Quiz-396-Section 3

What does an escalating baseline on a capnogram, where the waveform fails to return to zero between breaths, primarily indicate?

Etiology

The patient is hypoventilating due to sedation.

The patient is experiencing a metabolic surge in CO₂ production.

The patient is rebreathing previously exhaled CO₂.

The sampling line is partially obstructed by condensation.

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A patient on a transport ventilator with a closed-circuit system shows a capnogram with a progressively rising baseline and a concurrent rise in EtCO₂ over several minutes. The patient's respiratory rate and tidal volume have remained constant. Which of the following is the most likely cause?

Equipment limitations

Exhaustion of the CO₂ absorber canister.

Incompetence of the expiratory unidirectional valve.

A leak in the inspiratory limb of the circuit.

Onset of malignant hyperthermia.

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During a manual bag-valve-mask ventilation, the paramedic observes that the reservoir bag moves bilaterally (expands and contracts) during both the inspiratory and expiratory phases. The capnogram shows an elevated baseline. Which of the following is the most likely explanation?

Equipment limitations

The CO₂ absorber is exhausted.

One or both unidirectional valves are incompetent.

The endotracheal tube cuff is under-inflated.

The patient is experiencing severe bronchospasm.

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Which of the following capnographic patterns is most consistent with a significant leak in the inspiratory limb of a breathing circuit?

Capnographic pattern of a circuit leak

A progressively rising baseline with a preserved waveform shape.

An obtuse beta angle with a zero baseline.

A flatline waveform with no CO₂ detection.

A falsely low EtCO₂ reading due to sample dilution.

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A patient presents with an escalating baseline on the capnogram. The paramedic suspects a mechanical circuit failure. Which of the following steps is the most appropriate initial action to confirm this suspicion?

Differentiating mechanical vs. physiologic causes

Increase the ventilator rate to blow off the excess CO₂.

Administer a bronchodilator to rule out bronchospasm.

Perform a brief 100% manual bag-valve ventilation with a known-good BVM.

Increase the fresh gas flow to the minimum setting.

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How does the capnographic presentation of hypoventilation differ from that of CO₂ rebreathing?

Distinguishing hypoventilation from rebreathing

In hypoventilation, the EtCO₂ rises but the baseline returns to zero; in rebreathing, the baseline fails to return to zero.

In hypoventilation, the baseline fails to return to zero; in rebreathing, the EtCO₂ remains normal.

In hypoventilation, the waveform becomes shark-fin; in rebreathing, the waveform becomes flat.

In hypoventilation, the alpha angle widens; in rebreathing, the beta angle narrows.

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A patient on a transport ventilator has an escalating baseline. The paramedic has confirmed the circuit is intact and the absorber is fresh. The patient is hemodynamically stable with no signs of increased metabolic rate. What is the most appropriate next step?

Management of escalating baseline

Increase the ventilator rate to compensate for the perceived hypercapnia.

Administer sodium bicarbonate to buffer the acidosis.

Switch to a non-rebreather mask immediately.

Inspect the unidirectional valves and check for moisture or debris.

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When an escalating baseline is identified on a capnogram, what is the primary principle guiding the paramedic's response?

Priority of action for escalating baseline

Rule out mechanical circuit failure before assuming patient deterioration.

Immediately increase the fresh gas flow to flush the circuit.

Assume the patient is in malignant hyperthermia and prepare dantrolene.

Reduce the tidal volume to prevent barotrauma.

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