Final answer:
Increased preload in the cardiac chambers generally does not lead to a decreased heart rate; instead, it may result in symptoms like shortness of breath or fatigue and can contribute to congestive heart failure if the increase is significant.
Step-by-step explanation:
Increased preload of the cardiac chambers may lead to symptoms such as shortness of breath, and fatigue, and potentially could contribute to congestive heart failure if the increased preload is significant and sustained. Preload is the initial stretching of the cardiac myocytes before contraction and is related to venous blood pressure. An increase in preload indicates a larger volume of blood entering the heart, which makes the heart work harder and can eventually lead to symptoms if the heart is unable to cope with the increased workload. High preload can be beneficial to a point by following the Frank-Starling mechanism; however, if it is excessive, it can lead to increased cardiac output up to a limit beyond which the condition may deteriorate. This is often associated with conditions such as hypertension or valvular dysfunction. In none of the sources provided or commonly known physiological responses increased preload result in a decreased heart rate.