A consistent prolongation of the P-R interval beyond 0.20 seconds indicates a first-degree atrioventricular (AV) block. This type of block is characterized by a delay in the conduction of electrical impulses through the AV node, resulting in a prolonged P-R interval. However, every P wave is still followed by a QRS complex, distinguishing it from higher-degree AV blocks where some P waves are not followed by QRS complexes.References: = CCRN Exam Handbook, page 35

Signs of ischemia may be very subtle and are often not detectable by CT scan until 12-24 hours after the onset of symptoms. A CT scan is much better at detecting intracranial bleeding than it is at detecting ischemia; however, it is capable of both. An MRI is more effective at detecting an ischemic than a CT scan. Contrast is not absolutely necessary to detect ischemia using a CT scan.

Clinical inquiry is the ongoing process of questioning and evaluating practice throughout a nurse's career, ensuring that they provide informed practice. Nurses are responsible for continuing to grow and expand their own clinical knowledge. While ongoing education provided by their employer may play an important role in this, the nurse should not rely on this ongoing education to maintain their clinical knowledge. A nurse should not rely primarily on information they were taught in nursing school or experience they have developed in their own practice. While these can be powerful sources of clinical knowledge, they can also become outdated without the nurse realising it.

Normal pH ranges from 7.35-7.45. Normal CO2 (carbon dioxide) levels range from 35-45 mmHg, and normal HCO3 (bicarbonate) levels range from 22-26 mEq/L. CO2 is the respiratory component and HCO3 is the metabolic component. The component that matches the pH is the system controlling the ABG (Arterial Blood Gas).
In this scenario, the pH is at the high end of normal (toward the alkalotic side), but the HCO3 (acidotic at
16 mEq/L) and CO2 (alkalotic at 25 mmHg) levels indicate something abnormal is happening. Because the body generally does not overcompensate, the alkalotic factor is the primary culprit. Since the pH is normal, but PaCO2 and HCO3 are abnormal, the body is compensating for something:
pH 7.35 - 7.40 - Recovering acidosis
pH 7.40 - 7.45 - Recovering alkalosis
Here, there is a respiratory alkalosis, and the normal pH means it has been fully compensated.

Thyroid storm or thyrotoxic crisis is a life-threatening emergency with mortality up to 30% (highly likely to be fatal). It is a rare condition in developed countries, typically seen with undiagnosed or under- treated hyperthyroidism.
If a patient is experiencing this condition, emergency management involves immediate administration of beta-blockers (propranolol, esmolol) to blunt the sympathetic nervous system receptors, plus medications that block thyroid synthesis and release of more thyroid hormone (methimazole, propylthiouracil).
Synthroid is the main component of treating hypothyroidism; therefore, it would only exacerbate a thyrotoxic crisis.