chronotropic incompetence
Pronunciation: KRON-oh-trop-ik in-KOM-puh-tuhns
The inability to increase heart rate appropriately in response to increased metabolic demand or pharmacological stimulation.
Full Definition
Chronotropic incompetence represents a form of cardiac dysfunction where the heart rate response to physiological or pharmacological stress is blunted or absent. This condition is commonly seen in patients with sinus node dysfunction, those on beta-blockers, or following cardiac denervation after transplantation. In cardiovascular anesthesiology, chronotropic incompetence poses challenges for hemodynamic management, as patients cannot compensate for decreased stroke volume through heart rate increases. These patients may require alternative inotropic support or temporary pacing.
Usage
Usage note: Often confused with simple bradycardia; emphasize the lack of appropriate response to demand.
In Context
- "Chronotropic incompetence necessitated pacemaker insertion before cardiac surgery." — Preoperative planning document
- "The patient's chronotropic incompetence limited the hemodynamic response to stress." — Physiological assessment