Akshit Sharma Profile picture
Aug 6, 2018 19 tweets 25 min read Twitter logo Read on Twitter
A #tweetorial on Perioperative risk assessment for Non-cardiac surgeries for #FITsurvivalguide

⚠️NOT "clearance"!

Purpose of consult
-Evaluate pt`s medical status
-Risk assessment
-Management recs
-Treat modifiable risk factors
-"Team" approach for shared decision making
2/ Triggers for perioperative myocardial injury
-Inflammatory state
-Hypercoagulable state
-Stress state
-Hypoxic state

All predispose to ischemia and coronary thrombosis.
3/ Think about- 🤔
-Should pt have surgery? Emergent or not?
-Type of surgery and type of anesthesia?
-Functional status of the pt?
-Relevant medical hx and any ongoing cardiac sx?
-Review the meds.
-Prior cardiac w/u.

Focus on good history and PE, can save a lot of tests & 💸
4/ ACC/AHA and @escardio guidelines for perioperative risk 2014.
Very thorough and informative 📃.

Assess pt`s clinical risk
💠ACC 2009- Low, medium or high risk.

💠ACC 2014 update- Low risk ( <1% risk of MACE) or elevated risk (>1% MACE)
5/ Assessing Functional Capacity (pic below)
💠1MeT- Resting or basal oxygen consumption of a 40–year-old, 70-kg man.

Risk of surgery (pic below)
Low, Intermediate and High risk.

⚠️In RCRI, high risk includes suprainguinal vascular, intra-thoracic and –abdominal.
6/ Risk prediction models

💠Revised Cardiac Risk Index (RCRI)-simple, widely accepted
• 0-1 low risk, >1 elevated risk

• (surgicalriskcalculator.com/miorcardiacarr…)

💠ACS NSQIP Surgical Risk Calculator
• (riskcalculator.facs.org)
7/ ❌ ignore the “high risk” conditions
⚠️Recent (<30 days) or active MI, unstable or severe.
⚠️Acute decompensated HF
⚠️Severe symptomatic valvular disease
⚠️Significant arrhythmias (tachy/brady)

Consider delaying non-emergent surgery if present.
8/ Supplemental Preop testing

Remember the important DONTs
❌ECG for asymptomatic pt; low risk surgery
❌Routine eval of LV function
❌Stress test for low risk surgery
❌Routine cors angiography
9/ Preoperative revascularization

☑️Prophylactic revascularization no significant ⬇️ MACE (CARP trial below).

Who needs cath? 🤔
-Same indication if you are evaluating for non preop.
-Unstable/sx on 💊
-Stable w/ ⬆️ probability mv-CAD+/-LV dysfnctn for ⬆️risk surgery
10/ Severe VHD
Symptomatic- Rx before elective surgery

💠Symptomatic AS -⬆️ periop mortality ~10%; Rx prior to surgery
💠Severe, asymptomatic AS-acceptable risk(avoid low preload)
💠Severe MV stenosis- avoid ⬆️HR
💠AR/MR-usually well tolerated
11/ Perioperative beta-blockers (debatable topic)
☑️Continue home dose of BB.
❌Don’t start on the day of surgery.

☑️Continue if already on.
☑️Consider starting prior to vascular surgery

ASA-If prior PCI, continue ASA. Otherwise, no benefit over the placebo.
12/ Recent PCI and DAPT perioperatively

⚠️Stent thrombosis risk very high in 1st 4-6 weeks.
☑️Delay surgery for atleast 30 days (recent BMS) or 6 months (preferably 1 year; for DES)

Refer to the algorithm below.
13/ Step wise approach for evaluating a patient preoperatively
14/ Summary
☑️Risk stratify, not “clear”
☑️Use “team” approach
☑️Use risk prediction 🛠️
☑️ Obtain good history and PE
☑️Use additional testing cautiously; can delay the surgery
☑️Manage meds, anti-platelets and pts with recent PCI carefully
☑️Remember the “DONTs”

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