A client is to receive Synthroid 25 mcg PO daily. Synthroid unit dose available is 0.05 mg/ tablet. How many tablets (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero)

A. Sinus Bradycardia, with First Degree AV block, Rate 40: The rhythm strip shows regular P waves, each followed by a QRS complex, indicating a sinus rhythm. The PR interval is prolonged (greater than 0.20 seconds) but remains consistent across all beats. This confirms a first-degree AV block. The ventricular rate is approximately 40 bpm, consistent with sinus bradycardia.

B. Second Degree AV block – Mobitz I, Rate 40: Mobitz I (Wenckebach) is characterized by a progressively lengthening PR interval followed by a dropped QRS complex. This pattern is not seen here; the PR intervals are consistently prolonged.

C. Second Degree AV block – Mobitz II, Rate 40: Mobitz II involves intermittent dropped QRS complexes without progressive PR prolongation. In the strip, no QRS complexes are missing, ruling out Mobitz II.

D. Third Degree Heart Block, Rate 40: In complete heart block, there is no relationship between P waves and QRS complexes (AV dissociation). Here, the P waves are consistently followed by QRS complexes, indicating intact conduction, even if delayed. This therefore is not a third-degree block.

A. calculate the number of small squares between one QRS complex and the next one and divide by 1500: This method provides an accurate heart rate calculation, but it is more time-consuming and typically used when precision is needed. It is not the quickest method for rapid bedside estimation of rate.

B. use the 3 second markers to count the number of QRS complexes in 6 seconds and multiply by 10: This is the fastest and most commonly used method for quickly estimating heart rate on an ECG strip. By counting the QRS complexes in a 6-second interval and multiplying by 10, the nurse gets an approximate beats-per-minute rate.

C. count the number of large squares in the R-R interval and divide by 300: This method also provides a quick estimate of heart rate but is best suited for regular rhythms. If the rhythm is irregular, this approach can yield inaccurate results.

D. print a 1-minute ECG strip and count the number of QRS complexes: While accurate, this method is inefficient for quick bedside estimation and is rarely used in practice for rapid assessment due to the time it takes to obtain and interpret a full-minute strip.