First,
you receive a phone call from the hospital. The officials reveal to you that
your loved one has been pronounced dead. What would your reaction be if 2 hours
later, the doctor calls you again to tell you that your loved one back alive?
Puzzled? Numb? Going to get a second doctor’s opinion whether your loved one is
really alive or dead by checking the name once again? Simply overjoyed? Call
the doctor again and ask him to use a different stethoscope? Or maybe, call all
your friends and relatives to have a “Welcome back, party?”.....Well, a series of perplexed thoughts are
sure to run wild in our thoughts if this happens to our families. Of course,
the variations, your heart beat rate and the intensity differs from
individuals.
Imagine
the joy, of having to call out your relatives and friends again to notify that
your loved dead is back from the dead. As for their reaction, your guess is as
good as mine. After all, some would still want to see him/her and pat on the
back and may want to say, “Hey, your lifeline has just been renewed and
extended for an indefinite period of time, don't screw up your life and health
with your second chance.”
...It’s called the
Lazarus Phenomenon (sometimes called Lazarus syndrome) , and goes to prove what
a fantastic machine the human body really is.
What is Lazarus Phenomenon?
The Lazarus phenomenon is described as delayed “Return Of
Spontaneous Circulation” (ROSC) after cessation of cardiopulmonary
resuscitation (CPR). This was first reported in the medical literature in 1982,
and the term Lazarus phenomenon was first used by Bray in 1993. The term
was coined from the story of Lazarus, who was resurrected by Jesus Christ
four days after his death.
Even though Lazarus phenomenon is rare, it is probably
under reported. There is no doubt that Lazarus phenomenon is a reality but so
far the scientific explanations have been inadequate. So far the only plausible
explanation at least in some cases is auto-positive end-expiratory pressure
(PEEP) and impaired venous return. In patients with pulseless electrical
activity (PEA) or asystole, dynamic hyperinflation should be considered as a
cause and a short period of apnoea (30-60 seconds) should be tried before
stopping resuscitation. Since ROSC occurred within 10 minutes in most cases,
patients should be passively monitored for at least 10 minutes after the cessation
of CPR before confirming death.
Case Report
A 66-yr-old man, weighing 80 kg, was emergently brought to the operating
room (OR) with a suspected leaking abdominal aortic aneurysm. His past history
included hypertension and a transient ischemic attack 4 yr earlier. He also had
a 50-pack/yr smoking history and chronic renal insufficiency (creatinine 2.3
mg/dL). He had no history of metabolic disorder. He had received 2600 mL of
lactated Ringer’s solution before arrival in the OR. Vital signs on arrival included
a heart rate of 120 bpm and a systolic blood pressure of 60 mm Hg. The patient
was pale, mottled, diaphoretic, and tachypneic. Rapid administration of warmed
IV fluids via two rapid infusion systems increased his systolic blood pressure
to 120 mm Hg.
Induction of anaesthesia
proceeded uneventfully with d-tubocurarine 3 mg, fentanyl 250 μg, etomidate 20 mg, and succinylcholine 160 mg IV before rapid sequence
endotracheal intubation. Maintenance of anesthesia included inhalation of
isoflurane (as tolerated by blood pressure) in 100% oxygen. Pancuronium 6 mg
was given for continued neuromuscular blockade. With induction of anesthesia,
the vital signs remained stable (systolic blood pressure 110–120 mm Hg by
automated cuff pressure) and surgical incision promptly followed at 5.30 p.m.
An arterial blood gas drawn at this time revealed hemoglobin 8.1 g/dL, K+ 3.8 mEq/L, glucose 185 mg/dL, pHa 7.24, PaCO2 41 mm Hg,
PaO2 479 mm Hg,
HCO316 mEq/L, and base excess −10.6 mEq/L. At this time,
the end-tidal CO2 was 29 mm Hg.
Electrocardiogram (ECG) showed a cardiac rhythm of sinus tachycardia.
At 5.48 p.m. the surgeon placed a
cross-clamp across the suprarenal aorta. This led to an increase in systolic
pressure to 160 mm Hg, but no apparent changes on the ECG. At 5.53 p.m. the
clamp was shifted to an infrarenal position. At 5.59 p.m., the cardiac rhythm
suddenly deteriorated into ventricular tachycardia, which rapidly progressed to
ventricular fibrillation. Chest compressions were initiated, and the patient
was ventilated with 100% oxygen. This resuscitation continued for the next 17
min during which time the patient received a total of nine countershocks of 360
J each. Additionally, a total of 5 mg of epinephrine, 4 mg of atropine, 2 g of
CaCl2, 400 mg of lidocaine, 150 mEq of NaHCO3 and 2 g of MgSO4 were given IV. Chest
compressions were initially thought to be effective as the end-tidal CO2was maintained at 25–32 mm Hg. No arterial line was
yet available to observe a waveform or to draw blood gases, and no single-stick
arterial blood gas was drawn during the resuscitation. Despite the
resuscitation efforts, the underlying rhythm continued to be asystole. This was
confirmed by the palpation of a flaccid and pulseless (in the absence of chest
compressions) proximal aorta. End-tidal CO2 had
diminished to 8–10 mm Hg, and the pupils were widely dilated. Because of the
patient’s complete lack of response and the apparent deterioration by end-tidal
CO2, the attending surgeon and anesthesiologist
mutually agreed to discontinue the resuscitation. The patient was pronounced
dead at 6.17p.m.
With cessation of the
resuscitation, the IV medications and infusions were discontinued. The monitors
were turned off, and the ventilator was disconnected although the endotracheal
tube was left in situ. The surgeon stayed at the operating table,
using the opportunity to teach residents and students. At 6.27p.m., 10 min
after the pronounced death of the patient, the surgeon announced that he had
begun to feel a pulse in the proximal aorta above the level of the aortic
cross-clamp. Ventilation with 100% oxygen was recommenced and revealed an
end-tidal CO2 of 29 mm Hg. The ECG was reconnected and
showed a sinus rhythm of 90 bpm. Systolic blood pressure was 90 mm Hg by
automated cuff. A radial arterial line was now inserted successfully, and at
0630, arterial blood gases were: hemoglobin 9.5 mg/dL, K+ 3.5 mEq/L, glucose 323 mg/dL, pHa 7.17, PaCO2 54.4 mm Hg,
PaO2 438 mm Hg,
and base excess −8.0 mEq/L. An esophageal temperature probe was inserted and
measured 33.4°C. It was decided to proceed with the operation although
neurologic prognosis was anticipated to be bleak. The patient was
hemodynamically stable throughout the remainder of the procedure, requiring no
inotropic support. Total fluid administration for the operation was 16 U of
packed red blood cells, 8 U of fresh frozen plasma, 20 U of platelets, and 12 L
of crystalloid solutions. Despite warming of all IV fluids and blood products
and the use of a forced air warming blanket, the patient’s temperature ranged
between 33° and 34°C for the remainder of the operation. The leaking aneurysm
was resected uneventfully and the patient was transported to the intensive care
unit.
Postoperatively, the patient was maintained on mechanical ventilation
for several days in the intensive care unit. The postoperative course was
complicated by mild renal insufficiency and two bouts of atrial arrhythmias
(both of which were self-limiting). Remarkably, the patient improved
dramatically and, after tracheal extubation, was found to be completely
neurologically intact. He appeared to have no short- or long-term memory
deficits. He also had no recall of any events of the day of operation except
for being initially brought into the OR.
He was discharged home on postoperative Day 13 in excellent condition
with no apparent neurologic deficit. Follow-up at 5 wk revealed that the
patient had fully recovered, and had resumed full physical activities and his
lifestyle of prior to the surgery.
PROPOSED
MECHANISMS
The exact mechanism of delayed ROSC is unclear and it is possible that more
than one mechanism is involved. Dynamic hyperinflation of the lung causing
increased positive end expiratory pressure (PPEP) is one of the proposed
mechanisms, which has some supporting evidence in patients with obstructive
airways disease.
Positive end
expiratory pressure
Rapid manual
ventilation without adequate time for exhalation during CPR can lead to dynamic
hyperinflation of lungs. Dynamic hyperinflation may lead to gas trapping and an
increase in the end-expiratory pressure (called auto-PEEP) leading to delayed
venous return, low cardiac output and even cardiac arrest in patients with
obstructive airways disease.
The link between
mechanical ventilation of patients with obstructive ventilatory defects and
circulatory failure was first demonstrated in 1982. One report describes a patient with
respiratory failure due to asthma whose blood pressure was undetectable five
minutes after initiating artificial ventilation with a tidal volume of 700 mL
and respiratory rate of 25 breaths per minute. Even after inotropes the
systolic blood pressure did not exceed 70 mm Hg. The ventilator was adjusted to
a respiratory rate of six breaths per minute and a tidal volume of 400 mL and
the blood pressure gradually rose to 126/84 mm Hg.
The physiology of
severe auto-PEEP is similar to pericardial tamponade, where circulation can
only be restored after removing the obstacle to cardiac filling. Auto-PEEP is a
possible cause of pulseless electrical activity (PEA), and rapid ventilation
during CPR should be avoided. Hypovolaemia and decreased myocardial
contractility could exaggerate its effect on venous return and cardiac output.
Some authors recommend discontinuing the ventilation transiently for 10 to 30
seconds in PEA to allow venous return.
It is tempting to apply this theory even to patients without obstructive
airways disease. Dynamic hyperinflation can theoretically happen in any
situation where rapid manual ventilation is carried out. One could argue that
in the presence of decreased cardiac output—as in myocardial infarction and
hypovolaemia—dynamic hyperinflation could compromise the cardiac output even
more, leading to cardiac arrest.
Even though
auto-PEEP due to dynamic hyperinflation seems most plausible and has some
evidence in patients with obstructive airways disease, this alone would not
explain all cases of delayed ROSC. In one report, CPR was terminated after 30
minutes and the patient was in asystole. Because the patient had MRSA and CPR
was performed without proper infection control measures, the physician involved
in the CPR went to shower and change clothes, leaving the patient still being
ventilated in the intensive care unit. Returning five minutes later, he found
the patient with a perfusable rhythm. The patient died two days later.
Delayed action of
drugs
Some authors
suggest delayed action of drugs administered during CPR as a mechanism for
delayed ROSC. It is possible that
drugs injected through a peripheral vein are inadequately delivered centrally
due to impaired venous return, and when venous return improves after stopping
the dynamic hyperinflation, delivery of drugs could contribute to return of
circulation. In some cases, however, drugs are actually administered through a
central line. Even though this theory is plausible it would be impossible to
either prove or disprove.
Hyperkalaemia
There are few
reports of delayed ROSC in the presence of hyperkalaemia. It is a well-known fact that
intracellular hyperkalaemia could persist longer, rendering the myocardium
retractile for long periods of time. There is a report on a 68-year-old lady
with cardiac arrest due to hyperkalaemia who did not respond to CPR and
conventional treatment up to 100 minutes, but later responded to dialysis and
made a complete recovery. So even
though prolonged cardiac arrest refractory to conventional treatment could
respond to dialysis, it is unlikely that hyperkalaemia on its own could explain
delayed ROSC after cessation of CPR.
Myocardial stunning
Prolonged
myocardial dysfunction can occur following myocardial ischaemia, taking up to
several hours before normal function returns. Of
the 38 cases, 13 had myocardial infarction, and at least seven had hypovolaemia
which could have contributed to transient myocardial ischaemia and stunning.
Transient asystole
Asystole or PEA
following countershock of prolonged VF is common and occurs in around 60% of
patients. Even though restoration
of circulation occurs in 16% of patients, the prognosis is poor: only 0-3% are
discharged alive. It is possible that asystole or PEA after countershock could
be transient before a perfusable rhythm restores circulation. Transient asystole
following defibrillation would explain at least one case, where CPR was
interrupted after a last cardioversion attempt resulting in asystole, and ROSC
occurred soon after. However,
transient asystole would not explain delayed ROSC in majority of patients in
whom the duration of asystole was much longer. In another case, CPR was stopped
while the patient was still in ventricular fibrillation and haemodynamic
activity returned few moments later. The
authors of the case rightly point out that CPR should not be halted in a
patient with ventricular fibrillation.
CONSEQUENCES
OF DELAYED RETURN OF SPONTANEOUS CIRCULATION
Delayed ROSC
can lead to serious professional and legal consequences. Questions will be
asked about whether CPR has been conducted properly and whether it was stopped
too soon. The medical team might be accused of negligence and incompetence and
even be sued for damages if a patient survives with severe disability. A doctor involved in resuscitation and
certification of death followed by delayed ROSC has recently been accused of
culpable homicide.
The conduct
of ALS can only be assessed from the case record, so it is vital to record the
events during cardiac arrest as accurately as possible. When to discontinue CPR
is still a medical decision and so it is absolutely essential to get a
consensus from the arrest team and to document the reason for termination of
CPR. Some authors recommend measurement of end-tidal carbon dioxide during CPR.
Values above 10-15 mmHg indicate a favourable prognosis and should preclude
termination of CPR. This technology is not widely
available outside the intensive care setting, but should be considered in
difficult clinical situations. Whether this would identify patients in whom
delayed ROSC might occur is nevertheless questionable.
HOW WOULD ONE
RECOGNIZE DEATH?
It is
important to realize that death is not an event, but a process. The conference
of Medical Royal Colleges in the UK advocated that death is a process during
which various organs supporting the continuation of life fail. Cessation of circulation and respiration is such an
example. The physical findings to support this—absence of heartbeat and
respiration—are the traditional and the most widely used criteria to certify
death. Since these findings alone are not a sign of definitive death, it is
quite possible to declare death in the interval between cessation of CPR and
delayed ROSC.
Because delayed ROSC occurred within 10 minutes in most cases, many authors recommend that patients should be passively monitored for at least 10 minutes following unsuccessful CPR. During that period the family should be informed that CPR had been stopped because of poor response and further efforts are not in the best interests of the patient. It should also be mentioned that the patient is being closely monitored to establish death beyond any doubt. Death should not be certified in any patient immediately after stopping CPR, and one should wait at least 10 minutes, if not longer, to verify and confirm death beyond doubt. This is in line with what was said by W H Sweet in 1978:‘ the time honoured criteria of the stoppage of the heart beat and circulation are indicative of death only when they persist long enough for the brain to die.
NON-MEDICAL
LITERATURE
Newspapers
In addition to
medical literature, there are many newspaper articles, websites and a few
anecdotes in medical journals describing patients who were certified dead, but
later found to be alive. Many of these articles refer to these incidents as
‘Lazarus phenomenon’. There is even a movie called Lazarus
phenomenon describing
two cases of resurrection after death. However, the authenticity of one of
these cases has been questioned.
Websites
A website (www.snopes.com/horrors/gruesome/buried.asp) describing
people who have been buried alive by mistake in the last few centuries provides
entertaining reading. In olden days a number of illnesses could cause coma and
there was a danger of hasty disposal of the body especially in those with
infectious diseases.
Literature
Edgar Allan Poe's
most hair-raising tale is The Premature Burial, in which a young wife was
incorrectly pronounced dead and kept in a coffin in the family vault. When the
vault was opened a few years later to receive another coffin, a shrouded
skeleton was found in the doorway suggested that the lady had survived and
eventually died unable to open the vault door. It is believed that he based his
story on a widely reported incident that took place around that time.
It seems that the chances of being buried alive were not so remote in
1800s. The fear of being buried alive was so prevalent that many people
specified in their wills that tests must be carried out to confirm their death,
such as pouring hot liquids on the skin, touching the skin with red-hot irons,
or making surgical incisions prior to the burial. A coffin was invented and
patented in 1897 to allow a person accidentally buried alive to summon help
through a system of flags and bells. The fear of being buried alive is called
‘taphophobia’ in the medical literature. There was even a Society for the
Prevention of Burial Before Death, which recognized the difficulties in
diagnosing death and issued educational leaflets to assist members of the
society.
LAZARUS IN
OTHER CONTEXTS
The term
Lazarus has also been used to describe many other unexpected and scientifically
unexplainable phenomena. Lazarus complex describes the psychological sequence
in the survivors of cardiac arrest, near-death experiences and unexpected
remission in AIDS. Lazarus
syndrome is described in paediatric palliative care, when a child is expected
to die but unexpectedly goes into remission. Spontaneous
movement in brain dead and spinal cord injury patients has been described as
Lazarus sign. Survival of species
after mass extinction has been called Lazarus effect. The term Lazarus phenomenon was also
used for unexpected survival of renal graft patients.
Lazarus
premonition describes an unexpected state of brief resurrection in terminally
ill patients, when they experience an increase in vitality, appetite and
general improvement. This was
recognized at least a thousand years ago in the medieval Chinese literature and
was described as hui guang fan zhao, meaning reflected rays of setting
sun. Recently a ‘Lazarus Pill’ (Zolpidem, a non-benzodiazepine sedative) has
aroused medical interest in patients with persistent vegetative state. This was
following a report where a patient with persistent vegetative state showed a
brief remarkable neurological response to zolpidem.
RESURRECTION
There are
many other resurrections in addition to that of Lazarus. Three resurrections
are recorded in the Old Testament, one each by Elijah, Elisha and Elisha's
bones. There are many resurrections in the New Testament, four by Jesus
(including Lazarus) and one each by Paul and Peter. In Hindu mythology Sathyavan's wife
Savithri convinces the Lord of death (Yamaraj) to resurrect Sathyavan following
his death after being caught under a falling tree. These stories illustrate
that humanity's preoccupation with death and resurrection is universal. The
greatest example of Lazarus phenomenon is probably the death and resurrection
of Jesus Christ himself.
KEY POINTS
·
Lazarus phenomenon is described as delayed ROSC after cessation of CPR;
·
Dynamic hyperinflation should be considered as a reversible of cause of
PEA;
·
Patients should be observed for at least 10 minutes using blood pressure
and ECG monitoring after the cessation of CPR before confirming death.