The way the factors like heat, alcohol and medication have affected the couple’s cardiovascular systems, nervous systems, kidneys and endocrine systems has been dealt with in order to shed light on the reason behind the deaths. The way the different factors interact with each other and impact the human physiology, has been used to find out the cause of death.
After considering the different evidences and the medical reports, it can be understood that the alcohol, the hot water and the lasix are the three probable elements that have caused the deaths. Now, the only things common about these three elements are their influences on the human physiology. Furosemide or lasix is a loop diuretic used for treating heart issues, excess tension and other issues. Along with many other diuretics, furosemide is included in the list of banned substances of the World Anti-Doping Agency, because it can mask the presence of other substances in the body. Like other loop diuretics, furosemide deals with exchanging of ions. It reduces the water content of the body. These tallies with the maid’s observation that Mr. Underhill used to complain that he needed to use the bathroom frequently since his last visit to the GP. This drug results in lowering of blood pressure and dehydration. Hot water leads to the temperature of the body getting increased beyond the normal. The human body has a homeostatic system that helps it adapt to the changes in temperature. For example, if the temperature increases, the blood pressure decreases in order to make adjustments. Similarly, blood pressure increases with fall in temperature.