MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the blood that flows passively into the ventricles.
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pressure on the AV valves during ventricular contraction.
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an attempt of the atria to contract against closed valves.
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the volume of blood that the atria contract to the ventricles.
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Detailed explanation-1: -The atrial kick contributes a significant volume of blood toward ventricular preload (approximately 20%). At normal heart rates, the atrial contractions are considered essential for adequate ventricular filling.
Detailed explanation-2: -It may be conveniently divided into two phases, lasting a total of 270 ms. At the end of atrial systole and just prior to atrial contraction, the ventricles contain approximately 130 mL blood in a resting adult in a standing position. This volume is known as the end diastolic volume (EDV) or preload.
Detailed explanation-3: -Atrial Systole: At this phase, blood cells flow from atrium to ventricle and at this period, atrium contracts. Isovolumic Contraction: At this stage, ventricles begin to contract. The atrioventricular valves, valve, and pulmonary artery valves close, but there won’t be any transformation in volume.
Detailed explanation-4: -Which statement best describes what is meant by atrial kick? The atria contract during systole and attempt to push against closed valves.