostic importance of differentiating CKD-related hypertension from pregnancy-induced conditions.
• To discuss current uncertainties regarding optimal blood pressure targets and pharmacological interventions.

Main Methods:

• Literature review and synthesis of existing data on CKD, hypertension, and pregnancy outcomes.
• Analysis of risk factors and their potential multiplicative effects on adverse outcomes.
• Discussion of diagnostic tools, including utero-placental flows, fetal growth assessment, and serum biomarkers.

Main Results:

• Combined risks of CKD, hypertension, and proteinuria likely multiply adverse outcomes, at least doubling rates of preterm birth and small for gestational age infants.
• Differential diagnosis is crucial for effective clinical management.
• Optimal blood pressure goals and the roles of specific antihypertensives, diuretics, and erythropoiesis-stimulating agents (ESAs) remain to be established.

Conclusions:

• Hypertension in CKD pregnancies presents significant risks requiring careful management.
• A tailored approach to blood pressure control, emphasizing monitoring, is recommended in the absence of definitive guidelines.
• Further research is essential to clarify optimal therapeutic strategies for this high-risk obstetric population.