What is a primary symptom of oedema?

In elderly people,the heart has to pump blood with more force due to.......

The condition in which the heart is not pumping blood effectively enough to meet the needs of the body is called:

Chest pain due to inadequate oxygen supply to the heart muscle is called:

What is the condition called when the heart rate is lower than normal?

Given below are the abnormal conditions related to blood circulation. Name the disorders.
$(a)$ Acute chest pain due to failure of $O_{2}$ supply to heart muscles
$(b)$ Increased systolic pressure