Which statement is true regarding myocardial functioning in the normal heart, based upon the Frank Starling law?

An increase in afterload results in decreased systolic pressure, which creates a decreased cardiac output.

A decrease in afterload causes the cardiac muscles to hypertrophy, resulting in increased diastolic volume.

An increase in preload results in greater shortening of myocardial fibers, thereby increasing contractility.

A decrease in preload results in increasing diastolic muscle fiber length, which impedes contractility.

Answer and Explanation

The Correct Answer is C

A) An increase in afterload results in decreased systolic pressure, which creates a decreased cardiac output:

This statement is not consistent with the Frank-Starling law. Afterload refers to the resistance against which the heart must pump blood during systole. An increase in afterload typically results in increased systolic pressure, not decreased, as the heart works harder to overcome the increased resistance. However, increased afterload can lead to decreased cardiac output due to the increased work of the heart.

B) A decrease in afterload causes the cardiac muscles to hypertrophy, resulting in increased diastolic volume:

This statement is not consistent with the Frank-Starling law. Afterload refers to the pressure or resistance against which the heart must pump blood during systole. A decrease in afterload typically reduces the workload on the heart, which may lead to reverse remodeling and a reduction in cardiac hypertrophy. Increased diastolic volume may occur due to reduced afterload, but it's not the direct result of hypertrophy.

C) An increase in preload results in greater shortening of myocardial fibers, thereby increasing contractility:

Correct. According to the Frank-Starling law, an increase in preload (end-diastolic volume or stretch of myocardial fibers) leads to greater overlap of actin and myosin filaments within myocardial fibers during systole. This increased overlap results in stronger myocardial contraction (increased contractility), leading to an increased stroke volume and cardiac output.

D) A decrease in preload results in increasing diastolic muscle fiber length, which impedes contractility:

This statement is not consistent with the Frank-Starling law. Preload refers to the degree of stretch of the myocardial fibers at the end of diastole. A decrease in preload would lead to decreased stretch of the myocardial fibers, not increasing diastolic muscle fiber length. Decreased preload typically results in decreased contractility rather than impediment to contractility due to reduced myocardial stretch.

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Correct Answer is A

Explanation

A) Blockage of retinal capillaries causing ischemic damage of the central macular area:

Correct. Blurry central vision that worsens over time can be indicative of macular ischemia, often caused by blockage of retinal capillaries leading to ischemic damage of the central macular area. This condition can occur in diseases such as diabetic retinopathy or retinal vein occlusion.

B) Opaque spoke-like lines developing in the periphery of the lens to the center:

This description is more characteristic of cataracts, which cause visual disturbances such as glare or halos around lights rather than blurry central vision.

C) Tears in the retina that detach from the lining of the posterior eyeball:

Retinal tears and subsequent detachment can cause visual disturbances, but they typically present as sudden onset of floaters, flashes of light, and a curtain-like shadow over the visual field rather than blurry central vision.

D) An increase in intraocular pressure with loss of peripheral vision:

This description is indicative of glaucoma, which can lead to loss of peripheral vision (visual field defects) rather than blurry central vision. Glaucoma-related visual field loss usually begins peripherally and progresses inward, affecting central vision in later stages.

A. Gastric carcinoma. B. Hypokalemia. C. Kidney stones. D. Celiac disease.

Correct Answer is A

Explanation

A. Gastric carcinoma:

Helicobacter pylori infection is a known risk factor for the development of gastric carcinoma, or stomach cancer. Long-term follow-up is essential for clients treated for gastric ulcers caused by H. pylori infection to monitor for any signs or symptoms of gastric malignancy, such as persistent abdominal pain, unexplained weight loss, dysphagia, or gastrointestinal bleeding. Regular surveillance with endoscopic examinations may be recommended to detect any precancerous or cancerous changes in the gastric mucosa.

B. Hypokalemia:

Hypokalemia, or low potassium levels, is not directly associated with gastric ulcers caused by H. pylori infection. While certain medications used in the treatment of gastric ulcers, such as proton pump inhibitors (PPIs) or H2-receptor antagonists, may increase the risk of hypokalemia, it is not a long-term complication specifically related to H. pylori infection.

C. Kidney stones:

Kidney stones, or nephrolithiasis, are not directly associated with gastric ulcers caused by H. pylori infection. Kidney stones typically form in the kidneys and urinary tract due to factors such as dehydration, dietary factors, or metabolic disorders. While certain conditions, such as chronic kidney disease, may be associated with gastric ulcers, kidney stones are not a typical long-term complication.

D. Celiac disease:

Celiac disease is an autoimmune disorder characterized by an abnormal immune response to gluten, a protein found in wheat, barley, and rye. It is not directly associated with gastric ulcers caused by H. pylori infection. Celiac disease primarily affects the small intestine, leading to inflammation and damage to the intestinal lining in response to gluten ingestion. While individuals with celiac disease may experience gastrointestinal symptoms, they are not at increased risk for gastric ulcers specifically related to H. pylori infection.

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Which statement is true regarding myocardial functioning in the normal heart, based upon the Frank Starling law?

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