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Pathophysiology

Clinical meaning

Type I (hypoxemic) respiratory failure is defined by PaO2 < 60 mmHg with normal or low PaCO2, caused by V/Q mismatch, shunt, diffusion impairment, or low FiO2. Common causes include pneumonia, ARDS, PE, and pulmonary edema. Type II (hypercapnic) respiratory failure involves PaCO2 > 45 mmHg (with or without hypoxemia), caused by alveolar hypoventilation from reduced respiratory drive (opioids, CNS depression), neuromuscular weakness (GBS, MG crisis, ALS), chest wall restriction (obesity hypoventilation, kyphoscoliosis), or severe airflow obstruction (COPD, asthma). The A-a gradient distinguishes between these mechanisms: normal A-a gradient (< 15 in young adults, increases with age) with hypercapnia suggests pure hypoventilation; widened A-a gradient suggests parenchymal or vascular disease. The formula PAO2 = (FiO2 × 713) - (PaCO2/0.8) calculates the expected alveolar oxygen tension for comparison with measured PaO2.

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Topic overview

Respiratory Failure: Type I vs Type II: historical NP/APRN lesson restored from legacy corpus (us-np-whnp).

Clinical reasoning

For Respiratory Failure: Type I vs Type, connect the assessment cue to the immediate risk before selecting an action for NP. Start with stability, ABCs, neurologic change, medication risk, infection risk, and scope of practice. Then decide whether the safest next step is assess, intervene, escalate, teach, or evaluate response.

Patient safety implications

A missed priority in Respiratory Failure: Type I vs Type can delay recognition of deterioration or allow preventable harm to continue. Protect the client first by verifying abnormal cues, using ordered precautions, escalating unstable findings, and reassessing after intervention.

Example application

In a Respiratory Failure: Type I vs Type item, explain the first cue you noticed, the complication it predicts, the nursing action within scope, and the finding that proves the response worked.

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Respiratory Failure: Type I Vs Type

Clinical meaning

Diagnosis & workup

Management

Prescribing & monitoring

Takeaways

Review after learning, not during it.

Topic overview

Clinical reasoning

Patient safety implications

Example application

Continue Your Learning

Check your understanding

Clinical pearl

Reference anchors

Check your understanding

Clinical meaning

Topic overview

Clinical reasoning

Patient safety implications

Example application

Continue Your Learning

Check your understanding

Catalog and editorial metadata

Clinical pearl

Reference anchors

Check your understanding