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Cardiac output increases throughout early pregnancy, and peaks in the third trimester, usually to 30-50% above baseline. [6] Estrogen mediates this rise in cardiac output by increasing the pre-load and stroke volume, mainly via a higher overall blood volume (which increases by 40–50%). [22] The heart rate increases, but generally not above ...
Hyperdynamic circulation is abnormally increased circulatory volume. Systemic vasodilation and the associated decrease in peripheral vascular resistance results in decreased pulmonary capillary wedge pressure and decreased blood pressure, presenting usually with a collapsing pulse, but sometimes a bounding pulse.
Major factors influencing cardiac output – heart rate and stroke volume, both of which are variable. [1]In cardiac physiology, cardiac output (CO), also known as heart output and often denoted by the symbols , ˙, or ˙, [2] is the volumetric flow rate of the heart's pumping output: that is, the volume of blood being pumped by a single ventricle of the heart, per unit time (usually measured ...
It corresponds to 17% of the combined cardiac output of the fetus at 10 weeks, and 33% at 20 weeks of gestation. [18] Endothelin and prostanoids cause vasoconstriction in placental arteries, while nitric oxide causes vasodilation. [18] On the other hand, there is no neural vascular regulation, and catecholamines have only little effect. [18]
Edema of the lower extremities (peripheral edema), caused by an increase in the venous blood pressure. Tachycardia. This is caused by the decreased preload and subsequent decreased cardiac output, and leads to a compensatory heart rate increase. In pregnant women, signs of fetal hypoxia and distress may be seen in the cardiotocography.
[9] The CDC recommends that during pregnancy, the pregnant women should exercise 150 minutes each week specifically focusing on aerobic activity at a moderate intensity. [10] The acute physiological responses include an increase in cardiac output (CO) of the individual (increased heart rate and stroke volume).
Symptoms usually include one or more of the following: orthopnea (difficulty breathing while lying flat), dyspnea (shortness of breath) on exertion, pitting edema (swelling), cough, frequent night-time urination, excessive weight gain during the last month of pregnancy (1-2+ kg/week; two to four or more pounds per week), palpitations (sensation of racing heart-rate, skipping beats, long pauses ...
Cardiac arrest occurs during pregnancy; Patient is not revived by basic and advanced life support (e.g. CPR and defibrillation) techniques; The uterus is large enough to cause aortocaval compression; The third condition is met when palpation finds the top of the uterus level with the navel.