ABG Blood Interpretation Notes with Latest Structured Questions and Correct Detailed Answers Already Rated and A Graded

ABG Blood Interpretation Notes with Latest Structured
Questions and Correct Detailed Answers Already
Rated and A Graded



List 3 common arterial blood sampling sites. -
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WS CORRECT ANSWER >>>The arterial blood sample may be obtained from the rad
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ial, dorsalis pedis, brachial, or femoral arteries in the adult.
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Describe the procedure for doing the modified Allen's Test. -
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WS CORRECT ANSWER >>>To perform this test, the clinician instructs the patient t
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o make a tight fist. Then compress both the radial and ulnar arteries. Now instruct the
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patient to open and relax his fist, revealing a blanched palm and fingers. Then release t
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he pressure over the ulnar artery while observing the patient's palm for changes in colo
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r. If collateral flow is adequate, the patient's hand will "pink up" within 10 to 15 secon
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ds; this constitutes a positive Allen's test. A positive result documents that collateral blo
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od flow is adequate and that the radial artery is an acceptable puncture site. If the test
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is negative (the palm does not pink up rapidly), the radial artery is not an acceptable si
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te for puncture. In such cases, the other wrist is evaluated or the brachial artery is used
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for the puncture site.
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Why is it important to remove air bubbles from the sample? -
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WS CORRECT ANSWER >>>The oxygen and CO2 gas tensions of the bubbles may e
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quilibrate with the blood and result in
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erroneous measurements. WS




How long should pressure be applied to the puncture site? -
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WS CORRECT ANSWER >>>After the needle is withdrawn, the wound should be pres
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surized for a period of at least 3 to 5 minutes or longer, if clotting problems exist.
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1 | WS


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,List the measurements that are used to assess o
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xygen status acid-base
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balance

adequacy of ventilation - WS WS WS



WS CORRECT ANSWER >>>The measurements obtained from analysis of arterial and
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mixed venous blood samples are useful in evaluating the following:
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• Acid-base balance (pH, Paco2, HCO3−, base excess)
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• Oxygenation status (Pao2, Sao2, Cao2, Pv¯o2) WS WS WS WS WS




• Adequacy of ventilation (Paco2) WS WS WS




List the normal values for the followi
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ng PaO2 WS




PAO2 - WS




WS CORRECT ANSWER >>>Partial Pressure of Oxygen in Arterial Blood NOR
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MAL VALUE: approximately 80 to 100 mm Hg in room air
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Partial Alveolar Oxygen Differen
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ce NORMAL VALUE: 100 torr
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Calculate the PAO2 given the following informatio
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n FiO2=0.40
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Pb = 747 mm Hg
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PaCO2 = 40 mm Hg - CORRECT ANSWER >>>PAO2 = (PB- PH2O)FIO2- PaCO2(1.25)
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, = (747 mm Hg - 47 mm Hg)0.40 - 40 mm Hg(1.25)
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4 | WS


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