To die in one's sleep. . . so basic to the cauldron of human fears,
subject matter to ancient rhymes and holy sonnets, the arts and literature,
laden with layers of mythology, coloring folklore with creatures of
the night, concoctions of superstitions, and nostrums of nightmare
preventions. Cloaked in mystery and dread, it has acquired a motley
of names and acronyms – Sudden Unexplained Death Syndrome. SUDS,
Sudden Unexpected Death in Sleep, Sudden Unexplained Nocturnal Death
Syndrome, SUNDS, nightmare deaths, sudden night deaths
– as science pokes through the muddle of myth and folklore,
searching for etiologies and pathogenesis that can shed light into
this mysterious fatal affliction that visits presumably healthy young
men in their sleep, more commonly in the Southeast Asian and Pacific
Rim countries and Polynesian populations believed to have migrated
from South East Asia centuries ago.
First reported in the Philippines in 1917, 'sudden
night deaths' or SUDS (sudden Unexpected Death in Sleep) has been
attributed to bangungot (bangungut
- from the Tagalog root words of "bangon" (to rise) and
"ungol" (to moan). It is a syndrome wrapped in folklore
and myth, that consists of a nightmare, commonly occurring in nocturnal
sleep, frequently after a heavy meal that is often accompanied by
alcohol, most often in young males, aged 25-44, presumably healthy,
without any known cardiac illness.
A heavy meal
Presumably healthy with
no prior heart problems
of unexpected death
the Philippines, bangungut (SUDS) has been so linked to gluttonous
eating and bacchanalian drinking, to the exclusion of other symptoms
or warning signs. Fainting and family history do not raise red
flags. But South East Asian studies suggest that a history of
fainting with a positive family history increases the chance
of dying of SUDS in the next five years.
A review of SUDS cases (Munger and Booton) from Death Certificates
filed in Manila during 1948-1982 showed the same characteristics:
96% male, mean age 33 years, modal time of death 3:00 a.m. The
deaths were seasonal, peaking in December-January, and the SUDS
victims were more likely than diseased controls to have been born
outside of the Manila area.
A 2003 UP health survey on SUDS among young Filipinos reported
43 deaths per 100,000 annually.
How often bangungut becomes fatal is unknown. Many cases are never
reported, especially in the rural areas where dying in your sleep
is an accepted event in the folklore of death. Many know others who
died in their sleep. Many more are 'survivors' of one or more attacks,
with descriptive details of bangungot -type nightmares– of sleep
paralysis, of falling from a mountain or into a deep abyss, of the
creature in the dark standing by the bedside. How many of these are
actually near-death or near-bangungut experiences or are they merely
generic ingredients to culture-flavored nightmares?
|Note: I have to begrudge the Ilocandia
myth makers. Why the need to invent "Batibat?"
To die in a bangungut nightmare is uugghh-dreadful enough.
But to die with the the fat and vengeful "batibat"
seating on your face. Oh, mercy me.
"Batibat" clay sculpture
by Alvin Barcelona, Brgy. Lumingon, Tiaong, Quezon (4"x5")
Although there are witness reports of "moaning, groaning, gasping,
choking, frothing, and labored breathing," as often, patients
are found dead, in seeming peaceful slumber, without the sounds of
terror or any evidence of a terminal struggle.
In a "macho-culture" with a penchant
for drinking, often to oblivion, and accompanying this libatory indulgence
with a smorgasbord of "pulutan," pancreatitis became the
popular and preferred "point-to diagnosis." (see pancreatitis,
In a country with more than 7000 islands and more
than 70 indigenous communities, where albularyos and medicos minister
to the end-days, diagnosing fainting spells by tawas
and treating them with a bulong and/or orasyon,
where the night worlds are ruled by the frightful creatures of myths
and superstitions – the tikbalangs, kapres, asuwangs, white
ladies and pontianaks, where death's ways are accepted with funereal
fatalism as God's will, karma, or bangungut. — alas, the true
incidence of bangungut / SUDS is probably a-long-time-coming before
it gets revealed to the scrutiny of science.
THE OLD AND THE NEW
Inevitably, science went forging
and fishing into the sea of folklore and myths. In the recent decades,
battling through ghouls and night hags, armed with the old and new
tools of technology and the disciplines of research, digging into
new world of genetic mutations, it has emerged partially victorious,
providing us alternatives to the old and overused pancreatitis-diagnosis,
with new theories and etiologies — the Why-What-and-How of
unexpected sudden nocturnal deaths, and further adding to its lengthening
lists of acronyms and syndromes (SADS: Sudden Arrhythmia Death Syndrome
from Brugada, the Long QT, or Short QT syndromes).
THE OLD . . .
In the Philippines, the cause of
SUDS / bangungut has been linked to acute hemorrhagic pancreatitis
attributed to a hearty or gluttonous meal often downed by a hefty
amount of alcohol. A high salt diet, contributed to by native condiments
- patis and bagoong - has been implicated. Stories
are told of bangungut attacks with the combined indulgence of beer
|As the sole cause of
bangungut, pancreatitis is a hard-sell. Especially if caused by
excessive alcohol use, acute pancreatitis is rarely, if ever "silent,"
but rather quite dramatic and severe in its presentation, more
likely to present itself with more than an "ungol" (groan).
PANCREATITIS is the inflammation of the pancreas,
the gland that sits behind the stomach, concerned with digestive enzyme
functions and production of insulin. It is connected by a ductal system
to the liver and the gallbladder, an anatomic detail of concern in
gallstone disease. Pancreatitis can be either acute or chronic. In
acute pancreatitis, there may be a history of excessive alcohol intake
or a heavy meal preceding the attack or a history of biliary colic
(gallstones) in the past. The rest are due to infections, vasculitis,
drugs, trauma, hypercalcemia, hypertriglyceridemia. Although occasionally
mild, often the symptomatology is rather dramatic in acute pancreatitis,
with nausea, vomiting, fever, abdominal pain, distention, sweating,
rapid pulse,and shock.
Clinically, it is a hard-sell of a diagnosis
if it is to be solely implicated for cause of bangungut deaths.
As mentioned, attacks of acute pancreatitis have a rather dramatic constellation
of symptoms, running the course of hours to days, with a severity
that forces the patient to seek help or medical attention. Of course,
the pancreatitis could have been "silent" if the alcohol
was used in 'overdose' amounts, enough to cause respiratory depression,
seizures, shock, coma, and death.
Still, it will not explain the many
cases of "bangungut" deaths in the seemingly "peaceful"
scenarios of dying. Also, there are many similar "night deaths"
where autopsies failed to show any pathologic cause. And for these,
the usual fall-back is the waste-basket diagnosis of "cardio-respiratory
However, although pancreatitis per se is the unlikely pathogenic etiology, alcohol is included in the substances that may unmask or modulate the pathologic and potentially lethal EKG manifestations of lead to sudden cardiac death. (See below)
. . . AND THE NEW
Brugada & QT Syndromes:
The long and short of it
human body has a system of quasi independent electrical circuits that
can be recorded through medically dedicated tools: the EMG-NCS (electromyography
for muscle and nerve conduction studies), the EEG (electroencephalography
for the study of brain waves) and the EKG or ECG (electrocardiography
for a print out of the heart's electrical rhythm). Fascinating, all
– electrical systems working in unison, with an endogenous power
source that usually lasts a "lifetime of average use and abuse."
Of these, it is the EKG that can provide information critical to the
immediate assessment and management of life-and-death
attacks and potentially fatal cardiac irregularities. To boot, it
can provide clues of rhythm disturbances and
PQRST-wave configuration abnormalities that can alert the astute clinicians
into raising red-flags, recognizing and preventing potential problems.
The ECG has been the gateway tool in the diagnoses of clinical entities
constituting a group called SADS (sudden
arrhythmia death syndrome) recognizable by its potentially fatal electrocardiographic
presentations (Wolff-Parkinson-White syndrome, idiopathic ventricular
or arrhythmias caused by electrolyte imbalances). Recent studies and
discoveries have focused on emerging entities — the Brugada
syndrome, the long-QT and the short-QT syndromes — with its
hereditary genetic defects affecting the cardiac ion channels, stripping
some layers from the myths of sudden unexpected nocturnal deaths,
providing science, etiologies and treatment options.
V3 tracings compare the normal on the left with the Brugada pattern
on the right: a terminal R' wave in lead V1, a convex curve or "coved-type"
ST elevation in V1 and V2 and a saddle-shaped ST-segment elevation
1998, a hereditary (autosomal dominant) gene defect was found, involved
in the coding of protein components in the sodium channels in heart
cells. The channel defect causes abnormal electrical conduction in
the heart with resultant ventricular arrhythmias, including full-blown
ventricular fibrillation leading to death. Of the patients studied,
many presented with unexplained fainting spells.
The Brugada syndrome presents with 3 different ECG patterns. The classic
type 1 Brugada pattern consists of a right bundle branch block with
a right precordial injury pattern (ST-segment elevations that descend
and have an upward T-wave inversion ("coved type") in leads
V1 through V3). Types 2 and 3 have "saddle-back" ST-T waves,
with descending ST segments and an upright T wave; in type 2, the
T wave is upright or biphasic. A slight prolongation of the QT interval
may be noted in the right precordial leads due to the prolongation
of the action potential in the right ventricular epicardium. The Brugada
patterns differentiate from typical RBBB patterns by the absence of
widened S waves.
The classic (type 1) Brugada syndrome
presents with the coved-type ST elevation in more than 1 right precordial
lead ,V1 through V3, with or without a sodium channel blocker, with
one of the following criteria: syncope, documented ventricular fibrillation,
electrophysiologic inducibility of ventricular tachycardia, positive
family history of cardiac death younger than age 45, nocturnal agonal
respiration, self-terminating polymorphic ventricular tachycardia,
and type 1 ST elevation in family members.
|ECG patterns in Brugada syndrome. According to recent consensus document, type 1 ST segment elevation either spontaneously present or induced with Ajmaline/Flecainide test is considered diagnostic. Type 1 and 2 may lead to suspicion but drug challenge is required for diagnosis. The ECGs in the right and left panels are from the same patient before (right panel, type 1) and after (left panel, type 1) endovenous administration of 1 mg/kg of Ajmaline during 10 minutes.
|The ECG manifestations of Brugada syndrome are often dynamic or concealed and may be unmasked or modulated by sodium channel blockers, a febrile state, vagotonic agents, alpha-adrenergic agonists, beta-adrenergic blockers, tricyclic or tetracyclic antidepressants, a combination of glucose and insulin, hypo- and hyperkalemia, hypercalcemia, and alcohol and cocaine toxicity. Brugada syndrome: second consensus conference
Types 2 or type
3 Brugada syndrome presents with ST elevations: ≥1mm in type
2 and <1 mm in type 1 in more than one precordial lead, with conversion
to type 1 Brugada ECG patters after the administration of a sodium
channel blocker plus one of the type 1 criteria.
these ECG patters are rare. In Japan, it is found in less than 1%
of the population; and in the U.S.,in less than 0.5%. Of these, most
will not have any problems. But the EKG pattern, coupled with a history
of unexplained fainting, a history of a relative dying young, raises
a red-flag risk of sudden death.
In the Philippines,
a cross-sectional study done in 2003 to measure the prevalence of
Brugada type EKG pattern reported finding the Brugada type 1 (coved)
ECG pattern in 0.2% of the population and in 0.3% among males. The
prevalence of any type Brugada ECG pattern was 2%. The risk of sudden
death among individuals with this marker remains to be determined.
syndrome has been linked to SUDS, causing sudden death in apparently
healthy young people over the age 30. A study of patients with
SUNDS and their families, screened for genetic mutations in SCN5A,
the gene known to cause the Brugada syndrome, suggested that SUNDS
and the Brugada syndrome are phenotypically, genetically, and functionally
the same disorder. <http://hmg.oxfordjournals.org/cgi/content/full/11/3/337>
In Thailand, where the estimated prevalence
of SUDS is 26-38 per 100,000 population, a study on patients with
the Brugada syndrome showed a low heart rate variability at night
that may predispose to the occurrence of ventricular fibrillation
A study done to evaluate the significance
of cardiac autonomic neuropathy (CAN) in the Brugada Syndrome concluded
that CAN is an important risk factor in BS, and that men are susceptible
to the development of cardiac events.
The prognosis for high risk patients - abnormal
EKG with history of syncopal attacks or near-sudden death resuscitation
- is very poor, with a third at risk of a polymorphic ventricular
tachycardia within two years.
Brugada in Children / Alterations in Pubertal Hormonal Landscape
• Although rare in children and generally excluded from the Brugada debate, there was a report of 30 children and adolescents (≤16 years of age) diagnosed with the syndrome. 37% had Brugada-type EKG (1 cardiac arrest, 10 syncope) and the majority (60%) were asymptomatic. The children differed from adults in gender distribution - there was no obvious male predominance. Although it is genetic disorder of autosomal-dominant inheritance, with males and females expected to inherit the gene equally, in adults, aged 34 to 53, it manifests invariably male, ≥90%. The hormonal landscape attempts to explain the differences: the male testosterone might reduce inward calcium currents and facilitate onset of arrhythmia by shortening of action potential while female estradiol could be "antiarrhythmic" by modulating calcium current density. The hormonal changes in puberty and their electrophysiological effects may partly explain the increase of male occurrence after puberty.
• At present, implantation of an automatic ICD (implantable
cardioverter defibrillator) is the only treatment proven effective in treating ventricular tachycardia and fibrillation and preventing sudden cardiac death in patients with the Brugada syndrome. Risks for asymptomatic patients with typical
electrocardiographic patterns are the same; a third will develop ventricular
tachycardia or fibrillation within two years.
• Patients with Brugada syndrome and a history of cardiac arrest must be treatment with an ICD.
• Studies have suggested that asymptomatic patients with no family history of sudden death can be managed conservatively with close follow up without an ICD.
• However, another study suggested that inducible ventricular fibrillation in asymptomatic patients is an indication for ICD implantation, with the data from a single large study showing a 12% risk of spontaneous VF within 3 years of diagnosis.
• Patients with intermediate characteristics present a most difficult challenge. (Brugada Syndrome Treatment & Management)
THE LONG QT SYNDROME
Like the Brugada syndrome, with its characteristic
hereditary ion channel and ECG abnormality, hereditary prolongation
of the QT interval is also associated with SADS (Sudden Arrhythmia
Death Syndrome). LQTS is caused by mutations of the genes for cardiac
potassium and sodium ion channels. The most common type is the autosomal
dominant Romano-Ward syndrome. While it can present with syncope and
seizures, In 30 to 40 percent of patients, sudden death is the only
event. While the cardiac events are usually precipitated by physical
and emotional stress, deaths can also occur in sleep. A history of
unexplained sudden death in a young family member is a clue.
QT prolongation is characteristic and
predisposes to ventricular tachyarrhythmia – polymorphic ventricular
tachycardia, or torsade de pointes, which can lead to ventricular
fibrillation and sudden cardiac deaths. Sometimes, only a borderline
prolonged QT interval is seen. Another clue is the presence of T-wave
alternans, the severity of which correlates with cardiac events.
Some of the highest rates of inherited
long QT syndrome occurs in Southeast Asian and Pacific Rim countries.
The syndrome has more treatment options
than the Brugada syndrome: Beta blockers, potassium, avoidance of
certain drugs, permanent pacemakers, and implantable defibrillators.
THE SHORT QT SYNDROME
A relatively new syndrome, first described
in 1999, belonging to the ion-channel disorders called "channelopathies,"
hereditary short QT syndrome is an autosomal-dominant clinical-electrocardiographic
entity with associated gene mutations. It is characterized by a short
QT, frequently tall-peaked T-waves similar to a "hyperkalemic-T,"
inducible ventricular fibrillation, episodes of syncope, a high tendency
for paroxysmal atrial fibrillation or life-threatening arrhythmias,
without any underlying structural heart disease.
Three forms of the syndrome have been identified
affecting different channels. Indicated therapy for those who have
survived a cardiac arrest or those with a history of syncope, is the
implantable cardioverter-defibrillator. In its absence or inaccessibility,
drug therapy has the potential for prolonging the QT interval. However,
drug therapy has been shown to be beneficial only for the first form,
and ineffective for the other forms.
Although it has been linked to deaths in infants,
children and young adults with a family background history of sudden
cardiac death, it is possible that many survive into a later adulthood,
into the mean age of deaths linked to SUDS/ SUNDS or bangungut.
• Sudden adult
death syndrome .Dr Trisha Macnair
The Brugada type 1 electrocardiographic pattern is common among Filipinos
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