A nurse is teaching staff about the conduction of the heart. In which order will the nurse present the conduction cycle, starting with the initial impulse? Bundle of His, Purkinje network, Intraventricular pathways, Sinoatrial (SA) node, Atrioventricular (AV) node

Correct Answer: B

Rationale: The cardiac conduction cycle starts at the sinoatrial (SA) node (4), the heart’s pacemaker, generating the impulse. It travels to the atrioventricular (AV) node (5), then to the Bundle of His (1), through the intraventricular pathways (3), and finally to the Purkinje network (2) for ventricular contraction. The correct sequence is 4, 5, 3, 1,

Correct Answer: C

Rationale: Purse-lip breathing prolongs exhalation, reducing air trapping and improving oxygenation, especially in COPD. Sleeping flat, avoiding exercise, or increasing salt don’t enhance oxygenation.

Correct Answer: A

Rationale: Right-sided heart failure often results from pulmonary hypertension, increasing resistance in lung circulation, unlike aortic stenosis, mitral regurgitation, or left ventricular issues.

Correct Answer: B

Rationale: Bronchodilators (e.g., albuterol) relax bronchial smooth muscles, opening airways and improving oxygenation in bronchospasm, unlike antibiotics, diuretics, or antihypertensives.

Correct Answer: A

Rationale: Pink nail beds indicate good peripheral oxygenation and circulation, unlike cold extremities (poor perfusion), tachypnea (respiratory distress), or confusion (hypoxia).