What is the term for an increase in the number of white blood cells, often as a result of infection or inflammation?

Rationale:

A. Pulmonary fibrosis and scarring is incorrect. Pulmonary fibrosis involves thickening and stiffening of lung tissue, which leads to restrictive lung disease and reduced lung compliance. While it impairs gas exchange, it does not cause the characteristic wheezing seen in asthma, which is primarily due to airway obstruction rather than tissue stiffness.

B. Decreased lung compliance and atelectasis is incorrect. Decreased compliance and alveolar collapse (atelectasis) can impair ventilation and oxygenation, but they are not the primary mechanism for wheezing. Wheezing results from airflow limitation in the bronchi and bronchioles, not alveolar collapse.

C. Alveolar fluid accumulation and edema is incorrect. Pulmonary edema, often seen in heart failure or acute lung injury, causes crackles (rales) and shortness of breath, but it is not the main cause of wheezing in asthma. Wheezing is due to obstruction in small airways, not fluid in alveoli.

D. Airway inflammation and bronchoconstriction is correct. Asthma is characterized by chronic inflammation of the airways, leading to edema, mucus production, and hyperreactivity of bronchial smooth muscle. During an asthma attack, bronchoconstriction narrows the airways, causing turbulent airflow, which produces the high-pitched, musical sound known as wheezing. This pathophysiological process also contributes to symptoms such as shortness of breath, chest tightness, and cough, making it the primary mechanism underlying asthma-related wheezing.

Rationale:

A. Recurrent urinary frequency may occur as a symptom of urinary tract obstruction or irritation, but it is a relatively minor and common manifestation. While uncomfortable for the client, urinary frequency itself is not the most serious or life-threatening complication of hydronephrosis.

B. Renal failure is the primary concern in a client with hydronephrosis caused by an untreated kidney stone. Hydronephrosis occurs when urine flow is obstructed, leading to increased pressure within the renal pelvis and calyces. This pressure compresses renal tissue, impairs blood flow, and damages nephrons. If the obstruction persists, it can result in progressive kidney damage and potentially irreversible renal failure. The longer the obstruction remains untreated, the higher the risk of permanent loss of renal function, making renal failure the most serious and concerning complication.

C. Diabetic nephropathy is a form of chronic kidney disease caused by long-term diabetes mellitus. It is unrelated to hydronephrosis from urinary obstruction. While clients with diabetes may have an increased risk of kidney disease, diabetic nephropathy is not a direct complication of untreated kidney stones.

D. Orthostatic hypotension is a drop in blood pressure upon standing, often caused by dehydration, autonomic dysfunction, or certain medications. It is not a direct complication of hydronephrosis and is less clinically urgent than the risk of renal failure in this context.