Blood Pressure Measurement OSCE Guide Quiz

• A Palpate the brachial artery medial to the biceps tendon, align the cuff marker over it, support the relaxed arm at heart level and ask the volunteer to remain quiet. ✓
• B Palpate the brachial artery lateral to the biceps tendon, align the cuff marker over it, support the relaxed arm at heart level and ask the volunteer to remain quiet.
• C Palpate the brachial artery medial to the biceps tendon, align the cuff marker over it, support the arm above heart level and ask the volunteer to remain quiet.
• D Palpate the brachial artery medial to the biceps tendon, place the stethoscope over the radial artery at the wrist, support the relaxed arm at heart level and ask the volunteer to remain quiet.
• E Palpate the brachial artery medial to the biceps tendon, align the cuff marker over it, ask the volunteer to hold their arm out unsupported at heart level and remain quiet.

Explanation

Why A is correct

See Applying the Cuff. Option A is correct because it corrects every error in the scenario. The brachial artery is the vessel you listen over, and it lies in the antecubital fossa (the hollow at the front of the elbow) just medial to the biceps brachii tendon, roughly in line with the medial epicondyle of the humerus. The cuff has an artery marker, which should be lined up over that artery so that the compression and later listening are directed at the right vessel. The cuff's lower edge should be about 2 to 3 cm above the fossa so that the stethoscope can sit under it, and the cuff should be firm but loose enough to slide a finger under. The arm should be relaxed and supported at heart level. An unsupported arm needs muscle effort to hold it up, and this isometric contraction raises the reading. Talking during measurement can also raise systolic pressure by several mmHg, so the patient should stay quiet. Remember the checklist: find the artery, line up the marker, support the arm, keep quiet.

• Artery: palpate the brachial artery just medial to the biceps tendon and align the cuff marker over it.
• Arm position: relaxed and supported at heart level, because an unsupported arm raises the reading.
• Patient: should stay quiet, as talking raises systolic pressure.

Why the other options are incorrect

• B. Palpate the brachial artery lateral to the biceps tendon, align the cuff marker over it, support the relaxed arm at heart level and ask the volunteer to remain quiet.: Palpating lateral to the biceps tendon places the hand away from the brachial artery, which lies medial to the tendon, so the cuff marker and stethoscope would not be centred over the vessel.
• C. Palpate the brachial artery medial to the biceps tendon, align the cuff marker over it, support the arm above heart level and ask the volunteer to remain quiet.: Supporting the arm above heart level produces a falsely low reading because the column of blood exerts less pressure; the arm must be supported at heart level.
• D. Palpate the brachial artery medial to the biceps tendon, place the stethoscope over the radial artery at the wrist, support the relaxed arm at heart level and ask the volunteer to remain quiet.: Korotkoff sounds are heard over the brachial artery in the antecubital fossa, not over the radial artery at the wrist, so this would not capture the correct sounds.
• E. Palpate the brachial artery medial to the biceps tendon, align the cuff marker over it, ask the volunteer to hold their arm out unsupported at heart level and remain quiet.: Holding the arm out unsupported requires isometric muscle contraction, which raises the reading, so the arm must be relaxed and supported at heart level.

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