Chronic diarrhea alternating with constipation is most indicative of:
diverticulitis.
irritable bowel syndrome.
Crohn's disease.
ulcerative colitis.
The Correct Answer is B
Choice A rationale
Diverticulitis involves the inflammation or infection of small pouches called diverticula that form in the colon wall. Common clinical manifestations include acute left lower quadrant pain, fever, and leukocytosis. While bowel habits may change, the classic presentation is localized pain and infection rather than a long-term, cyclic pattern of alternating diarrhea and constipation. It requires antibiotics and often a temporary low-fiber diet during acute flare-ups to allow the bowel to rest.
Choice B rationale
Irritable bowel syndrome is a functional gastrointestinal disorder characterized by abdominal pain and altered bowel habits. The hallmark sign is the chronic fluctuation between diarrhea and constipation, often referred to as IBS-M. It does not cause structural damage or inflammation like inflammatory bowel disease. Pathophysiology involves visceral hypersensitivity and abnormal gut motility. Symptoms are often triggered by stress or specific foods, and diagnosis is frequently based on the Rome criteria for functional gut disorders.
Choice C rationale
Crohn's disease is an inflammatory bowel disease that can affect any part of the gastrointestinal tract from the mouth to the anus. It typically involves transmural inflammation and skip lesions. While it causes diarrhea and abdominal pain, it is less commonly associated with the specific rhythmic alternation of constipation seen in functional disorders. Complications include fistulas, strictures, and malabsorption. It is an autoimmune condition that requires immunosuppressants or biologics rather than being a primary motility issue.
Choice D rationale
Ulcerative colitis primarily affects the mucosal layer of the colon and rectum in a continuous fashion. The most prominent symptom is bloody diarrhea with mucus and urgent tenesmus. Patients may experience up to 20 stools per day during severe exacerbations. While constipation can occur in proctitis, the hallmark of the disease is inflammatory diarrhea. It is not defined by the functional alternating pattern characteristic of irritable bowel syndrome and usually presents with systemic signs of inflammation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Infection of the endocardium describes endocarditis, which is an inflammatory process usually involving the heart valves and the inner lining of the heart chambers. This condition is typically caused by bacteria entering the bloodstream and colonizing damaged heart tissue. While serious, it is a different pathological process from a myocardial infarction, which is primarily a vascular event involving the coronary arteries rather than a primary infectious process of the heart lining.
Choice B rationale
A temporary deficit of oxygen that resolves with rest is the physiological definition of angina pectoris, specifically stable angina. In this state, the heart muscle experiences ischemia, which causes pain, but the cells do not suffer permanent damage or death because blood flow is restored quickly. Myocardial infarction is distinguished from this by the fact that the deprivation of oxygen is prolonged enough to cause irreversible tissue death and cellular necrosis.
Choice C rationale
Myocardial infarction occurs when a coronary artery is completely or nearly completely obstructed, often by a ruptured plaque followed by thrombus formation. This total blockage halts the delivery of oxygen and nutrients to the downstream cardiac tissue. Without blood flow, the myocytes undergo anaerobic metabolism, eventually leading to cell death and the loss of contractile function. This permanent structural damage is the defining characteristic of an infarction versus transient ischemia.
Choice D rationale
An increase in oxygen consumption by myocardial cells can trigger ischemia if the supply cannot keep up, but it does not describe the primary mechanism of an infarction. While high heart rates or hypertension increase demand, an infarction is defined by the failure of the supply line, usually due to a physical blockage. Increased demand is more often the precipitating factor for stable angina in a patient who already has narrowed, but not blocked, arteries.
Correct Answer is B
Explanation
Choice A rationale
Afterload represents the resistance or pressure against which the ventricles must pump to eject blood during systole. It is determined largely by systemic vascular resistance and aortic pressure. While afterload influences the volume of blood ejected, it does not define the total volume pumped over a sixty second interval. High afterload can decrease stroke volume and eventually lead to cardiac hypertrophy or failure if the compensatory mechanisms of the myocardium are overwhelmed by chronic stress.
Choice B rationale
Cardiac output is the total volume of blood pumped by a ventricle into the circulation over a period of one minute. It is calculated by multiplying the stroke volume by the heart rate. Normal resting cardiac output for an adult is approximately 4 to 8 liters per minute. This parameter is a critical indicator of how well the heart functions as a pump to meet the metabolic demands and oxygen requirements of the body tissues and organs.
Choice C rationale
Stroke volume refers to the amount of blood ejected from the left ventricle with each individual contraction or heartbeat. It is the difference between end-diastolic volume and end-systolic volume. While it is a major component used to calculate cardiac output, it only measures the volume per single beat rather than the cumulative volume over a full minute. Normal stroke volume ranges from 60 to 100 milliliters per beat in a healthy adult at rest.
Choice D rationale
Systole is the phase of the cardiac cycle during which the heart muscle contracts and pumps blood from the chambers into the arteries. It is a temporal phase rather than a volumetric measurement. During ventricular systole, the mitral and tricuspid valves close while the aortic and pulmonic valves open. This phase is essential for circulation, but the term itself does not quantify the specific volume of blood moved during a specific one minute timeframe.
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