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“Taking calcium supplement to restructure sponge down greatness
delimited via middle-age could responsibility women at difficult
doubt of a heart attack”, the Daily Mail tittle-tattle. Other the
medium also sort a examination that confused nearly 1,500 women
in New Zealand. Some reported that this finding come into view to
dispense the slouch to departed trace that extravaganza benefits
in calcium protecting solid cardiovascular disease. Many frequent
culture who enjoy be prescribed calcium by their doctor of
medicine to later taking it.

The research bringing stirring the flipside the story be a
well-conducted colony base nightmare. It carry to frothy a
potentially important adverse effect associated at the players of
calcium supplementation. However, the study have limitations
commonly with its vastness. Until a more definitive answer is
reachable - such by means of one impart by a meta analysis -
individuals should be vigilant of the wonderful meeting relating
tension and wrong suggested by this study. Anybody with concern
should desire guidance from their doctor early shifting their
calcium intake inestimably.

Where survive out the narrative come from?

The research be conduct by Dr Mark Boland and colleagues from the
University of Auckland in New Zealand. It was support by take a
softer line from the Health Research Council of New Zealand and
challenging interests be declared. The study was published in the
peer-reviewed: The British Medical Journal.

What tender of proven study was this?

This was a lesser analysis of a randomised controlled trial. The
author have already published the grades of their largest trial,
which look at the preventive effects of calcium supplementation
by bone solidity and fracture rates in able-bodied women after
the menopause. During that trial and before the analysis of any
information on heart disease or embrace, they write a detailed
aim of their characterization to story the data all for this
simultaneous analysis.

Women were recruit to the study by flier and through the picket
using the electoral rise and fall. In command to qualify, proper
women needed to have had their last interval at smallest viable
five years in times gone by and be aged 55 or more, (meaning they
were postmenopausal and had a strength expectancy of greater than
five years). From an comparison of 2,421 women in the clinic, the
researchers found 1,471 who agreed to lend a paw out and were
suitable.

The women were sloppily allocated to one of two status. In the
trial group, the women received 1gram (0.03oz) of elemental
calcium daytime by day. This was taken through two tablets of
calcium citrate before breakfast and three in the evening. The
lead group received the same epitome tablets (placebo). The
research was twin blind and neither the patients nor the
researchers know who had been allocated to which group. The women
were trace up both six months for five years.

The researchers looked for adverse cardiovascular whereabouts
such as heart attack, stroke (of all types) angina and passing
and consequently analysed the data in three ways. Potentially
adverse events that were reported by the women themselves were
analysed initial. The researchers then checked the medical
collection at the women’s sick room and nearest and dearest
doctors for emergency of the thing.

Finally, a poke about of the national database of hospital
admission was carried out to identify any events that were
unreported by the women.

The researchers previously individual total standard definition
of heart barrage and stroke to set down the adverse events.

What were the results of the study?

The two groups had equivalent characteristics to all other at the
instigate of the study. The groups border flash age was 74.2 draw
a parallel to 74.3 years and average weightiness was 66.8
compared to 67 Kg.

Less than a quarter of each group smoke.

Over five years of prolongation, 45 heart attacks were
self-reported by 31 women in the group taking calcium compared to
19 heart attacks reported by 14 women in the control group. When
checking the records at the hospital and GP surgeries the
researchers were competent to verify a lesser amount of events,
24 events in 21 women taking calcium compared to 10 events in 10
women taking placebo. In both these analyses, this was a
statistically of great size doubling of risk. When the unreported
events were added from the national database the growth in risk
decrease and did not realize statistical implication.

What evaluation did the researchers snatch towards you from these
results?

The researchers conclude, “Calcium supplementation in healthy
postmenopausal women is associated with upward trend in
cardiovascular event rates. This potentially unhygienic effect
should be hovering against the apparent benefits of calcium on
bone.” They acknowledge that quite a few of their findings were
not significant (they show a trend).

The authors also compare the results from this trial to their
previous trial and report the NNT (Number Needed to Treat). This
is an ballpark cipher of patients who constraint to be treat to
explanation or impede one adverse outcome). In this baggage, the
numeral of women needed to be given calcium supplements for five
years to cause one adverse event.

What do the NHS Knowledge Service type of this study?

This was a well-conducted randomised controlled trial, where the
two groups of women were economically balanced at the start of
the study in lexis of risk factor for heart disease and stroke.

This increase expectation that the effect demonstrated was not
simply in the red to difference in overall healthiness between
the two groups.

- The certainty that the women were recruited from the community
to some dimension than from self within at clinic, make it more
likely that these results be applicable to a broader reach of
standard healthy women. However, as the authors acknowledge, the
women were across the world white and 10% of them were effect 80
years ancient, as a consequence the findings may not necessarily
apply to other ages or ethnicities.

- In deep-seated, roll past its sell-by date should be used when
interpret the results of secondary analyses resembling this one.
However, this study watchfully defined its intentions and
collected data before the results were specified, and this
minimises the risk that the results are intolerant.

- The numbers recruited to this study were reflection to do to
detect an effect on bone density and fracture
rate. However, by outer peapod at other consequence such as heart
disease, the authors have found the study had a minimal opening,
because of the number of women recruited, of correctly detect a
solid variance. The fact that their study was thus petite may
narrative for the fact that so few of their results were
statistically significant.

- The authors compared the results from this trial to the results
of their previous trial conducted in reproduce women and found
the balance between risk and benefit to be lock. They estimated
that, over a five-year period, 44 women would need to steal
calcium to cause one myocardial infarction, 56 women to cause one
stroke, and 29 to cause one cardiovascular event. By comparison,
50 women would need to take calcium to prevent one suggestive
fracture. These ballpark figure of benefit and harm are
completely similar suggesting that savour is inescapable by women
and their clinicians when decide whether to take or prescribe
calcium.

This study indicate that planned research wishes to scan
cardiovascular events in connection with taking calcium
supplements. Combining the results of universal trial in a
perfect study would also be long-suffering. This study offer
there is a fine balance between benefit and harm through taking
calcium supplements. However, people taking these supplements
should seek advice from their doctor before changing their
calcium intake.

Links to the headline Calcium pills ‘raise heart risk’. BBC News,
January 16 2008 Calcium tablets ‘raise risk of heart attacks’.
The Daily Telegraph, January 16 2008 Calcium pills for robustly
physical type bones may double the risk of a heart attack. The
Times, January 16 2008 Doctors unease calcium supplements may
lift up the risk of a heart attack. Daily Mail, January 16 2008
Links to the science Bolland MJ, Barber PA, Doughty RN, et al.
Vascular events in healthy elder women unloading calcium
supplementation: randomised controlled trial. BMJ 2008; Jan 15
This communication come from NHS Choices

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