Cardiology Flashcards
What is chronic mesenteric ischemia ?
Intestinal angina. Narrowing of the mesenteric blood vessels by atherosclerosis. This results in intermittent abdominal pain, when the blood supply can not keep up.
What triad of symptoms are involved in chronic mesenteric ischemia ?
- Central colicky abdominal pain after eating lasting 1-2 hours.
- Weight loss due to food avoidance
- Abdominal bruit
What is the gold standard diagnostic investigation for chronic mesenteric ischemia ?
CT angiography
How is chronic mesenteric ischemia managed non surgically ?
- Reduction of modifiable RF (CV RF)
- Secondary prevention (Statins and antiplatelet to break down clots)
How is chronic mesenteric ischemia managed surgically ?
Per-cutaneous mes-enteric artery stenting or open surgery
What is acute mesenteric ischemia ?
Typically caused by a rapid blockage in blood flow through the SMA. This is usually caused by a thrombus that has developed inside the artery or an embolus from another site
What is one of the major risk factors for acute mesenteric ischemia ?
AF - Due to thromboembolic mobilizing down the aorta to the SMA
What are the presenting symptoms of acute mesenteric ischemia ?
- Acute
- Non specific abdominal pain that is disproportionate to examination findings.
- Nausea and vomiting
- Guarding
- Pain is disproportionate to exam finding
What are some of complications of acute limb ischemia ?
Include shock, peritonitis and sepsis, necrosis and perforation
How is acute bowel ischemia diagnosed ?
Contrast CT angiography
What will be present on blood tests in acute mesenteric ischaemia?
- High lactate
- Metabolic acidosis
How is acute mesenteric ischemia managed ?
Patients need surgery in order to remove the necrotic bowl and to remove or bypass the blood vessel. Patients have a very high mortality rate.
What diagnostic criteria defines a STEMI ?
- Complete occlusion
- Cardiac chest pain
- ST elevation
- Raised troponin
What diagnostic criteria defines an NSTEMI ?
- Abnormal ECG (Non ST )
- Raised troponin
- Incomplete occlusion/stenosis
What diagnostic criteria defines unstable angina ?
- Cardiac chest pain
- Abnormal/normal ECG
- Normal troponin
How does ACS typically present ?
- Central/LS sudden crushing chest pain
- Can radiate to the arm, neck and jaw
- Nausea, sweating, clamminess, SOB, vomiting/syncope
- Constant pain
- Often very severe
Patients may also have epigastric pain, SOB, confusion, syncope and palpitations.
What group of patients are less likely to suffer from pain during an MI ?
- Diabetics and the elderly. Females are also likley to present atypically
When should troponin be taken (time frame) in context of an MI ?
Levels typically increase 3 hours after MI begins. If mildly raised, patients will often need a 6-12 hour repeat test.
What is the most important initial investigation in an MI ?
- ECG
- STEMI - Troponin is not needed = Immediate PCI
What does ST elevation in Leads II,III and aVF indicate ?
RCA (Inferior infarc)
What does ST elevation in Leads V1-4 indicate ?
LAD infarc
What does ST elevation in leads 1, aVL and depression in v1-3 indicate ?
Left circumflex infarc (posterior)
What is the initial management for STEMI before a PCI ?
M - IV morphine for pain and vasodilation.
O - O2 therapy
A - Loading dose PO aspirin 300mg
N - Sublingual GTN
C - Clopidogrel.
What is the gold standard of treatment for a patient with STEMI ?
Primary PCI