IHD Flashcards
What happens in angina pectoris
Less severe ischemia and no muscle death - stable angina
What happens in MI
Death to muscle cells
Types of angina
- Stable angina (demand ischemia)
- Unstable angina (supply ischemia- thrombus)
- variant angina (prinzmetal/vasospastic)
What causes stable angina
Caused by 4Es ( exertion, emotional stress, exposure to cold/hot weather and eating heavy metal)
When does unstable angina occur
Occurs at rest or with limited physical activity
When does variant angina occur
Occurs at rest, pain at the same day with ST segment elevation and ventricular arrhythmias
What’s first line for angina relief
Short acting nitrates + B blockers or CCB to lower heart rate
- give CCB-DHP if heart rate is already low
How to prevent angina events
- Life style management and control risk factors
- also aspirin, statins and consider ACE I or ARBS
List the anti anginal drugs
- organic nitrates
- CCBs
- B blockers
List organic nitrates
Nitroglycerin And Isosorbide dinitrate -> fast duration for angina pain
Isosorbide mononitrate
Organic nitrates mechanism of action
Relax vascular smooth muscles by intracellular conversion to nitrate ions then to NO -> increases CGMP -> relaxation
Which vessels are dilated with low dose of organic nitrates
Veins
Which vessels are dilated at higher doses of organic nitrates
Arteries and arterioles
Nitroglycerin mode is administration
Sublingual -> rapid action
Give 3 doses of spray or 3 sublingual tablet during 15 mins
Nitroglycerin adverse effects
Postural hypotension tension