Atherosclerosis can develop in high pressure systems, such as arteries, and not in low pressure systems, such as veins. It is high blood pressure that can damage the lining of the blood vessel and initiate the process of atherosclerosis.
BUT, atherosclerosis can develop in veins that have been used as grafts instead of arteries, for example, in a coronary ...
The procedure described here is called venesection. It is no longer standard of care, but was when Treasure Island was written.
Here is an excerpt from the first edition of Cecil's Textbook of Medicine (1927):
During the acute apoplectic attack the following therapy may be employed: The patient should be put to bed with the head elevated. If he has ...
Basic Cardiac Rhythms – Identification and Response (The University of Toledo, Medical Center)
This quite thorough one-page source describes:
Basic heart anatomy and physiology
The meaning of the waves in ECG
Examples of ECGs for most arrhythmias with timing, causes, symptoms and treatment
Here's Pocket Guide to Neonatal ECG Interpretation (NICU INK Book ...