tachycardia is likely to compromise cardiac output if prolonged, although not all infants with subnormal heart rates have impaired perfusion. In acute anemia, selective vasoconstriction of the ...

DEAR DR. ROACH: I’m a 75-year-old woman who, for at least 10 years now, has been experiencing a rapid heart rate. My blood ...

Tachycardia is the medical term for an elevated resting heart rate, which can occur when your heart beats more than 100 times per minute. Several factors can cause your heart to beat too fast ...