A mechanical bowel obstruction may lead to which life-threatening condition if not treated?
Cancer.
Ulcerative colitis.
Peritonitis.
Gastroenteritis.
The Correct Answer is C
Choice C rationale
A mechanical bowel obstruction prevents the normal movement of intestinal contents, leading to the accumulation of gas and fluid proximal to the blockage. This increases intraluminal pressure, which can compromise blood flow to the bowel wall, leading to ischemia, necrosis, and eventual perforation. If the bowel perforates, bacteria and waste leak into the sterile peritoneal cavity, causing peritonitis. Peritonitis is a severe, life-threatening inflammatory response that can quickly lead to sepsis and multi-organ failure.
Choice A rationale
While certain types of cancer, such as colorectal cancer, can be the underlying cause of a mechanical bowel obstruction, the obstruction itself does not lead to the development of cancer. Cancer is a chronic process involving genetic mutations and uncontrolled cell growth over time. In contrast, the complications arising from a mechanical obstruction are acute and physiological, focusing on the immediate risks of tissue death and infection rather than the long-term development of a malignancy.
Choice B rationale
Ulcerative colitis is a chronic inflammatory bowel disease characterized by inflammation and ulcers in the digestive tract. It is an autoimmune condition rather than a complication of a physical blockage. While someone with ulcerative colitis might develop a bowel obstruction due to strictures formed by chronic inflammation, the reverse is not true. A mechanical obstruction does not trigger the specific autoimmune mechanisms required to cause ulcerative colitis, which is a lifelong inflammatory disorder.
Choice D rationale
Gastroenteritis is an inflammation of the lining of the stomach and intestines, usually caused by a viral or bacterial infection. It typically presents with symptoms like diarrhea and vomiting. While a bowel obstruction can cause vomiting, it does not cause gastroenteritis. Gastroenteritis is generally a self-limiting infection, whereas a mechanical obstruction is a physical emergency that requires medical or surgical intervention to prevent the much more serious and life-threatening complication of peritonitis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
The liver is the primary site for the synthesis of plasma proteins, most notably albumin. Albumin is essential for maintaining oncotic pressure within the vascular compartment, which keeps fluid inside the blood vessels. In liver failure, the production of albumin drops significantly below the normal range of 3.5 to 5.0 g/dL. This loss of oncotic pressure allows fluid to leak out of the capillaries and into the interstitial spaces, resulting in systemic edema and ascites.
Choice B rationale
A lymph node tumor can cause edema, but the mechanism is mechanical rather than biochemical. Such a tumor obstructs the lymphatic vessels, preventing the normal drainage of lymph fluid from the tissues back into the venous circulation. This leads to a localized buildup of protein-rich fluid known as lymphedema. Unlike liver failure, which causes systemic edema due to a lack of circulating plasma proteins, lymphedema is usually confined to the area distal to the site of obstruction.
Choice C rationale
Edema in pregnancy is common and multifactorial, usually resulting from increased venous pressure in the lower extremities due to the enlarging uterus and a general increase in total blood volume. While there is a slight physiological decrease in plasma protein concentration due to hemodilution, the primary driver of pregnancy-related edema is not a pathological lack of protein synthesis. Instead, it is related to hormonal changes and mechanical factors affecting venous return and capillary hydrostatic pressure.
Choice D rationale
Hypertension causes edema through an increase in capillary hydrostatic pressure. When the blood pressure within the vessels is high, it forces fluid out of the capillaries and into the surrounding tissues, exceeding the capacity of the lymphatic system to drain it. This occurs even if plasma protein levels are perfectly normal. Therefore, the edema resulting from hypertension is a result of excessive outward pressure rather than a lack of the inward-pulling oncotic pressure provided by plasma proteins.
Correct Answer is D
Explanation
Choice D rationale
Dysrhythmias are the most common and immediate complication after a myocardial infarction. When heart muscle cells are damaged or die due to lack of oxygen, the electrical conduction system of the heart is disrupted. The ischemic tissue can become irritable, leading to abnormal electrical impulses. These can range from relatively harmless premature contractions to life-threatening rhythms like ventricular tachycardia or ventricular fibrillation, which are the leading causes of death in the early post-infarction period.
Choice A rationale
Endocarditis is an infection of the inner lining of the heart chambers and valves, usually caused by bacteria entering the bloodstream. While a myocardial infarction causes structural damage, it does not inherently introduce pathogens into the heart to cause an infection. Endocarditis is more commonly associated with intravenous drug use, dental procedures, or prosthetic heart valves. Myocardial infarction affects the muscular layer (myocardium) rather than the endocardial lining through an infectious process.
Choice B rationale
Hyperthyroidism is an endocrine disorder characterized by the overproduction of thyroid hormone by the thyroid gland. It is not a complication of a myocardial infarction. While hyperthyroidism can cause cardiac issues like tachycardia or atrial fibrillation which might strain the heart, the reverse is not true. A heart attack is a localized vascular and muscular event in the heart and has no pathophysiological mechanism that would cause the thyroid gland to increase its hormone production.
Choice C rationale
Rheumatic fever is an inflammatory disease that can develop as a complication of an untreated or inadequately treated strep throat infection caused by group A Streptococcus bacteria. It can lead to permanent damage to the heart valves, known as rheumatic heart disease. This process is entirely distinct from a myocardial infarction, which is caused by coronary artery occlusion and ischemia. There is no link between the necrosis of heart muscle and the autoimmune response triggered by a streptococcal infection.
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