Luckily the ambulance came quickly, and Bobby Sue was brought to the ER where sh

Question

Luckily the ambulance came quickly, and Bobby Sue was brought to the ER where she was assessed for trauma. (More on this later.) Physicians were worried about a myocardial contusion or other myocardial damage, and ran an EKG. Below is an image of a 6 second strip. They checked her blood pH (7.11; low), blood oxygenation (86%, low), and body temperature (95.8 °F). The broken knees were wrapped, but surgery was put off until her metabolic condition was stabilized. After all, bones can be fixed later cells are more difficult to replace. This is termed Damage Control" in trauma: stabilize the patient, schedule major surgeries to repair massive injuries once the patient is stable. In exsanguinating hemorrhage, patients die from coagulopathy, hypothermia, and metabolic acidosis. The metabolic failure is often the terminal condition, and therefore must be dealt with immediately. (More on all of this later in the semester.)

Explanation / Answer

In an ECG,

P wave represents the atrial excitation and QRS represents the ventricular excitation.

P wave interval-0.11 sec and its amplitude:0.25mV

QRS interval-0.09 sec and amplitude :1.6 mV

In a 6 second ECG strip,heart rate can be calculated by number of R waves in the strip x 10.

Here there are 13 R waves in this strip and we will get an abnormal heart rate of 130 beats per minute(bpm)

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