A middle-aged man presented with profound shock and chest pain. Systolic blood pressure 50~70 mmHg. Here is the 12-lead ECG. 

 

 

 

 

1. What is the ECG findings ?

 

Here is his right side ECG :

2. What is the culprit vessel ?
3. How to explain his profound shock ?



" We found a strong association between survival outcomes and increased compression depth but no clear evidence to support or refute the 2010 recommendations of >50 mm. "

不管多努力, 壓胸仍是不够深, 壓胸的時間還是太少, 但至少正在壓的時候速度是够的.
可是, 不管高矮胖瘦都要至少5公分嗎 ?

What is the role of chest compression depth during out-of-hospital cardiac arrest resuscitation?   Crit Care Med. 2012 Apr;40(4):1192-8.

Abstract

BACKGROUND:

The 2010 international guidelines for cardiopulmonary resuscitation recently recommended an increase in the minimum compression depth from 38 to 50 mm, although there are limited human data to support this. We sought to study patterns of cardiopulmonary resuscitation compression depth and their associations with patient outcomes in out-of-hospital cardiac arrest cases treated by the 2005 guideline standards.

DESIGN:

Prospective cohort.

SETTING:

Seven U.S. and Canadian urban regions.

PATIENTS:

We studied emergency medical services treated out-of-hospital cardiac arrest patients from the Resuscitation Outcomes Consortium Epistry-Cardiac Arrest for whom electronic cardiopulmonary resuscitation compression depth data were available, from May 2006 to June 2009.

MEASUREMENTS:

We calculated anterior chest wall depression in millimeters and the period of active cardiopulmonary resuscitation (chest compression fraction) for each minute of cardiopulmonary resuscitation. We controlled for covariates including compression rate and calculated adjusted odds ratios for any return of spontaneous circulation, 1-day survival, and hospital discharge.

MAIN RESULTS:

We included 1029 adult patients from seven U.S. and Canadian cities with the following characteristics: Mean age 68 yrs; male 62%; bystander witnessed 40%; bystander cardiopulmonary resuscitation 37%; initial rhythms: Ventricular fibrillation/ventricular tachycardia 24%, pulseless electrical activity 16%, asystole 48%, other nonshockable 12%; outcomes: Return of spontaneous circulation 26%, 1-day survival 18%, discharge 5%. For all patients, median compression rate was 106 per minute, median compression fraction 0.65, and median compression depth 37.3 mm with 52.8% of cases having depth <38 mm and 91.6% having depth <50 mm. We found an inverse association between depth and compression rate ( p < .001). Adjusted odds ratios for all depth measures (mean values, categories, and range) showed strong trends toward better outcomes with increased depth for all three survival measures.

CONCLUSIONS:

We found suboptimal compression depth in half of patients by 2005 guideline standards and almost all by 2010 standards as well as an inverse association between compression depth and rate. We found a strong association between survival outcomes and increased compression depth but no clear evidence to support or refute the 2010 recommendations of >50 mm. Although compression depth is an important component of cardiopulmonary resuscitation and should be measured routinely, the most effective depth is currently unknown.

ATLS Primary Survey

Primary Survey

1. Airway Maintenance with Cervical Spine Protection

• "Airway Obstruction"
• Airway Manipulation
• check for FB and related fractures
• repeated assessment
• cervical spine immobilization-manual in line stabilization (MILS)

  
Comparison of cervical spine stabilization

2. Breathing and ventilation

• "Tension Pneumothorax"
  "Massive Hemothorax"
  "Open Pneumothorax"
  "Fail Chest with Pulmonary Contusion"
• Needle decompression, tube thoracostomy

3. Circulation with hemorrhage control

• Cardiac Tamponade
• blood volume and cardiac output-level of consciousness, skin color, pulse
• bleeding- SCALPeR
• Two large-caliber IV catheters, rate of infusion related to the internal diameter of the catheter and inversely by its length (not by the size of the vein)

  "Are 2 smaller intravenous catheters as good as 1 larger intravenous catheter?"

• IV solutions warmed or storage in 37~40 degree Celcius; high-flow fluid warmer for crystalloid fluids to 39 degree Celcius but blood product should not be warmed in a microwave oven.

4. Disability (Neurologic evaluation)

• Level of consciousness
• pupillary size and reaction
• lateralizing signs
• spinal cord injury level
• cerebral oxygenation/perfusion VS direct cerebral injury

5. Exposure/environment control