Emergency procedure and Heart massage

Emergency procedure noun - Medicine) a procedure adopted to meet an emergency (especially a medical emergency.

Heart massage and emergency procedure are semantically related. In some cases you can replace phrase "Heart massage" with "Emergency procedure", this phrases are similar.

Heart massage noun - An emergency procedure that employs rhythmic compression of the heart (either through the chest wall or, during surgery, directly to the heart) in an attempt to maintain circulation during cardiac arrest.

Emergency procedure and heart massage are semantically related. You can use "Emergency procedure" instead a noun phrase "Heart massage".