It’s not just blood pressure…it’s poor impulse control! dP/dt – Change in pressure per Unit of time.

It’s not just blood pressure…it’s poor impulse control!

• dP/dt– Change in pressure perUnit of time

Anti-impulse therapy• Negative inotropy (and thus rate of rise of blood

pressure, as well as mean and peak systolic pressure)• Negative chronotropy (fewer peak systolic pressures

for the vulnerable vessel to experience)• Alpha blockade (prevent compensatory

vasoconstriction)

Goal blood pressure: as low as possible without inducing organ failure….Systolic BP of 100, or MAP of 60-70.No great evidence; this would be a tough population to ethically randomize.

Pharmacologic options: with invasive monitoring

• Esmolol: Beta blocker, bolus and infusion options– 1 mg/kg (usually about 80 mg) bolus– 150-300 mcg/kg/min

• Labetalol: alpha-antagonistic properties– 20 mg IV bolus (may require up to 80 mg over 10 min)– 0.5-6 mg/min infusion

• Propranolol: 1-10 mg bolus, followed by 3 mg/hr

Others• Nitroprusside: beware cyanide toxicity (at about 500

mcg/kg). Do not use without beta-blockade (reflex tachycardia)– 0.5 mcg/kg/min, titrate in 0.5 increments to max 10 mcg/kg/min

• ACE inhibitors may be used, but given the high risk of renal failure, and unreliable gut function depending upon the course of the dissection, they would not be plan A.

• For patients who cannot tolerate beta blockers, non-DHP calcium channel blockers (verapamil or diltiazem) are viable options.

• 4. Quit eating fast food and check into rehab. Again.

Classification systems for Thoracic Aortic Dissections

• Time course: Acute vs. Chronic• Anatomical: Ascending, descending or both• Stanford: – Type A: Involving the ascending aorta (with or without

descending aortic involvement)– Type B: Involving only the descending aorta

• De Bakey:– I: Ascending and Descending aorta– II: Ascending Aorta only– III: Descending Aorta only