In 1969, after lengthy administrative proceedings in which AT & T and the other general service carriers opposed MCI's application, the FCC approved MCI's proposal.Microwave Communications, Inc.,18 F.C. C.2d 953, 966 (1969); 21 F.C.C.2d 190 (1970).^[12]The FCC's decision specifically authorized MCI to provide only point-to-point private line service not requiring connection to the nationwide switched networkthat is, tie lines that would connect two or more locations without the use of switching machines. 18 F.C.C.2d at 953-54. The FCC also retained jurisdiction to order appropriate local interconnections.

TheMCIdecision resulted in a deluge of new applications to the FCC for authority to construct and operate facilities for specialized common carrier services. MCI filed applications for authority to provide specialized services among more than 100 cities. Other companies filed similar applications,

Question 1

What are the clinical features of a ruptured sinus of Valsalva?

Question 2

Does dobutamine (dose range 2.5-10 g/kg/min) cause significant

tachycardia?

Question 3

Are beta-blockers indicated in heart failure; if yes, in all cases or in

selected cases?

Question 4

Why does long-term treatment by digitalis cause gynaecomastia?

Question 5

Why do toxic doses of digoxin (which cause a decrease in excitability of

cardiac tissue) cause arrhythmias, whereas therapeutic levels of digoxin

(which cause increase in excitability) cause no arrhythmias?

Question 6

Hypokalaemia is one of the complications of digitalis. In treatment

we give K. How does the hyperkalaemia enhance the digitalis

toxicity?

Question 7

Why should we measure serum potassium before we start digoxin?

Question 8

The intravenous administration of loop diuretics such as furosemide

relieves pulmonary oedema rapidly. Is this due to arteriolar

vasodilatation reducing afterload which is an action that is independent

of its diuretic effect? I ask this because I have been told that this drug has

no effect on arterioles (except on efferent arterioles of the kidney), but

rather a venodilatatory effect. What could be the cause of such different

opinions?

Question 9

There have been a number of recent publications concerning aspirin

versus warfarin trials. Would you recommend prescribing warfarin for

secondary prevention of coronary heart disease in patients suffering from

their first myocardial infarction (MI)?

Question 10

Is it true that in future the ApoA : ApoB ratio will be used to predict

the risk of coronary artery disease more efficiently than low-density

lipoprotein (LDL)?415013