A client in the ICU has a pulmonary artery catheter in place.
Which hemodynamic parameters are directly measured using this catheter?

Mean arterial pressure (MAP), cardiac output (CO), and pulmonary artery pressure (PAP).

Pulmonary artery pressure (PAP), pulmonary artery wedge pressure (PAWP), and cardiac output (CO).

Mean arterial pressure (MAP), central venous pressure (CVP), and systemic vascular resistance (SVR).

Cardiac output (CO), stroke volume (SV), and systemic vascular resistance (SVR).

Answer and Explanation

The Correct Answer is B

Monitoring critical illness requires understanding hemodynamic monitoring through invasive catheters. Knowledge of cardiovascular physiology and the specific capabilities of the Swan-Ganz catheter is necessary to distinguish between parameters that are directly measured versus those calculated via mathematical hemodynamic formulas.

Choice A rationale

Pulmonary artery catheters do not measure mean arterial pressure, which requires a peripheral arterial line. PAP and CO are measured, but the inclusion of MAP makes this choice incorrect as it assesses systemic rather than pulmonary hemodynamics.

Choice B rationale

This catheter sits in the pulmonary artery, allowing direct measurement of systolic, diastolic, and mean PAP. Inflation of the balloon allows measurement of PAWP, while thermistor technology enables the direct calculation of cardiac output via thermodilation.

Choice C rationale

Central venous pressure is measured via the proximal port of the catheter, but MAP and SVR are not direct measurements. SVR is a calculated value derived from MAP, CVP, and CO using a mathematical formula.

Choice D rationale

While cardiac output is measured directly, stroke volume and systemic vascular resistance are calculated parameters. Stroke volume is determined by dividing cardiac output by heart rate, while SVR utilizes the pressure gradient across the systemic circuit.

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Correct Answer is A

Explanation

Discharge teaching for post-radiation brain tumor patients requires understanding oncology and pharmacology. Knowledge of medication adherence, symptom monitoring for increased intracranial pressure, and integumentary protection is needed. Identifying misconceptions ensures patient safety and prevents potential neurological relapse or secondary injury.

Choice A rationale

Abrupt cessation of medications, especially anticonvulsants or steroids used in neuro-oncology, can trigger rebound edema or seizures. Maintaining therapeutic blood levels is critical for managing potential complications after radiation therapy has concluded to ensure neurological stability.

Choice B rationale

Headaches and visual disturbances are primary indicators of increased intracranial pressure or tumor recurrence. Patients must recognize these signs as urgent neurological changes that require immediate medical evaluation to prevent brain herniation or permanent functional loss.

Choice C rationale

Radiation therapy damages the DNA of skin cells, leading to thinning and increased sensitivity. Protecting the scalp from ultraviolet radiation prevents severe dermatitis and secondary burns on tissue that already has compromised healing capabilities.

Choice D rationale

Gradual reintegration into daily life is standard post-treatment advice. While energy levels dictate activity, resuming normal routines as tolerated is appropriate, provided the patient avoids hazardous activities if they have residual neurological deficits or seizure risks.

A. Dilantin should be mixed in dextrose in water before administration. B. Dilantin should be administered through an IV catheter in the client's hand. C. Rapid Dilantin administration can cause cardiac dysrhythmias. D. Therapeutic drug levels should be maintained between 20 to 30 mg/mL.

Correct Answer is C

Explanation

Administering phenytoin requires applying knowledge of intravenous drug compatibility and cardiovascular safety profiles. The nurse must prioritize monitoring for life-threatening complications associated with rapid infusion, specifically focusing on the drug's narrow therapeutic index and its significant irritant properties.

Choice A rationale

Phenytoin is highly unstable and will precipitate if mixed with dextrose solutions. It must only be diluted with 0.9 percent sodium chloride. Incorrect dilution can lead to crystalline emboli and loss of drug efficacy during administration.

Choice B rationale

Intravenous phenytoin is a known vesicant that can cause purple glove syndrome if administered into small peripheral veins like those in the hand. Use of a large-bore catheter in a large vein or central line is preferred.

Choice C rationale

Rapid infusion of phenytoin can lead to severe cardiovascular collapse, including hypotension and fatal dysrhythmias. The infusion rate should not exceed 50 mg per minute to allow the heart to tolerate the drug's membrane-stabilizing effects safely.

Choice D rationale

The standard therapeutic range for phenytoin is 10 to 20 mcg per mL, not 20 to 30 mg per mL. Levels exceeding 20 mcg per mL often result in toxicity, characterized by nystagmus, ataxia, and decreased mental status.

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A client in the ICU has a pulmonary artery catheter in place. Which hemodynamic parameters are directly measured using this catheter?

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A client in the ICU has a pulmonary artery catheter in place.
Which hemodynamic parameters are directly measured using this catheter?