Which of the following ECG rhythm interval measures is considered abnormal?
QTc interval 0.33 to 0.47 seconds
QT interval that varies with HR
QRS interval <0.12 seconds
PR interval 0.12 to 0.24 seconds
The Correct Answer is A
The QTc (corrected QT) interval is a measure of the time it takes for the ventricles to depolarize and repolarize during a cardiac cycle. It is corrected for heart rate (HR) to account for variations in the cardiac cycle length.
The normal range for the QTc interval varies depending on the calculation method used but generally falls within 0.36 to 0.44 seconds. In the given options, the range of 0.33 to 0.47 seconds for the QTc interval is wider than the normal range, suggesting a prolonged QTc interval, which can be indicative of a potential risk for arrhythmias, including ventricular tachycardia and torsades de pointes.
B. QT interval that varies with HR in (option B) is normal because The QT interval alone can vary with heart rate, and this is considered a normal physiological adaptation.
C. QRS interval <0.12 seconds in (option C) is normal because The QRS interval represents the time it takes for ventricular depolarization and is normally less than 0.12 seconds.
D. PR interval 0.12 to 0.24 seconds in (option D) is normal because The PR interval represents the time it takes for atrial depolarization and conduction through the AV node. The normal range is typically 0.12 to 0.20 seconds.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","D","E"]
Explanation
These manifestations occur as compensatory mechanisms in response to decreased blood volume and compromised tissue perfusion. The body attempts to compensate for the inadequate circulating volume by increasing heart rate (A) and respiratory rate (B) to enhance oxygen delivery.
D. The decreased systolic blood pressure (D) is a result of decreased cardiac output and vasoconstriction in an attempt to maintain perfusion to vital organs.
E. The decreased urine output (E) is a result of decreased renal perfusion due to decreased blood volume.
C. Decreased pulse rate in (option C) is incorrect because it is not typically seen in the compensatory stage of hypovolemic shock. The body tries to increase heart rate to maintain cardiac output and compensate for the decreased blood volume.
F. Bilateral crackles in (option F) is incorrect because the lung bases are more commonly associated with conditions such as pulmonary edema or fluid overload, rather than the compensatory stage of hypovolemic shock.
It's important to note that the manifestations of shock can vary depending on individual patient factors and the underlying cause of shock. Therefore, a comprehensive assessment and clinical judgment are necessary to fully evaluate the patient's condition.
Correct Answer is B
Explanation
The patient's symptoms of fever and elevated white blood cell count suggest a potential infection and sepsis. Broad-spectrum antibiotics should be initiated promptly to cover a wide range of possible pathogens until further diagnostic tests and identification of the specific causative agent are obtained. Early administration of appropriate antibiotics is crucial in sepsis management to target the suspected infection and improve patient outcomes.
A. Cooling baths in (option A) is incorrect because: Cooling baths are typically used in the management of hyperthermia or specific conditions like heatstroke. While the patient has an elevated temperature, it is likely due to the systemic inflammatory response rather than solely hyperthermia.
C. Blood transfusion in (option C) is incorrect because Blood transfusion may be required in certain cases of sepsis if there is evidence of significant anemia or active bleeding. However, based on the information provided, there is no immediate indication of a blood transfusion.
D. NPO status in (option D) is incorrect because NPO status (nothing by mouth) is a general precautionary measure used in various situations, such as prior to surgery or to manage gastrointestinal complications. It is not a specific intervention in the sepsis resuscitation bundle.
Therefore, the nurse should initiate the intervention of administering broad-spectrum antibiotics in this scenario.
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