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In the third degree of atrioventricular block, the PR interval variation was irregular. In the second degree of type I atrioventricular block, the PR interval changes periodically.
Two vials of the Covid vaccine, which are used in two stages with an interval of 21 days. Calendar-reminder. Two doses with a syringe.
Woman Doing High-Intensity Interval Training Outdoors. High Plank Exercise. Autumn
Fit women with a healthy lifestyle doing jumping jacks during high-intensity interval training. Pretty women in a HIIT class at the gym
Sinus tachycardia, 3D illustration showing sinus rhythm with shortened RR intervals and increased heart rate.

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