Which letter in the figure identifies the cardiac cells through which there is a 100-ms delay?
a. A c. C
b. B d. D
ANS: D
As the electrical impulse travels through the atrioventricular node, there is a 100-ms delay in the conduction. This allows the atria to become fully depolarized and contract before ventricular ex-citation begins. This allows the atrial contraction and emptying to contribute optimally to ventric-ular filling.
You might also like to view...
What is the major role of the phosphate buffer system?
A) Stabilization of urine's pH B) Stimulating a chloride shift in the ECF C) Promotion of the glycolysis process D) Oxidation of all free radicals
Acetylsalicylic acid is better known by what trade name?
A) Adenocard B) Aspirin C) Adenosine D) Amiodarone
Describe, in order, the type of treatment that should be given to this patient.
A 35-year-old female patient presents with a negative medical history. She has come to the office to have an amalgam placed in tooth number 20. Once seated in the dental chair, the patient begins to talk rapidly and clutches the arms of the chair. She admits no fear of the dental procedure but appears to be very nervous, then she begins to breathe rapidly and complains of tightness in her chest and a feeling of suffocation. She is hyperventilating. What will be an ideal response?
Which of the following organizations provides pharmacy resources such as the "Do NOT Crush List"?
USP TJC ISMP DEA