A patient is admitted to the emergency department with a head injury after a motor vehicle accident. Which of the following may indicate that the patient suffered injury to the frontal lobe of the brain?

Choice A rationale

This clinical finding occurs when blood backs up into the pulmonary circulation from the left ventricle. Increased hydrostatic pressure in the lung capillaries causes fluid to leak into the alveoli, leading to shortness of breath when lying flat. This reflects left-sided cardiac dysfunction rather than right-sided failure. Normal capillary wedge pressure ranges between 4 and 12 mmHg, but this increases significantly when the left side fails to pump effectively.

Choice B rationale

This condition involves fluid accumulation in the lungs due to the inability of the left atrium and ventricle to move blood forward into the systemic circulation. It results in crackles, tachypnea, and cough. Since the right side of the heart pumps blood into the lungs, its failure would actually decrease pulmonary flow, not cause congestion. This symptom is a hallmark of left-sided heart failure and elevated pulmonary artery occlusive pressures above 18 mmHg.

Choice C rationale

When the right ventricle fails, it cannot effectively pump blood into the pulmonary artery, causing a backup into the superior and inferior vena cava. This systemic venous congestion leads to increased pressure in the hepatic veins. The liver becomes engorged with blood, leading to enlargement and tenderness. Central venous pressure typically rises above the normal range of 2 to 8 mmHg, indicating volume overload in the systemic venous circuit and hepatic congestion.

Choice D rationale

Right-sided heart failure increases systemic venous hydrostatic pressure, which forces fluid out of the capillaries and into the interstitial spaces. Due to gravity, this fluid primarily accumulates in the lower extremities of ambulatory patients or the sacrum of bedridden patients. Normal interstitial fluid volume is maintained by a balance of pressures, but right ventricular dysfunction disrupts this, leading to visible swelling. This is a classic sign of systemic backup from the right heart.

Choice E rationale

Chronic systemic venous hypertension from right-sided failure leads to fluid leakage into the peritoneal cavity. This occurs because the high pressure in the portal system and systemic veins overrides the oncotic pressure provided by albumin. Normal portal venous pressure is 5 to 10 mmHg; elevations beyond this due to heart failure cause significant abdominal distension. This systemic accumulation of fluid is characteristic of the right ventricle's inability to handle the venous return from the body.

Choice A rationale

While secondary hypertension can cause organ damage if left untreated, this is not its defining characteristic. Both primary and secondary hypertension can lead to complications like stroke, kidney failure, and heart disease. The distinguishing factor of secondary hypertension is its etiology rather than its severity. Organ damage is often more a function of the duration and magnitude of the blood pressure elevation rather than whether the underlying cause is identified or is considered to be idiopathic in nature.

Choice B rationale

This statement describes primary or essential hypertension, which accounts for about 90 to 95 percent of all hypertension cases. Primary hypertension has no single identifiable cause and is thought to result from a complex interaction of genetics and lifestyle factors. Secondary hypertension, by definition, has a specific, identifiable underlying cause. Common causes of secondary hypertension include chronic kidney disease, primary aldosteronism, renovascular disease, sleep apnea, or certain medications like oral contraceptives and nonsteroidal anti-inflammatory drugs.

Choice C rationale

Secondary hypertension is high blood pressure that is caused by another medical condition. Because it is a symptom of an underlying issue, treating that specific condition often results in the blood pressure returning to normal or becoming much easier to manage. For example, if a patient has a pheochromocytoma, removing the tumor usually cures the hypertension. This distinguishes it from essential hypertension, which requires lifelong management with lifestyle changes and medications because the root cause cannot be definitively removed.

Choice D rationale

The term silent killer is used to describe hypertension in general, both primary and secondary, because it often has no obvious symptoms while it causes progressive damage to the cardiovascular system. Patients can have dangerously high blood pressure for years without feeling any different. However, this nickname does not specifically define what secondary hypertension is or how it differs from the primary form. The focus of the term is on the asymptomatic nature of high blood pressure rather than its underlying cause.