Final answer:
The claim that an increased heart rate increases catheter stability is false. Increased heart rate may actually decrease cardiac output by reducing ventricular filling time, and can potentially make catheters less stable.
Step-by-step explanation:
The statement 'Increased heart rate increases catheter stability' is generally considered false. In the context of cardiac output for a healthy young adult, when the heart rate increases above 160 bpm, cardiac output does not necessarily increase and may in fact decrease due to insufficient ventricular filling time and decreased stroke volume. An increased heart rate triggered by factors such as exercise, stress, or illness can lead to enhanced cardiac demand. However, stability of a catheter within the cardiovascular system is influenced by many factors including the physical properties of the catheter, the patient's anatomy, and the interaction between the catheter and the beating heart. A rapid heart rate can cause more motion of the catheter, potentially reducing its stability within the vessels.