A client with acute respiratory distress syndrome (ARDS) shows no improvement despite increases in concentration in oxygen administered. What intervention should the nurse attempt which may improve ventilation-perfusion matching?

D. Atrial fibrillation can lead to irregular and often rapid heart rates, resulting in discrepancies between the apical (heart) and radial (peripheral) pulses. In atrial fibrillation, the atria fibrillate instead of contracting effectively, leading to irregular and sometimes asynchronous ventricular contractions. This irregularity may result in a pulse deficit, where the number of apical beats exceeds the number of radial pulses felt at the wrist.

A. Different blood pressures in the upper limbs may indicate conditions such as aortic dissection or arterial stenosis, but they are not typically associated with atrial fibrillation. Atrial fibrillation primarily affects the heart rhythm rather than blood pressure distribution.

B. Differences in upper and lower lung sounds may indicate conditions such as pneumonia or pleural effusion, but they are not specific to atrial fibrillation. Atrial fibrillation primarily affects the heart's electrical activity rather than respiratory findings.

C. Differences between oral and axillary temperatures may indicate localized variations in temperature, such as infection or inflammation, but they are not specific to atrial fibrillation. Atrial fibrillation primarily affects cardiac rhythm rather than body temperature regulation.

D Normal saline bolus administration is indicated for hypovolemia or inadequate intravascular volume, which can lead to decreased cardiac output and hypotension. In this scenario, the client has an amber urine output of 45ml in the last 3 hours, indicating decreased urine output and potential hypovolemia. The elevated blood pressure (170/67 mmHg) suggests possible volume overload or fluid retention, but the decreased urine output raises concerns for inadequate intravascular volume. Therefore, administering a normal saline bolus may be the first priority to optimize intravascular volume and improve cardiac output.

A Isosorbide mononitrate is a vasodilator commonly used in the treatment of heart failure and angina. It helps reduce preload and afterload, thereby decreasing the workload on the heart. However, in this scenario, the client's blood pressure is elevated (170/67 mmHg), and there is no indication of acute decompensation or pulmonary congestion. Therefore, isosorbide PO may not be the first priority medication at this time.

B Nitroglycerin is a potent vasodilator commonly used to manage acute heart failure exacerbations and acute coronary syndromes. It helps reduce preload and afterload, improving cardiac output and relieving symptoms of heart failure. In this scenario, the client's blood pressure is elevated, but the heart rate is normal, and there are no signs of acute decompensation. Therefore, initiating a nitroglycerin drip may not be the first priority unless the client develops symptoms of acute decompensation or pulmonary congestion.

C Dopamine is a vasopressor medication that can be used to increase blood pressure and cardiac output in patients with hypotension or shock. However, in this scenario, the client's blood pressure is elevated (170/67 mmHg), and there is no evidence of hypotension. Therefore, initiating a dopamine drip may not be appropriate at this time and could potentially exacerbate hypertension.