The normal pathway of the conduction system is which one of the following?
SA node - AV node - bundle of his - bundle branches - Purkinje fibers.
SA node - bundle of his -AV node - bundle branches - Purkinje fibers.
SA node - AV node - bundle branches - Ventricles - Purkinje fibers.
AV node-SA node - a bundle of his - bundle branches - Purkinje fibers.
The Correct Answer is A
This pathway represents the normal sequence of electrical impulses that coordinate the contraction and relaxation of the heart chambers.
The electrical signal originates from the sinoatrial (SA) node, which is often referred to as the natural pacemaker of the heart. It is located in the right atrium and generates the electrical impulses that initiate each heartbeat. From the SA node, the electrical signal travels to the atrioventricular (AV) node, which is located at the junction between the atria and ventricles.
After passing through the AV node, the electrical impulse travels through the bundle of His (also known as the atrioventricular bundle) and divides into the right and left bundle branches. These branches continue the conduction pathway and deliver the electrical signal to the Purkinje fibers.
The Purkinje fibers spread the electrical impulse rapidly throughout the ventricles, stimulating the contraction of the ventricular muscle and allowing for efficient pumping of blood out of the heart.
Therefore, the correct sequence of the normal conduction pathway in the heart is:
A. SA node - AV node - bundle of His - bundle branches - Purkinje fibers.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Septic shock is a life-threatening condition characterized by severe infection, systemic inflammation, and inadequate tissue perfusion. Hypotension, as indicated by a low blood pressure reading, is a significant concern in septic shock. It reflects inadequate perfusion to vital organs and tissues, leading to potential organ dysfunction and damage.
While all the assessment data provided may be important and require attention, the low blood pressure (BP) reading indicates impaired systemic perfusion and can contribute to end-organ damage. The nurse should prioritize interventions aimed at improving perfusion and stabilizing the patient's blood pressure.
A. Arterial oxygen saturation is 90% in (option A) is incorrect because While an arterial oxygen saturation of 90% is below the desired range, it is not as immediately life-threatening as low blood pressure. Oxygen therapy and interventions to improve oxygenation should still be initiated, but addressing hypotension takes priority.
B. Urine output of 15 ml for 2 hours in (option B) is incorrect because Decreased urine output is a concerning sign, as it may indicate impaired renal perfusion. However, the immediate concern in septic shock is addressing the low blood pressure to improve overall perfusion, including renal perfusion.
C. Apical pulse 110 beats/min in (option C) is incorrect because: Tachycardia is a common finding in septic shock and represents the body's compensatory response to maintain cardiac output. While it requires monitoring and consideration, low blood pressure is a more significant concern.

Correct Answer is D
Explanation
When the low-pressure alarm sounds, it indicates that the pressure being detected by the arterial line is below the set threshold. This could be due to a variety of reasons, such as a loose connection, air bubbles, or a shift in the zero-reference point.
Rezeroing the monitoring equipment involves recalibrating or resetting the baseline reference point for the arterial pressure waveform. This ensures accurate measurement and monitoring of the patient's arterial pressure.
A. Checking the right hand for a rash in (option A) is incorrect because While assessing the patient for any skin changes or rashes is important, it is not the first action to take in response to a low-pressure alarm.
B. Assessing the waveform for under-dampening in (option B) is incorrect because Assessing the waveform characteristics is important in arterial line monitoring, but it may not be the initial action when the low-pressure alarm sounds. Rezeroing the equipment should be performed before assessing waveform characteristics.
C. Assessing for cardiac dysrhythmias in (option C) is incorrect because Assessing for dysrhythmias is an important aspect of patient care, but it may not be directly related to the low-pressure alarm from the arterial line. Rezeroing the monitoring equipment takes precedence.
Therefore, when the low-pressure alarm sounds for a patient with an arterial line, the nurse should first re-zero the monitoring equipment to ensure accurate measurement of arterial pressure.

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