During pregnancy, cardiovascular and respiratory changes occur to support the developing fetus. Plasma volume increases up to 45% by the third trimester to support increased blood flow demands. The heart increases in size, with ventricular mass and end diastolic volume rising to pump more blood. Respiratory changes include increased oxygen consumption and a decline in lung capacity due to uterine enlargement. These modifications allow oxygen and nutrients to be delivered to the growing placenta and fetus but can put stress on maternal organs. Careful monitoring is needed to detect any pathological conditions arising from the physiological strain of pregnancy.

1. CARDIOVASCULAR & RESPIRATORY CHANGES IN
PREGNANCY
Presented by: Maj Akanksha Tevatia
Moderated by : Col Bidhan Roy

2. PARAMETER 1ST TRIMESTER 2ND TRIMESTER 3RD TRIMESTER
PLASMA VOLUME From 6-8wks Max at 32 wks – 4700 to 5200ml; 45%
RED BLOOD CELL
MASS
Increases by 250-450 ml; 20 – 30% by term
Reflects increased production than prolongation of red blood cell life
Anatomical Changes:
VENTRICULAR MASS Increases --- ---
EDV --- Increases
CARDIAC COMPLIANCE
LEFT ATRIAL DIAMETER
Increases

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SIGNIFICANCE
 ? Pathological cardiomegaly

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