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Cardiac diagnostic tests and lab values Flashcards

(2 cards)

1
Q

BUN (blood urea nitrogen)

A

Range: 10-20 mg/dl

Purpose: BUN and creatinine are end products of protein metabolism excreted by the kidneys.

Elevated = reduced renal perfusion from decreased cardiac output or intravascular fluid volume deficit as a result of diuretic therapy or dehydration.

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2
Q

Ca++ (Calcium)

A

Range: 8.6-10.2 mg/dL

Purpose:Calcium is necessary for blood coagulability, neuromuscular activity, and automaticity of the nodal cells (sinus and atrioventricular nodes).

Hypocalcemia: -slow nodal function -impairs myocardial contractility which increases the risk for heart failure.

Hypercalcemia: -occurs with the thiazide diuretics, these meds reduce renal excretion of calcium. -potentiates digitalis toxicity, causes increased myocardial contractility, and increases the risk for varying degrees of heart block and sudden death from ventricular fibrillation.

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