A client's ECG tracing shows normal sinus rhythm followed by a complex of three PVCs, with a return to normal sinus rhythm.
What is the nurse's interpretation of this finding?

Choice A rationale

A white blood cell count of 13.8 x 103/uL is elevated above the standard reference range of 4.5 to 11.0 x 103/uL. This leukocytosis indicates a systemic inflammatory response or active infection, likely originating from the urinary tract given the patient's symptoms. In an 80-year-old, an elevated white blood cell count combined with new-onset confusion and fever is a critical indicator of potential urosepsis requiring immediate clinical investigation and antibiotic therapy to prevent further decline.

Choice B rationale

The hemoglobin level of 14.4 g/dL falls within the normal physiological range for an adult female, which is typically 12.0 to 16.0 g/dL. While this value is normal, it may reflect slight hemoconcentration due to the patient's poor fluid intake of only 2 to 3 glasses a day during extreme heat. However, it does not represent an acute pathological state or a clinical emergency requiring immediate intervention compared to the other abnormal inflammatory markers present.

Choice C rationale

A lactate level of 3.2 mmol/L is significantly elevated, as the normal range is typically less than 2.0 mmol/L. Lactic acidosis in the context of infection suggests tissue hypoxia and anaerobic metabolism, which are hallmark signs of sepsis and impaired perfusion. This finding is a high-priority clinical marker that necessitates aggressive fluid resuscitation and stabilization. It indicates that the patient's infection has progressed to a state of systemic physiological distress and impending circulatory collapse.

Choice D rationale

The platelet count of 98 x 103/uL is below the normal range of 150 to 450 x 103/uL, indicating thrombocytopenia. In a patient with suspected sepsis, a dropping platelet count is a concerning sign of hematologic dysfunction or the early stages of disseminated intravascular coagulation. This represents organ dysfunction associated with severe infection. Immediate intervention is required to address the underlying sepsis and monitor for bleeding risks or further consumption of clotting factors during the inflammatory process.

Choice E rationale

A glucose level of 140 mg/dL is slightly above the normal fasting range of 70 to 99 mg/dL but is often expected in an elderly patient experiencing physiological stress or infection. Stress-induced hyperglycemia occurs due to the release of cortisol and catecholamines, which increase hepatic glucose production. While elevated, 140 mg/dL does not constitute a medical emergency or a primary target for immediate intervention in the acute phase of treating sepsis and fluid volume deficit.

Choice A rationale

Supraventricular tachycardia (SVT) is characterized by a regular, very rapid heart rate that typically exceeds 150 beats per minute. In SVT, the P waves are often buried in the preceding T waves because the rate is so fast that the electrical activity overlaps. While this rhythm involves a rapid rate, it does not match the specific criteria for SVT if the rate is lower or if distinct P waves are clearly visible before every QRS complex.

Choice B rationale

Normal sinus rhythm (NSR) is the standard electrical activity of the heart, originating from the sinoatrial node. It must have a regular rate between 60 and 100 beats per minute in an adult. Each QRS complex must be preceded by a normal P wave with a consistent PR interval. If the rate exceeds 100 beats per minute, it no longer meets the definition of NSR and must be classified as a tachycardia, even if all other waves look normal.

Choice C rationale

Sinus tachycardia is defined as a sinus rhythm with a heart rate greater than 100 beats per minute in an adult, typically ranging from 101 to 180 beats per minute. It maintains a regular rhythm where each QRS complex is preceded by a visible P wave, indicating the sinoatrial node is still the primary pacemaker. This occurs due to increased sympathetic stimulation, exercise, fever, or pain, reflecting a normal physiological response to various stressors on the body.

Choice D rationale

Bigeminy is a specific type of arrhythmia characterized by a repeating pattern where every second beat is a premature contraction, most commonly a premature ventricular contraction (PVC). This results in a "grouped beating" appearance on the EKG strip rather than a continuous, fast, regular rate. Because bigeminy involves an irregular rhythm with alternating beat morphologies, it is distinctly different from a sinus-driven tachycardia where all the QRS complexes appear uniform and regular.