Respiratory Changes in Pregnancy | NurseNest Maternal-Newborn | NurseNest

Key Concepts

Introduction

Structural changes: - Diaphragm elevated 4 cm (uterus pushes up) - Thoracic cage widens (subcostal angle increases from 68° to 103°) - These changes compensate — overall tidal volume increases despite elevated diaphragm Lung volumes: - Tidal volume (TV): INCREASES 40–50% (most important change) — more air per breath - Residual volume (RV): decreases 20% — air remaining after maximum exhalation - Functional residual capacity (FRC): decreases 20–25% - Total lung capacity (TLC): slightly decreases (elevated diaphragm) - Vital capacity: unchanged or slightly increased - Respiratory rate: unchanged or minimally increased (12–16/min) - Minute ventilation: INCREASES 40–50% (TV × RR) — primary driver Gas exchange: - Progesterone stimulates respiratory center → increases sensitivity to CO2 → hyperventilation - Result: maternal PaCO2 decreases to 27–32 mmHg (normal non-pregnant: 35–45) - Compensatory metabolic acidosis: bicarbonate (HCO3−) decreases to 18–21 mEq/L - Result: mildly alkalotic ABG: pH 7.40–7.47 - Maternal PaO2 increases slightly (to 104–108 mmHg) - This creates a gradient favoring O2 transfer to fetus (fetal pO2 remains lower) Dyspnea of pregnancy: - Common complaint (~70% of pregnant women), especially 2nd trimester...

Respiratory Adaptations

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Signs and Symptoms

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Red Flags / Danger Signs

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Nursing Assessment and Interventions

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Clinical Pearls

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Client Education

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Your exam focus

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Next steps

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Learning Objectives

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Key Takeaways

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Topic overview

Maternal-newborn nursing lesson for NCLEX-RN learners: Respiratory Changes in Pregnancy. Clinical framing, safety cues, prioritization patterns, and exam-style rationale for Respiratory Changes in Pregnancy.

Clinical reasoning

For Respiratory Changes in Pregnancy, connect the assessment cue to the immediate risk before selecting an action for RN. 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 Changes in Pregnancy 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.

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Introduction: Structural changes: - Diaphragm elevated 4 cm (uterus pushes up) - Thoracic cage widens (subcostal angle increases from 68° to 103°) - These changes compensate — overall tidal volume increases despite elevated diaphragm Lung volumes: - Tidal volume (TV): INCREASES 40–50% (most important change) — more air per breath - Residual volume (RV): decreases 20% — air remaining after maximum exhalation - Functional residual capacity (FRC): decreases 20–25% - Total lung capacity (TLC): slightly decreases (elevated diaphragm) - Vital capacity: unchanged or slightly increased - Respiratory rate: unchanged or minimally increased (12–16/min) - Minute ventilation: INCREASES 40–50% (TV × RR) — primary driver Gas exchange: - Progesterone stimulates respiratory center → increases sensitivity to CO2 → hyperventilation - Result: maternal PaCO2 decreases to 27–32 mmHg (normal non-pregnant: 35–45) - Compensatory metabolic acidosis: bicarbonate (HCO3−) decreases to 18–21 mEq/L - Result: mildly alkalotic ABG: pH 7.40–7.47 - Maternal PaO2 increases slightly (to 104–108 mmHg) - This creates a gradient favoring O2 transfer to fetus (fetal pO2 remains lower) Dyspnea of pregnancy: - Common complaint (~70% of pregnant women), especially 2nd trimester...

Introduction: Structural changes: - Diaphragm elevated 4 cm (uterus pushes up) - Thoracic cage widens (subcostal angle increases from 68° to 103°) - These changes compensate — overall tidal volume increases despite elevated diaphragm Lung volumes: - Tidal volume (TV): INCREASES 40–50% (most important change) — more air per breath - Residual volume (RV): decreases 20% — air remaining after maximum exhalation - Functional residual capacity (FRC): decreases 20–25% - Total lung capacity (TLC): slightly decreases (elevated diaphragm) - Vital capacity: unchanged or slightly increased - Respiratory rate: unchanged or minimally increased (12–16/min) - Minute ventilation: INCREASES 40–50% (TV × RR) — primary driver Gas exchange: - Progesterone stimulates respiratory center → increases sensitivity to CO2 → hyperventilation - Result: maternal PaCO2 decreases to 27–32 mmHg (normal non-pregnant: 35–45) - Compensatory metabolic acidosis: bicarbonate (HCO3−) decreases to 18–21 mEq/L - Result: mildly alkalotic ABG: pH 7.40–7.47 - Maternal PaO2 increases slightly (to 104–108 mmHg) - This creates a gradient favoring O2 transfer to fetus (fetal pO2 remains lower) Dyspnea of pregnancy: - Common complaint (~70% of pregnant women), especially 2nd trimester...

Introduction: Structural changes: - Diaphragm elevated 4 cm (uterus pushes up) - Thoracic cage widens (subcostal angle increases from 68° to 103°) - These changes compensate — overall tidal volume increases despite elevated diaphragm Lung volumes: - Tidal volume (TV): INCREASES 40–50% (most important change) — more air per breath - Residual volume (RV): decreases 20% — air remaining after maximum exhalation - Functional residual capacity (FRC): decreases 20–25% - Total lung capacity (TLC): slightly decreases (elevated diaphragm) - Vital capacity: unchanged or slightly increased - Respiratory rate: unchanged or minimally increased (12–16/min) - Minute ventilation: INCREASES 40–50% (TV × RR) — primary driver Gas exchange: - Progesterone stimulates respiratory center → increases sensitivity to CO2 → hyperventilation - Result: maternal PaCO2 decreases to 27–32 mmHg (normal non-pregnant: 35–45) - Compensatory metabolic acidosis: bicarbonate (HCO3−) decreases to 18–21 mEq/L - Result: mildly alkalotic ABG: pH 7.40–7.47 - Maternal PaO2 increases slightly (to 104–108 mmHg) - This creates a gradient favoring O2 transfer to fetus (fetal pO2 remains lower) Dyspnea of pregnancy: - Common complaint (~70% of pregnant women), especially 2nd trimester...