A nurse is performing a respiratory system physical examination. To assess the resonance of voice sounds heard during auscultation of the lungs, the nurse instructs the patient to say "ee," and if the sound is heard as "ay," this is known as:

Choice a reason:
The oral mucosa is the most reliable area to evaluate for central cyanosis in a client with asthma. Central cyanosis reflects a decrease in arterial oxygenation and is best assessed where the blood flow is high and the skin is thin, which is the case with the oral mucosa. It is less likely to be affected by peripheral factors such as temperature and is therefore a more accurate indicator of oxygen saturation in the central circulation.

Choice b reason:
While ear lobes can show signs of cyanosis, they are not the most reliable indicator of central cyanosis because they are more prone to peripheral cyanosis. Peripheral cyanosis can occur in the ear lobes due to local vasoconstriction or decreased blood flow, which may not reflect central oxygenation levels.

Choice c reason:
The soles of the feet are not a reliable indicator of central cyanosis, especially in a client with asthma. The skin on the soles is thicker and has less blood flow compared to the oral mucosa, making it a poor site for assessing central cyanosis. Additionally, the soles can be affected by peripheral factors like pressure and temperature.

Choice d reason:
Conjunctivae are not the most reliable indicator of central cyanosis. While they can show signs of cyanosis, the assessment can be affected by environmental factors and the presence of blood vessels in the conjunctiva that may not accurately reflect central oxygenation levels.

Choice A Reason:
Positioning the arm below waist level is not recommended when measuring blood pressure. It can result in an inaccurate reading, typically showing a higher blood pressure due to the effects of gravity on the blood column. The arm should be positioned at heart level for an accurate measurement.

Choice B Reason:
While palpating the radial artery to confirm a pulse is present is part of the overall assessment of circulation, it is not a necessary step immediately before measuring blood pressure. The focus should be on ensuring the client is in the correct position and is relaxed to avoid any factors that might artificially alter the blood pressure reading.

Choice C Reason:
Asking the client to sit quietly in a chair for 5 minutes is the correct procedure before measuring blood pressure. This allows the client's heart rate and blood pressure to stabilize, providing a more accurate measurement. Any activity or stress can temporarily raise blood pressure, so this quiet time is crucial.

Choice D Reason:
The arm selected for blood pressure measurement should not be covered with clothing. Clothing can constrict the blood pressure cuff and interfere with the accuracy of the reading. The cuff should be placed on bare skin to ensure it inflates and deflates correctly and that the stethoscope can accurately detect the sounds of the blood flow.