Provided is an ECG image of Atrial fibrillation.
Irregularly irregular rhythm with no discernible P waves and fibrillatory waves.
Regular rhythm with sawtooth-shaped waves between QRS complexes.
Regular rhythm with a rate between 60 to 100 beats per minute.
Wide QRS complexes with a rate exceeding 150 beats per minute.
The Correct Answer is A
Choice A rationale
This rhythm occurs when multiple ectopic foci in the atria fire rapidly, leading to a loss of coordinated atrial contraction. The absence of a single depolarization origin means P waves are replaced by chaotic fibrillatory waves. Because the atrioventricular node receives these impulses randomly, the ventricular response is irregularly irregular. This hemodynamic inefficiency often leads to blood stasis in the atria, significantly increasing the risk of thromboembolic events such as stroke.
Choice B rationale
A regular rhythm characterized by sawtooth waves is indicative of atrial flutter rather than fibrillation. In flutter, a macro-reentrant circuit typically in the right atrium creates a consistent, rapid atrial rate, often around 300 beats per minute. The atrioventricular node usually blocks a portion of these impulses, resulting in a 2 to 1 or 3 to 1 conduction ratio. This maintains a regular ventricular rhythm, unlike the chaotic irregularity seen in fibrillation.
Choice C rationale
A regular rhythm with a rate between 60 to 100 beats per minute defines a normal sinus rhythm. In this state, the sinoatrial node acts as the primary pacemaker, sending organized electrical impulses through the atria and then to the ventricles. This produces a clear P wave before every QRS complex and a consistent PR interval. Since atrial fibrillation is inherently irregular and lacks P waves, it does not meet these criteria for normalcy.
Choice D rationale
Wide QRS complexes at a rate exceeding 150 beats per minute are characteristic of ventricular tachycardia. This life-threatening arrhythmia originates in the ventricles, bypassing the normal conduction system and leading to widened QRS durations greater than 0.12 seconds. In contrast, atrial fibrillation usually presents with narrow QRS complexes unless a bundle branch block is present. The primary issue in fibrillation is atrial chaos, not the rapid, wide ventricular firing seen here.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Powerlessness refers to the perception that one's own actions will not significantly affect an outcome. While a critical care environment can certainly contribute to a lack of control, the specific physiological and psychological response to constant auditory stimuli like alarms and pumps is more directly related to sensory processing. Powerlessness is a broader psychosocial response to the loss of autonomy in the hospital setting, whereas constant noise specifically targets the patient's neurological and sensory thresholds.
Choice B rationale
Frustration is an emotional response to being hindered or blocked from reaching a goal. While a patient may feel frustrated by the noise and the inability to rest, this is a secondary emotional consequence. The primary clinical phenomenon occurring when the environment is filled with constant, competing auditory stimuli is the saturation of the brain's ability to process information. Frustration describes the feeling, but it does not capture the physiological state of sensory system exhaustion and overstimulation.
Choice C rationale
Physical pain is a localized or generalized unpleasant sensory and emotional experience associated with actual or potential tissue damage. While the stress of a noisy environment can lower a patient's pain tolerance or increase the perception of existing pain due to lack of rest, the noise itself is not the source of physical pain. Pain management requires different interventions, such as analgesics, whereas managing environmental noise requires a reduction in stimuli to prevent the exhaustion of the patient's sensory receptors.
Choice D rationale
Sensory overload occurs when an individual receives more sensory stimuli than their nervous system can navigate or process simultaneously. In an intensive care unit, the repetitive and unpredictable nature of monitor alarms, ventilator hissing, and pump humming keeps the reticular activating system in a state of constant arousal. This prevents the patient from entering deep sleep and leads to cognitive impairment, anxiety, and disorientation. Normal environmental processing becomes impossible as the brain is bombarded by excessive auditory inputs.
Correct Answer is D
Explanation
Choice A rationale
Teaching the patient about fluid restriction is a critical component of long-term chronic disease management for heart failure to prevent future exacerbations. However, education is a lower priority during an acute phase of fluid volume excess. When a patient presents with physical symptoms like a significant 3-pound weight gain and peripheral edema, the nurse must prioritize physiological stabilization and pharmacological intervention over teaching, as the patient may be too distressed to effectively learn or retain information.
Choice B rationale
A thorough respiratory assessment is vital to check for pulmonary edema, often manifested by crackles or decreased oxygen saturation, which frequently accompanies right-sided heart failure progression. While assessment is a key nursing step, the symptoms provided already confirm significant systemic fluid overload. After identifying the problem through these initial findings, the nurse should move to the intervention that will directly resolve the fluid excess and prevent the patient from progressing into acute respiratory distress or failure.
Choice C rationale
Encouraging sodium restriction is a necessary dietary modification because sodium promotes water retention through osmotic pressure, worsening the workload on a failing heart. Like fluid restriction education, this is a secondary prevention strategy meant for long-term maintenance. In the presence of acute jugular vein distention and rapid weight gain, dietary changes will not work fast enough to relieve the current pressure on the cardiovascular system or reduce the extracellular fluid volume effectively.
Choice D rationale
Administering a prescribed diuretic, such as furosemide, is the priority because it directly addresses the fluid volume excess by promoting the excretion of sodium and water by the kidneys. This pharmacological intervention reduces the preload and systemic venous pressure, thereby alleviating the jugular vein distention and ankle edema. Rapid diuresis is necessary to prevent the fluid from backing up further into the pulmonary circulation, which could lead to life-threatening pulmonary edema and impaired gas exchange.
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