Mitchell / MD ECG in 60 Minutes Emergency & ICU

High-Stakes Pattern Recognition for ER Nurses, Critical Care RNs & Rapid Response Teams
1. Auflage 2026
ISBN: 978-643-941783-1
Verlag: Publishdrive
Format: EPUB
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 157 Seiten

For ER Nurses, ICU Nurses, and Rapid Response Teams Who Need to Read the ECG and Act - Not Just Interpret It

Most ECG books teach you what patterns look like. This one teaches you what to do when you see them - at the bedside, under time pressure, with a patient who cannot wait.

ECG in 60 Minutes: Emergency & ICU is Book 5 in the ECG in 60 Minutes series by Ryan Mitchell, MD. It is written specifically for nurses in high-acuity settings: emergency departments, intensive care units, step-down units, and rapid response teams. Every chapter is built around a clinical scenario, not an exam question. Every protocol, SBAR template, and decision algorithm is designed for direct bedside use.

Autoren/Hrsg.

Mitchell, Ryan

MD,

Leseproben

WHAT THE 60-SECOND SCAN DOES NOT DO: It does not complete the diagnosis. It identifies whether the patient needs to be pulled out of the queue and acted on NOW, before the full systematic read is finished. Every patient still gets the full 8-step method — the scan just determines whether that method happens in 10 minutes or in 60 seconds.

1.2 The Full 8-Step Read — Applied at the Bedside

The 8-step reading method was introduced in Book 1 and applied in clinical detail in Book 3 Chapter 12. This section restates it in the compressed, action-oriented format appropriate for the ED setting — each step paired with the specific bedside decision it triggers.

Step

Check

Bedside Action if Abnormal

1

Rate / rhythm

Wide-complex tachycardia ? prepare cardioversion. Pulseless ? start ACLS. Bradycardia with compromise ? atropine or TCP protocol (Chapter 2).

2

Axis

Unexpected left axis deviation in chest pain ? LAFB? Old inferior MI? Extreme axis ? lead reversal first (repeat ECG with correct lead placement before diagnosing pathology).

3

Intervals

PR > 0.20 s ? document AV block degree. QRS > 0.12 s ? STOP here, go to Step 5 (BBB check) before reading ST segments. QTc > 0.50 s ? review all medications immediately.

4

Chamber enlargement

LVH voltage criteria met ? the ST-T changes you are about to see in Steps 6-7 may be LV strain (not ischemia). Flag this before reading the ST segment.

5

QRS morphology / BBB

LBBB or paced rhythm present ? SWITCH from standard STEMI criteria to Sgarbossa criteria. Do not apply standard thresholds. Calculate the modified ratio if concordant changes are absent (Book 3, Chapter 6).

6

ST segment

Apply correct threshold (standard OR Sgarbossa depending on Step 5). Check for elevation, depression, morphology (concave vs convex), and reciprocal changes. Nitrate pause: if inferior STEMI ? V4R before NTG.

7

T waves

Hyperacute T waves ? early STEMI, may precede ST elevation. Deep symmetric V2-V3 T inversion after resolved pain ? Wellens (urgent cath, no stress test). Peaked tent-shaped T waves ? hyperkalemia (check K? immediately).

8

Clinical correlation

Does the ECG match the story? Normal ECG in a convincing clinical presentation ? serial ECGs and troponins, never discharge. Alarming ECG in a well-appearing patient ? consider lead reversal, consider strain vs ischemia.

1.3 ST Elevation Triage — STEMI vs Mimic in Real Time

When ST elevation is found in Step 6, the next 60-90 seconds should answer one question: does this represent a true STEMI requiring cath lab activation, or a mimic requiring a different response? The following checklist is designed to be worked through in order, stopping at the first definitive answer.

ST ELEVATION TRIAGE CHECKLIST — WORK THROUGH IN ORDER: 1. Is the QRS wide (LBBB or paced)? If YES ? standard criteria do not apply. Apply Sgarbossa. A positive Sgarbossa result = STEMI-equivalent; activate the cath lab. 2. Is the distribution REGIONAL (confined to a specific contiguous lead group)? If YES ? move to Step 3. If the elevation is DIFFUSE (most or all leads) ? go to Step 4 (pericarditis / Takotsubo / left main differential). 3. Are RECIPROCAL ST changes present in the mirror-image lead group? If YES ? STEMI confirmed. Activate the cath lab. If NO but distribution is regional ? proceed cautiously; still possible STEMI, but lower confidence without reciprocal changes. 4. Does the ST morphology suggest a mimic? Concave ('smiling') elevation + PR depression + NO reciprocal changes = pericarditis (NSAIDs + colchicine, not cath lab). J-point notching + concave + young asymptomatic patient = early repolarization (observation, not intervention). 5. Is the nitrate pause needed? Inferior ST elevation + RCA pattern (III > II, aVL = I reciprocal depression) ? obtain V4R before any nitroglycerin. V4R = 1 mm = RV infarction = nitrates and diuretics are contraindicated.

THE MOST COMMON BEDSIDE ERROR IN STEMI TRIAGE: Activating a STEMI alert before checking for LBBB. A patient with known or new LBBB and chest pain has an ECG where standard STEMI criteria are unreliable — both false positives (unnecessary cath lab activation) and false negatives (missed MI) result from applying standard thresholds to an LBBB baseline. Always confirm QRS morphology in Step 5 BEFORE reading the ST segment in Step 6.

1.4 The Nitrate Pause — V4R and the 30-Second Rule

Nitroglycerin is one of the most reflexively administered medications in chest pain management. In the specific scenario of inferior STEMI with RV infarction, it is one of the most dangerous. The V4R check is the single nursing action that most consistently prevents this harm — and it takes approximately 30 seconds to obtain and read.

When to Obtain V4R

• Any inferior STEMI (ST elevation in II, III, aVF) — particularly when the RCA pattern is present (III > II, reciprocal depression aVL = I).

• Any patient with inferior STEMI who is hypotensive or who becomes hypotensive after administration of a single sublingual nitroglycerin.

• Before the first nitroglycerin is administered in any inferior STEMI, as institutional protocol and best-practice standard.

How to Obtain V4R

• Place V4R at the right fifth intercostal space, midclavicular line — the mirror image of the standard V4 electrode, on the RIGHT side of the chest.

• Any of the standard limb leads (I, II, III, aVR, aVL, aVF) can serve as the V4R recording lead if a dedicated right-sided lead placement is performed. Most telemetry systems allow lead selection — use V1 position moved to V4R location.

• A positive V4R result is ST elevation = 1 mm in the right-sided lead. This confirms RV infarction. The nitrate pause is now mandatory.

V4R Result

Action

V4R = 1 mm (positive — RV infarction confirmed)

HOLD all nitroglycerin, morphine, and diuretics. Notify the physician immediately. Manage hypotension with IV fluid boluses (500 mL NS, repeat as needed). Vasopressors (norepinephrine) if fluids insufficient. Proceed with STEMI protocol (cath lab activation).

V4R < 1 mm (below diagnostic threshold)

Clinical caution still applies if the patient is hypotensive or the inferior STEMI appears large. Nitroglycerin may be given, but start at the lowest available dose, monitor BP continuously, and discontinue if BP drops = 15...