Systemic Vascular Resistance

Also written as SVR.

Systemic vascular resistance falls in pregnancy because of progesterone-mediated vasodilatation.

What our notes say

Systemic vascular resistance falls in pregnancy because of progesterone-mediated vasodilatation. (Reproductive Health 1 End of Trimester CAT: 40 MCQs and 4 short answers)
Squatting in older children (to raise the systemic vascular resistance and increase pulmonary flow), and poor exercise tolerance. (Paediatrics end of 3rd trimester exam (MBPE 4300): 11 January 2022, congenital h)
↑ systemic vascular resistance + ↑ intravascular volume (Hypertension)
ACE inhibitors block conversion of angiotensin‑I to angiotensin‑II, lowering systemic vascular resistance and glomerular filtration pressure. (Hypertension)
Systemic vascular resistance: Falls about 30% (lowest at 20 weeks) — Improves blood flow to the uterus and placenta (Physiological changes in pregnancy)
Vasodilators: If systolic blood pressure remains adequate, start an intravenous nitrate infusion (glyceryl trinitrate) to unload the left ventricle by reducing systemic vascular resistance and pulmonary capillary wedge pressure. (Cardiomyopathies)