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Ch. 18 The Cardiovascular System: The Heart
Marieb - Human Anatomy & Physiology 7th Edition
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Marieb, Hoehn 7th EditionCh. 18 The Cardiovascular System: The Heart문제 22
17장, 문제 22

Florita Santos, a middle-aged woman, is admitted to the coronary care unit with a diagnosis of left ventricular failure resulting from a myocardial infarction. Her history indicates that she awoke in the middle of the night with severe chest pain. Her skin is pale and cold, and moist sounds are heard over the lower regions of both lungs. Explain how failure of the left ventricle can cause these signs and symptoms.

검증된 단계별 안내
1
Understand the role of the left ventricle: The left ventricle is responsible for pumping oxygenated blood from the lungs into the systemic circulation, supplying the body with oxygen and nutrients.
Recognize what happens in left ventricular failure: When the left ventricle fails, it cannot effectively pump blood out to the body, causing blood to back up into the left atrium and then into the pulmonary veins and lungs.
Explain pulmonary congestion and edema: The increased pressure in the pulmonary circulation causes fluid to leak from the capillaries into the lung tissue and alveoli, leading to moist crackling sounds (rales) heard over the lower lungs and difficulty breathing.
Connect systemic effects: Because less blood is pumped into systemic circulation, tissues receive less oxygen, causing symptoms like pale, cold skin due to vasoconstriction and reduced peripheral perfusion.
Relate chest pain and myocardial infarction: The initial myocardial infarction damaged the heart muscle, impairing left ventricular function and triggering the cascade of symptoms described.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Left Ventricular Failure

Left ventricular failure occurs when the left ventricle cannot pump blood effectively, leading to reduced cardiac output. This causes blood to back up into the lungs, increasing pressure in pulmonary vessels and impairing oxygen exchange, which results in symptoms like shortness of breath and fluid accumulation.
추천 영상:
01:59
Introduction to Homeostasis

Pulmonary Congestion and Edema

When the left ventricle fails, blood accumulates in the pulmonary circulation, causing fluid to leak into lung tissues and air spaces. This pulmonary edema produces moist crackles on auscultation and contributes to respiratory distress, as seen in the moist lung sounds and difficulty breathing.
추천 영상:
3:49
Pressure in the Lungs and Pleural Cavity Example 1

Signs of Poor Perfusion in Heart Failure

Reduced cardiac output from left ventricular failure leads to inadequate blood flow to tissues, causing pale, cold, and clammy skin due to vasoconstriction and sympathetic activation. These signs reflect the body's attempt to maintain vital organ perfusion despite heart dysfunction.
추천 영상:
4:08
Electrical Conduction System of the Heart Example 3
관련 실천
교과서 질문

Discuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.

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교과서 질문

Name the elements of the intrinsic conduction system of the heart in order, beginning with the pacemaker

What is the important function of this conduction system?

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교과서 질문

You have been called upon to demonstrate the technique for listening to valve sounds.

Explain where you would position your stethoscope to auscultate.

(1) the aortic valve of a patient with severe aortic valve insufficiency and

(2) a stenotic mitral valve.

During which period(s) would you hear these abnormal valve sounds most clearly? (During atrial diastole, ventricular systole, ventricular diastole, or atrial systole?)

What cues would you use to differentiate between an insufficient and a stenotic valve?

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