In the context of pacing, what does the term "capture" refer to?

In pacing, the term "capture" specifically refers to the successful stimulation of cardiac tissue resulting in a heartbeat. This occurs when the electrical impulse generated by the pacemaker successfully depolarizes the myocardial cells, leading to the contraction of the heart muscle. Capture is essential for effective pacing, as it indicates that the pacemaker is communicating with the heart and effectively prompting it to beat.

If capture is achieved, it indicates that the pacing threshold has been effectively met, meaning that the electrical energy delivered is sufficient to cause the heart muscle to contract. This can be monitored through clinical assessment or diagnostic tools, ensuring that the pacemaker is functioning correctly and maintaining an effective heart rhythm. If capture does not occur, it would signify potential issues with the pacing lead, the settings of the pacemaker, or the cardiac tissue's response, and further evaluation would be required.