Which report is the most appropriate source for compiling daily blood pressure readings for hypertensive patients?

The most appropriate source for compiling daily blood pressure readings for hypertensive patients is the vital signs record. This is the case because the vital signs record is specifically designed to track and document measurements related to a patient's physiological status, including blood pressure, heart rate, respiratory rate, and temperature. This record typically includes regular entries of vital signs taken at specified intervals, which allows healthcare providers to easily monitor changes over time and identify trends.

The other options, while they contain important health information, do not focus specifically on the ongoing monitoring of vital signs. The initial nursing assessment record captures a baseline set of vital signs and patient information at the time of admission. Physician progress notes may offer narrative updates on a patient's condition and treatments but are not structured for the systematic collection of vital signs. The admission record provides comprehensive initial information but does not include regular updates on daily readings. Therefore, the vital signs record is the most appropriate and reliable source for consistently maintaining and reviewing daily blood pressure measurements for hypertensive patients.