18/03/2019

# 商业文章代写：为什么要测量心率

The average number of rhythmic contraction of the heart per minute is known as heart rate. Resting heart rate is usually between 60 to 100 beats per minute. ECG is an effective tool used to deduce abnormal heart rates and find out underlying conditions. Prominent u waves in ECG are definitive indicator for Sinus Bradycardia (Opie, 2004). This is an underlying association that indicates haemodynamic compromise. This chronic case of Sinus Bradycardia that has been severe could be the reason for the patient’s general fatigue and tiredness. Isoproterenol has been administered for this condition. In an ECG the pacemaker sites can be easily found. Atrial and ventricular spacing can be found on the ECG. Effective pacemaker is usually found subsequent to the pacing stimulus spike that is followed by the QRS complex in the sinus rhythm (Ellestad, 2003). From this the normal and abnormal pacemaker can be comprehended. Mean arterial pressure is derived from systolic and diastolic blood pressure in the heart. It is calculated as an average between cardiac output (CO) and systemic vascular resistance.

It is usually in the rage of 70 -100 Hg (Ellestad, 2003). It is imperative for MAP values to be within the average range (Ellestad, 2003). It means that the vital organs of the body are receiving lesser than required oxygen. Lowering of the MAP values in the patient could lead to hypoxia or Cardiac Ishmeia. The active sites which isoproterenol acts are inside tunica media of arterioles. Specifically they simulate the action of beta1- and beta2-adrenergic receptors in the smooth muscles of the heart (Markel et al., 1993). Overall effect of this action is that β2 receptor’s vasodilation causes impact and changes the mean systemic arterial pressure.Isoproterenol drug acts as a sympathomimetic in the heart (Markel et al., 1993). That is they function as an agonist found in the sympathetic nervous system that mimics the mechanism of action of catecholamine (Markel et al., 1993).