Upon assessment of your patient, their breathing rate is 24, they have a toxic appearance, and an SpO2 of 90%. You plan to call the MD to report your findings.
What do you anticipate that she will order?

Choice A rationale

Albuterol is a short-acting beta-2 adrenergic agonist, primarily causing bronchodilation by stimulating beta-2 receptors in bronchial smooth muscle, leading to cyclic AMP production and muscle relaxation. While beneficial for bronchospasm, it does not directly address the severe hypercapnia and respiratory acidosis indicated by the patient's ABG (pH 7.21, CO2 75), which suggests significant ventilatory failure beyond simple bronchodilation.

Choice B rationale

BiPAP (Bilevel Positive Airway Pressure) provides non-invasive ventilatory support, delivering inspiratory and expiratory positive airway pressure. This improves alveolar ventilation by increasing tidal volume and reducing the work of breathing, effectively decreasing the elevated CO2 (75 mmHg, normal range 35-45 mmHg) and improving the acidotic pH (7.21, normal range 7.35-7.45) in a patient with acute hypercapnic respiratory failure exacerbated by COPD.

Choice C rationale

Administering oxygen via nasal cannula at 1 L/min may worsen hypercapnia in COPD patients with chronic CO2 retention, due to the blunting of hypoxic drive. Their primary respiratory stimulus is hypoxia, and providing supplemental oxygen can suppress this drive, further depressing ventilation and exacerbating CO2 retention, which is already dangerously high at 75 mmHg. The SpO2 of 87% (normal range 95-100%) indicates hypoxemia, but the primary issue is ventilatory failure.

Choice D rationale

Breathing into a paper bag increases the rebreathing of exhaled CO2, which is a therapeutic intervention for hyperventilation and respiratory alkalosis. In this patient, the ABG shows significant respiratory acidosis (pH 7.21, CO2 75 mmHg), meaning they are retaining too much CO2. Therefore, increasing CO2 rebreathing would exacerbate the already severe hypercapnia and acidosis, leading to further decompensation.

Choice A rationale

Reverse Trendelenburg positions the patient with the head higher than the feet. While this can reduce venous pressure in the lower extremities, it is not the optimal position for infratentorial tumor resection as it may not adequately facilitate venous drainage from the posterior fossa and could increase pressure on the incision site.

Choice B rationale

Semi-Fowlers position, with the head of the bed elevated to 30-45 degrees, is often used for supratentorial surgeries to promote venous drainage. However, for infratentorial tumor removal, this position can put undue pressure on the operative site due to gravity, potentially leading to complications such as swelling and CSF leakage.

Choice C rationale

Positioning the patient flat on their side is the recommended approach after infratentorial surgery. This position prevents pressure on the incision site and promotes optimal venous and cerebrospinal fluid drainage from the posterior fossa. It also helps to prevent complications such as tentorial herniation and brainstem compression.

Choice D rationale

High Fowlers position, with the head of the bed elevated to 60-90 degrees, is generally contraindicated after infratentorial surgery. This position significantly increases pressure on the posterior fossa incision due to gravity and can compromise cerebral venous outflow, potentially leading to increased intracranial pressure and other neurological deficits.