2. Anemia 3. Hypoxia 4. Hyperthyroidism 5. Hyper secretion of catecholamine 6. Cardiomyopathy 7. Valvular heart diseases 8. Acute Radiation Syndrome Figure 1.2.1 Tachycardia 1.2.2 Bradycardia Bradycardia is defined as a heart rate less than 60 beats per minute although it is seldom symptomatic until below 50 bpm when a human is at total rest. This number can vary as children and small adults tend to have faster heart rates than average adults. Bradycardia may be associated with medical conditions such as hypothyroidism. Trained athletes tend to have slow resting heart rates, and resting bradycardia in athletes should not be considered abnormal if the individual has no symptoms associated with it. For example Miguel Indurain, a Spanish cyclist and five time Tour de France winner, had a resting heart rate of 28 beats per minute, one of the lowest ever recorded in a healthy human.[5] Figure 1.2.2 Bradycardia
2. Anemia 3. Hypoxia 4. Hyperthyroidism 5. Hyper secretion of catecholamine 6. Cardiomyopathy 7. Valvular heart diseases 8. Acute Radiation Syndrome Figure 1.2.1 Tachycardia 1.2.2 Bradycardia Bradycardia is defined as a heart rate less than 60 beats per minute although it is seldom symptomatic until below 50 bpm when a human is at total rest. This number can vary as children and small adults tend to have faster heart rates than average adults. Bradycardia may be associated with medical conditions such as hypothyroidism. Trained athletes tend to have slow resting heart rates, and resting bradycardia in athletes should not be considered abnormal if the individual has no symptoms associated with it. For example Miguel Indurain, a Spanish cyclist and five time Tour de France winner, had a resting heart rate of 28 beats per minute, one of the lowest ever recorded in a healthy human.[5] Figure 1.2.2 Bradycardia