Freebase(0.00 / 0 votes)Rate this definition: Chronotropic. Chronotropic effects are those that change the heart rate. Chronotropic drugs may change the heart rate by affecting the nerves controlling the heart, or by changing the rhythm produced by the sinoatrial node. Positive chronotropes increase heart rate; negative chronotropes decrease heart rate.
Erectile dysfunction (ED), formerly known as impotence, is the inability to achieve or maintain an erection long enough to engage in sexual intercourse. Under normal circumstances, when a man is sexually stimulated, his brain sends a message down the spinal cord and into the nerves of the penis.
    Erectile Dysfunction is a big title for a simple and   common problem. If a male cannot achieve   an erection, or cannot maintain an erection; that would be â¦ Erectile Dysfunction (also known as ED). For some men ED is constant and   chronic for others it is occasional or inconvenient.