61.   Powered by rechargeable batteries, they automatically sense irregular heart rhythm, determine if a shock is warranted and signal the operator to fire a charge.

62.   Researchers meeting here Thursday advised those who are completely dependent on pacemakers for normal heart rhythms to avoid using digital cell phones.

63.   Some patients experience abnormal heart rhythms that can lead to death if untreated.

64.   Some preliminary research also indicates that fish oils may help to prevent a potentially fatal disruption in heart rhythm called ventricular fibrillation.

65.   Studies show that stress, sleep disorders, high blood pressure and irregular heart rhythms are only part of the health fallout.

66.   The aim is to control a rapid heart rhythm called supraventricular tachycardia and lower her blood pressure to ease the wear and tear on her valve implant.

67.   The fatty acids help ward off sudden death by being incorporated into cell membranes in the heart, where they have a stabilizing effect on heart rhythm.

68.   The device is used to control rapid heart rhythms.

69.   The genes also help maintain heart rhythms.

70.   The doctors will stimulate the heart electrically, and possibly with drugs, to determine if they can induce an abnormal heart rhythm like sustained ventricular tachycardia.