Increasing heart rate does not increase stroke volume. At first, increasing exertion increases both heart rate and stroke volume. As the heart rate increases, the time spent in diastole decreases, so there is less time for the ventricles to fill with blood. The stroke volume therefore stops increasing, and as the heart rate approaches the maximum heart rate the stroke volume may begin to decrease.
If your heart rate increases because of adrenaline (related to your emotional state) that is unlikely to kill you. There are some conditions, particularly ventricular fibrillation, in which increased heart rate can kill you, but in most forms of sickness, increased heart rate is not dangerous.
On an ECG the heart rate will match both ventricular rate and atrial rate if the heart is normal. If people have atrial fibrilation then the ventricular rate will be used on the ECG to work out the rate of the ventricular contraction and vice-versa with ventricular fibrilation. Usually both atrial and ventricular rates match so if the atria contracts at 70 BPM the ventricles will beat at 70 BPM. It is possible for the ECG machine to work out atrial or ventricular rate if needs be. Usually, however, if the ECG machine just displays heart rate then both ventricular and atrial rates match.
Ventricular fibrillation, and supraventricular or ventricular tachycardia.
Diastole, specifically the duration of ventricular filling, decreases with a more rapid heart rate. This means less time for the ventricles to fill with blood before the next contraction, potentially impacting cardiac output.
Nonsustained ventricular tachycardia is elevated heart rate originating in the ventricles that stops on its own.
breathing and heart rate increased. breathing and heart rate increased.
Heart rate and ventricular wall tension
A rapid heart rate can originate in either the left or right ventricle. Ventricular tachycardia which lasts more than 30 seconds is referred to as sustained ventricular tachycardia
Place the stethoscope over the heart (left side of the chest) and count the heart beat for a full minute.
Increased heart rate and increased stroke volume
The ICD-9 code for left ventricular dysfunction is 429.9. Left ventricular dysfunction can lead to heart failure. Some signs include increased rate of breathing and increased work of breathing. You may hear wheezing also.