<prompt> Vagal stimulation of hea causes? irrelevant to pharmacologyIncreased hea rateIncreased RR interval in ECGIncreased cardiac outputIncreased force of contraction  <response>: Increased RR interval is seen in ECG on vagal stimulation. Normal values for waves and intervals are as follows: RR interval: 0.6-1.2 seconds. P wave: 80 milliseconds. ... QT interval: 420 milliseconds or less if the hea rate is 60 beats per minute bpm Ref: KD Tripathi 8th ed. 