The nurse notes that the client's rhythm strip indicates a PR-interval of 0.28 seconds. What is the nurse's analysis of this problem?

A. This type of AV block is characterized by a progressively lengthening PR interval until a QRS complex is dropped (a blocked beat). A PR interval of 0.28 seconds could be seen in 2nd degree Mobitz I (Wenckebach), not Mobitz II, which has a more irregular pattern of dropped beats
B. Atrial flutter: Atrial flutter is a type of arrhythmia characterized by rapid atrial rates (typically around 250-350 beats per minute) with a sawtooth pattern of P-waves. It does not relate to the PR interval, but rather the atrial rhythm.
C. Sinus bradycardia: Sinus bradycardia is characterized by a slower-than-normal heart rate (less than 60 beats per minute), but this does not affect the PR interval directly. A normal PR interval (0.12-0.20 seconds) can still be seen in sinus bradycardia, so the prolonged PR interval in this case makes sinus bradycardia less likely.
D. 1st degree AV block: In 1st degree AV block, the PR interval is consistently prolonged, usually more than 0.20 seconds, but it is still a constant, non-variable delay in the conduction between the atria and ventricles. A PR interval of 0.28 seconds (which is longer than normal but consistent) is characteristic of a first-degree AV block, making it the correct answer.

A. A patient with blood type A- can receive A- blood, as it matches both the ABO blood group and Rh factor.
B. A patient with A- blood cannot receive AB blood because the blood type is incompatible in terms of both ABO group and Rh factor. AB blood contains both A and B antigens, which could lead to an immune response in a type A patient.
C. O- blood is a universal donor for all blood types, meaning it does not contain A or B antigens and does not have the Rh factor, so it can be given to an A- patient.
D. As already noted, A- blood is compatible with an A- patient because both the ABO group and Rh factor are the same.
E. O+ blood contains the Rh antigen, and since the patient is A-, they cannot receive Rh-positive blood, as this could cause an immune reaction.